IPAC2016 - List of Keywords (lattice)

Paper	Title	Other Keywords	Page
MOYAA01	Commissioning of the MAX IV Light Source	storage-ring, emittance, injection, vacuum	11
	M. Eriksson, E. Al-Dmour, Å. Andersson, M.A.G. Johansson, S.C. Leemann, L. Malmgren, P.F. Tavares, S. Thorin MAX IV Laboratory, Lund University, Lund, Sweden
	This presentation reports on the beam commissioning status of MAX IV, experience gained and lessons learned, as well as future plans.
	Slides MOYAA01 [6.682 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOYAA01
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MOZA02	Design and Optimization Strategies of Nonlinear Dynamics in Diffraction-limited Synchrotron Light Sources	sextupole, optics, emittance, resonance	33
	R. Bartolini DLS, Oxfordshire, United Kingdom R. Bartolini JAI, Oxford, United Kingdom
	This talk introduces the most recent achievements in the control of nonlinear dynamics in electron synchrotron light sources, with special attention to diffraction limited storage rings. Guidelines for the design and optimization of the magnetic lattice are reviewed and discussed.
	Slides MOZA02 [4.952 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOZA02
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MOOCB02	A Lattice Correction Approach through Betatron Phase Advance	sextupole, simulation, dynamic-aperture, betatron	62
	W. Guo, S.L. Kramer, F.J. Willeke, X. Yang, L. Yu BNL, Upton, Long Island, New York, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy Most lattice correction algorithms, such as LOCO, rely on the amplitude of the BPM signals. However, these signals are a mixture of the BPM gain and beta-beat. Even though BPM gain can be fitted by analyzing the statistics of all the BPMs in a ring accelerator, we found the uncertainty is on the order of a few percent. On the other hand, the betatron phase advance, which is obtained from the correlation of two adjacent BPMs, is independent of the BPM gain and tilt error. It was found at NSLS-II that the measurement precision of the phase advance is typically 0.001 radian, which corresponds to about 0.2% of beta beat. The phase error can be corrected similarly using a response matrix, and at NSLS-II the phase error can be corrected to <0.005 radian (p-p) in less than half an hour. The same technique can be applied to the nonlinear lattice. By comparing the phase advance differences between the on- and off- orbit lattices, the sextupole strength error can be identified. Simulation and experimental results will be demonstrated in the paper.
	Slides MOOCB02 [1.554 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOOCB02
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MOPMB052	On-axis Injection using a Sin Wave RF Kicker	kicker, injection, storage-ring, emittance	211
	B.C. Jiang, Y.B. Leng, S.Q. Tian, L.Y. Yu, M.Z. Zhang, Q.L. Zhang, Z.T. Zhao SINAP, Shanghai, People's Republic of China
	On-axis injection is one of the critical issues for an ul-tra-low emittance storage ring which holds a rather small dynamic aperture. In order to reduce the challenges of the fast pulsed kicker design, a sin wave RF kicker is studied which is suitable for longitudinal on-axis injection. Since the injected bunch is longitudinally apart from the stored bunches, the location of the stored bunches can be at the π knot of the sin wave, while the injected bunches are launched at a phase around π/2+n·π. At this situation the injected bunches will receive a transverse kick, however the store bunches are almost un-affected.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMB052
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MOPMW017	Performance of the Beam Position Monitor System in Solaris Synchrotron	storage-ring, synchrotron, quadrupole, monitoring	432
	A. Kisiel, L.J. Dudek, P.P. Goryl, W.T. Kitka, M.P. Kopec, A.I. Wawrzyniak, L. Żytniak Solaris, Kraków, Poland
	The Beam Position Monitor (BPM) system in the Solaris National Synchrotron Radiation Centre consists of 8 striplines along a linear accelerator and a transfer line and 36 buttons around the storage ring. The beam position measurement in the linac is handled by 15 cm quarter wave directional striplines connected to Libera Single Pass E modules as readout devices. The circulating beam in the storage ring is monitored by set of 45 degree diagonal buttons in two geometries connected to Libera Brilliance⁺ devices. Properly configured BPM setup allows for direct measurement of the beam position stability, closed orbit, current of single train and the stored beam. Moreover, the slow acquisition and turn-by-turn data stream from BPMs in the storage ring are used for automatic orbit correction, computing beam lifetime on each button, measuring an orbit response, the beta function and other physical parameters of the electron beam. In order to improve the measurement reliability the beam based alignment has been performed. Within the presentation the performance of the BPM system in Solaris during commissioning phase will be discussed.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMW017
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MOPOR007	Local Impedance Measurements at ALBA from Turn-by-Turn Acquisition	impedance, insertion, vacuum, optics	598
	M. Carlà, G. Benedetti, T.F.G. Günzel, U. Iriso, Z. Martí ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
	A transverse impedance source manifests itself, among other ways, by producing a small defocusing kick which depends on the beam bunch charge. By repeating optics measurements for different bunch charges, it is possible to disentangle the contribution produced by each impedance source from the dominating focusing effects given by the machine optics. But hunting for such faint defocusing effects poses strong requirements on the precision and sensibility of the measurements, and slow machine drifts or different thermal conditions shall be avoided. In this report, we present a novel method to assess in a fast and precise manner machine optics for different bunch charges using BPM turn-by-turn data and hybrid filling patterns. Finally, measurements for different ALBA machine components like scrapers and In-vacuum undulators are compared with simulation results.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOR007
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MOPOR019	Beta Function Measurement and Resonances Induced by Space Charge Force and Lattice Magnets	resonance, space-charge, emittance, simulation	641
	K. Ohmi, K.G. Sonnad KEK, Ibaraki, Japan
	J-PARC MR has been operated at tune (ν_x,ν_y)=(22.40,20.75). A new operating point around (21.4,21.4) has been proposed by simulation studies on space charge effect since 2013. Machine experiments at the operating point has been performed since 2014 and many encouraging results are being obtained. We discuss why new operating point is better than present one from view point of space charge effects.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOR019
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MOPOR024	Evolution of High Intensity Beams in the CERN PS Booster after H⁻ Injection and Phase Space Painting	emittance, injection, space-charge, booster	656
	M. Cieslak-Kowalska, J.L. Abelleira, E. Benedetto, C. Bracco CERN, Geneva, Switzerland
	With the LHC Injector Upgrade (LIU) project, the injection energy of PS Booster (PSB) ' first circular accelerator in the LHC injector chain ' will be raised from 50 MeV to 160 MeV and the present multiturn injection will be upgraded to H⁻ injection with transverse and longitudinal painting. In the scope of this project, it is planned to double the beam intensities, profiting from the fact that the βγ2 factor will be two times larger (0.35 at 50 MeV and 0.71 at 160 MeV), so the resulting tune spread driven by a direct space charge should remain similar. This paper describes the feasibility to double the intensity of high intensity and large emittance beams, looking into the evolution under space charge and taking into account losses constrains in the ring and in the extraction lines.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOR024
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MOPOW045	Measurement of Advanced Dispersion-based Beam-tilt Correction	electron, FEL, photon, laser	813
	M.W. Guetg, F.-J. Decker, Y. Ding, P. Emma, Z. Huang, T.J. Maxwell SLAC, Menlo Park, California, USA
	Funding: DOE contract \#DE-AC02-76SF00515 Free electron lasers in the X-ray regime require a good slice alignment along the electron bunch to achieve their best performance. A transverse beam slice shift reduces this alignment and spoils projected emittance and optics matching. Coherent synchrotron radiation, specifically for over-compression going through full compression, and transverse wakefields are major contributors to this. In the case of the large-bandwidth operation, with a strong energy chirp on the bunch, this misalignments furthermore reduce the spectral bandwidth of the FEL pulse. Well-defined manipulation of dispersion allows to compensate for this slice centroid shifts, therefore enhancing lasing power and in case of the large bandwidth mode, spectral bandwidth. This work shows the first application of this correction on an X-ray FEL resulting in increase in beam-power and bandwidth.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOW045
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MOPOW046	RadiaBeam/SLAC Dechirper as a Passive Deflector	wakefield, electron, focusing, diagnostics	817
	A. Novokhatski, A. Brachmann, M. Dal Forno, V.A. Dolgashev, A.S. Fisher, M.W. Guetg, Z. Huang, R.H. Iverson, P. Krejcik, A.A. Lutman, T.J. Maxwell SLAC, Menlo Park, California, USA J. Zemella DESY, Hamburg, Germany
	Funding: This work was supported by Department of Energy Contract No. DE-AC02-76SF00515. We discuss the possibility of using the RadiBeam/SLAC dechirper recently installed at LCLS for measuring the bunch length of very short bunches, less than 1 fs perhaps as short as 100 atto second. When a bunch travels close to one of the jaws the particles of the bunch get a transverse kick depends upon the position of a particle in a bunch. The tail particles get more kick. The transverse force also gets a nonlinear dependence on the transverse position. The stretched bunch can be measured at the YAG screen that is 100 m downstream the dechirper. The most important aspect of this measurement is that that no synchronization is needed. The Green's function for the transverse kick was evaluated based on the precise wake field calculations of the dechirper corrugated structure. Using this function we can restore the longitudinal shape of the bunch. This may also help to see if a bunch has any micro-bunch structure. A. Noovokhatski "Wakefield potentials of corrugated structures",Phys. Rev. ST Accel. Beams 18, 104402 (2015)
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOW046
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MOPOW050	Study of Lower Horizontal Emittance Optics in the Present Soleil Storage Ring	emittance, quadrupole, optics, dynamic-aperture	827
	H.C. Chao, P. Brunelle, A. Nadji, L.S. Nadolski, R. Nagaoka SOLEIL, Gif-sur-Yvette, France
	With the aim of delivering a lower horizontal emittance beam to the users of the present SOLEIL ring, a systematic lattice study is carried out. The goal is to discover feasible optics solutions having the horizontal emittance notably lower than the present value of 3.9 nm rad, while fulfilling all the physical requirements and without changing the current magnet structure in the lattice. The strategy adopted is a cell-wise optimization of the linear lattices in the two types of double-bend cells that constitute the SOLEIL ring. In the second step they are concatenated via finer matching. A global scan of the 5 quadrupole families for the search of stable solutions is performed. The statistical properties are given. One can easily select possible solutions without matching. For the second type of cell having 10 quadrupole families, another scan of quadrupoles and a matching using a quadrupole triplet are applied for linear optics characteristics. Finally, the nonlinear optimization is performed with modern nonlinear optimization algorithms.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOW050
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MOPOY002	Towards Beam-Dynamics Simulations Including More Realistic Field Descriptions for the HESR	multipole, dynamic-aperture, quadrupole, dipole	847
	J.H. Hetzel, U. Bechstedt, J. Böker, A. Lehrach, B. Lorentz, R. Tölle FZJ, Jülich, Germany
	The High Energy Storage Ring (HESR) is part of the upcoming Facility for Antiproton and Ion Research (FAIR) placed in Darmstadt (Germany). The HESR is designed for antiprotons with a momentum range from 1.5 GeV/c to 15 GeV/c, but will as well be suitable to provide heavy ion beams with a momentum range from approximately 0.6 GeV/c to 5.8 GeV/c. To guarantee smooth operation it is crucial to verify and improve the design with beam-dynamics simulations. Particularly the dynamic aperture is calculated as a measure of quality. Complementary to previous beam dynamics calculations based on frequency map analysis, the dynamic aperture is calculated using a variant of the Lyapunov exponent. The first bending and focusing magnets have been delivered and the magnetic fields measured recently. So the modeled assumptions regarding the multipole imperfections of these elements are now replaced by values based on measurements. This contribution contains the inclusion of the measured values as well as the the tracking-based dynamic aperture calculations. D.M. Welsch, A. Lehrach, B. Lorentz, R.Maier, D. Prasuhn, R.Tölle: "Investigation and Optimization of Transverse Non-Linear Beam Dynamics in the High-Energy Storage Ring HESR"; IPAC'10
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOY002
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MOPOY032	Beam Twiss Measurement With Ws Including Space Charge Effect	experiment, space-charge, simulation, rfq	925
	Y.L. Zhao, H. Geng, C. Meng, F. Yan IHEP, Beijing, People's Republic of China
	Wire Scanners (WS) are used to measure beam profile and calculate the transverse Twiss parameters at the entrance of MEBT1 in the CADS injector I test stand. As to data process, the traditional method with transfer map doesn't consider the space charge effect. But, as we know, space charge effect can't be neglected for high intensity accelerators. In this paper, optimization algorithm is used in beam emittance measurement.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOY032
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TUYA01	BEPCII Performance and Beam Dynamics Studies on Luminosity	luminosity, radiation, synchrotron, synchrotron-radiation	1014
	C.H. Yu, Z. Duan, S. Gu, Y.Y. Guo, X.Y. Huang, D. Ji, H.F. Ji, Y. Jiao, Zh.C. Liu, Y.M. Peng, Q. Qin, Y.S. Sun, S.K. Tian, J.Q. Wang, N. Wang, X.H. Wang, Y. Wei, X.M. Wen, J. Wu, J. Xing, G. Xu, Y. Yue, C. Zhang, Y. Zhang IHEP, Beijing, People's Republic of China
	The upgrade of the Beijing Electron Positron Collider, BEPCII, is now in a good performance for both high energy physics and synchrotron radiation experiments. The luminosity at the design energy of 1.89 GeV reached the design value 1.0*10³³/cm²/s¹ recently. A lot of work, including accelerator physics study and technical progress, has been done for the luminosity enhancement, not only at the design energy, but all the energy region run for HEP experiments from 1.0 to 2.3 GeV. The performance of BEPCII and the process of luminosity enhancement will be described in detail.
	Slides TUYA01 [5.801 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUYA01
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TUOBA03	Application of Differential Evolution Algorithm in Future Collider Optimization	dynamic-aperture, sextupole, collider, emittance	1025
	Y. Zhang IHEP, Beijing, People's Republic of China D. Zhou KEK, Ibaraki, Japan
	Funding: Project U1332108 supported by NSFC. The dynamic aperture of is very limited due to the very small beta at IP in the SuperKEKB. In the storage ring based Higgs factory, the vertical beta function is not so small, but the much larger circumference enlarge the detuning term especially in horizontal direction. It is very hard to optimize the dynamic aperture in the future colliders. The particle loss may comes from different cause for different energy or different transverse coupling. The design of CEPC is still in process. The construction of SuperKEKB is nearly finished, but there still exist some problem which could reduce the performance. There are a few hundred parameters to be varied in the future colliders. The global optimization may be a good way to enlarge the dynamic aperture. Differential Evolution is a very simple population based, stochastic function minimizer which is very powerful at the same time. In this paper we show some application of the algorithm in the two machines. It has the potential to help us optimize the machine.
	Slides TUOBA03 [2.289 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUOBA03
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TUOAB02	Conditions for CSR Microbunching Gain Suppression	dipole, emittance, synchrotron, synchrotron-radiation	1057
	C.-Y. Tsai Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA S. Di Mitri Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy D. Douglas, R. Li, C. Tennant JLab, Newport News, Virginia, USA
	Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177. The coherent synchrotron radiation (CSR) of a high brightness electron beam traversing a series of dipoles, such as transport arcs, may result in phase space degradation. On one hand, the CSR can perturb electron transverse motion in dispersive regions along the beamline, causing emittance growth. On the other hand, the CSR effect on the longitudinal beam dynamics could result in microbunching gain enhancement. For transport arcs, several schemes have been proposed* to suppress the CSR-induced emittance growth. Similarly, several scenarios have been introduced** to suppress CSR-induced microbunching gain, which however mostly aim for linac-based machines. In this paper we try to provide sufficient conditions for suppression of CSR-induced microbunching gain along a transport arc, analogous to. Several example lattices are presented, with the relevant microbunching analyses carried out by our semi-analytical Vlasov solver*. The simulation results show that lattices satisfying the proposed conditions indeed have microbunching gain suppressed. We expect this analysis can shed light on lattice design approach that could suppress the CSR-induced microbunching gain. D.Douglas et al, JLAB-ACP-14-1751, S.DiMitri et al, PRL (2013), R.Hajima, NIMA (2004), Y.Jiao et al, PRSTAB (2014) Z.Huang et al, PRSTAB (2004), Saldin et al, NIMA (2004) *C.Tsai et al, FEL'15
	Slides TUOAB02 [6.484 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUOAB02
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TUPMB017	The Injection Septum Magnet for the Collector Ring (FAIR)	injection, septum, vacuum, operation	1145
	P.Yu. Shatunov, D.E. Berkaev, I. Koop, E.P. Semenov, D.B. Shwartz BINP SB RAS, Novosibirsk, Russia A. Dolinskyy, S.A. Litvinov GSI, Darmstadt, Germany Yu. A. Rogovsky Budker INP & NSU, Novosibirsk, Russia
	Collector Ring is one of the key installations of the FAIR project (Darmstadt, Germany). It is dedicated for stochastic cooling of incoming beams of antiprotons and rare ions. Additionally there is a mode of operation for experiments in the ring. Beams for all modes of operation are injected through one transfer channel. Extremely high acceptance of the ring (240 mm*mrad) leads to large apertures of all magnetic elements including the septum magnet. Meanwhile planned parameters of the magnetic field and magnetic field quality are comparatively strict. The present state of the design of the pulsed injection septum for the CR is presented in this article together with the concept of the injection system.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMB017
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TUPMB021	SLAC FACET-II Positron Damping Ring Magnet Design	positron, damping, dipole, magnet-design	1154
	M.A.G. Johansson MAX IV Laboratory, Lund University, Lund, Sweden Y. Cai, V. Yakimenko SLAC, Menlo Park, California, USA
	The FACET-II facility, currently being designed at SLAC, will contain a small ~20 m circumference, 335 MeV, positron damping ring. The ring has to fit in the existing linac tunnel, meaning that a compact lattice with short distances between magnets is required. The detailed magnet design is done in Opera-3d, with a finite element model of a full damping ring arc being simulated. This article presents this magnet design in a relatively early stage, with iteration between magnet and lattice design currently in progress.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMB021
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TUPMB023	MAX IV 3 GeV Storage Ring Magnet Block Production Series Measurement Results	storage-ring, dipole, octupole, synchrotron	1157
	M.A.G. Johansson, L.-J. Lindgren, M. Sjöström, P.F. Tavares MAX IV Laboratory, Lund University, Lund, Sweden
	The MAX IV 3 GeV storage ring magnets are integrated "magnet block" units consisting of several consecutive magnet elements precision-machined out of a common solid iron block. In the 3 GeV ring, there are 140 magnet blocks containing a total of 1320 magnet elements. During the manufacturing phase of the project, a field measurement was performed for each magnet element, by Hall probe and/or by rotating coil. This article presents an overview of the magnetic field measurement results that were obtained for the full production series.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMB023
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TUPMB025	Conceptual Design of Storage Ring Magnets for a Diffraction Limited Light Source Upgrade of ALS, ALS-U	dipole, sextupole, quadrupole, magnet-design	1161
	C.A. Swenson, D. Arbelaez, J.-Y. Jung, J.R. Osborn, S. Prestemon, D. Robin, D. Schlueter, C. Steier, C. Sun, E.J. Wallén LBNL, Berkeley, California, USA
	Funding: The Advanced Light Source is supported by the Director, Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. Lawrence Berkeley National Laboratory (LBNL) has been engaged in an internal laboratory directed research and development project to define a suitable accelerator physics lattice to support the diffraction limited upgrade of the Advanced Light Source. Diffraction limited lattices require strong focusing elements throughout. Magnetics design is challenging in that the high gradient magnetic structures are required to operate in close proximity. Lattice development requires a coordinated engineering design effort to ensure the lattice design feasibility. We will present a review of the results of our magnet scoping studies as well as conceptual design specifications for the ALS-U lattice dipole, quadrupole, and sextupole magnet systems. Additionally we will present a conceptual design of refined super-bend magnets for the ALS-U lattice including a discussion of their potential impact on beam emittance. C. Steier, et al. Progress of the R&D towards a Diffraction Limited Upgrade of the Advanced Light Source, Proceedings of IPAC 2015,
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMB025
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TUPMW001	SPPC Parameter Choice and Lattice Design	dipole, collider, proton, quadrupole	1400
	F. Su Institute of High Energy Physics (IHEP), People's Republic of China S. Bai, T.J. Bian, Y.K. Chen, J. Gao, J.Y. Tang, D. Wang, Y. Wang IHEP, Beijing, People's Republic of China
	In this paper we showed a systematic method of appropriate parameter choice for a circular pp collider by using analytical expression of beam-beam tune shift limit started from given design goal and technical limitations. Based on parameters scan, we obtain a set of parameters for SPPC with different circumferences like 54km, 78km or 100km and different energies like 70TeV or 100TeV. We also showed the first version of SPPC lattice although it needs lots of work to do and to be optimized.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMW001
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TUPMW022	Modelling and Measurements of Bunch Profiles at the LHC Flat Bottom	emittance, scattering, radiation, damping	1477
	S. Papadopoulou, F. Antoniou, J.E. Muller, Y. Papaphilippou, G. Trad CERN, Geneva, Switzerland
	At the LHC flat bottom the interplay between a series of effects (i.e. intrabeam scattering, longitudinal beam manipulations, non-linearities of the machine, etc) can lead to a population of the tails of the beam distributions, which may become non-Gaussian. This paper presents observations of the evolution of particle distributions in the LHC flat bottom. Novel distribution functions are employed to represent the beam profiles, and used as a guideline for generalising emittance growth rate estimations due to IBS. Finally, an attempt is made to benchmark an IBS Monte-Carlo simulation code, able to track 3D particle distributions, with the measured beam profile evolutions.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMW022
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TUPMW029	Tune and Chromaticity Control During Snapback and Ramp in 2015 LHC Operation	injection, controls, sextupole, dipole	1501
	M. Schaumann, M. Juchno, M. Lamont, M. Solfaroli Camillocci, E. Todesco, J. Wenninger CERN, Geneva, Switzerland
	Because of current redistribution on the superconducting cables, the harmonic components of the magnetic fields of the superconducting magnets in the Large Hadron Collider (LHC) show decay during the low field injection plateau. This results in tune and chromaticity variations for the beams. In the first few seconds of the ramp the original hysteresis state of the magnetic field is restored - the field snaps back. These fast dynamic field changes lead to strong tune and chromaticity excursions that, if not properly controlled, induce beam losses and potentially trigger a beam dump. A feed-forward system applies predicted corrections during the injection plateau and to the first part of the ramp to avoid violent changes of beam conditions. This paper discusses the snapback of tune and chromaticity as observed in 2015, as well as the control of beam parameters during the ramp. It also evaluates the quality of the applied feed-forward corrections and their reproducibility.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMW029
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TUPMW040	Beam-beam Simulation for the 2015 RHIC Proton Run with Electron Lenses	proton, dynamic-aperture, electron, simulation	1533
	Y. Luo, W. Fischer, X. Gu, G. Robert-Demolaize, V. Schoefer BNL, Upton, Long Island, New York, USA S.M. White ESRF, Grenoble, France
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. Electron lenses were used for head-on beam-beam compensation for the first time in the 2015 Relativistic Heavy Ion Collider (RHIC) 100~GeV polarized proton run. Lattices with the achromatic telescopic squeeze (ATS) scheme of β^* are adopted to improve the off-momentum dynamic aperture. The phase advances between the electron lenses to one of the two collisional points are set to kπ to minimize the beam-beam resonance driving terms. In this article, we present the results from weak-strong and strong-strong beam-beam simulations with head-on beam-beam compensations for these lattices. Simulations are also carried out aiming to explain the observations from operation.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMW040
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TUPMY004	The MICE Demonstration of Muon Ionization Cooling	emittance, betatron, simulation, experiment	1547
	J.-B. Lagrange, C. Hunt, J. Pasternak Imperial College of Science and Technology, Department of Physics, London, United Kingdom V.C. Palladino INFN-Napoli, Napoli, Italy J. Pasternak STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
	Funding: STFC, DOE, NSF, INFN, CHIPP AND MORE Muon beams of low emittance provide the basis for the intense, well-characterised neutrino beams necessary to elucidate the physics of flavour at the Neutrino Factory and to provide lepton-antilepton collisions up to several TeV at the Muon Collider. The international Muon Ionization Cooling Experiment (MICE) will demonstrate muon ionization cooling, the technique proposed to reduce the phase-space volume occupied by the muon beam at such facilities. In an ionization-cooling channel, the muon beam traverses a material (the absorber) loosing energy, which is replaced using RF cavities. The combined effect is to reduce the transverse emittance of the beam (transverse cooling). The configuration of MICE required to deliver the demonstration of ionization cooling is being prepared in parallel to the execution of a programme designed to measure the cooling properties of liquid-hydrogen and lithium hydride. The design of the cooling-demonstration experiment will be presented together with a summary of the performance of each of its components and the cooling performance of the experiment. Submitted by the MICE speakers bureau that will identify later a member of the collaboration to present the contribution
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMY004
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TUPMY006	MICE Step IV Optics without the M1 Coil in SSD	emittance, solenoid, simulation, scattering	1553
	A. Liu Fermilab, Batavia, Illinois, USA
	Funding: Fermi National Accelerator Laboratory The international Muon Ionization Cooling Experiment (MICE) will demonstrate ionization cooling, the only technique that, given the short muon lifetime, can reduce the phase-space volume occupied by a muon beam quickly enough. MICE will demonstrate cooling in two steps. In the first one, Step IV, MICE will study the multiple Coulomb scattering in liquid hydrogen (LH2) and lithium hydride (LiH). A focus coil module will provide focussing on the absorber. The transverse emittance will be measured upstream and downstream of the absorber in two spectrometer solenoids (SS). Magnetic fields generated by two match coils in the SSs allow the beam to be matched into a flat-field regions in which the tracking detectors are installed. An incident in September 2015 rendered matching coil \#1 (M1D) of the downstream spectrometer inoperable. A new Step IV lattice without M1D and its optimization via a Genetic Algorithm (GA) will be described in this paper.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMY006
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TUPMY011	Simulated Measurements of Cooling in Muon Ionization Cooling Experiment	emittance, solenoid, detector, electron	1565
	T.A. Mohayai IIT, Chicago, Illinois, USA C.T. Rogers STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom P. Snopok Fermilab, Batavia, Illinois, USA P. Snopok Illinois Institute of Technology, Chicago, Illlinois, USA
	Cooled muon beams set the basis for the exploration of physics of flavour at a Neutrino Factory and for multi-TeV collisions at a Muon Collider. The international Muon Ionization Cooling Experiment (MICE) measures beam emittance before and after an ionization cooling cell and aims to demonstrate emittance reduction in muon beams. In the current MICE Step IV configuration, the MICE muon beam passes through low-Z absorber material for reducing its transverse emittance through ionization energy loss. Two scintillating fiber tracking detectors, housed in spectrometer solenoid modules upstream and downstream of the absorber are used for reconstructing position and momentum of individual muons for calculating transverse emittance reduction. However, due to existence of non-linear effects in beam optics, transverse emittance growth can be observed. Therefore, it is crucial to develop algorithms that are insensitive to this apparent emittance growth. We describe a different figure of merit for measuring muon cooling which is the direct measurement of the phase space density.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMY011
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TUPMY012	Hybrid Methods for Simulation of Muon Ionization Cooling Channels	simulation, experiment, emittance, scattering	1568
	J.D. Kunz IIT, Chicago, Illinois, USA M. Berz, K. Makino MSU, East Lansing, Michigan, USA P. Snopok Illinois Institute of Technology, Chicago, Illlinois, USA
	Funding: Work is supported by the U.S. Department of Energy. COSY Infinity is an arbitrary-order beam dynamics simulation and analysis code. It can determine high-order transfer maps of combinations of particle optical elements of arbitrary field configurations. New features are being developed for inclusion in COSY to follow the distribution of charged particles through matter. To study in detail some of the properties of muons passing through material, the transfer map approach alone is not sufficient. The interplay of beam optics and atomic processes must be studied by a hybrid transfer map–Monte Carlo approach in which transfer map methods describe the deterministic behavior of the particles in the accelerator channel, and Monte Carlo methods are used to model the stochastic processes intrinsic to liquid and solid absorbers. The advantage of the new approach is that the vast majority of the dynamics is represented by fast application of the high-order transfer map of an entire element and accumulated stochastic effects. The gains in speed are expected to simplify the optimization of muon cooling channels which are usually very computationally demanding. Progress on the development of the required algorithms is reported.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMY012
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TUPMY023	Advanced Gabor Lens Lattice for Laser Driven Hadron Therapy and Other Applications	laser, collimation, ion, cavity	1595
	J.K. Pozimski, M. Aslaninejad, P.A. Posocco Imperial College of Science and Technology, Department of Physics, London, United Kingdom
	Funding: Funding was provided by the Imperial Confidence in Concept scheme. The application of laser accelerated ion beams in hadron therapy requires a beam optics with unique features. Due to the spectral and spatial distribution of laser accelerated protons a compact ion optical system with therapy applications, based on Gabor space charge lenses for collecting, focusing and energy filtering the laser produced proton beam, has significant advantages compared with other setups. While a passive momentum selection could improve already the usability of laser driven hadron, we show that an advanced lattice utilizing additional RF cavities not only will deliver a momentum spread smaller than conventional accelerators, but also will increases the dose delivered. Furthermore, a possible near term application in the field of radio nuclide production is presented.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMY023
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TUPOR033	Experimental Study of Single Bunch Instabilities at NSLS-II Storage Ring	synchrotron, feedback, storage-ring, betatron	1738
	W.X. Cheng, B. Bacha, G. Bassi, A. Blednykh, B. Podobedov, O. Singh, V. Smalyuk BNL, Upton, Long Island, New York, USA
	Single bunch instabilities have been observed since the early stage of NSLS-II storage ring commissioning. After installing the super-conducting cavity, the single bunch instability threshold current was similar at 0.7mA. The instability was eventually determined to be due to transverse mode coupling. Microwave instability has been characterized using streak camera bunch profile, horizontal beam sizes at dispersion location and beam spectrums. Microwave instability threshold current dependency on bunch lengths and IUV gaps has been studied. Most recent experimental results will be presented in this paper.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPOR033
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TUPOY036	Diffusion and Thermal Stability of Implanted Hydrogen in ZnO Nanorods	proton, resonance, ion, radiation	1982
	J.K. Park, Y.-S. Cho, H.-J. Kwon, K.T. Seol, S.P. Yun Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea
	Funding: This work has been supported through KOMAC operation fund of KAERI by Ministry of Science ICT and Future Planning of Korean Government. The 20-MeV proton-beams with a fluence of 10¹² cm^-2 were irradiated on ZnO nanorods. The effects of proton-beam irradiation on ZnO nanorods are investigated by using ¹H nuclear magnetic resonance (NMR) spectroscopy. After irradiation, new and modified NMR resonance lines are observed in ¹H NMR spectra. The diffusion and thermal stability of each proton species are investigated from the lab- and rotating-frame spin-lattice relaxation data depending on temperature. Understanding the properties of thermally stable hydrogen species created by the beam irradiation may promise many possible applications, since the hydrogen stable up to high temperature only meets the device working conditions.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPOY036
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WEXA01	The ESRF Low-emittance Upgrade	emittance, dipole, vacuum, radiation	2023
	P. Raimondi ESRF, Grenoble, France
	This talk focuses on novel aspects of the lattice design, describes the technical solutions that have been found for meeting the design goals (including the use of permanent magnet dipoles), outlines the main challenges that will be faced in commissioning and operating the new lattice in a very demanding parameter regime, and discusses how it is hoped to maximize eventual benefits for users while minimizing disruption during the upgrade process.
	Slides WEXA01 [23.005 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEXA01
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WEOAA02	On-axis Beam Accumulation Enabled by Phase Adjustment of a Double-frequency RF System for Diffraction-limited Storage Rings	injection, kicker, synchrotron, storage-ring	2032
	G. Xu, J. Chen, Z. Duan, J. Qiu IHEP, Beijing, People's Republic of China
	Funding: Work supported by NSFC (Y4113G005C) Future synchrotron light sources aim to achieve ultra- low emittances on both transverse planes, approaching or even reaching the diffraction limit of X-ray photon energies. These diffraction-limited storage rings (DLSRs) feature very strong lattice nonlinearities and thus very small dynamic aperture, which exclude off-axis injection schemes. In this paper, we propose a longitudinal on-axis injection scheme, which is based on a double-frequency RF system and in- dependently adjustment of the RF phase of each cavity to enable RF gymnastics. Such a scheme looks feasible with the state-of-art technology of fast injection kicker. Compari- son with other on-axis injection schemes is also discussed.
	Slides WEOAA02 [1.712 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEOAA02
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WEPMB056	CVD Deposition of Nb Based Materials for SRF Cavities	niobium, SRF, superconductivity, accelerating-gradient	2241
	P. Pizzol, P. Chalker, T. Heil The University of Liverpool, Liverpool, United Kingdom O.B. Malyshev, S.M. Pattalwar, R. Valizadeh STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom G.B.G. Stenning STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
	Bulk niobium cavities are widely employed in particle accelerators to create high accelerating gradient despite their high material and operation cost. Advancements in technology have taken bulk niobium close to its theoretical operational limits, pushing the research to explore novel materials, such as niobium based alloys. Nitrides of niobium offer such an alternative, exhibiting a higher Tc compared to bulk niobium. Replacing then the niobium with a material with better thermal conductivity, such as copper, coated with thin films of nitrides in a multilayer S-I-S would lead to improved performance at reduced cost. Physical vapour deposition (PVD) is currently used to produce these coatings, but it suffers from lack of conformity. This issue can be resolved by using chemical vapour deposition (CVD), which is able to produce high quality coatings over surfaces with a high aspect ratio. This project explores the use of CVD techniques to deposit NbN thin films starting from their chlorinated precursors. The samples obtained are characterized via SEM, FIB, XRD, and EDX.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMB056
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WEPMW025	Optimizing the Design of Linear Non-scaling Fixed Field Alternating Gradient Arcs for the Electron Rings of eRHIC	radiation, synchrotron, synchrotron-radiation, electron	2475
	J.S. Berg BNL, Upton, Long Island, New York, USA
	Funding: This manuscript has been authored by employees of Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy. I describe a process for producing optimal linear non-scaling fixed field alternating gradient (FFAG) arc designs for the electron rings of eRHIC, an electron-ion collider in the RHIC tunnel at Brookhaven National Laboratory. The electrons are accelerated in two FFAG rings (low and high energy), which in addition to the arcs optimized here, contain straight sections, splitter/combiner sections, and a linac shared between the rings. The optimization process I use has two layers, an inner one meeting constraints and an outer optimization that minimizes a target function. The target function is an approximation to the FFAG arc cost, for which I give the function used and the basis for that choice. While reducing synchrotron radiation is important, I show that optimizing for synchrotron radiation alone leads to significant cost an performance penalties for the rest of the machine design for very little reduction in synchrotron radiation. I describe important constraints on the design, in particular minimum drift lengths, maximum and minimum tunes, and clearance from the beam to the beam pipe. Finally, I present possible eRHIC FFAG parameters resulting from this optimization.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMW025
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WEPMY010	Considerations for a Drive Beam Scheme for a Plasma Wakefield Linear Collider	plasma, collider, kicker, linac	2565
	J. Pfingstner, E. Adli, C.A. Lindstrøm University of Oslo, Oslo, Norway E. Marín, D. Schulte CERN, Geneva, Switzerland
	The potential for high average gradients makes plasma wakefield acceleration (PWFA) an attracting option for future linear colliders. For a beam-driven PWFA collider a sequence of cells has to be supplied with synchronised drive beam bunches. This paper is concerned with the generation, transport and distribution of these drive beam bunches in a so-called drive beam complex for a 3 TeV collider. Based on earlier concepts, several modifications are suggested. The new design includes a superconducting linac and an optimised bunch delay system with a tree structure. To verify the feasibility for the overall complex, a lattice design and tracking studies for the critical bending arc subsystem are presented. Also the feasibility of a compact bunch separation system is shown. The result of these efforts is a drive beam complex that is optimised for construction cost and power efficiency that favours unified lattice solutions.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMY010
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WEPOR011	Lattice Matching with Elegant at ELSA	closed-orbit, dipole, quadrupole, simulation	2690
	J.-P. Thiry, W. Hillert ELSA, Bonn, Germany
	The electron stretcher ring ELSA provides a beam of polarized electrons of up to 3.2 GeV energy. To preserve the initial degree of polarization, several depolarizing resonances have to be compensated during the fast energy ramp of 6 GeV/s. Beam depolarization, caused by crossing these resonances is studied using comprehensive numerical calculations. These depend essentially on a precise model of the actual magnetic field distributions, explicitly taking into account misalignments. Hence it is necessary to match the theoretical lattice to the actual accelerator. In a first step the alignment of all magnets has been examined and improved. This was done by using standard survey equipment and precise electronic spirit levels. In a second step the concept of response matrix fitting is used for further, beam based, lattice matching. Particle tracking and optics calculations are carried out using elegant, a fully 6D accelerator toolbox. Lattice matching is done by repeatedly calling elegant and utilizing a modified Levenberg-Marquardt optimizer. In this contribution we will describe our lattice fitting implementation.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOR011
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WEPOW003	Design Considerations of a 7BA-6BA Lattice for the Future Upgrade of SOLEIL	dipole, emittance, optics, sextupole	2815
	R. Nagaoka, P. Brunelle, H.C. Chao, F.J. Cullinan, X.N. Gavaldà, A. Loulergue, A. Nadji, L.S. Nadolski, M.-A. Tordeux SOLEIL, Gif-sur-Yvette, France
	Previous studies indicated that adoption of a combination of 7 and 6BA cells in the existing SOLEIL ring enables reaching the target range of the horizontal emittance below 200 pm·rad as expected, in contrast to fewer dipole solutions such as a combination of 5 and 4BA studied earlier (IPAC 2014). However, the previous 7BA-6BA lattice resulted in having unacceptably strong gradients in quadrupoles and dipoles leading to high natural chromaticities. Several schemes that would allow for an improvement are explored, such as shortening the insertion device straight sections by one or two meters to create more space for the magnetic structure, lowering the dipole fields and the use of anti-bends as proposed by A. Streun. The effectiveness of each scheme is evaluated and the best combined use of them for SOLEIL is investigated. Ways to fulfil the constraints of the existing dipole beam lines are studied by introducing longitudinal gradient bends and/or multipole wigglers. The nonlinear optimisation to maximise the on and off-momentum apertures is made by using genetic algorithm-based numerical codes. A comparison of their performance and the obtained results are presented.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOW003
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WEPOW005	Updates on Lattice Modeling and Tuning for the ESRF-EBS Lattice.	injection, dipole, quadrupole, radiation	2818
	S.M. Liuzzo, N. Carmignani, J. Chavanne, L. Farvacque, G. Le Bec, B. Nash, P. Raimondi, R. Versteegen, S.M. White ESRF, Grenoble, France
	The ESRF-EBS lattice model is updated to include the effect of magnetic lengths in dipoles, quadrupoles, sextupoles and combined function magnets. The effect of this modification and the updates to the injection cell are considered with particular focus on injection efficiency and Touschek lifetime. The solutions to introduce new sources of radiation suitable for the existing bending magnet radiation beamlines are also presented.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOW005
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WEPOW006	Hybrid Multi Bend Achromat at 3 GeV for Future 4th Generation Light Sources	emittance, sextupole, dynamic-aperture, dipole	2822
	S.M. Liuzzo, D. Einfeld, L. Farvacque, P. Raimondi ESRF, Grenoble, France
	Starting from the Hybrid Multi Bend Achromat (HMBA) lattice designed for the 6GeV ESRF-EBS we rescale the lattice energy to 3GeV and optimize the lattice parameters to achieve dynamic apertures sufficient for injection and lifetimes of more than 7h without errors. The rescaling results to an emittance of roughly 140pmrad. Further optimizations of bending magnets longitudinal gradient, optics and sextupole fields show the possibility to further decrease emittance and increase the DA and lifetime. A comparison with other lattice designs is also presented.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOW006
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WEPOW016	Designing an Ultra Low Emittance Lattices for Iranian Light Source Facility Storage Ring	emittance, storage-ring, vacuum, scattering	2858
	E. Ahmadi, M. Jafarzadeh, J. Rahighi ILSF, Tehran, Iran H. Ghasem IPM, Tehran, Iran S.M. Jazayeri IUST, Narmac, Tehran, Iran
	Electron storage rings are extensively used for high luminosity colliders, damping rings in high-energy physics and synchrotron light sources. To further increase the luminosity at the colliders or brightness of a synchrotron light sources, the beam emittance is being continually pushed downward. In this paper, we investigate the lattice design for the storage ring of Iranian Light Source Facility (ILSF) with an ultra-low emittance, intermediate energy of 3 GeV and circumference of 528 m. We present the design results for a five-band achromat lattice with the natural emittance of 276 pm-rad. The base line is based on 20 straight sections with the length of 7 m.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOW016
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WEPOW020	Present Status of KEK Photon Factory and Future Project	emittance, undulator, storage-ring, operation	2871
	T. Honda, M. Adachi, S. Asaoka, K. Haga, K. Harada, Y. Honda, X.J. Jin, T. Kageyama, R. Kato, Y. Kobayashi, K. Marutsuka, T. Miyajima, H. Miyauchi, S. Nagahashi, N. Nakamura, K.N. Nigorikawa, T. Nogami, T. Obina, M. Ono, T. Ozaki, H. Sagehashi, H. Sakai, S. Sakanaka, H. Sasaki, Y. Sato, M. Shimada, T. Shioya, M. Tadano, T. Tahara, T. Takahashi, R. Takai, H. Takaki, O. Tanaka, Y. Tanimoto, K. Tsuchiya, T. Uchiyama, A. Ueda, K. Umemori, K. Watanabe, M. Yamamoto, N. Yamamoto, Ma. Yoshida, S.I. Yoshimoto KEK, Ibaraki, Japan
	Two synchrotron radiation sources of KEK, the PF-ring and the PF-AR, continue their user operation with various improvements. Scrap and build of the first generation undulators of 1980s at the PF-ring is pushed forward year by year. Five new elliptically polarized undulators have been installed in these five years, and we have also installed four very narrow-gap short-period undulators generating high brilliant X-ray. The new beam transport line that enables the 6.5-GeV full energy injection for PF-AR will be completed by the end of 2016 in order to make the top-up operation of the two SR sources compatible with the continuous injection for two main rings of the Super-KEKB. We have proposed a project of further upgrade of the 2.5-GeV PF-ring to improve its horizontal emittance as 8 nm rad using combined bending magnets at the arc sections. And we are also moving ahead on proposal of constructing a new KEK light source of an extremely low emittance as 0.3 nm rad. The progress and detail of our future project will be described in this paper.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOW020
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WEPOW021	The Low Emittance Reconstruction of the Arc Section of the Photon Factory	emittance, dynamic-aperture, photon, sextupole	2874
	K. Harada, Y. Kobayashi, N. Nakamura, K. Oide, H. Sakai, S. Sakanaka KEK, Ibaraki, Japan
	The present horizontal emittance of the Photon Factory (PF) ring is about 35.4 nmrad. By the reconstruction of the normal cells at the arc section, the emittance can be reduced to about 8 nmrad. The double number of the combined function short bending magnets are adopted and one present normal cell become two new normal cells. Although the lattice of the straight sections are not changed, the optics are optimized to reduce the non-linear effects of the sextupoles of the arc sections. By keeping the tune advance of the straight section as 3 for the horizontal direction and 2.5 for the vertical, the dynamic aperture as large as that of the present ring can be achieved with the magnetic errors. The difference of the optics of the straight sections are so little that the beam injection and the operation of the in-vacuum short-gap undulators can be maintained. The hardware design will be began as the next step for the realization of the plan. In this proceedings, the design, optimization and simulation results for the low emittance lattice are shown.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOW021
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WEPOW025	Exploring the Ultimate Linear and Nonlinear Performance of the HEPS hybrid 7BA design	emittance, sextupole, storage-ring, optics	2883
	Y. Jiao, G. Xu IHEP, Beijing, People's Republic of China
	The High Energy Photon Source (HEPS), a kilometre- scale diffraction-limited storage ring (DLSR) light source, with a beam energy of 5 to 6 GeV and transverse emittances of a few tens of pm.rad, is to be built in Beijing. We have obtained a hybrid 7BA lattice design, with a natural emittance of about 60 pm.rad and a circumference of about 1.3 kilometres, basically satisfying the requirement of on-axis longitudinal injection in HEPS. Nevertheless, it is interesting and necessary to explore the ultimate linear and nonlinear performance of the HEPS hybrid 7BA design. In this paper, we will introduce the multi-objective optimization with a successive and iterative implementation of the MOPSO and MOGA algorithms, and discuss certain relations between the nonlinear dynamics and linear optics of a hybrid MBA lattice. This study can provide reference for other DLSR lattice design and optimizations.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOW025
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WEPOW026	Recent Physical Studies for the HEPS Project	injection, booster, emittance, sextupole	2886
	G. Xu, Z. Duan, Y.Y. Guo, D. Ji, Y. Jiao, X.Y. Li, Y.M. Peng, Q. Qin, J. Qiu, S.K. Tian, J.Q. Wang, N. Wang, Y. Wei, C.H. Yu IHEP, Beijing, People's Republic of China
	The High Energy Photon Source (HEPS), a kilometre- scale storage ring light source, with a beam energy of 5 to 6 GeV and transverse emittances of a few tens of pm.rad, is to be built in Beijing and now is under design. In this paper we reported the progress and status of the physical studies for the HEPS project, covering issues of storage lattice design and optimization, booster design, injection design, collective effects, error study, insertion device effects, longitudinal dynamics, etc.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOW026
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WEPOW027	Initial Lattice Design for Hefei Advanced Light Source: A VUV and Soft X-ray Diffraction-limited Storage Ring	sextupole, storage-ring, emittance, quadrupole	2889
	Z.H. Bai, Q.K. Jia, W. Li, G. Liu, C.W. Luo, Q. Luo, L. Wang USTC/NSRL, Hefei, Anhui, People's Republic of China
	The upgrade project of Hefei Light Source was successfully completed in 2014 and has been operated for synchrotron radiation users since 2015, which is a second generation light source in the range of VUV and soft X-ray at NSRL in China. To meet the future requirements for users, more efforts are now putting at NSRL into the design of Hefei Advanced Light Source (HALS), a new VUV and soft-X ray diffraction-limited storage ring. The HALS storage ring will have an energy of 2 GeV and a natural emittance of about 50 pm·rad. This paper reports the initial lattice design studies, including linear optics design and nonlinear dynamics optimization.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOW027
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WEPOW036	Bunch Length Measurements with Passive Harmonic Cavities for Uniform Fill Patterns in a 100 MHz RF System	storage-ring, simulation, impedance, cavity	2914
	T. Olsson, S.C. Leemann, P. Lilja MAX IV Laboratory, Lund University, Lund, Sweden
	The MAX IV facility includes two storage rings operated at 1.5 GeV and 3 GeV. Both rings make use of a 100 MHz RF system and are designed to operate with a uniform multibunch fill pattern as well as employ passive harmonic cavities to damp instabilities and increase Touschek lifetime. Recently, a discussion on timing modes at the MAX IV storage rings has been initiated by the user community. This implies operating the rings with other fill patterns than the originally planned multibunch mode and therefore detailed studies of the performance of the harmonic cavities are of interest. This paper presents bunch length measurements at the 100 MHz MAX II storage ring for uniform fill patterns. The purpose of the measurements was to evaluate the employed measurement method and simulation codes for future studies of fill patterns in the MAX IV storage rings.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOW036
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WEPOW038	Proposed Upgrade of the SLS Storage Ring	emittance, storage-ring, sextupole, optics	2922
	A. Streun, M. Aiba, M. Böge, C. Calzolaio, M.P. Ehrlichman, A. Müller, A. Saá Hernández, H.S. Xu PSI, Villigen PSI, Switzerland
	A new storage ring is planned for the upgrade of the Swiss Light Source (SLS). It will replace the 12 triple bend achromats by twelve 7-bend achromats, which are based on low aperture longitudinal gradient bends (LGBs) and anti-bends (ABs), thus reducing the emittance from 5.0 nm to about 150 pm at 2.4 GeV while maintaining the source points of the undulator based beam lines. Sextupole and octupole strengths are determined using a multi-objective genetic algorithm (MOGA) and result in sufficient dynamic aperture for off-axis injection and several hours of Touschek lifetime. Superconducting LGBs of 5-6 T peak field will extend the photon range of the SLS up to 80-100 keV. The vacuum system will be based on a 20 mm inner diameter copper beam pipe with ante-chamber, and discrete getter pumps. It is planned to reuse the existing injector complex and the dynamically adjustable girder system.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOW038
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WEPOW044	Study of a Double Triple Bend Achromat (DTBA) Lattice for a 3 GeV Light Source	sextupole, optics, quadrupole, dipole	2940
	A. Alekou, R. Bartolini JAI, Oxford, United Kingdom A. Alekou, R. Bartolini Oxford University, Physics Department, Oxford, Oxon, United Kingdom A. Alekou, R. Bartolini, T. Pulampong, R.P. Walker DLS, Oxfordshire, United Kingdom N. Carmignani, S.M. Liuzzo, P. Raimondi ESRF, Grenoble, France
	Starting from the concepts of the Hybrid Multi Bend Achromat (HMBA) lattice developed at ESRF and of the Double-Double Bend Achromat (DDBA) lattice developed at Diamond, we present a new cell that includes all the advantages of the two designs. The resulting Double Triple Bend Achromat (DTBA) cell allows for a natural horizontal emittance of less than 100 pm with a large dynamic aperture and lifetime. It includes two straight sections, for insertion devices, five and three meters long. The lattice is consistent with the engineering design developed for the ESRF-EBS lattice and the layout and user requirements of Diamond. The characteristics of the cell are presented together with the results of the optimisation process.
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WEPOW045	Concepts for a Low Emittance-High Capacity Storage Ring for the Diamond Light Source	emittance, photon, wiggler, dipole	2943
	R. Bartolini, G. Cinque, G. Evans, K. Sawhney, J. Zegenhagen DLS, Oxfordshire, United Kingdom
	The Diamond Light Source is investigating several paths for a possible machine upgrade to Diamond II. The exercise is driven by by a joint assessment of the science capabilities opened by a very low emittance ring and the machine design that will underpin them. The consultation is made on a beamline-by-beamline basis and has highlighted a significant preference for lattices that combine both a low emittance and large capacity for IDs.
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WEPOW049	Physics Design Progress towards a Diffraction Limited Upgrade of the ALS	emittance, injection, brightness, dynamic-aperture	2956
	C. Steier, J.M. Byrd, S. De Santis, H. Nishimura, D. Robin, F. Sannibale, C. Sun, M. Venturini, W. Wan LBNL, Berkeley, California, USA
	Funding: This work was supported by the Laboratory Directed Research and Development Program of Lawrence Berkeley National Laboratory under U.S. Department of Energy Contract No. DE-AC02-05CH11231. Improvements in brightness and coherent flux of more than two orders of magnitude are possible using multi bend achromat lattice designs. These improvements can be implemented as upgrades of existing facilities, like the proposed upgrade of the Advanced Light Source. We will describe the progress in the physics design of this upgrade, including lattice evolution, error tolerance studies, simulations of collective effects, and intra beam scattering.
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WEPOW050	Optimization of the ALS-U Storage Ring Lattice	emittance, storage-ring, quadrupole, injection	2959
	C. Sun, H. Nishimura, D. Robin, F. Sannibale, C. Steier, M. Venturini, W. Wan LBNL, Berkeley, California, USA
	Funding: Work supported by the Director Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231 The Advanced Light Source (ALS) at Lawrence Berkeley National Laboratory is proposing the upgrade of its synchrotron light source to reach soft x-ray diffraction limits within the present ALS footprint. The storage ring lattice design and optimization of this light source is one of the challenging aspects for this proposed upgrade. The candidate upgrade lattice needs not only to fulfill the physics design requirements such as brightness, injection efficiency and beam lifetime, but also to meet engineering constraints such as space limitations, maximum magnet strength as well as beamline port locations. In this paper, we will present the approach that we applied to design and optimize a multi-bend achromat based storage ring lattice for the proposed ALS upgrade.
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WEPOW053	CESR Lattice for Two Beam Operations with Narrow Gap Undulators at CHESS	undulator, injection, operation, simulation	2968
	S. Wang, D. L. Rubin, J.P. Shanks Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
	Funding: Work was supported by NSF DMR-0936384 and NSF DMR-1332208. CESR has operated as a dedicated light source since the conclusion of colliding beam program in 2008. Two undulators with a 6.5mm-vertical gap were installed in Fall 2014, replacing a wiggler in the sextant of CESR that is the home to all CHESS beam lines. In order to operate narrow gap undulators with two beams, CESR pretzel lattice was redesigned so that e^- and e⁺ orbits are coincident in one machine sextant but separated in return arcs. In particular both e^- and e⁺ orbits are on axis through undulators. This "arc-pretzel" lattice has been the basis for undulator operation. To better understand the beam dynamics and improve machine performance, we developed many simulation tools: undulator modeling, injection tracking, etc. With installation of an additional quadrupole near undulators, the CESR lattice will be further modified with a low beta waist in the insertion devices, allowing a more than two fold reduction of local beta functions. This reduction is anticipated to mitigate the effects of small aperture and undulator field errors and to enhance the xray brightness. The characterization of the lattice will be compared with measurements of injection efficiency, tune scans, etc.
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WEPOW056	Reproducibility of Orbit and Lattice at NSLS-II	quadrupole, operation, optics, storage-ring	2976
	J. Choi, T.V. Shaftan BNL, Upton, Long Island, New York, USA
	Funding: DOE contract No: DE-SC0012704 In operating a high-end synchrotron light source, like NSLS-II, it is important to understand the machine accurately and have the ability to reproduce the desired machine state when needed. The obstacles, we can imagine, include the magnet hysteresis effect and some environmental effects. To minimize hysteresis effect, we cycle the magnets and it was proved working properly. On the other hand, from the point of long-term operation, we are not yet satisfied with the reproducibilities given by the same set of magnet currents and the machine needs additional tuning processes. In this paper, the experience of NSLS-II operation and studies are presented.
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WEPOY016	Use of Nonuniform Magnets for Emittance Reduction	emittance, dipole, simulation, radiation	3014
	E.B. Levichev, G.N. Baranov, S.V. Sinyatkin BINP SB RAS, Novosibirsk, Russia
	We study a theoretical minimum emittance (TME) for a non-uniform bending magnet including a three-step bend (sandwich magnet), a dipole with linear ramp of the bend-ing radius and the same but with a central segment of constant field. We derive expression for the minimum emittance and expand it into a power series with respect to the bending angle. A zero-order term naturally gives the uniform magnet TME while higher-order terms are responsible for the emittance reduction. Theoretical re-sults are verified by numerical simulation.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOY016
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WEPOY040	Lattice Translation Between Accelerator Simulation Codes for Superkekb	solenoid, quadrupole, closed-orbit, optics	3077
	D. Zhou, H. Koiso, A. Morita, Y. Ohnishi, K. Oide, H. Sugimoto KEK, Ibaraki, Japan M.E. Biagini INFN/LNF, Frascati (Roma), Italy N. Carmignani, S.M. Liuzzo ESRF, Grenoble, France D. Sagan Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
	To improve collaborative studies on beam dynamics for SuperKEKB between several labs, efforts have been made to translate the SAD lattices of SuperKEKB rings to the versions for other codes: AT, Bmad, MAD-X, and PTC. It turns out that lattice translations between these codes are not straightforward because of the complexity of the SuperKEKB lattices. In this paper, we describe our experiences of lattice translations, and present some results of benchmarks for the case of SuperKEKB.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOY040
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WEPOY051	Performance Optimization of Multi-particle Beam Dynamics Code IMPACT-Z on NVidia GPGPU	GPU, operation, linac, diagnostics	3110
	Z.Q. He, G. Shen, Y. Yamazaki FRIB, East Lansing, Michigan, USA X. Wang ICER, MSU, East Lansing, USA
	Funding: The work is supported by the U.S. National Science Foundation , the U.S. Department of Energy Office of Science, the Institute for Cyber-Enabled Research, MSU. Facility for Rare Isotope Beams is designed using a multiparticle tracking code IMPACT-Z. IMPACT-Z is originally for the purpose of accelerator design, so it is precise, however, quite time consuming, therefore usually not suitable for on-line beam tuning applications. IMPACT-Z is originally boosted using Message Passing Interface (MPI) technology. For single node mode, performance of IMPACT-Z is usually bounded by CPU performance, and for multimode mode, communication between MPI processes would become bottleneck. However, new emerging High Performance Computing (HPC) technology, like general-purpose graphics processing unit (GPGPU), brings new possibility in accelerating IMPACT-Z, so that the speed of IMPACT-Z satisfies for on-line beam tuning applications. This paper presents the efforts in exploring the capability of Nvidia GPGPU and the results of speed up of IMPACT-Z.
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WEPOY053	Comparison of Tracking Codes for the Determination of Dynamic Aperture in Storage Rings	dynamic-aperture, dipole, storage-ring, experiment	3114
	R. Hipple, M. Berz MSU, East Lansing, Michigan, USA
	Funding: This work is supported by the U.S. Department of Energy under grant number DE-FG02-08ER41546 Currently there is a great deal of activity towards making precision measurements utilizing storage rings, for example the Muon g-2 experiment at Fermilab, and the Electric Dipole Moment (EDM) program of the JEDI Collaboration. These experiments are intended to perform measurements requiring sub-ppm precision. Of utmost importance in this regard is the ability of tracking codes to treat all nonlinear effects arising from the detailed field distributions present in the system, not the least of which are fringe fields. In previously published work,,, we performed parallel tests of various tracking codes in order to compare and contrast the results. In this study, we continue this line of research and extend the scope to parallel-faced dipoles and electrostatic dipoles. R.Hipple, M. Berz, Microscopy and Microanalysis 21 Suppl. 4 (2015) ** R. Hipple, M.Berz, MODBC3, ICAP 2015, in press.
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WEPOY054	A Matlab Interface Package for Elegant Simulation Code	booster, quadrupole, space-charge, betatron	3117
	V.V. Smaluk, T.V. Shaftan, G.M. Wang BNL, Upton, Long Island, New York, USA
	Funding: Work supported by DOE contract DE-AC02-98CH10886 A Matlab interface package for Elegant simulation code is under development. This package combines advantages of Elegant, which is one of the most advanced codes for accelerator simulations, with advantages of useful and effective Matlab functions for data processing, analysis, optimization, and real-time machine control using Maltab Middle Layer. A number of functions have been already developed: calculation of lattice parameters and Twiss functions, linear and high-order chromaticity, amplitude-dependent tune shifts, modification of lattice elements, correction of betatron tunes and chromaticity, a set of functions for graphic representation. These functions have been successfully used at NSLS-II for tracking and turn-by-turn simulations near the half-integer resonance, for maximizing tunability and dynamic aperture of NSLS-II Booster, and for calculating limits of top-up Booster energy interlock.
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WEPOY055	NSLS-II Accelerator Commissioning and Transition to Operations	operation, storage-ring, vacuum, injection	3120
	T.V. Shaftan BNL, Upton, Long Island, New York, USA
	Over past year NSLS-II has completed accelerator commissioning and enabled operations of first project beam lines. Recently we further optimized the NSLS-II accelerators, increased the beam current to 400 mA without- and to 250 mA with Insertion Devices (IDs), commissioned top-off mode of operations and stabilized beam orbit to below 10% of the beam size in the source points. In this paper we report progress on the NSLS-II accelerator commissioning and operations and plans for future facility developments.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOY055
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THPMB005	Notes on Steffen Parameters of Extended Fringe-Field Quadrupoles	quadrupole, focusing, real-time, optics	3226
	V. Balandin, W. Decking, N. Golubeva DESY, Hamburg, Germany
	We consider some theoretical aspects of the Steffen hard-edge model of quadrupoles with extended fringe-fields and discuss possibilities of usage of this model in online beam dynamics applications.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMB005
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THPMB006	Unclosed Lattice Dispersions as a Tool for Partial Removal of Transverse to Longitudinal Beam Correlations	emittance, coupling, synchrotron, optics	3229
	V. Balandin, W. Decking, N. Golubeva DESY, Hamburg, Germany
	We show how to choose unclosed lattice dispersions in order to zero either linear beam dispersions (linear correlations between energy of particles and their transverse positions and momenta) or linear beam tilts (linear correlations between longitudinal positions of particles and their transverse coordinates). Besides that, we prove that while removal of beam dispersions always leads to reduction of transverse projected emittances, zeroing of beam tilts cannot guarantee it.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMB006
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THPMB009	Model Driven Machine Improvement of COSY Based on ORM Data	quadrupole, optics, dipole, closed-orbit	3240
	C. Weidemann, M. Bai, F. Hinder, B. Lorentz FZJ, Jülich, Germany
	The COoler SYnchrotron in Jülich accelerates and stores unpolarized and polarized proton or deuteron beams in the momentum range between 0.3 GeV/c and 3.65 GeV/c [,]. This, in combination with its diverse capabilities of phase space cooling and the flexibility of the lattice with respect to ion-optical settings makes COSY an ideal test facility for accelerator technology development. High demands on beam control and beam based measurements have to be fulfilled for future experiments such as the proposed precursor experiment for a direct measurement of the electric dipole moment of the deuteron (see [] and references within). The analysis of measured orbit response matrices (ORM), which com- prise the focussing structure of the ring, allows for a better understand- ing of machine imperfections such as gradient errors and misalignments of quadrupole magnets. This contribution presents the development of a MAD-X based LOCO (Linear Optics from Closed Orbits) algorithm [*] in a C++ program aiming to calibrate and correct linear optics as well as improving beam control at COSY. R. Maier, NIM A 390, 1 (1997). S.A. Martin et al., NIM A 236, 249-255 (1985). * D. Eversmann et al. [JEDI Collaboration], Phys. Rev. Lett. 115, 094801 (2015). **** J. Safranek, NIM A 388, 27 (1997).
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THPMB012	The HMBA Lattice Optimization for the New 3 GeV Light Source	brightness, emittance, storage-ring, injection	3251
	K. Harada, M. Adachi, N. Funamori, T. Honda, Y. Kobayashi, N. Nakamura, K. Oide, H. Sakai, S. Sakanaka, K. Tsuchiya KEK, Ibaraki, Japan
	For the design study of the HMBA (hybrid multi bend achromat) type most advanced light source, the new storage ring was designed from the lattice of the phase II upgrade project of the ESRF (ESRF II). Although the original 3 GeV test lattice from Dr. Pantaleo Raimondi of ESRF has no problem about the optical and magnetic parameters including the dynamic aperture, we reduce the cell numbers and inserted the short straight sections for the in-vacuum short-gap undulators. After the optimization of the linear and non-linear optics as the original design principle of ESRF II, the altered lattice has the circumference of about 440 m with 16 HMBA cells, the emittance about 440 pm rad with the intra-beam scattering effect at the beam current of 500 mA, and the large dynamic aperture of about 2 cm at the injection point even with the usual magnetic errors.
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THPMB017	The Errors Study on a Recent Heps Low-Beta Design	optics, emittance, sextupole, quadrupole	3260
	D. Ji, Y. Jiao, G. Xu IHEP, Beijing, People's Republic of China
	The next synchrotron light source High Energy Photon Source is currently studied at Beijing. A nominal design for the HEPS, in a hybrid 7BA lattice and with an emittance of 60 pm.rad in a circumference of 1.3 kilometers, is completed for further study. In this paper, we present some work on error effect based on the nominal lattice design. Topics covered include dynamic aperture and beam parameters affected by magnetic field error, systematic and random multipole errors and misalignment effect.
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THPMB018	Candidate Booster Design for the HEPS Project	emittance, booster, sextupole, injection	3263
	Y.M. Peng, Y.Y. Guo, Y. Jiao, Y. Wei, G. Xu IHEP, Beijing, People's Republic of China
	The High Energy Photon Source (HEPS), with trans-verse emittances of a few tens of pm.rad, is to be built in the suburbs of Beijing, China. The HEPS booster is a 2 Hz electron synchrotron. It accelerates electron bunches from a 300 MeV linac to a final energy of 6 GeV, and then extracts and injects them into the stor-age ring. We have made a candidate booster design, with a circumference of about 432 m and a natural emittance of about 4 nm.rad at 6GeV, which will be located in a separate tunnel. This lattice has a four-fold symmetry. Each super-period is composed of 13 iden-tical cells and two matching cells. The lattice design and optimization and other considerations are present-ed in a detail.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMB018
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THPMB019	Comparing the Performance of MOGA and MOPSO in Optimization of the HEPS Performance	emittance, sextupole, quadrupole, storage-ring	3266
	Y. Jiao, G. Xu IHEP, Beijing, People's Republic of China
	The High Energy Photon Source (HEPS), a kilometre- scale diffraction-limited storage ring light source, with a beam energy of 5 to 6 GeV and emittances of a few tens of pm.rad, is to be built in Beijing. A preliminary design with a hybrid 7BA lattice, an emittance of 60 pm.rad and a circumference of about 1.3 kilometers, has been made. Based on this design, we optimized the linear and nonlinear performance of the ring with the MOGA and MOPSO algorithms. From comparison of the performance of these two algorithms, it was found that MOPSO promises higher diversity than MOGA, while MOGA can reach better convergence than MOPSO. To reach a true Pareto front, a successive and iterative implementation of the PSO and MOGA, rather than using either of these two algorithms, is suggested.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMB019
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THPMB022	Direct and High Resolution Beta-Function Measurements for Storage Ring Lattice Characterization	quadrupole, betatron, storage-ring, closed-orbit	3272
	W. Li, H. Hao, Y.K. Wu FEL/Duke University, Durham, North Carolina, USA W. Li, W. Xu USTC/NSRL, Hefei, Anhui, People's Republic of China
	Betatron functions are a set of commonly used merits to characterize the lattice performance of a circular accelerator. The betatron functions in many accelerators can be computed using a lattice model trained or calibrated using a set of closed orbit responses, which is exemplified by the widely used LOCO technique. However, for some accelerators, like Duke storage ring with quad-sextupole combined function magnets, LOCO cannot be employed in any straight forward manner. In this case, direct measurements for betatron function are required. One way to determine betatron functions at the location of quadrupoles for a circular accelerator is to use the relationship between the quadrupole strength variations and the corresponding betatron tune change. In this paper, we present a set of carefully developed techniques to accurately measure the betatron functions at the location of quadrupoles, which allow us to achieve extremely high accuracy. Measurement errors will be discussed, and the detailed measurement technique will be present. Finally, we'll report preliminary experimental results of beta function measurements in the Duke storage ring with statistical error on the order of 1%.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMB022
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THPMB023	Lattice Compensation of the Wiggler Effect in HLSII with Particle Swarm Optimization	wiggler, storage-ring, insertion, insertion-device	3275
	G. Liu, L. Wang, K. Xuan USTC/NSRL, Hefei, Anhui, People's Republic of China
	The upgrade project of Hefei Light Source (HLSII) has successfully reduced the natural emittance of the electron beam to lower than 40 nm·rad at 800 MeV with five insertion devices installed. To provide enough straight sections for these insertion devices, the lattice structure has been changed to four double bend achromatic (DBA) with two super-periods from the former four triple bend achromatic (TBA). These different types of the insertion devices can greatly improve the performance of the light source, but simultaneously they can also influence the dynamics of the electron beam in the storage ring. Especially they can bring the distortion of the linear beam optics seriously. In order to make sure the stability and the quality of the beam meeting the design goal, the effect of these insertion devices must be compensated. In this paper, a direct compensation method is applied for the wiggler in the HLSII storage ring with the particle swarm optimization.
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THPMB024	Error Analysis for the Lattice of FELiChEM	FEL, undulator, simulation, emittance	3278
	S. Huang, Z.G. He, W. Xu, S.C. Zhang, T. Zhang USTC/NSRL, Hefei, Anhui, People's Republic of China
	FELiChEM is a new experimental facility under construction at University of Science and Technology of China (USTC).The facility consists of the middle-infrared (MID-FEL) beam line for 2.5-50 um and the Far-infrared (FAR-FEL) beam line for 40-200um. To achieve the design FEL performance of IR-FEL, the beam with 30 mm-mrad emittance, 5 ps rms length and 1nC bunch charge is required. We conduct error analysis in order to evaluate the tolerances of machine parameters and alignments. In this paper, we simulate the orbit corrections and emittance growth under exist of misalignments and strength errors of magnets. The simulation results show that the trajectory errors can be corrected to mm levels in the whole lattice and the emittance increase is acceptable. At the entrance of undulator, the position and angular errors can be corrected very well. So the trajectory can be controlled in the undulator to meet the requirement of FEL.
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THPMB029	Simultaneous Two Beam Acceleration Lattice Design Study for the Post Linear Accelerator of RISP	ion, acceleration, emittance, simulation	3294
	S.W. Jang KNU, Deagu, Republic of Korea E.-S. Kim Korea University Sejong Campus, Sejong, Republic of Korea
	The Rare Isotope Science Project, RISP, is the research complex by using heavy ion accelerator, which RISP research complex consists of front-end system, super conducting linear accelerator(SCL), ISOL system, In-fight system. The original purpose of post linear accelerator was for the alternative acceleration of stable driver beam from ECR ion source and unstable rare isotope beam from ISOL system. The new concept of acceleration method by using post accelerator lattice was studied to get more benefits. The idea was the simultaneous acceleration of stable driver beam and RI beam by using the average A/q value of post accelerator lattice. For the simultaneous two beam acceleration study, we used two ion beams the first one was 58Ni+8 and the other one was 132Sn+20. The beam dynamics simulation was performed by TRACK and TraceWin codes. In this poster, we will describe the results of beam dynamics study for the simultaneous two beam acceleration of the post linear accelerator of RISP.
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THPMB035	A Comparative Study of Low Energy Compact Storage Rings for a Thomson Scattering X-ray Source	storage-ring, scattering, emittance, dynamic-aperture	3308
	L. Ovchinnikova, V.I. Shvedunov SINP MSU, Moscow, Russia E.G. Bessonov, M.V. Gorbunkov LPI, Moscow, Russia A.A. Mikhailichenko Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA V.I. Shvedunov LEA MSU, Moscow, Russia
	A low-energy (<50 MeV) compact storage ring is a basic component of an X-ray source with high average flux based on Thomson scattering. Such ring provides electron bunches with ~1 nC charge and repetition rate up to 100 MHz for interaction with intense laser pulses. Such ring should provide a small (tens of microns rms) beam radius at interaction point, must have large dynamic aperture, sufficient space for allocation of different elements, such as laser resonator, RF cavity, fast beam injection/extraction systems, beam pick-ups and correctors. In this report, we present the results of comparative study of four versions of storage ring with different structure of lattices.
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THPMB036	Model-Dependent Accelerator Lattice Fit Based on BPM Data and Generating Functions	sextupole, quadrupole, operation, alignment	3311
	Yu. Maltseva, I.A. Morozov BINP SB RAS, Novosibirsk, Russia
	Obtaining accurate linear and nonlinear accelerator models is critical for routine accelerator operation. Here we consider a method based on BPM data and generating functions that provides fitted accelerator model. Using measurements from at least three BPMs and generating functions between them allows obtaining momenta at BPMs as the functions of model parameters and comparing them. Thus, lattice parameters can be fitted. Theoretical results are presented and the method is applied to the model examples.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMB036
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THPMB045	Comparison of Optics Measurement Methods in ESRF	optics, storage-ring, sextupole, dipole	3343
	L. Malina, J.M. Coello de Portugal, A. Langner, T. Persson, P.K. Skowroński, R. Tomás CERN, Geneva, Switzerland L. Farvacque, A. Franchi ESRF, Grenoble, France
	The N-BPM and the Amplitude methods, which are used in the LHC for beam optics measurement, were applied to the ESRF storage ring. We compare the results to the Orbit Response Matrix (ORM) method that is routinely used in the ESRF. These techniques are conceptually different since the ORM is based on the orbit response upon strength variation of steering magnets while the LHC techniques rely on the harmonic analysis of turn-by-turn position excited by a kicker or an AC dipole. Finally, we compare these methods and show the differences in their performance in the ESRF environment.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMB045
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THPMB049	Optics Calibration During Commissioning of the Taiwan Photon Source	optics, quadrupole, coupling, emittance	3357
	F.H. Tseng, C.H. Chen, J.Y. Chen, M.-S. Chiu, C.-C. Kuo, Y.-C. Liu, H.-J. Tsai NSRRC, Hsinchu, Taiwan
	The Taiwan Photon Source is a 3-GeV low emittance synchrotron light machine with circumference of 518.4m. The lattice is with 24-cell DBA structure and emittance is 1.6 nm-rad. During the commissioning in the past year, we employed MATLAB-based high level applications to calibrate the optical functions in three different operation lattice modes. In particular, we used LOCO (Linear Optics from Closed Orbit) to restore the machine optical functions and reduce emittance coupling ratio. The beam-based alignment (BBA) measurements as well as BPM and corrector errors were identified.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMB049
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THPMB050	The Commmissioning of Phase-I Insertion Devices in TPS	storage-ring, coupling, undulator, radiation	3360
	M.-S. Chiu, C.H. Chang, C.H. Chen, J. Chen, J.Y. Chen, Y.-S. Cheng, P.C. Chiu, P.J. Chou, T.Y. Chung, S. Fann, K.H. Hu, C.H. Huang, J.C. Huang, C.-S. Hwang, C.-C. Kuo, T.Y. Lee, C.C. Liang, Y.-C. Liu, H.-J. Tsai, F.H. Tseng, C.Y. Wu NSRRC, Hsinchu, Taiwan
	The Taiwan Photon Source (TPS) is a low-emittance 3-GeV light source at Natioal Synchrotron Radiation Research Center, next to the Taiwan Light source (1.5 GeV). On March 26, 2015, the TPS storage ring with two 5-cell PETRA cavities has successfully operated in 100 mA in top-up mode without the installation of insertion devices (IDs). To reach the design goal of 500 mA, the machine was shut down for 5 months to replace PETRA cavitites with superconducting RF (SRF) cavities and to install 10 IDs: 7 in-vacuum undulators (IU) and 3 elliptically polarized undulators (EPU). The commissioning of TPS storage ring with SRF cavities and IDs began in Sep. 2015. In this paper, we present our results and proceedures of ID commissioning.
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THPMB053	nuSTORM FFAG Decay Ring	resonance, factory, storage-ring, closed-orbit	3369
	J.-B. Lagrange, J. Pasternak Imperial College of Science and Technology, Department of Physics, London, United Kingdom R.B. Appleby, J.M. Garland, H.L. Owen, S.C. Tygier UMAN, Manchester, United Kingdom R.B. Appleby Cockcroft Institute, Warrington, Cheshire, United Kingdom A.D. Bross, A. Liu Fermilab, Batavia, Illinois, USA J. Pasternak STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
	The neutrino beam produced from muons decaying in a storage ring would be an ideal tool for precise neutrino cross section measurements and search for sterile neutrinos due to its precisely known flavour content and spectrum. In the proposed nuSTORM facility pions would be directly injected into a racetrack storage ring, where circulating muon beam would be captured. The storage ring has two options: a FODO solution with large aperture quadrupoles and a racetrack FFAG (Fixed Field Alternating Gradient) using the recent developments in FFAGs. Machine parameters, linear optics design and beam dynamics are discussed in this paper.
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THPMB054	FFAG Beam Line for nuPIL - Neutrinos from PIon Beam Line	proton, target, detector, experiment	3372
	J.-B. Lagrange, J. Pasternak Imperial College of Science and Technology, Department of Physics, London, United Kingdom R.B. Appleby, S.C. Tygier UMAN, Manchester, United Kingdom R.B. Appleby Cockcroft Institute, Warrington, Cheshire, United Kingdom A.D. Bross, A. Liu Fermilab, Batavia, Illinois, USA J. Pasternak STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
	The Long Baseline Neutrino Facilities (LBNF) program aims to deliver a neutrino beam for the Deep Underground Neutrino Experiment (DUNE). The current baseline for LBNF is a conventional magnetic horn and decay pipe system. Neutrinos from PIon beam Line (nuPIL) is a part of the optimization effort to optimize the LBNF. It consists of a pion beam line after the horn to clean the beam of high energy protons and wrong-sign pions before transporting them into a decay beam line, where instrumentation could be implemented. This paper focuses on the FFAG solution for this pion beam line. The resulting neutrino flux is also presented.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMB054
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THPMB055	A FODO Beam Line Design for nuPIL	dipole, optics, detector, proton	3375
	A. Liu, A.D. Bross Fermilab, Batavia, Illinois, USA J.-B. Lagrange Imperial College of Science and Technology, Department of Physics, London, United Kingdom
	Funding: Fermi National Accelerator Laboratory The Fermilab Deep Underground Neutrino Experiment (DUNE) was proposed to determine the neutrino mass hierarchy and demonstrate leptonic CP violation. The current design of the facility that produces the neutrino beam (LBNF) uses magnetic horns to collect pions and a decay pipe to allow them to decay. In this paper, a design of a possible alternative for the conventional neutrino beam in LBNF is presented. In this design, a FODO magnet beam line is used to collect the pions from the downstream face of a horn, bend them by ∼ 5.8 degrees and then transport them in a straight beam line where they decay to produce neutrinos. The idea of using neutrinos from the PIon beam Line (nuPIL) provides flavor-pure neutrino beams that can be well understood by implementing standard beam measurement technology. The neutrino flux and the resulting δ_CP sensitivity from the FODO nuPIL are also presented in the paper.
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THPMR002	Optics Corrections with LOCO in the Fermilab Booster	optics, booster, sextupole, quadrupole	3385
	C.-Y. Tan, L.R. Prost, K. Seiya, A.K. Triplett Fermilab, Batavia, Illinois, USA
	Funding: Operated by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy. The optics of the Fermilab Booster has been corrected with LOCO (Linear Optics from Closed Orbits). However, the first corrections did not show any improvement in capture efficiency at injection. A detailed analysis of the results showed that the problem lay in the MADX optics file. Both the quadrupole and chromatic strengths were originally set as constants independent of beam energy. However, careful comparison between the measured and calculated tunes and chromatcity show that these strengths are energy dependent. After the MADX model was modified with these new energy dependent strengths, the LOCO corrected lattice has been applied to Booster. The effect of the corrected lattice will be discussed here.
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THPMR005	Systematic Errors Investigation in Frozen and Quasi-Frozen Spin Lattices of Deuteron EDM Ring	sextupole, storage-ring, dipole, experiment	3394
	V. Senichev, B. Lorentz FZJ, Jülich, Germany S.N. Andrianov, A.N. Ivanov St. Petersburg State University, St. Petersburg, Russia M. Berz, E. Valetov MSU, East Lansing, Michigan, USA S. Chekmenev, J. Pretz RWTH, Aachen, Germany
	The search for the electric dipole moment (EDM) in the storage ring raises two questions: how to create conditions for maximum growth of the total EDM signal of all particles in bunch, and how to differentiate the EDM signal from the induced magnetic dipole moment (MDM) signal. The T-BMT equation distinctly addresses each issue. Because the EDM signal is proportional to the projection of the spin on the direction of the momentum, it is desirable to freeze the spin direction of all particles in a bunch along momentum. It can be successfully implemented in the Quasi Frozen (QFS) and Frozen (FS) Spin structures. However, in case of magnet misalignments, the induced MDM signal may arise in the same plane as the EDM signal and thereby prevent its registration. In this paper, we analyze the effect of errors together with the spin-tune decoherence of all particles in the bunch for FS and QFS options.
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THPMR008	Experimental Crosscheck of Algorithms for Magnet Lattice Correction	betatron, optics, quadrupole, storage-ring	3400
	V.V. Smaluk, W. Guo, Y. Hidaka, Y. Li, G.M. Wang, L. Yang, X. Yang BNL, Upton, Long Island, New York, USA
	Funding: Work supported by DOE contract DE-AC02-98CH10886 Performance, capabilities and limitations of various algorithms for linear magnet optics correction have been studied experimentally at NSLS-II. For the crosscheck, we have selected 4 algorithms based on turn-by-turn beam position analysis: weighted correction of betatron phase and amplitude, independent component analysis, model-independent analysis, and driving-terms-based linear optics characterization. A LOCO algorithm based on closed orbit measurement has been used as a reference. For the correction, either iterative solving of linear problem (matrix inversion with singular-value decomposition) or variational optimization has been used. For all the algorithms, accuracy limitations and convergence of linear lattice correction are discussed.
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Paper

Title

Other Keywords

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MOYAA01

Commissioning of the MAX IV Light Source

storage-ring, emittance, injection, vacuum

11

M. Eriksson, E. Al-Dmour, Å. Andersson, M.A.G. Johansson, S.C. Leemann, L. Malmgren, P.F. Tavares, S. Thorin
MAX IV Laboratory, Lund University, Lund, Sweden

This presentation reports on the beam commissioning status of MAX IV, experience gained and lessons learned, as well as future plans.

Slides MOYAA01 [6.682 MB]

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MOZA02

Design and Optimization Strategies of Nonlinear Dynamics in Diffraction-limited Synchrotron Light Sources

sextupole, optics, emittance, resonance

33

R. Bartolini
DLS, Oxfordshire, United Kingdom
R. Bartolini
JAI, Oxford, United Kingdom

This talk introduces the most recent achievements in the control of nonlinear dynamics in electron synchrotron light sources, with special attention to diffraction limited storage rings. Guidelines for the design and optimization of the magnetic lattice are reviewed and discussed.

Slides MOZA02 [4.952 MB]

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MOOCB02

A Lattice Correction Approach through Betatron Phase Advance

sextupole, simulation, dynamic-aperture, betatron

62

W. Guo, S.L. Kramer, F.J. Willeke, X. Yang, L. Yu
BNL, Upton, Long Island, New York, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy
Most lattice correction algorithms, such as LOCO, rely on the amplitude of the BPM signals. However, these signals are a mixture of the BPM gain and beta-beat. Even though BPM gain can be fitted by analyzing the statistics of all the BPMs in a ring accelerator, we found the uncertainty is on the order of a few percent. On the other hand, the betatron phase advance, which is obtained from the correlation of two adjacent BPMs, is independent of the BPM gain and tilt error. It was found at NSLS-II that the measurement precision of the phase advance is typically 0.001 radian, which corresponds to about 0.2% of beta beat. The phase error can be corrected similarly using a response matrix, and at NSLS-II the phase error can be corrected to <0.005 radian (p-p) in less than half an hour. The same technique can be applied to the nonlinear lattice. By comparing the phase advance differences between the on- and off- orbit lattices, the sextupole strength error can be identified. Simulation and experimental results will be demonstrated in the paper.

Slides MOOCB02 [1.554 MB]

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MOPMB052

On-axis Injection using a Sin Wave RF Kicker

kicker, injection, storage-ring, emittance

211

B.C. Jiang, Y.B. Leng, S.Q. Tian, L.Y. Yu, M.Z. Zhang, Q.L. Zhang, Z.T. Zhao
SINAP, Shanghai, People's Republic of China

On-axis injection is one of the critical issues for an ul-tra-low emittance storage ring which holds a rather small dynamic aperture. In order to reduce the challenges of the fast pulsed kicker design, a sin wave RF kicker is studied which is suitable for longitudinal on-axis injection. Since the injected bunch is longitudinally apart from the stored bunches, the location of the stored bunches can be at the π knot of the sin wave, while the injected bunches are launched at a phase around π/2+n·π. At this situation the injected bunches will receive a transverse kick, however the store bunches are almost un-affected.

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MOPMW017

Performance of the Beam Position Monitor System in Solaris Synchrotron

storage-ring, synchrotron, quadrupole, monitoring

432

A. Kisiel, L.J. Dudek, P.P. Goryl, W.T. Kitka, M.P. Kopec, A.I. Wawrzyniak, L. Żytniak
Solaris, Kraków, Poland

The Beam Position Monitor (BPM) system in the Solaris National Synchrotron Radiation Centre consists of 8 striplines along a linear accelerator and a transfer line and 36 buttons around the storage ring. The beam position measurement in the linac is handled by 15 cm quarter wave directional striplines connected to Libera Single Pass E modules as readout devices. The circulating beam in the storage ring is monitored by set of 45 degree diagonal buttons in two geometries connected to Libera Brilliance⁺ devices. Properly configured BPM setup allows for direct measurement of the beam position stability, closed orbit, current of single train and the stored beam. Moreover, the slow acquisition and turn-by-turn data stream from BPMs in the storage ring are used for automatic orbit correction, computing beam lifetime on each button, measuring an orbit response, the beta function and other physical parameters of the electron beam. In order to improve the measurement reliability the beam based alignment has been performed. Within the presentation the performance of the BPM system in Solaris during commissioning phase will be discussed.

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MOPOR007

Local Impedance Measurements at ALBA from Turn-by-Turn Acquisition

impedance, insertion, vacuum, optics

598

M. Carlà, G. Benedetti, T.F.G. Günzel, U. Iriso, Z. Martí
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain

A transverse impedance source manifests itself, among other ways, by producing a small defocusing kick which depends on the beam bunch charge. By repeating optics measurements for different bunch charges, it is possible to disentangle the contribution produced by each impedance source from the dominating focusing effects given by the machine optics. But hunting for such faint defocusing effects poses strong requirements on the precision and sensibility of the measurements, and slow machine drifts or different thermal conditions shall be avoided. In this report, we present a novel method to assess in a fast and precise manner machine optics for different bunch charges using BPM turn-by-turn data and hybrid filling patterns. Finally, measurements for different ALBA machine components like scrapers and In-vacuum undulators are compared with simulation results.

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MOPOR019

Beta Function Measurement and Resonances Induced by Space Charge Force and Lattice Magnets

resonance, space-charge, emittance, simulation

641

K. Ohmi, K.G. Sonnad
KEK, Ibaraki, Japan

J-PARC MR has been operated at tune (ν_x,ν_y)=(22.40,20.75). A new operating point around (21.4,21.4) has been proposed by simulation studies on space charge effect since 2013. Machine experiments at the operating point has been performed since 2014 and many encouraging results are being obtained. We discuss why new operating point is better than present one from view point of space charge effects.

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MOPOR024

Evolution of High Intensity Beams in the CERN PS Booster after H⁻ Injection and Phase Space Painting

emittance, injection, space-charge, booster

656

M. Cieslak-Kowalska, J.L. Abelleira, E. Benedetto, C. Bracco
CERN, Geneva, Switzerland

With the LHC Injector Upgrade (LIU) project, the injection energy of PS Booster (PSB) ' first circular accelerator in the LHC injector chain ' will be raised from 50 MeV to 160 MeV and the present multiturn injection will be upgraded to H⁻ injection with transverse and longitudinal painting. In the scope of this project, it is planned to double the beam intensities, profiting from the fact that the βγ2 factor will be two times larger (0.35 at 50 MeV and 0.71 at 160 MeV), so the resulting tune spread driven by a direct space charge should remain similar. This paper describes the feasibility to double the intensity of high intensity and large emittance beams, looking into the evolution under space charge and taking into account losses constrains in the ring and in the extraction lines.

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MOPOW045

Measurement of Advanced Dispersion-based Beam-tilt Correction

electron, FEL, photon, laser

813

M.W. Guetg, F.-J. Decker, Y. Ding, P. Emma, Z. Huang, T.J. Maxwell
SLAC, Menlo Park, California, USA

Funding: DOE contract \#DE-AC02-76SF00515
Free electron lasers in the X-ray regime require a good slice alignment along the electron bunch to achieve their best performance. A transverse beam slice shift reduces this alignment and spoils projected emittance and optics matching. Coherent synchrotron radiation, specifically for over-compression going through full compression, and transverse wakefields are major contributors to this. In the case of the large-bandwidth operation, with a strong energy chirp on the bunch, this misalignments furthermore reduce the spectral bandwidth of the FEL pulse. Well-defined manipulation of dispersion allows to compensate for this slice centroid shifts, therefore enhancing lasing power and in case of the large bandwidth mode, spectral bandwidth. This work shows the first application of this correction on an X-ray FEL resulting in increase in beam-power and bandwidth.

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MOPOW046

RadiaBeam/SLAC Dechirper as a Passive Deflector

wakefield, electron, focusing, diagnostics

817

A. Novokhatski, A. Brachmann, M. Dal Forno, V.A. Dolgashev, A.S. Fisher, M.W. Guetg, Z. Huang, R.H. Iverson, P. Krejcik, A.A. Lutman, T.J. Maxwell
SLAC, Menlo Park, California, USA
J. Zemella
DESY, Hamburg, Germany

Funding: This work was supported by Department of Energy Contract No. DE-AC02-76SF00515.
We discuss the possibility of using the RadiBeam/SLAC dechirper recently installed at LCLS for measuring the bunch length of very short bunches, less than 1 fs perhaps as short as 100 atto second. When a bunch travels close to one of the jaws the particles of the bunch get a transverse kick depends upon the position of a particle in a bunch. The tail particles get more kick. The transverse force also gets a nonlinear dependence on the transverse position. The stretched bunch can be measured at the YAG screen that is 100 m downstream the dechirper. The most important aspect of this measurement is that that no synchronization is needed. The Green's function for the transverse kick was evaluated based on the precise wake field calculations of the dechirper corrugated structure*. Using this function we can restore the longitudinal shape of the bunch. This may also help to see if a bunch has any micro-bunch structure.
* A. Noovokhatski "Wakefield potentials of corrugated structures",Phys. Rev. ST Accel. Beams 18, 104402 (2015)

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MOPOW050

Study of Lower Horizontal Emittance Optics in the Present Soleil Storage Ring

emittance, quadrupole, optics, dynamic-aperture

827

H.C. Chao, P. Brunelle, A. Nadji, L.S. Nadolski, R. Nagaoka
SOLEIL, Gif-sur-Yvette, France

With the aim of delivering a lower horizontal emittance beam to the users of the present SOLEIL ring, a systematic lattice study is carried out. The goal is to discover feasible optics solutions having the horizontal emittance notably lower than the present value of 3.9 nm rad, while fulfilling all the physical requirements and without changing the current magnet structure in the lattice. The strategy adopted is a cell-wise optimization of the linear lattices in the two types of double-bend cells that constitute the SOLEIL ring. In the second step they are concatenated via finer matching. A global scan of the 5 quadrupole families for the search of stable solutions is performed. The statistical properties are given. One can easily select possible solutions without matching. For the second type of cell having 10 quadrupole families, another scan of quadrupoles and a matching using a quadrupole triplet are applied for linear optics characteristics. Finally, the nonlinear optimization is performed with modern nonlinear optimization algorithms.

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MOPOY002

Towards Beam-Dynamics Simulations Including More Realistic Field Descriptions for the HESR

multipole, dynamic-aperture, quadrupole, dipole

847

J.H. Hetzel, U. Bechstedt, J. Böker, A. Lehrach, B. Lorentz, R. Tölle
FZJ, Jülich, Germany

The High Energy Storage Ring (HESR) is part of the upcoming Facility for Antiproton and Ion Research (FAIR) placed in Darmstadt (Germany). The HESR is designed for antiprotons with a momentum range from 1.5 GeV/c to 15 GeV/c, but will as well be suitable to provide heavy ion beams with a momentum range from approximately 0.6 GeV/c to 5.8 GeV/c. To guarantee smooth operation it is crucial to verify and improve the design with beam-dynamics simulations. Particularly the dynamic aperture is calculated as a measure of quality. Complementary to previous beam dynamics calculations based on frequency map analysis*, the dynamic aperture is calculated using a variant of the Lyapunov exponent. The first bending and focusing magnets have been delivered and the magnetic fields measured recently. So the modeled assumptions regarding the multipole imperfections of these elements are now replaced by values based on measurements. This contribution contains the inclusion of the measured values as well as the the tracking-based dynamic aperture calculations.
* D.M. Welsch, A. Lehrach, B. Lorentz, R.Maier, D. Prasuhn, R.Tölle: "Investigation and Optimization of Transverse Non-Linear Beam Dynamics in the High-Energy Storage Ring HESR"; IPAC'10

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MOPOY032

Beam Twiss Measurement With Ws Including Space Charge Effect

experiment, space-charge, simulation, rfq

925

Y.L. Zhao, H. Geng, C. Meng, F. Yan
IHEP, Beijing, People's Republic of China

Wire Scanners (WS) are used to measure beam profile and calculate the transverse Twiss parameters at the entrance of MEBT1 in the CADS injector I test stand. As to data process, the traditional method with transfer map doesn't consider the space charge effect. But, as we know, space charge effect can't be neglected for high intensity accelerators. In this paper, optimization algorithm is used in beam emittance measurement.

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TUYA01

BEPCII Performance and Beam Dynamics Studies on Luminosity

luminosity, radiation, synchrotron, synchrotron-radiation

1014

C.H. Yu, Z. Duan, S. Gu, Y.Y. Guo, X.Y. Huang, D. Ji, H.F. Ji, Y. Jiao, Zh.C. Liu, Y.M. Peng, Q. Qin, Y.S. Sun, S.K. Tian, J.Q. Wang, N. Wang, X.H. Wang, Y. Wei, X.M. Wen, J. Wu, J. Xing, G. Xu, Y. Yue, C. Zhang, Y. Zhang
IHEP, Beijing, People's Republic of China

The upgrade of the Beijing Electron Positron Collider, BEPCII, is now in a good performance for both high energy physics and synchrotron radiation experiments. The luminosity at the design energy of 1.89 GeV reached the design value 1.0*10³³/cm²/s¹ recently. A lot of work, including accelerator physics study and technical progress, has been done for the luminosity enhancement, not only at the design energy, but all the energy region run for HEP experiments from 1.0 to 2.3 GeV. The performance of BEPCII and the process of luminosity enhancement will be described in detail.

Slides TUYA01 [5.801 MB]

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TUOBA03

Application of Differential Evolution Algorithm in Future Collider Optimization

dynamic-aperture, sextupole, collider, emittance

1025

Y. Zhang
IHEP, Beijing, People's Republic of China
D. Zhou
KEK, Ibaraki, Japan

Funding: Project U1332108 supported by NSFC.
The dynamic aperture of is very limited due to the very small beta at IP in the SuperKEKB. In the storage ring based Higgs factory, the vertical beta function is not so small, but the much larger circumference enlarge the detuning term especially in horizontal direction. It is very hard to optimize the dynamic aperture in the future colliders. The particle loss may comes from different cause for different energy or different transverse coupling. The design of CEPC is still in process. The construction of SuperKEKB is nearly finished, but there still exist some problem which could reduce the performance. There are a few hundred parameters to be varied in the future colliders. The global optimization may be a good way to enlarge the dynamic aperture. Differential Evolution is a very simple population based, stochastic function minimizer which is very powerful at the same time. In this paper we show some application of the algorithm in the two machines. It has the potential to help us optimize the machine.

Slides TUOBA03 [2.289 MB]

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TUOAB02

Conditions for CSR Microbunching Gain Suppression

dipole, emittance, synchrotron, synchrotron-radiation

1057

C.-Y. Tsai
Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA
S. Di Mitri
Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
D. Douglas, R. Li, C. Tennant
JLab, Newport News, Virginia, USA

Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177.
The coherent synchrotron radiation (CSR) of a high brightness electron beam traversing a series of dipoles, such as transport arcs, may result in phase space degradation. On one hand, the CSR can perturb electron transverse motion in dispersive regions along the beamline, causing emittance growth. On the other hand, the CSR effect on the longitudinal beam dynamics could result in microbunching gain enhancement. For transport arcs, several schemes have been proposed* to suppress the CSR-induced emittance growth. Similarly, several scenarios have been introduced** to suppress CSR-induced microbunching gain, which however mostly aim for linac-based machines. In this paper we try to provide sufficient conditions for suppression of CSR-induced microbunching gain along a transport arc, analogous to*. Several example lattices are presented, with the relevant microbunching analyses carried out by our semi-analytical Vlasov solver***. The simulation results show that lattices satisfying the proposed conditions indeed have microbunching gain suppressed. We expect this analysis can shed light on lattice design approach that could suppress the CSR-induced microbunching gain.
*D.Douglas et al, JLAB-ACP-14-1751, S.DiMitri et al, PRL (2013), R.Hajima, NIMA (2004), Y.Jiao et al, PRSTAB (2014)
**Z.Huang et al, PRSTAB (2004), Saldin et al, NIMA (2004)
***C.Tsai et al, FEL'15

Slides TUOAB02 [6.484 MB]

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TUPMB017

The Injection Septum Magnet for the Collector Ring (FAIR)

injection, septum, vacuum, operation

1145

P.Yu. Shatunov, D.E. Berkaev, I. Koop, E.P. Semenov, D.B. Shwartz
BINP SB RAS, Novosibirsk, Russia
A. Dolinskyy, S.A. Litvinov
GSI, Darmstadt, Germany
Yu. A. Rogovsky
Budker INP & NSU, Novosibirsk, Russia

Collector Ring is one of the key installations of the FAIR project (Darmstadt, Germany). It is dedicated for stochastic cooling of incoming beams of antiprotons and rare ions. Additionally there is a mode of operation for experiments in the ring. Beams for all modes of operation are injected through one transfer channel. Extremely high acceptance of the ring (240 mm*mrad) leads to large apertures of all magnetic elements including the septum magnet. Meanwhile planned parameters of the magnetic field and magnetic field quality are comparatively strict. The present state of the design of the pulsed injection septum for the CR is presented in this article together with the concept of the injection system.

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TUPMB021

SLAC FACET-II Positron Damping Ring Magnet Design

positron, damping, dipole, magnet-design

1154

M.A.G. Johansson
MAX IV Laboratory, Lund University, Lund, Sweden
Y. Cai, V. Yakimenko
SLAC, Menlo Park, California, USA

The FACET-II facility, currently being designed at SLAC, will contain a small ~20 m circumference, 335 MeV, positron damping ring. The ring has to fit in the existing linac tunnel, meaning that a compact lattice with short distances between magnets is required. The detailed magnet design is done in Opera-3d, with a finite element model of a full damping ring arc being simulated. This article presents this magnet design in a relatively early stage, with iteration between magnet and lattice design currently in progress.

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TUPMB023

MAX IV 3 GeV Storage Ring Magnet Block Production Series Measurement Results

storage-ring, dipole, octupole, synchrotron

1157

M.A.G. Johansson, L.-J. Lindgren, M. Sjöström, P.F. Tavares
MAX IV Laboratory, Lund University, Lund, Sweden

The MAX IV 3 GeV storage ring magnets are integrated "magnet block" units consisting of several consecutive magnet elements precision-machined out of a common solid iron block. In the 3 GeV ring, there are 140 magnet blocks containing a total of 1320 magnet elements. During the manufacturing phase of the project, a field measurement was performed for each magnet element, by Hall probe and/or by rotating coil. This article presents an overview of the magnetic field measurement results that were obtained for the full production series.

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TUPMB025

Conceptual Design of Storage Ring Magnets for a Diffraction Limited Light Source Upgrade of ALS, ALS-U

dipole, sextupole, quadrupole, magnet-design

1161

C.A. Swenson, D. Arbelaez, J.-Y. Jung, J.R. Osborn, S. Prestemon, D. Robin, D. Schlueter, C. Steier, C. Sun, E.J. Wallén
LBNL, Berkeley, California, USA

Funding: The Advanced Light Source is supported by the Director, Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231.
Lawrence Berkeley National Laboratory (LBNL) has been engaged in an internal laboratory directed research and development project to define a suitable accelerator physics lattice to support the diffraction limited upgrade of the Advanced Light Source*. Diffraction limited lattices require strong focusing elements throughout. Magnetics design is challenging in that the high gradient magnetic structures are required to operate in close proximity. Lattice development requires a coordinated engineering design effort to ensure the lattice design feasibility. We will present a review of the results of our magnet scoping studies as well as conceptual design specifications for the ALS-U lattice dipole, quadrupole, and sextupole magnet systems. Additionally we will present a conceptual design of refined super-bend magnets for the ALS-U lattice including a discussion of their potential impact on beam emittance.
* C. Steier, et al. Progress of the R&D towards a Diffraction Limited Upgrade of the Advanced Light Source, Proceedings of IPAC 2015,

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TUPMW001

SPPC Parameter Choice and Lattice Design

dipole, collider, proton, quadrupole

1400

F. Su
Institute of High Energy Physics (IHEP), People's Republic of China
S. Bai, T.J. Bian, Y.K. Chen, J. Gao, J.Y. Tang, D. Wang, Y. Wang
IHEP, Beijing, People's Republic of China

In this paper we showed a systematic method of appropriate parameter choice for a circular pp collider by using analytical expression of beam-beam tune shift limit started from given design goal and technical limitations. Based on parameters scan, we obtain a set of parameters for SPPC with different circumferences like 54km, 78km or 100km and different energies like 70TeV or 100TeV. We also showed the first version of SPPC lattice although it needs lots of work to do and to be optimized.

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TUPMW022

Modelling and Measurements of Bunch Profiles at the LHC Flat Bottom

emittance, scattering, radiation, damping

1477

S. Papadopoulou, F. Antoniou, J.E. Muller, Y. Papaphilippou, G. Trad
CERN, Geneva, Switzerland

At the LHC flat bottom the interplay between a series of effects (i.e. intrabeam scattering, longitudinal beam manipulations, non-linearities of the machine, etc) can lead to a population of the tails of the beam distributions, which may become non-Gaussian. This paper presents observations of the evolution of particle distributions in the LHC flat bottom. Novel distribution functions are employed to represent the beam profiles, and used as a guideline for generalising emittance growth rate estimations due to IBS. Finally, an attempt is made to benchmark an IBS Monte-Carlo simulation code, able to track 3D particle distributions, with the measured beam profile evolutions.

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TUPMW029

Tune and Chromaticity Control During Snapback and Ramp in 2015 LHC Operation

injection, controls, sextupole, dipole

1501

M. Schaumann, M. Juchno, M. Lamont, M. Solfaroli Camillocci, E. Todesco, J. Wenninger
CERN, Geneva, Switzerland

Because of current redistribution on the superconducting cables, the harmonic components of the magnetic fields of the superconducting magnets in the Large Hadron Collider (LHC) show decay during the low field injection plateau. This results in tune and chromaticity variations for the beams. In the first few seconds of the ramp the original hysteresis state of the magnetic field is restored - the field snaps back. These fast dynamic field changes lead to strong tune and chromaticity excursions that, if not properly controlled, induce beam losses and potentially trigger a beam dump. A feed-forward system applies predicted corrections during the injection plateau and to the first part of the ramp to avoid violent changes of beam conditions. This paper discusses the snapback of tune and chromaticity as observed in 2015, as well as the control of beam parameters during the ramp. It also evaluates the quality of the applied feed-forward corrections and their reproducibility.

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TUPMW040

Beam-beam Simulation for the 2015 RHIC Proton Run with Electron Lenses

proton, dynamic-aperture, electron, simulation

1533

Y. Luo, W. Fischer, X. Gu, G. Robert-Demolaize, V. Schoefer
BNL, Upton, Long Island, New York, USA
S.M. White
ESRF, Grenoble, France

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
Electron lenses were used for head-on beam-beam compensation for the first time in the 2015 Relativistic Heavy Ion Collider (RHIC) 100~GeV polarized proton run. Lattices with the achromatic telescopic squeeze (ATS) scheme of β^* are adopted to improve the off-momentum dynamic aperture. The phase advances between the electron lenses to one of the two collisional points are set to kπ to minimize the beam-beam resonance driving terms. In this article, we present the results from weak-strong and strong-strong beam-beam simulations with head-on beam-beam compensations for these lattices. Simulations are also carried out aiming to explain the observations from operation.

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TUPMY004

The MICE Demonstration of Muon Ionization Cooling

emittance, betatron, simulation, experiment

1547

J.-B. Lagrange, C. Hunt, J. Pasternak
Imperial College of Science and Technology, Department of Physics, London, United Kingdom
V.C. Palladino
INFN-Napoli, Napoli, Italy
J. Pasternak
STFC/RAL, Chilton, Didcot, Oxon, United Kingdom

Funding: STFC, DOE, NSF, INFN, CHIPP AND MORE
Muon beams of low emittance provide the basis for the intense, well-characterised neutrino beams necessary to elucidate the physics of flavour at the Neutrino Factory and to provide lepton-antilepton collisions up to several TeV at the Muon Collider. The international Muon Ionization Cooling Experiment (MICE) will demonstrate muon ionization cooling, the technique proposed to reduce the phase-space volume occupied by the muon beam at such facilities. In an ionization-cooling channel, the muon beam traverses a material (the absorber) loosing energy, which is replaced using RF cavities. The combined effect is to reduce the transverse emittance of the beam (transverse cooling). The configuration of MICE required to deliver the demonstration of ionization cooling is being prepared in parallel to the execution of a programme designed to measure the cooling properties of liquid-hydrogen and lithium hydride. The design of the cooling-demonstration experiment will be presented together with a summary of the performance of each of its components and the cooling performance of the experiment.
Submitted by the MICE speakers bureau that will identify later a member of the collaboration to present the contribution

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TUPMY006

MICE Step IV Optics without the M1 Coil in SSD

emittance, solenoid, simulation, scattering

1553

A. Liu
Fermilab, Batavia, Illinois, USA

Funding: Fermi National Accelerator Laboratory
The international Muon Ionization Cooling Experiment (MICE) will demonstrate ionization cooling, the only technique that, given the short muon lifetime, can reduce the phase-space volume occupied by a muon beam quickly enough. MICE will demonstrate cooling in two steps. In the first one, Step IV, MICE will study the multiple Coulomb scattering in liquid hydrogen (LH2) and lithium hydride (LiH). A focus coil module will provide focussing on the absorber. The transverse emittance will be measured upstream and downstream of the absorber in two spectrometer solenoids (SS). Magnetic fields generated by two match coils in the SSs allow the beam to be matched into a flat-field regions in which the tracking detectors are installed. An incident in September 2015 rendered matching coil \#1 (M1D) of the downstream spectrometer inoperable. A new Step IV lattice without M1D and its optimization via a Genetic Algorithm (GA) will be described in this paper.

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TUPMY011

Simulated Measurements of Cooling in Muon Ionization Cooling Experiment

emittance, solenoid, detector, electron

1565

T.A. Mohayai
IIT, Chicago, Illinois, USA
C.T. Rogers
STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
P. Snopok
Fermilab, Batavia, Illinois, USA
P. Snopok
Illinois Institute of Technology, Chicago, Illlinois, USA

Cooled muon beams set the basis for the exploration of physics of flavour at a Neutrino Factory and for multi-TeV collisions at a Muon Collider. The international Muon Ionization Cooling Experiment (MICE) measures beam emittance before and after an ionization cooling cell and aims to demonstrate emittance reduction in muon beams. In the current MICE Step IV configuration, the MICE muon beam passes through low-Z absorber material for reducing its transverse emittance through ionization energy loss. Two scintillating fiber tracking detectors, housed in spectrometer solenoid modules upstream and downstream of the absorber are used for reconstructing position and momentum of individual muons for calculating transverse emittance reduction. However, due to existence of non-linear effects in beam optics, transverse emittance growth can be observed. Therefore, it is crucial to develop algorithms that are insensitive to this apparent emittance growth. We describe a different figure of merit for measuring muon cooling which is the direct measurement of the phase space density.

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TUPMY012

Hybrid Methods for Simulation of Muon Ionization Cooling Channels

simulation, experiment, emittance, scattering

1568

J.D. Kunz
IIT, Chicago, Illinois, USA
M. Berz, K. Makino
MSU, East Lansing, Michigan, USA
P. Snopok
Illinois Institute of Technology, Chicago, Illlinois, USA

Funding: Work is supported by the U.S. Department of Energy.
COSY Infinity is an arbitrary-order beam dynamics simulation and analysis code. It can determine high-order transfer maps of combinations of particle optical elements of arbitrary field configurations. New features are being developed for inclusion in COSY to follow the distribution of charged particles through matter. To study in detail some of the properties of muons passing through material, the transfer map approach alone is not sufficient. The interplay of beam optics and atomic processes must be studied by a hybrid transfer map–Monte Carlo approach in which transfer map methods describe the deterministic behavior of the particles in the accelerator channel, and Monte Carlo methods are used to model the stochastic processes intrinsic to liquid and solid absorbers. The advantage of the new approach is that the vast majority of the dynamics is represented by fast application of the high-order transfer map of an entire element and accumulated stochastic effects. The gains in speed are expected to simplify the optimization of muon cooling channels which are usually very computationally demanding. Progress on the development of the required algorithms is reported.

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TUPMY023

Advanced Gabor Lens Lattice for Laser Driven Hadron Therapy and Other Applications

laser, collimation, ion, cavity

1595

J.K. Pozimski, M. Aslaninejad, P.A. Posocco
Imperial College of Science and Technology, Department of Physics, London, United Kingdom

Funding: Funding was provided by the Imperial Confidence in Concept scheme.
The application of laser accelerated ion beams in hadron therapy requires a beam optics with unique features. Due to the spectral and spatial distribution of laser accelerated protons a compact ion optical system with therapy applications, based on Gabor space charge lenses for collecting, focusing and energy filtering the laser produced proton beam, has significant advantages compared with other setups. While a passive momentum selection could improve already the usability of laser driven hadron, we show that an advanced lattice utilizing additional RF cavities not only will deliver a momentum spread smaller than conventional accelerators, but also will increases the dose delivered. Furthermore, a possible near term application in the field of radio nuclide production is presented.

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TUPOR033

Experimental Study of Single Bunch Instabilities at NSLS-II Storage Ring

synchrotron, feedback, storage-ring, betatron

1738

W.X. Cheng, B. Bacha, G. Bassi, A. Blednykh, B. Podobedov, O. Singh, V. Smalyuk
BNL, Upton, Long Island, New York, USA

Single bunch instabilities have been observed since the early stage of NSLS-II storage ring commissioning. After installing the super-conducting cavity, the single bunch instability threshold current was similar at 0.7mA. The instability was eventually determined to be due to transverse mode coupling. Microwave instability has been characterized using streak camera bunch profile, horizontal beam sizes at dispersion location and beam spectrums. Microwave instability threshold current dependency on bunch lengths and IUV gaps has been studied. Most recent experimental results will be presented in this paper.

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TUPOY036

Diffusion and Thermal Stability of Implanted Hydrogen in ZnO Nanorods

proton, resonance, ion, radiation

1982

J.K. Park, Y.-S. Cho, H.-J. Kwon, K.T. Seol, S.P. Yun
Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea

Funding: This work has been supported through KOMAC operation fund of KAERI by Ministry of Science ICT and Future Planning of Korean Government.
The 20-MeV proton-beams with a fluence of 10¹² cm^-2 were irradiated on ZnO nanorods. The effects of proton-beam irradiation on ZnO nanorods are investigated by using ¹H nuclear magnetic resonance (NMR) spectroscopy. After irradiation, new and modified NMR resonance lines are observed in ¹H NMR spectra. The diffusion and thermal stability of each proton species are investigated from the lab- and rotating-frame spin-lattice relaxation data depending on temperature. Understanding the properties of thermally stable hydrogen species created by the beam irradiation may promise many possible applications, since the hydrogen stable up to high temperature only meets the device working conditions.

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WEXA01

The ESRF Low-emittance Upgrade

emittance, dipole, vacuum, radiation

2023

P. Raimondi
ESRF, Grenoble, France

This talk focuses on novel aspects of the lattice design, describes the technical solutions that have been found for meeting the design goals (including the use of permanent magnet dipoles), outlines the main challenges that will be faced in commissioning and operating the new lattice in a very demanding parameter regime, and discusses how it is hoped to maximize eventual benefits for users while minimizing disruption during the upgrade process.

Slides WEXA01 [23.005 MB]

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WEOAA02

On-axis Beam Accumulation Enabled by Phase Adjustment of a Double-frequency RF System for Diffraction-limited Storage Rings

injection, kicker, synchrotron, storage-ring

2032

G. Xu, J. Chen, Z. Duan, J. Qiu
IHEP, Beijing, People's Republic of China

Funding: Work supported by NSFC (Y4113G005C)
Future synchrotron light sources aim to achieve ultra- low emittances on both transverse planes, approaching or even reaching the diffraction limit of X-ray photon energies. These diffraction-limited storage rings (DLSRs) feature very strong lattice nonlinearities and thus very small dynamic aperture, which exclude off-axis injection schemes. In this paper, we propose a longitudinal on-axis injection scheme, which is based on a double-frequency RF system and in- dependently adjustment of the RF phase of each cavity to enable RF gymnastics. Such a scheme looks feasible with the state-of-art technology of fast injection kicker. Compari- son with other on-axis injection schemes is also discussed.

Slides WEOAA02 [1.712 MB]

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WEPMB056

CVD Deposition of Nb Based Materials for SRF Cavities

niobium, SRF, superconductivity, accelerating-gradient

2241

P. Pizzol, P. Chalker, T. Heil
The University of Liverpool, Liverpool, United Kingdom
O.B. Malyshev, S.M. Pattalwar, R. Valizadeh
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
G.B.G. Stenning
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom

Bulk niobium cavities are widely employed in particle accelerators to create high accelerating gradient despite their high material and operation cost. Advancements in technology have taken bulk niobium close to its theoretical operational limits, pushing the research to explore novel materials, such as niobium based alloys. Nitrides of niobium offer such an alternative, exhibiting a higher Tc compared to bulk niobium. Replacing then the niobium with a material with better thermal conductivity, such as copper, coated with thin films of nitrides in a multilayer S-I-S would lead to improved performance at reduced cost. Physical vapour deposition (PVD) is currently used to produce these coatings, but it suffers from lack of conformity. This issue can be resolved by using chemical vapour deposition (CVD), which is able to produce high quality coatings over surfaces with a high aspect ratio. This project explores the use of CVD techniques to deposit NbN thin films starting from their chlorinated precursors. The samples obtained are characterized via SEM, FIB, XRD, and EDX.

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WEPMW025

Optimizing the Design of Linear Non-scaling Fixed Field Alternating Gradient Arcs for the Electron Rings of eRHIC

radiation, synchrotron, synchrotron-radiation, electron

2475

J.S. Berg
BNL, Upton, Long Island, New York, USA

Funding: This manuscript has been authored by employees of Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy.
I describe a process for producing optimal linear non-scaling fixed field alternating gradient (FFAG) arc designs for the electron rings of eRHIC, an electron-ion collider in the RHIC tunnel at Brookhaven National Laboratory. The electrons are accelerated in two FFAG rings (low and high energy), which in addition to the arcs optimized here, contain straight sections, splitter/combiner sections, and a linac shared between the rings. The optimization process I use has two layers, an inner one meeting constraints and an outer optimization that minimizes a target function. The target function is an approximation to the FFAG arc cost, for which I give the function used and the basis for that choice. While reducing synchrotron radiation is important, I show that optimizing for synchrotron radiation alone leads to significant cost an performance penalties for the rest of the machine design for very little reduction in synchrotron radiation. I describe important constraints on the design, in particular minimum drift lengths, maximum and minimum tunes, and clearance from the beam to the beam pipe. Finally, I present possible eRHIC FFAG parameters resulting from this optimization.

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WEPMY010

Considerations for a Drive Beam Scheme for a Plasma Wakefield Linear Collider

plasma, collider, kicker, linac

2565

J. Pfingstner, E. Adli, C.A. Lindstrøm
University of Oslo, Oslo, Norway
E. Marín, D. Schulte
CERN, Geneva, Switzerland

The potential for high average gradients makes plasma wakefield acceleration (PWFA) an attracting option for future linear colliders. For a beam-driven PWFA collider a sequence of cells has to be supplied with synchronised drive beam bunches. This paper is concerned with the generation, transport and distribution of these drive beam bunches in a so-called drive beam complex for a 3 TeV collider. Based on earlier concepts, several modifications are suggested. The new design includes a superconducting linac and an optimised bunch delay system with a tree structure. To verify the feasibility for the overall complex, a lattice design and tracking studies for the critical bending arc subsystem are presented. Also the feasibility of a compact bunch separation system is shown. The result of these efforts is a drive beam complex that is optimised for construction cost and power efficiency that favours unified lattice solutions.

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WEPOR011

Lattice Matching with Elegant at ELSA

closed-orbit, dipole, quadrupole, simulation

2690

J.-P. Thiry, W. Hillert
ELSA, Bonn, Germany

The electron stretcher ring ELSA provides a beam of polarized electrons of up to 3.2 GeV energy. To preserve the initial degree of polarization, several depolarizing resonances have to be compensated during the fast energy ramp of 6 GeV/s. Beam depolarization, caused by crossing these resonances is studied using comprehensive numerical calculations. These depend essentially on a precise model of the actual magnetic field distributions, explicitly taking into account misalignments. Hence it is necessary to match the theoretical lattice to the actual accelerator. In a first step the alignment of all magnets has been examined and improved. This was done by using standard survey equipment and precise electronic spirit levels. In a second step the concept of response matrix fitting is used for further, beam based, lattice matching. Particle tracking and optics calculations are carried out using elegant, a fully 6D accelerator toolbox. Lattice matching is done by repeatedly calling elegant and utilizing a modified Levenberg-Marquardt optimizer. In this contribution we will describe our lattice fitting implementation.

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WEPOW003

Design Considerations of a 7BA-6BA Lattice for the Future Upgrade of SOLEIL

dipole, emittance, optics, sextupole

2815

R. Nagaoka, P. Brunelle, H.C. Chao, F.J. Cullinan, X.N. Gavaldà, A. Loulergue, A. Nadji, L.S. Nadolski, M.-A. Tordeux
SOLEIL, Gif-sur-Yvette, France

Previous studies indicated that adoption of a combination of 7 and 6BA cells in the existing SOLEIL ring enables reaching the target range of the horizontal emittance below 200 pm·rad as expected, in contrast to fewer dipole solutions such as a combination of 5 and 4BA studied earlier (IPAC 2014). However, the previous 7BA-6BA lattice resulted in having unacceptably strong gradients in quadrupoles and dipoles leading to high natural chromaticities. Several schemes that would allow for an improvement are explored, such as shortening the insertion device straight sections by one or two meters to create more space for the magnetic structure, lowering the dipole fields and the use of anti-bends as proposed by A. Streun. The effectiveness of each scheme is evaluated and the best combined use of them for SOLEIL is investigated. Ways to fulfil the constraints of the existing dipole beam lines are studied by introducing longitudinal gradient bends and/or multipole wigglers. The nonlinear optimisation to maximise the on and off-momentum apertures is made by using genetic algorithm-based numerical codes. A comparison of their performance and the obtained results are presented.

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WEPOW005

Updates on Lattice Modeling and Tuning for the ESRF-EBS Lattice.

injection, dipole, quadrupole, radiation

2818

S.M. Liuzzo, N. Carmignani, J. Chavanne, L. Farvacque, G. Le Bec, B. Nash, P. Raimondi, R. Versteegen, S.M. White
ESRF, Grenoble, France

The ESRF-EBS lattice model is updated to include the effect of magnetic lengths in dipoles, quadrupoles, sextupoles and combined function magnets. The effect of this modification and the updates to the injection cell are considered with particular focus on injection efficiency and Touschek lifetime. The solutions to introduce new sources of radiation suitable for the existing bending magnet radiation beamlines are also presented.

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WEPOW006

Hybrid Multi Bend Achromat at 3 GeV for Future 4th Generation Light Sources

emittance, sextupole, dynamic-aperture, dipole

2822

S.M. Liuzzo, D. Einfeld, L. Farvacque, P. Raimondi
ESRF, Grenoble, France

Starting from the Hybrid Multi Bend Achromat (HMBA) lattice designed for the 6GeV ESRF-EBS we rescale the lattice energy to 3GeV and optimize the lattice parameters to achieve dynamic apertures sufficient for injection and lifetimes of more than 7h without errors. The rescaling results to an emittance of roughly 140pmrad. Further optimizations of bending magnets longitudinal gradient, optics and sextupole fields show the possibility to further decrease emittance and increase the DA and lifetime. A comparison with other lattice designs is also presented.

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WEPOW016

Designing an Ultra Low Emittance Lattices for Iranian Light Source Facility Storage Ring

emittance, storage-ring, vacuum, scattering

2858

E. Ahmadi, M. Jafarzadeh, J. Rahighi
ILSF, Tehran, Iran
H. Ghasem
IPM, Tehran, Iran
S.M. Jazayeri
IUST, Narmac, Tehran, Iran

Electron storage rings are extensively used for high luminosity colliders, damping rings in high-energy physics and synchrotron light sources. To further increase the luminosity at the colliders or brightness of a synchrotron light sources, the beam emittance is being continually pushed downward. In this paper, we investigate the lattice design for the storage ring of Iranian Light Source Facility (ILSF) with an ultra-low emittance, intermediate energy of 3 GeV and circumference of 528 m. We present the design results for a five-band achromat lattice with the natural emittance of 276 pm-rad. The base line is based on 20 straight sections with the length of 7 m.

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WEPOW020

Present Status of KEK Photon Factory and Future Project

emittance, undulator, storage-ring, operation

2871

T. Honda, M. Adachi, S. Asaoka, K. Haga, K. Harada, Y. Honda, X.J. Jin, T. Kageyama, R. Kato, Y. Kobayashi, K. Marutsuka, T. Miyajima, H. Miyauchi, S. Nagahashi, N. Nakamura, K.N. Nigorikawa, T. Nogami, T. Obina, M. Ono, T. Ozaki, H. Sagehashi, H. Sakai, S. Sakanaka, H. Sasaki, Y. Sato, M. Shimada, T. Shioya, M. Tadano, T. Tahara, T. Takahashi, R. Takai, H. Takaki, O. Tanaka, Y. Tanimoto, K. Tsuchiya, T. Uchiyama, A. Ueda, K. Umemori, K. Watanabe, M. Yamamoto, N. Yamamoto, Ma. Yoshida, S.I. Yoshimoto
KEK, Ibaraki, Japan

Two synchrotron radiation sources of KEK, the PF-ring and the PF-AR, continue their user operation with various improvements. Scrap and build of the first generation undulators of 1980s at the PF-ring is pushed forward year by year. Five new elliptically polarized undulators have been installed in these five years, and we have also installed four very narrow-gap short-period undulators generating high brilliant X-ray. The new beam transport line that enables the 6.5-GeV full energy injection for PF-AR will be completed by the end of 2016 in order to make the top-up operation of the two SR sources compatible with the continuous injection for two main rings of the Super-KEKB. We have proposed a project of further upgrade of the 2.5-GeV PF-ring to improve its horizontal emittance as 8 nm rad using combined bending magnets at the arc sections. And we are also moving ahead on proposal of constructing a new KEK light source of an extremely low emittance as 0.3 nm rad. The progress and detail of our future project will be described in this paper.

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WEPOW021

The Low Emittance Reconstruction of the Arc Section of the Photon Factory

emittance, dynamic-aperture, photon, sextupole

2874

K. Harada, Y. Kobayashi, N. Nakamura, K. Oide, H. Sakai, S. Sakanaka
KEK, Ibaraki, Japan

The present horizontal emittance of the Photon Factory (PF) ring is about 35.4 nmrad. By the reconstruction of the normal cells at the arc section, the emittance can be reduced to about 8 nmrad. The double number of the combined function short bending magnets are adopted and one present normal cell become two new normal cells. Although the lattice of the straight sections are not changed, the optics are optimized to reduce the non-linear effects of the sextupoles of the arc sections. By keeping the tune advance of the straight section as 3 for the horizontal direction and 2.5 for the vertical, the dynamic aperture as large as that of the present ring can be achieved with the magnetic errors. The difference of the optics of the straight sections are so little that the beam injection and the operation of the in-vacuum short-gap undulators can be maintained. The hardware design will be began as the next step for the realization of the plan. In this proceedings, the design, optimization and simulation results for the low emittance lattice are shown.

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WEPOW025

Exploring the Ultimate Linear and Nonlinear Performance of the HEPS hybrid 7BA design

emittance, sextupole, storage-ring, optics

2883

Y. Jiao, G. Xu
IHEP, Beijing, People's Republic of China

The High Energy Photon Source (HEPS), a kilometre- scale diffraction-limited storage ring (DLSR) light source, with a beam energy of 5 to 6 GeV and transverse emittances of a few tens of pm.rad, is to be built in Beijing. We have obtained a hybrid 7BA lattice design, with a natural emittance of about 60 pm.rad and a circumference of about 1.3 kilometres, basically satisfying the requirement of on-axis longitudinal injection in HEPS. Nevertheless, it is interesting and necessary to explore the ultimate linear and nonlinear performance of the HEPS hybrid 7BA design. In this paper, we will introduce the multi-objective optimization with a successive and iterative implementation of the MOPSO and MOGA algorithms, and discuss certain relations between the nonlinear dynamics and linear optics of a hybrid MBA lattice. This study can provide reference for other DLSR lattice design and optimizations.

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WEPOW026

Recent Physical Studies for the HEPS Project

injection, booster, emittance, sextupole

2886

G. Xu, Z. Duan, Y.Y. Guo, D. Ji, Y. Jiao, X.Y. Li, Y.M. Peng, Q. Qin, J. Qiu, S.K. Tian, J.Q. Wang, N. Wang, Y. Wei, C.H. Yu
IHEP, Beijing, People's Republic of China

The High Energy Photon Source (HEPS), a kilometre- scale storage ring light source, with a beam energy of 5 to 6 GeV and transverse emittances of a few tens of pm.rad, is to be built in Beijing and now is under design. In this paper we reported the progress and status of the physical studies for the HEPS project, covering issues of storage lattice design and optimization, booster design, injection design, collective effects, error study, insertion device effects, longitudinal dynamics, etc.

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WEPOW027

Initial Lattice Design for Hefei Advanced Light Source: A VUV and Soft X-ray Diffraction-limited Storage Ring

sextupole, storage-ring, emittance, quadrupole

2889

Z.H. Bai, Q.K. Jia, W. Li, G. Liu, C.W. Luo, Q. Luo, L. Wang
USTC/NSRL, Hefei, Anhui, People's Republic of China

The upgrade project of Hefei Light Source was successfully completed in 2014 and has been operated for synchrotron radiation users since 2015, which is a second generation light source in the range of VUV and soft X-ray at NSRL in China. To meet the future requirements for users, more efforts are now putting at NSRL into the design of Hefei Advanced Light Source (HALS), a new VUV and soft-X ray diffraction-limited storage ring. The HALS storage ring will have an energy of 2 GeV and a natural emittance of about 50 pm·rad. This paper reports the initial lattice design studies, including linear optics design and nonlinear dynamics optimization.

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WEPOW036

Bunch Length Measurements with Passive Harmonic Cavities for Uniform Fill Patterns in a 100 MHz RF System

storage-ring, simulation, impedance, cavity

2914

T. Olsson, S.C. Leemann, P. Lilja
MAX IV Laboratory, Lund University, Lund, Sweden

The MAX IV facility includes two storage rings operated at 1.5 GeV and 3 GeV. Both rings make use of a 100 MHz RF system and are designed to operate with a uniform multibunch fill pattern as well as employ passive harmonic cavities to damp instabilities and increase Touschek lifetime. Recently, a discussion on timing modes at the MAX IV storage rings has been initiated by the user community. This implies operating the rings with other fill patterns than the originally planned multibunch mode and therefore detailed studies of the performance of the harmonic cavities are of interest. This paper presents bunch length measurements at the 100 MHz MAX II storage ring for uniform fill patterns. The purpose of the measurements was to evaluate the employed measurement method and simulation codes for future studies of fill patterns in the MAX IV storage rings.

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WEPOW038

Proposed Upgrade of the SLS Storage Ring

emittance, storage-ring, sextupole, optics

2922

A. Streun, M. Aiba, M. Böge, C. Calzolaio, M.P. Ehrlichman, A. Müller, A. Saá Hernández, H.S. Xu
PSI, Villigen PSI, Switzerland

A new storage ring is planned for the upgrade of the Swiss Light Source (SLS). It will replace the 12 triple bend achromats by twelve 7-bend achromats, which are based on low aperture longitudinal gradient bends (LGBs) and anti-bends (ABs), thus reducing the emittance from 5.0 nm to about 150 pm at 2.4 GeV while maintaining the source points of the undulator based beam lines. Sextupole and octupole strengths are determined using a multi-objective genetic algorithm (MOGA) and result in sufficient dynamic aperture for off-axis injection and several hours of Touschek lifetime. Superconducting LGBs of 5-6 T peak field will extend the photon range of the SLS up to 80-100 keV. The vacuum system will be based on a 20 mm inner diameter copper beam pipe with ante-chamber, and discrete getter pumps. It is planned to reuse the existing injector complex and the dynamically adjustable girder system.

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WEPOW044

Study of a Double Triple Bend Achromat (DTBA) Lattice for a 3 GeV Light Source

sextupole, optics, quadrupole, dipole

2940

A. Alekou, R. Bartolini
JAI, Oxford, United Kingdom
A. Alekou, R. Bartolini
Oxford University, Physics Department, Oxford, Oxon, United Kingdom
A. Alekou, R. Bartolini, T. Pulampong, R.P. Walker
DLS, Oxfordshire, United Kingdom
N. Carmignani, S.M. Liuzzo, P. Raimondi
ESRF, Grenoble, France

Starting from the concepts of the Hybrid Multi Bend Achromat (HMBA) lattice developed at ESRF and of the Double-Double Bend Achromat (DDBA) lattice developed at Diamond, we present a new cell that includes all the advantages of the two designs. The resulting Double Triple Bend Achromat (DTBA) cell allows for a natural horizontal emittance of less than 100 pm with a large dynamic aperture and lifetime. It includes two straight sections, for insertion devices, five and three meters long. The lattice is consistent with the engineering design developed for the ESRF-EBS lattice and the layout and user requirements of Diamond. The characteristics of the cell are presented together with the results of the optimisation process.

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WEPOW045

Concepts for a Low Emittance-High Capacity Storage Ring for the Diamond Light Source

emittance, photon, wiggler, dipole

2943

R. Bartolini, G. Cinque, G. Evans, K. Sawhney, J. Zegenhagen
DLS, Oxfordshire, United Kingdom

The Diamond Light Source is investigating several paths for a possible machine upgrade to Diamond II. The exercise is driven by by a joint assessment of the science capabilities opened by a very low emittance ring and the machine design that will underpin them. The consultation is made on a beamline-by-beamline basis and has highlighted a significant preference for lattices that combine both a low emittance and large capacity for IDs.

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WEPOW049

Physics Design Progress towards a Diffraction Limited Upgrade of the ALS

emittance, injection, brightness, dynamic-aperture

2956

C. Steier, J.M. Byrd, S. De Santis, H. Nishimura, D. Robin, F. Sannibale, C. Sun, M. Venturini, W. Wan
LBNL, Berkeley, California, USA

Funding: This work was supported by the Laboratory Directed Research and Development Program of Lawrence Berkeley National Laboratory under U.S. Department of Energy Contract No. DE-AC02-05CH11231.
Improvements in brightness and coherent flux of more than two orders of magnitude are possible using multi bend achromat lattice designs. These improvements can be implemented as upgrades of existing facilities, like the proposed upgrade of the Advanced Light Source. We will describe the progress in the physics design of this upgrade, including lattice evolution, error tolerance studies, simulations of collective effects, and intra beam scattering.

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WEPOW050

Optimization of the ALS-U Storage Ring Lattice

emittance, storage-ring, quadrupole, injection

2959

C. Sun, H. Nishimura, D. Robin, F. Sannibale, C. Steier, M. Venturini, W. Wan
LBNL, Berkeley, California, USA

Funding: Work supported by the Director Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231
The Advanced Light Source (ALS) at Lawrence Berkeley National Laboratory is proposing the upgrade of its synchrotron light source to reach soft x-ray diffraction limits within the present ALS footprint. The storage ring lattice design and optimization of this light source is one of the challenging aspects for this proposed upgrade. The candidate upgrade lattice needs not only to fulfill the physics design requirements such as brightness, injection efficiency and beam lifetime, but also to meet engineering constraints such as space limitations, maximum magnet strength as well as beamline port locations. In this paper, we will present the approach that we applied to design and optimize a multi-bend achromat based storage ring lattice for the proposed ALS upgrade.

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WEPOW053

CESR Lattice for Two Beam Operations with Narrow Gap Undulators at CHESS

undulator, injection, operation, simulation

2968

S. Wang, D. L. Rubin, J.P. Shanks
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA

Funding: Work was supported by NSF DMR-0936384 and NSF DMR-1332208.
CESR has operated as a dedicated light source since the conclusion of colliding beam program in 2008. Two undulators with a 6.5mm-vertical gap were installed in Fall 2014, replacing a wiggler in the sextant of CESR that is the home to all CHESS beam lines. In order to operate narrow gap undulators with two beams, CESR pretzel lattice was redesigned so that e^- and e⁺ orbits are coincident in one machine sextant but separated in return arcs. In particular both e^- and e⁺ orbits are on axis through undulators. This "arc-pretzel" lattice has been the basis for undulator operation. To better understand the beam dynamics and improve machine performance, we developed many simulation tools: undulator modeling, injection tracking, etc. With installation of an additional quadrupole near undulators, the CESR lattice will be further modified with a low beta waist in the insertion devices, allowing a more than two fold reduction of local beta functions. This reduction is anticipated to mitigate the effects of small aperture and undulator field errors and to enhance the xray brightness. The characterization of the lattice will be compared with measurements of injection efficiency, tune scans, etc.

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WEPOW056

Reproducibility of Orbit and Lattice at NSLS-II

quadrupole, operation, optics, storage-ring

2976

J. Choi, T.V. Shaftan
BNL, Upton, Long Island, New York, USA

Funding: DOE contract No: DE-SC0012704
In operating a high-end synchrotron light source, like NSLS-II, it is important to understand the machine accurately and have the ability to reproduce the desired machine state when needed. The obstacles, we can imagine, include the magnet hysteresis effect and some environmental effects. To minimize hysteresis effect, we cycle the magnets and it was proved working properly. On the other hand, from the point of long-term operation, we are not yet satisfied with the reproducibilities given by the same set of magnet currents and the machine needs additional tuning processes. In this paper, the experience of NSLS-II operation and studies are presented.

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WEPOY016

Use of Nonuniform Magnets for Emittance Reduction

emittance, dipole, simulation, radiation

3014

E.B. Levichev, G.N. Baranov, S.V. Sinyatkin
BINP SB RAS, Novosibirsk, Russia

We study a theoretical minimum emittance (TME) for a non-uniform bending magnet including a three-step bend (sandwich magnet), a dipole with linear ramp of the bend-ing radius and the same but with a central segment of constant field. We derive expression for the minimum emittance and expand it into a power series with respect to the bending angle. A zero-order term naturally gives the uniform magnet TME while higher-order terms are responsible for the emittance reduction. Theoretical re-sults are verified by numerical simulation.

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WEPOY040

Lattice Translation Between Accelerator Simulation Codes for Superkekb

solenoid, quadrupole, closed-orbit, optics

3077

D. Zhou, H. Koiso, A. Morita, Y. Ohnishi, K. Oide, H. Sugimoto
KEK, Ibaraki, Japan
M.E. Biagini
INFN/LNF, Frascati (Roma), Italy
N. Carmignani, S.M. Liuzzo
ESRF, Grenoble, France
D. Sagan
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA

To improve collaborative studies on beam dynamics for SuperKEKB between several labs, efforts have been made to translate the SAD lattices of SuperKEKB rings to the versions for other codes: AT, Bmad, MAD-X, and PTC. It turns out that lattice translations between these codes are not straightforward because of the complexity of the SuperKEKB lattices. In this paper, we describe our experiences of lattice translations, and present some results of benchmarks for the case of SuperKEKB.

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WEPOY051

Performance Optimization of Multi-particle Beam Dynamics Code IMPACT-Z on NVidia GPGPU

GPU, operation, linac, diagnostics

3110

Z.Q. He, G. Shen, Y. Yamazaki
FRIB, East Lansing, Michigan, USA
X. Wang
ICER, MSU, East Lansing, USA

Funding: The work is supported by the U.S. National Science Foundation , the U.S. Department of Energy Office of Science, the Institute for Cyber-Enabled Research, MSU.
Facility for Rare Isotope Beams is designed using a multiparticle tracking code IMPACT-Z. IMPACT-Z is originally for the purpose of accelerator design, so it is precise, however, quite time consuming, therefore usually not suitable for on-line beam tuning applications. IMPACT-Z is originally boosted using Message Passing Interface (MPI) technology. For single node mode, performance of IMPACT-Z is usually bounded by CPU performance, and for multimode mode, communication between MPI processes would become bottleneck. However, new emerging High Performance Computing (HPC) technology, like general-purpose graphics processing unit (GPGPU), brings new possibility in accelerating IMPACT-Z, so that the speed of IMPACT-Z satisfies for on-line beam tuning applications. This paper presents the efforts in exploring the capability of Nvidia GPGPU and the results of speed up of IMPACT-Z.

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WEPOY053

Comparison of Tracking Codes for the Determination of Dynamic Aperture in Storage Rings

dynamic-aperture, dipole, storage-ring, experiment

3114

R. Hipple, M. Berz
MSU, East Lansing, Michigan, USA

Funding: This work is supported by the U.S. Department of Energy under grant number DE-FG02-08ER41546
Currently there is a great deal of activity towards making precision measurements utilizing storage rings, for example the Muon g-2 experiment at Fermilab, and the Electric Dipole Moment (EDM) program of the JEDI Collaboration. These experiments are intended to perform measurements requiring sub-ppm precision. Of utmost importance in this regard is the ability of tracking codes to treat all nonlinear effects arising from the detailed field distributions present in the system, not the least of which are fringe fields. In previously published work,*,**, we performed parallel tests of various tracking codes in order to compare and contrast the results. In this study, we continue this line of research and extend the scope to parallel-faced dipoles and electrostatic dipoles.
* R.Hipple, M. Berz, Microscopy and Microanalysis 21 Suppl. 4 (2015)
** R. Hipple, M.Berz, MODBC3, ICAP 2015, in press.

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WEPOY054

A Matlab Interface Package for Elegant Simulation Code

booster, quadrupole, space-charge, betatron

3117

V.V. Smaluk, T.V. Shaftan, G.M. Wang
BNL, Upton, Long Island, New York, USA

Funding: Work supported by DOE contract DE-AC02-98CH10886
A Matlab interface package for Elegant simulation code is under development. This package combines advantages of Elegant, which is one of the most advanced codes for accelerator simulations, with advantages of useful and effective Matlab functions for data processing, analysis, optimization, and real-time machine control using Maltab Middle Layer. A number of functions have been already developed: calculation of lattice parameters and Twiss functions, linear and high-order chromaticity, amplitude-dependent tune shifts, modification of lattice elements, correction of betatron tunes and chromaticity, a set of functions for graphic representation. These functions have been successfully used at NSLS-II for tracking and turn-by-turn simulations near the half-integer resonance, for maximizing tunability and dynamic aperture of NSLS-II Booster, and for calculating limits of top-up Booster energy interlock.

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WEPOY055

NSLS-II Accelerator Commissioning and Transition to Operations

operation, storage-ring, vacuum, injection

3120

T.V. Shaftan
BNL, Upton, Long Island, New York, USA

Over past year NSLS-II has completed accelerator commissioning and enabled operations of first project beam lines. Recently we further optimized the NSLS-II accelerators, increased the beam current to 400 mA without- and to 250 mA with Insertion Devices (IDs), commissioned top-off mode of operations and stabilized beam orbit to below 10% of the beam size in the source points. In this paper we report progress on the NSLS-II accelerator commissioning and operations and plans for future facility developments.

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THPMB005

Notes on Steffen Parameters of Extended Fringe-Field Quadrupoles

quadrupole, focusing, real-time, optics

3226

V. Balandin, W. Decking, N. Golubeva
DESY, Hamburg, Germany

We consider some theoretical aspects of the Steffen hard-edge model of quadrupoles with extended fringe-fields and discuss possibilities of usage of this model in online beam dynamics applications.

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THPMB006

Unclosed Lattice Dispersions as a Tool for Partial Removal of Transverse to Longitudinal Beam Correlations

emittance, coupling, synchrotron, optics

3229

V. Balandin, W. Decking, N. Golubeva
DESY, Hamburg, Germany

We show how to choose unclosed lattice dispersions in order to zero either linear beam dispersions (linear correlations between energy of particles and their transverse positions and momenta) or linear beam tilts (linear correlations between longitudinal positions of particles and their transverse coordinates). Besides that, we prove that while removal of beam dispersions always leads to reduction of transverse projected emittances, zeroing of beam tilts cannot guarantee it.

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THPMB009

Model Driven Machine Improvement of COSY Based on ORM Data

quadrupole, optics, dipole, closed-orbit

3240

C. Weidemann, M. Bai, F. Hinder, B. Lorentz
FZJ, Jülich, Germany

The COoler SYnchrotron in Jülich accelerates and stores unpolarized and polarized proton or deuteron beams in the momentum range between 0.3 GeV/c and 3.65 GeV/c [*,**]. This, in combination with its diverse capabilities of phase space cooling and the flexibility of the lattice with respect to ion-optical settings makes COSY an ideal test facility for accelerator technology development. High demands on beam control and beam based measurements have to be fulfilled for future experiments such as the proposed precursor experiment for a direct measurement of the electric dipole moment of the deuteron (see [***] and references within). The analysis of measured orbit response matrices (ORM), which com- prise the focussing structure of the ring, allows for a better understand- ing of machine imperfections such as gradient errors and misalignments of quadrupole magnets. This contribution presents the development of a MAD-X based LOCO (Linear Optics from Closed Orbits) algorithm [****] in a C++ program aiming to calibrate and correct linear optics as well as improving beam control at COSY.
* R. Maier, NIM A 390, 1 (1997).
** S.A. Martin et al., NIM A 236, 249-255 (1985).
*** D. Eversmann et al. [JEDI Collaboration], Phys. Rev. Lett. 115, 094801 (2015).
**** J. Safranek, NIM A 388, 27 (1997).

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THPMB012

The HMBA Lattice Optimization for the New 3 GeV Light Source

brightness, emittance, storage-ring, injection

3251

K. Harada, M. Adachi, N. Funamori, T. Honda, Y. Kobayashi, N. Nakamura, K. Oide, H. Sakai, S. Sakanaka, K. Tsuchiya
KEK, Ibaraki, Japan

For the design study of the HMBA (hybrid multi bend achromat) type most advanced light source, the new storage ring was designed from the lattice of the phase II upgrade project of the ESRF (ESRF II). Although the original 3 GeV test lattice from Dr. Pantaleo Raimondi of ESRF has no problem about the optical and magnetic parameters including the dynamic aperture, we reduce the cell numbers and inserted the short straight sections for the in-vacuum short-gap undulators. After the optimization of the linear and non-linear optics as the original design principle of ESRF II, the altered lattice has the circumference of about 440 m with 16 HMBA cells, the emittance about 440 pm rad with the intra-beam scattering effect at the beam current of 500 mA, and the large dynamic aperture of about 2 cm at the injection point even with the usual magnetic errors.

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THPMB017

The Errors Study on a Recent Heps Low-Beta Design

optics, emittance, sextupole, quadrupole

3260

D. Ji, Y. Jiao, G. Xu
IHEP, Beijing, People's Republic of China

The next synchrotron light source High Energy Photon Source is currently studied at Beijing. A nominal design for the HEPS, in a hybrid 7BA lattice and with an emittance of 60 pm.rad in a circumference of 1.3 kilometers, is completed for further study. In this paper, we present some work on error effect based on the nominal lattice design. Topics covered include dynamic aperture and beam parameters affected by magnetic field error, systematic and random multipole errors and misalignment effect.

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THPMB018

Candidate Booster Design for the HEPS Project

emittance, booster, sextupole, injection

3263

Y.M. Peng, Y.Y. Guo, Y. Jiao, Y. Wei, G. Xu
IHEP, Beijing, People's Republic of China

The High Energy Photon Source (HEPS), with trans-verse emittances of a few tens of pm.rad, is to be built in the suburbs of Beijing, China. The HEPS booster is a 2 Hz electron synchrotron. It accelerates electron bunches from a 300 MeV linac to a final energy of 6 GeV, and then extracts and injects them into the stor-age ring. We have made a candidate booster design, with a circumference of about 432 m and a natural emittance of about 4 nm.rad at 6GeV, which will be located in a separate tunnel. This lattice has a four-fold symmetry. Each super-period is composed of 13 iden-tical cells and two matching cells. The lattice design and optimization and other considerations are present-ed in a detail.

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THPMB019

Comparing the Performance of MOGA and MOPSO in Optimization of the HEPS Performance

emittance, sextupole, quadrupole, storage-ring

3266

Y. Jiao, G. Xu
IHEP, Beijing, People's Republic of China

The High Energy Photon Source (HEPS), a kilometre- scale diffraction-limited storage ring light source, with a beam energy of 5 to 6 GeV and emittances of a few tens of pm.rad, is to be built in Beijing. A preliminary design with a hybrid 7BA lattice, an emittance of 60 pm.rad and a circumference of about 1.3 kilometers, has been made. Based on this design, we optimized the linear and nonlinear performance of the ring with the MOGA and MOPSO algorithms. From comparison of the performance of these two algorithms, it was found that MOPSO promises higher diversity than MOGA, while MOGA can reach better convergence than MOPSO. To reach a true Pareto front, a successive and iterative implementation of the PSO and MOGA, rather than using either of these two algorithms, is suggested.

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THPMB022

Direct and High Resolution Beta-Function Measurements for Storage Ring Lattice Characterization

quadrupole, betatron, storage-ring, closed-orbit

3272

W. Li, H. Hao, Y.K. Wu
FEL/Duke University, Durham, North Carolina, USA
W. Li, W. Xu
USTC/NSRL, Hefei, Anhui, People's Republic of China

Betatron functions are a set of commonly used merits to characterize the lattice performance of a circular accelerator. The betatron functions in many accelerators can be computed using a lattice model trained or calibrated using a set of closed orbit responses, which is exemplified by the widely used LOCO technique. However, for some accelerators, like Duke storage ring with quad-sextupole combined function magnets, LOCO cannot be employed in any straight forward manner. In this case, direct measurements for betatron function are required. One way to determine betatron functions at the location of quadrupoles for a circular accelerator is to use the relationship between the quadrupole strength variations and the corresponding betatron tune change. In this paper, we present a set of carefully developed techniques to accurately measure the betatron functions at the location of quadrupoles, which allow us to achieve extremely high accuracy. Measurement errors will be discussed, and the detailed measurement technique will be present. Finally, we'll report preliminary experimental results of beta function measurements in the Duke storage ring with statistical error on the order of 1%.

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THPMB023

Lattice Compensation of the Wiggler Effect in HLSII with Particle Swarm Optimization

wiggler, storage-ring, insertion, insertion-device

3275

G. Liu, L. Wang, K. Xuan
USTC/NSRL, Hefei, Anhui, People's Republic of China

The upgrade project of Hefei Light Source (HLSII) has successfully reduced the natural emittance of the electron beam to lower than 40 nm·rad at 800 MeV with five insertion devices installed. To provide enough straight sections for these insertion devices, the lattice structure has been changed to four double bend achromatic (DBA) with two super-periods from the former four triple bend achromatic (TBA). These different types of the insertion devices can greatly improve the performance of the light source, but simultaneously they can also influence the dynamics of the electron beam in the storage ring. Especially they can bring the distortion of the linear beam optics seriously. In order to make sure the stability and the quality of the beam meeting the design goal, the effect of these insertion devices must be compensated. In this paper, a direct compensation method is applied for the wiggler in the HLSII storage ring with the particle swarm optimization.

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THPMB024

Error Analysis for the Lattice of FELiChEM

FEL, undulator, simulation, emittance

3278

S. Huang, Z.G. He, W. Xu, S.C. Zhang, T. Zhang
USTC/NSRL, Hefei, Anhui, People's Republic of China

FELiChEM is a new experimental facility under construction at University of Science and Technology of China (USTC).The facility consists of the middle-infrared (MID-FEL) beam line for 2.5-50 um and the Far-infrared (FAR-FEL) beam line for 40-200um. To achieve the design FEL performance of IR-FEL, the beam with 30 mm-mrad emittance, 5 ps rms length and 1nC bunch charge is required. We conduct error analysis in order to evaluate the tolerances of machine parameters and alignments. In this paper, we simulate the orbit corrections and emittance growth under exist of misalignments and strength errors of magnets. The simulation results show that the trajectory errors can be corrected to mm levels in the whole lattice and the emittance increase is acceptable. At the entrance of undulator, the position and angular errors can be corrected very well. So the trajectory can be controlled in the undulator to meet the requirement of FEL.

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THPMB029

Simultaneous Two Beam Acceleration Lattice Design Study for the Post Linear Accelerator of RISP

ion, acceleration, emittance, simulation

3294

S.W. Jang
KNU, Deagu, Republic of Korea
E.-S. Kim
Korea University Sejong Campus, Sejong, Republic of Korea

The Rare Isotope Science Project, RISP, is the research complex by using heavy ion accelerator, which RISP research complex consists of front-end system, super conducting linear accelerator(SCL), ISOL system, In-fight system. The original purpose of post linear accelerator was for the alternative acceleration of stable driver beam from ECR ion source and unstable rare isotope beam from ISOL system. The new concept of acceleration method by using post accelerator lattice was studied to get more benefits. The idea was the simultaneous acceleration of stable driver beam and RI beam by using the average A/q value of post accelerator lattice. For the simultaneous two beam acceleration study, we used two ion beams the first one was 58Ni+8 and the other one was 132Sn+20. The beam dynamics simulation was performed by TRACK and TraceWin codes. In this poster, we will describe the results of beam dynamics study for the simultaneous two beam acceleration of the post linear accelerator of RISP.

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THPMB035

A Comparative Study of Low Energy Compact Storage Rings for a Thomson Scattering X-ray Source

storage-ring, scattering, emittance, dynamic-aperture

3308

L. Ovchinnikova, V.I. Shvedunov
SINP MSU, Moscow, Russia
E.G. Bessonov, M.V. Gorbunkov
LPI, Moscow, Russia
A.A. Mikhailichenko
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
V.I. Shvedunov
LEA MSU, Moscow, Russia

A low-energy (<50 MeV) compact storage ring is a basic component of an X-ray source with high average flux based on Thomson scattering. Such ring provides electron bunches with ~1 nC charge and repetition rate up to 100 MHz for interaction with intense laser pulses. Such ring should provide a small (tens of microns rms) beam radius at interaction point, must have large dynamic aperture, sufficient space for allocation of different elements, such as laser resonator, RF cavity, fast beam injection/extraction systems, beam pick-ups and correctors. In this report, we present the results of comparative study of four versions of storage ring with different structure of lattices.

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THPMB036

Model-Dependent Accelerator Lattice Fit Based on BPM Data and Generating Functions

sextupole, quadrupole, operation, alignment

3311

Yu. Maltseva, I.A. Morozov
BINP SB RAS, Novosibirsk, Russia

Obtaining accurate linear and nonlinear accelerator models is critical for routine accelerator operation. Here we consider a method based on BPM data and generating functions that provides fitted accelerator model. Using measurements from at least three BPMs and generating functions between them allows obtaining momenta at BPMs as the functions of model parameters and comparing them. Thus, lattice parameters can be fitted. Theoretical results are presented and the method is applied to the model examples.

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THPMB045

Comparison of Optics Measurement Methods in ESRF

optics, storage-ring, sextupole, dipole

3343

L. Malina, J.M. Coello de Portugal, A. Langner, T. Persson, P.K. Skowroński, R. Tomás
CERN, Geneva, Switzerland
L. Farvacque, A. Franchi
ESRF, Grenoble, France

The N-BPM and the Amplitude methods, which are used in the LHC for beam optics measurement, were applied to the ESRF storage ring. We compare the results to the Orbit Response Matrix (ORM) method that is routinely used in the ESRF. These techniques are conceptually different since the ORM is based on the orbit response upon strength variation of steering magnets while the LHC techniques rely on the harmonic analysis of turn-by-turn position excited by a kicker or an AC dipole. Finally, we compare these methods and show the differences in their performance in the ESRF environment.

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THPMB049

Optics Calibration During Commissioning of the Taiwan Photon Source

optics, quadrupole, coupling, emittance

3357

F.H. Tseng, C.H. Chen, J.Y. Chen, M.-S. Chiu, C.-C. Kuo, Y.-C. Liu, H.-J. Tsai
NSRRC, Hsinchu, Taiwan

The Taiwan Photon Source is a 3-GeV low emittance synchrotron light machine with circumference of 518.4m. The lattice is with 24-cell DBA structure and emittance is 1.6 nm-rad. During the commissioning in the past year, we employed MATLAB-based high level applications to calibrate the optical functions in three different operation lattice modes. In particular, we used LOCO (Linear Optics from Closed Orbit) to restore the machine optical functions and reduce emittance coupling ratio. The beam-based alignment (BBA) measurements as well as BPM and corrector errors were identified.

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THPMB050

The Commmissioning of Phase-I Insertion Devices in TPS

storage-ring, coupling, undulator, radiation

3360

M.-S. Chiu, C.H. Chang, C.H. Chen, J. Chen, J.Y. Chen, Y.-S. Cheng, P.C. Chiu, P.J. Chou, T.Y. Chung, S. Fann, K.H. Hu, C.H. Huang, J.C. Huang, C.-S. Hwang, C.-C. Kuo, T.Y. Lee, C.C. Liang, Y.-C. Liu, H.-J. Tsai, F.H. Tseng, C.Y. Wu
NSRRC, Hsinchu, Taiwan

The Taiwan Photon Source (TPS) is a low-emittance 3-GeV light source at Natioal Synchrotron Radiation Research Center, next to the Taiwan Light source (1.5 GeV). On March 26, 2015, the TPS storage ring with two 5-cell PETRA cavities has successfully operated in 100 mA in top-up mode without the installation of insertion devices (IDs). To reach the design goal of 500 mA, the machine was shut down for 5 months to replace PETRA cavitites with superconducting RF (SRF) cavities and to install 10 IDs: 7 in-vacuum undulators (IU) and 3 elliptically polarized undulators (EPU). The commissioning of TPS storage ring with SRF cavities and IDs began in Sep. 2015. In this paper, we present our results and proceedures of ID commissioning.

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THPMB053

nuSTORM FFAG Decay Ring

resonance, factory, storage-ring, closed-orbit

3369

J.-B. Lagrange, J. Pasternak
Imperial College of Science and Technology, Department of Physics, London, United Kingdom
R.B. Appleby, J.M. Garland, H.L. Owen, S.C. Tygier
UMAN, Manchester, United Kingdom
R.B. Appleby
Cockcroft Institute, Warrington, Cheshire, United Kingdom
A.D. Bross, A. Liu
Fermilab, Batavia, Illinois, USA
J. Pasternak
STFC/RAL, Chilton, Didcot, Oxon, United Kingdom

The neutrino beam produced from muons decaying in a storage ring would be an ideal tool for precise neutrino cross section measurements and search for sterile neutrinos due to its precisely known flavour content and spectrum. In the proposed nuSTORM facility pions would be directly injected into a racetrack storage ring, where circulating muon beam would be captured. The storage ring has two options: a FODO solution with large aperture quadrupoles and a racetrack FFAG (Fixed Field Alternating Gradient) using the recent developments in FFAGs. Machine parameters, linear optics design and beam dynamics are discussed in this paper.

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THPMB054

FFAG Beam Line for nuPIL - Neutrinos from PIon Beam Line

proton, target, detector, experiment

3372

J.-B. Lagrange, J. Pasternak
Imperial College of Science and Technology, Department of Physics, London, United Kingdom
R.B. Appleby, S.C. Tygier
UMAN, Manchester, United Kingdom
R.B. Appleby
Cockcroft Institute, Warrington, Cheshire, United Kingdom
A.D. Bross, A. Liu
Fermilab, Batavia, Illinois, USA
J. Pasternak
STFC/RAL, Chilton, Didcot, Oxon, United Kingdom

The Long Baseline Neutrino Facilities (LBNF) program aims to deliver a neutrino beam for the Deep Underground Neutrino Experiment (DUNE). The current baseline for LBNF is a conventional magnetic horn and decay pipe system. Neutrinos from PIon beam Line (nuPIL) is a part of the optimization effort to optimize the LBNF. It consists of a pion beam line after the horn to clean the beam of high energy protons and wrong-sign pions before transporting them into a decay beam line, where instrumentation could be implemented. This paper focuses on the FFAG solution for this pion beam line. The resulting neutrino flux is also presented.

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THPMB055

A FODO Beam Line Design for nuPIL

dipole, optics, detector, proton

3375

A. Liu, A.D. Bross
Fermilab, Batavia, Illinois, USA
J.-B. Lagrange
Imperial College of Science and Technology, Department of Physics, London, United Kingdom

Funding: Fermi National Accelerator Laboratory
The Fermilab Deep Underground Neutrino Experiment (DUNE) was proposed to determine the neutrino mass hierarchy and demonstrate leptonic CP violation. The current design of the facility that produces the neutrino beam (LBNF) uses magnetic horns to collect pions and a decay pipe to allow them to decay. In this paper, a design of a possible alternative for the conventional neutrino beam in LBNF is presented. In this design, a FODO magnet beam line is used to collect the pions from the downstream face of a horn, bend them by ∼ 5.8 degrees and then transport them in a straight beam line where they decay to produce neutrinos. The idea of using neutrinos from the PIon beam Line (nuPIL) provides flavor-pure neutrino beams that can be well understood by implementing standard beam measurement technology. The neutrino flux and the resulting δ_CP sensitivity from the FODO nuPIL are also presented in the paper.

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THPMR002

Optics Corrections with LOCO in the Fermilab Booster

optics, booster, sextupole, quadrupole

3385

C.-Y. Tan, L.R. Prost, K. Seiya, A.K. Triplett
Fermilab, Batavia, Illinois, USA

Funding: Operated by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy.
The optics of the Fermilab Booster has been corrected with LOCO (Linear Optics from Closed Orbits). However, the first corrections did not show any improvement in capture efficiency at injection. A detailed analysis of the results showed that the problem lay in the MADX optics file. Both the quadrupole and chromatic strengths were originally set as constants independent of beam energy. However, careful comparison between the measured and calculated tunes and chromatcity show that these strengths are energy dependent. After the MADX model was modified with these new energy dependent strengths, the LOCO corrected lattice has been applied to Booster. The effect of the corrected lattice will be discussed here.

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THPMR005

Systematic Errors Investigation in Frozen and Quasi-Frozen Spin Lattices of Deuteron EDM Ring

sextupole, storage-ring, dipole, experiment

3394

V. Senichev, B. Lorentz
FZJ, Jülich, Germany
S.N. Andrianov, A.N. Ivanov
St. Petersburg State University, St. Petersburg, Russia
M. Berz, E. Valetov
MSU, East Lansing, Michigan, USA
S. Chekmenev, J. Pretz
RWTH, Aachen, Germany

The search for the electric dipole moment (EDM) in the storage ring raises two questions: how to create conditions for maximum growth of the total EDM signal of all particles in bunch, and how to differentiate the EDM signal from the induced magnetic dipole moment (MDM) signal. The T-BMT equation distinctly addresses each issue. Because the EDM signal is proportional to the projection of the spin on the direction of the momentum, it is desirable to freeze the spin direction of all particles in a bunch along momentum. It can be successfully implemented in the Quasi Frozen (QFS) and Frozen (FS) Spin structures. However, in case of magnet misalignments, the induced MDM signal may arise in the same plane as the EDM signal and thereby prevent its registration. In this paper, we analyze the effect of errors together with the spin-tune decoherence of all particles in the bunch for FS and QFS options.

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THPMR008

Experimental Crosscheck of Algorithms for Magnet Lattice Correction

betatron, optics, quadrupole, storage-ring

3400

V.V. Smaluk, W. Guo, Y. Hidaka, Y. Li, G.M. Wang, L. Yang, X. Yang
BNL, Upton, Long Island, New York, USA

Funding: Work supported by DOE contract DE-AC02-98CH10886
Performance, capabilities and limitations of various algorithms for linear magnet optics correction have been studied experimentally at NSLS-II. For the crosscheck, we have selected 4 algorithms based on turn-by-turn beam position analysis: weighted correction of betatron phase and amplitude, independent component analysis, model-independent analysis, and driving-terms-based linear optics characterization. A LOCO algorithm based on closed orbit measurement has been used as a reference. For the correction, either iterative solving of linear problem (matrix inversion with singular-value decomposition) or variational optimization has been used. For all the algorithms, accuracy limitations and convergence of linear lattice correction are discussed.

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THPMR012

Optimization of Nonlinear Dynamics for Sirius

sextupole, dynamic-aperture, optics, betatron

3409

F.H. de Sá, L. Liu, X.R. Resende
LNLS, Campinas, Brazil

In this work we describe the optimization of the non-linear dynamics for the Sirius storage ring. The strong sextupoles of the lattice, necessary to correct the linear chromaticities, generate higher order terms in the tune-shifts with amplitude and energy, which may result in a large tune footprint for the machine. The configuration the sextupole families found that wraps this tune footprint and thus avoids dangerous resonances was achieved with minimization of Hamiltonian driving terms and tracking-based multi-objective algorithms include realistic values of misalignment and excitation errors of the magnets, orbit correction, insertion devices fields and real vacuum chamber apertures.

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THPMR013

A New Optics for Sirius

dipole, emittance, optics, quadrupole

3413

L. Liu, X.R. Resende, F. H. de Sá
LNLS, Campinas, Brazil

We report on the latest optics modifications for the 3 GeV Sirius electron storage ring presently under construction at the Brazilian Synchrotron Light Laboratory, LNLS. Although the basic parameters are set and frozen, improvements in the magnetic lattice and beam optics are still being implemented. In particular, the central dipole in the 5BA cell has been replaced by an all-permanent-magnet dipole with a thin superbend in the center with peak magnetic field of 3.2 T and the operation mode has now symmetry 5, with 15 low βx straight sections and 5 high βx sections. The 3 GeV ring bare lattice emittance is now 0.25 nm.rad.

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THPMR016

Horizontal Phase Space Shaping for Optimized Off-axis Injection Efficiency

injection, sextupole, optics, septum

3424

S.M. White, S. Lagarde, S.M. Liuzzo, B. Ogier, T.P. Perron, P. Raimondi
ESRF, Grenoble, France

With the introduction of top-up operation at the ESRF it becomes important to reduce as much as possible any kind of perturbation seen by the users during injection. For this purpose, a novel technique to improve injection efficiency by shaping the horizontal beam phase space to better match the storage ring acceptance and hence reduce the duration of injections was developed. Theoretical concept, simulations and first experimental results are presented.

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THPMR021

Bmad Model of COSY, Status and Progress

sextupole, proton, polarization, resonance

3437

Y. Dutheil
FZJ, Jülich, Germany

Abstract The COSY in Jülich is a versatile machine with a long history of polarized proton acceleration. A new model of COSY based on the Bmad library was developed to simulate beam and spin dynamics. Original methods of lattice design, notably multi-objective lattice optimization, were explored. This contribution presents the status and development steps of the Bmad model of COSY. Some of the latest simulations will also be discussed.

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THPMR022

Non-linear Optimization of Storage Ring Lattice for the SPring-8 Upgrade

sextupole, betatron, optics, injection

3440

K. Soutome, K.K. Kaneki, Y. Shimosaki, M. Takao
JASRI/SPring-8, Hyogo-ken, Japan
H. Tanaka
RIKEN SPring-8 Center, Sayo-cho, Sayo-gun, Hyogo, Japan

A project of upgrading the SPring-8 facility is ongoing to convert the present storage ring to a high-coherence hard X-ray source (SPring-8-II). To achieve the emittance value of less than 0.2 nmrad at 6 GeV, we adopted a 5-bend achromat lattice with dipoles having longitudinal field gradient. In this lattice the betatron phase between the two dispersion arcs was set to (2n+1)PI to suppress dominant harmful effects of chromaticity-correcting sextupoles. By detuning this phase, optimizing sextupole strengths in a cell and introducing octupoles, we obtained a sufficient dynamic aperture (DA) for beam injection even for the symmetry-broken ring having four long straight sections and a high-beta injection section. However, the off-momentum behavior such as the non-linear chromaticity still needs to be optimized to achieve the momentum acceptance (MA) of 3% or larger. We have thus been investigating the possibility to increase both the DA and MA by introducing several phase-matched sextupole pairs. The presentation will report the obtained results by this approach.

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reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMR022

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THPMR031

Turn-by-Turn Measurements for Beam Dynamics at Vepp-5 Damping Ring

impedance, damping, betatron, vacuum

3452

M.F. Blinov, K.V. Astrelina, V.V. Balakin, O.I. Meshkov, A.A. Starostenko
BINP SB RAS, Novosibirsk, Russia
V.L. Dorokhov
BINP, Novosibirsk, Russia

Preinjector complex VEPP-5 is being constructed for high rate production and acceleration of electrons and positrons beams up to energy 510 MeV. Both kinds of particles accumulated in the damping ring and after achieving of needed intensity the beams would be transported alternatively to VEPP-3/VEPP-4M or to BEP/VEPP-2000 colliders. At this paper basic parameters of damping ring presented. All measurements were carried out for electron beam with energy 385 MeV. For turn-by-turn measurements 12 beam position monitors were used. In order to improve precision of measured value NAFF algorithm was applied. For measurements of longitudinal beam profile optical phi-dissector was used.

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reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMR031

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THPMR032

Dynamical Aperture Control in Accelerator Lattices With Multipole Potentials

controls, multipole, resonance, octupole

3455

I.A. Morozov, E.B. Levichev
BINP SB RAS, Novosibirsk, Russia

We apply two analytical methods to control accelerator dynamic aperture (DA) with multipole potentials. Both methods assume that accelerator model can be represented as a product of unperturbed and perturbed exponential operators with exponent of perturbed operator given as formal power series in perturbation parameter and known dependence of series coefficients on lattice parameters such as multipole strength distribution. Normal form method can be applied to the above representation and then lattice parameters are used to control normal form Hamiltonian coefficients. Hamiltonian control can be used to compute control term and lattice parameters are then fitted to approximate corresponding controlled operator. Theoretical results as well as model examples are presented.

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reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMR032

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THPMR035

Low Horizontal Beta Optics for ALBA

optics, sextupole, dynamic-aperture, emittance

3461

G. Benedetti, J. Campmany, Z. Martí
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain

The ALBA insertion device beamlines have a horizontal and vertical rms source size of 130 and 5.5 microns. Protein crystallography beamlines (Xaloc) would benefit from a reduction of the horizontal and increase of the vertical beam size, to gain spatial resolution and avoid anisotropy effects. A modified lattice with horizontal and vertical beam size of 74 and 9 microns has been setup and tested, breaking the ring symmetry, with different setting of the six neightbouring quadrupoles at each side of the Xaloc insertion device. Such configuration keeps the nominal emittance almost unvaried and the working point is recovered by small changes in the quadrupole strengths of the four symmetric matching sections. A dedicated setting of the nine available sextupole families has been obtained by numerical optimization of the dynamical apertures and tune shifts. The lattice settings have been satisfactorily tested. The measured lifetime is reduced a factor two and the injection efficiency decreases to 60%. Finally, the option of increasing the number of sextupole families, to recover the dynamic aperture and guarantee the injection efficiency, has been studied.

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THPMR041

Implementation of High Order Symplectic Integrators with Positive Steps in Tracking Programs

quadrupole, multipole, storage-ring, dipole

3484

K. Skoufaris, Y. Papaphilippou
CERN, Geneva, Switzerland
J. Laskar
IMCCE, Paris, France
Ch. Skokos
University of Cape Town, Cape Town, South Africa

The symplectic integrators CSABAν & CSBABν are used in order to calculate single particles dynamics in accelerators and storage rings. These integrators present only positive steps and can be accurate up to the high order. They are compared with already existing splitting methods of MAD-X with respect to their impact on various beam dynamics quantities, for different beam elements.

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reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMR041

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THPMR045

CLIC Beam Delivery System Rebaselining and Long L* Lattice Optimization

luminosity, sextupole, synchrotron-radiation, radiation

3500

F. Plassard, D. Schulte, R. Tomás
CERN, Geneva, Switzerland
P. Bambade
LAL, Orsay, France

This paper summarizes the re-optimization study made on the CLIC Beam Delivery System (BDS) in the framework of the rebaselining for beam collisions at 380 GeV for the initial energy stage. It describes the optimization process applied for the beam parameters as well as for the Final Focus system (FFS) lattice design with respect to the energy upgrade transition to 3 TeV. Both initial and final energy stages were optimized for a short (nominal) and a long L* (6 meters). The long L* option allows the last quadrupole (QD0) to be be located outward of the detector solenoid field influence. FFS optics designs based on the Local chromaticity correction and performance comparisons for both L* options are shown.

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THPMR050

Studies to Install a Multipole Wiggler by Removing a Chromatic Sextupole in the Diamond Storage Ring

sextupole, injection, optics, emittance

3518

B. Singh, M. Apollonio, R. Bartolini, E. Koukovini-Platia, I.P.S. Martin, T. Pulampong, R.P. Walker
DLS, Oxfordshire, United Kingdom
R. Bartolini
JAI, Oxford, United Kingdom

Investigations are underway for the possible use of an achromat to install a short multipole wiggler by removing a chromatic sextupole in cell-11 of the storage ring. The effect on emittance and energy spread are found to be small, however the impact on lifetime and injection are very significant if the chromaticity is corrected normally (globally). The MOGA genetic algorithm is used to optimize the lifetime and injection efficiency in this case. We used local mirror chromatic sextupole and other chromatic sextupole family for chromaticity correction in which case the genetic algorithm found solution that restores lifetime and injection efficiency. In this paper the results of MOGA simulations using various schemes for chromaticity correction and test results in presently operational optics will be discussed.

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THPOR001

Tolerance Studies and Dispersion Free Steering for Extreme Low Emittance in the FCC-ee Project

emittance, collider, sextupole, interaction-region

3759

S. Aumon, A. Doblhammer, B. Härer, B.J. Holzer
CERN, Geneva, Switzerland
B. Härer
KIT, Karlsruhe, Germany
K. Oide
KEK, Ibaraki, Japan

The FCC-ee study is investigating the design of a 100 km e⁺/e⁻ circular collider for precision measurements and rare decay observations in the range of 90 to 350 GeV center of mass energy with luminosities in the order of 10³⁵ cm^-2s^-1. In order to reach such performances, an extreme focusing of the beam is required in the interaction regions with a low vertical beta function of 2 mm at the IP. Moreover, the FCC-ee physics program requires very low emittances never achieved in a collider with 2 nm for ε_x and 2 pm for ε_y, reducing the coupling ratio to 1/1000. With such requirements, any field errors and sources of coupling will introduce spurious vertical dispersion which degrades emittances, limiting the luminosity of the machine. This paper describes the tolerance study and the impact of errors will affect the vertical emittance. In order to preserve the FCC-ee performances, in particular ε_y, a challenging correction scheme is proposed to keep the coupling and the vertical emittance as low as possible.

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THPOR002

Chromaticity Compensation Schemes for the Arc Lattice of the FCC-ee Collider

sextupole, collider, quadrupole, optics

3763

B. Härer
KIT, Karlsruhe, Germany
A. Doblhammer, B.J. Holzer
CERN, Geneva, Switzerland

FCC-ee is an 100 km e⁺/e⁻ collider that is being designed within the Future Circular Collider Study organised by CERN. It's layout is optimised for precision studies and rare decay observations in the range of 90 to 350 GeV center of mass energy with luminosities in the order of 10³⁵ cm^-2s^-1. Extremely small vertical beta functions of 1 - 2 mm are required at the two interaction points to reach this goal. The strong focusing required in the final doublet quadrupoles drives the chromaticity to more than -2000 units, far beyond the values that had been achieved in previous storage rings. As a consequence a pure linear chromaticity compensation scheme will not be sufficient to obtain the required ± 2 % energy acceptance. A state of the art multi-family sextupole scheme will have to be combined with a local chromaticity correction. This paper presents the design of the arc lattice, optimised for highest momentum acceptance and the results of systematic studies of the sextupole scheme in the arcs in order to gain highest chromaticity performance.

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THPOR003

Tapering Options and Emittance Fine Tuning for the FCC-ee Collider

dipole, quadrupole, optics, synchrotron

3767

B. Härer, A. Doblhammer, B.J. Holzer
CERN, Geneva, Switzerland

The lepton collider version of the FCC study describes a future electron-positron collider with a circumference in the order of 100 km, optimised for operation with collision energies in the range of 90 GeV to 350 GeV (FCC- ee). This paper presents the layout of the machine and the constraints on the design of the arc lattice in the context of the four different beam energies that are foreseen for beam operation. Special emphasis is put on the compensation of the effect of the strong synchrotron radiation losses. The beam orbit as well as the optics have to be re-optimised for a given operation energy in order to achieve the foreseen emittance of ε = 1 nm in the horizontal and 1 pm in the vertical plane. Counter measures of the so-called saw-tooth effect of the design orbit are needed as well as a compensation of the energy loss on the beam optics. The paper summarizes different scenarios of how to achieve this goal as well as the need for additional emittance fine tuning using wiggler magnets.

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THPOR009

Cepc Partial Double Ring Lattice Design

dynamic-aperture, dipole, luminosity, factory

3785

F. Su
Institute of High Energy Physics (IHEP), People's Republic of China
S. Bai, T.J. Bian, Z. Duan, J. Gao, H. Geng, D. Wang, Y. Wang, M. Xiao, G. Xu, Y. Zhang
IHEP, Beijing, People's Republic of China

In this paper, we introduced the layout and lattice design of Circular-Electron-Positron-Collider (CEPC) partial double ring (PDR) scheme. The baseline design of CEPC is a single beam-pipe electron positron collider, which has to adopt pretzel orbit scheme. And it is not suitable to serve as a high luminosity Z factory. If we choose partial double ring scheme, we can get a higher luminosity with lower power and be suitable to serve as a high luminosity Z factory. In this paper, we discussed the details of CEPC partial double ring lattice design and showed the dynamic aperture study and optimization.

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THPOR013

Magnet Error Effect on Dynamic Aperture in CEPC

dynamic-aperture, multipole, quadrupole, sextupole

3798

S. Bai, J. Gao, Y. Wang, D.J. Xiao
IHEP, Beijing, People's Republic of China

With the discovery of the higgs boson at around 125GeV, a circular higgs factory design with high luminosity (L ~ 1034 cm^-2s⁻¹) is becoming more popular in the accelerator world. The CEPC project in China is one of them. The performance of the machine can be influenced by the existence of every kind of inaccuracies of the magnets, such as misalignment errors and field errors, multipole errors etc on. In this paper, we reported the errors that used in the CEPC beam dynamic study, and the influence on dynamic aperture of the CEPC main ring when introducing these kinds of errors.

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THPOR017

Dynamic Aperture Optimization at CEPC with Pretzel Orbit

dynamic-aperture, dipole, quadrupole, collider

3808

H. Geng, S. Bai, X. Cui, Z. Duan, J. Gao, Y.Y. Guo, Y.M. Peng, Q. Qin, D. Wang, N. Wang, Y. Wang, G. Xu, Y. Yue, Y. Zhang
IHEP, Beijing, People's Republic of China
W. Chou
Fermilab, Batavia, Illinois, USA
F. Su
Institute of High Energy Physics (IHEP), People's Republic of China

A preliminary design of the CEPC ring with pretzel orbit will be presented. The ring and pretzel orbit will be designed for 50 bunches, as required in the CEPC Pre-CDR. The linear optics, as well as the non-linear chromaticity compensation with the presence of pretzel orbit will be described. Different phase advance difference between the long and short straight sections, have been tried to optimize the dynamic aperture, the results will be shown in this paper.

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THPOR019

Momentum Acceptance Optimization in FCC-ee Lattice (CERN)

sextupole, quadrupole, luminosity, dipole

3814

A.V. Bogomyagkov, E.B. Levichev
BINP SB RAS, Novosibirsk, Russia

Funding: Work is supported by the Ministry of Education and Science of the Russian Federation.
The part of the ongoing study of the future circular collider (FCC) is an electron positron machine with center of mass energy from 90 to 350 GeV. Crab waist collision scheme and small (1 mm) vertical beta function at the interaction point (IP) provide superior luminosity. At the top energy, radiation in the field of the opposite bunch (beamstrahlung) limits the beam lifetime and therefore achievable luminosity. Beamstrahlung influence depends on momentum acceptance of the lattice, the value of 2% provides acceptable lifetime. The small value of vertical beta function enhances effects of nonlinear chromaticity. The present work describes principles used in design and optimization of FCC-ee momentum acceptance optimization and are based on chromatic variations of beta function.

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THPOY005

Virtual Accelerator System for Online and Offline Simulations

controls, EPICS, operation, synchrotron

4094

S. Ma, C. Li, G. Liu, J.G. Wang, W. Xu, K. Xuan
USTC/NSRL, Hefei, Anhui, People's Republic of China

Synchrotron radiation light sources have been becoming import scientific tools in various research areas. To build a state-of-the-art synchrotron radiation light source, one need to carefully study the linear and nonlinear dynamics of the charged beam in each of the light source components, such as the linac, transfer line, booster synchrotron and storage ring. There are many mature software tools, including MAD, elegant and Accelerator toolkit (AT), can be used to accomplish these tasks. In order to achieve a high performance light source, up-to-date technologies are adopt to build various subsystems. The integration of these subsystems need to be fully tested before the light source is operated. However, there lacks of a good software to perform this work. The virtual light source (VLS), a software based upon EPICS and AT, is developed at the National Synchrotron Radiation Laboratory (NSRL) to fulfill this purpose. This paper presents the details of this software. Some critical applications are also illustrated.

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THPOY021

NSLS-II Dedicated Python Tools for Simulation and Analysis

closed-orbit, quadrupole, simulation, controls

4134

J. Choi
BNL, Upton, Long Island, New York, USA

Funding: DOE contract No: DE-SC0012704
Python is a high-level interpreted programming language. Despite its slow benchmarks, because of its fast coding cycle and dynamic property, the users are increasing fast in all areas. Also, because it does not need special care for the memory management, both professional and non-professional programmers can easily make bug-free code just by concentrating on logics. Furthermore, fast increasing libraries are making the language more and more useful. With these advantages, we developed python tools which simulate and analyze the particle accelerator with some parts being dedicated to NSLS-II operation.

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THPOY022

Database Development for NSLS-II Accelerator Data Management

database, operation, interface, status

4137

J. Choi, T.V. Shaftan
BNL, Upton, Long Island, New York, USA

Funding: DOE contract No: DE-SC0012704
NSLS-II is developing a database which will be used for the accelerator data management. The information related to the operation is the main target at this stage. Also, various documents are being collected to provide easy access and installing workflow management is under consideration. The database will have web-based interfaces to communicate with the users. This paper overviews the database structures and required functionalities.

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