Keyword: sextupole
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MOODB102 Multiple Function Magnet Systems for MAX IV dipole, multipole, quadrupole, octupole 34
 
  • F. Bødker, C.E. Hansen, N. Hauge, E.K. Krauthammer, D. Kristoffersen, G. Nielsen, C.W.O. Ostenfeld, C.G. Pedersen
    Danfysik A/S, Taastrup, Denmark
  
  Danfysik is currently producing 60 up to 3.3 m long magnet systems consisting of up to 12 multipole magnets integrated into each of the yokes for the bending achromats of the MAX IV 3 GeV storage ring and 12 similar systems for the MAX IV 1.5 GeV storage ring. Each magnet yoke contains combined function soft-end dipole and quadrupole elements which are machined out of one single iron block at tolerances of ± 0.02 mm. In addition, separate, higher order multipole magnets are kinematically mounted into the yokes. The integration of many magnetic elements into single yoke structures enables a compact, low emittance storage ring design. The dipole and quadrupole magnetic elements are magnetically field mapped with high precision on a 3D hall probe measuring bench. Higher order multipoles are measured on a slow rotating coil system developed for that purpose. Much effort has been put into automation in order to quickly perform the very comprehensive measurement program each girder will through.  
slides icon Slides MOODB102 [2.701 MB]  
 
MOPEA008 A Low-Emittance Lattice for the ESRF lattice, emittance, dipole, injection 79
 
  • L. Farvacque, N. Carmignani, J. Chavanne, A. Franchi, G. Le Bec, S.M. Liuzzo, B. Nash, T.P. Perron, P. Raimondi
    ESRF, Grenoble, France
  
  In the framework of its upgrade, the ESRF is looking at a new lattice for replacing the present Double Bend Achromat structure. This new lattice must have the same length and periodicity as the present one and keep the beamline source points unchanged. We will describe our design of an 844 m long lattice based on a 7-bend achromat. It is optimized for minimising the operation costs, in particular the wall-plug power, provides a large dynamic aperture allowing off-axis injection with the present ESRF injector, and gives an horizontal emittance of less than 200 pm at 6 GeV, thus considerably improving the brilliance and transverse coherence of the ESRF.  
 
MOPEA023 Lattice Design for the ILSF Booster Synchrotron booster, emittance, damping, quadrupole 121
 
  • E. Ahmadi, H. Ghasem, F. Saeidi
    ILSF, Tehran, Iran
  • H. Ghasem
    IPM, Tehran, Iran
  
  ILSF booster synchrotron is a full energy 3GeV injector with the circumference of 192m will be housed in a separate tunnel from storage ring. In order to keep low the emittance, a theoretical minimum emittance lattice in which the dipoles and quadrupoles have sextupole component has been considered for the booster. In this paper, the lattice concept and main features of the booster will be reported. The variation of emittance and beam size during booster ramping is also investigated. Finally the effect of existed eddy current on the chromaticity and dynamic aperture will be presented.  
 
MOPEA025 Closed Orbit Correction in the High Field Lattice of ILSF Storage Ring storage-ring, closed-orbit, lattice, dipole 127
 
  • H. Ghasem
    IPM, Tehran, Iran
  • E. Ahmadi, F. Saeidi
    ILSF, Tehran, Iran
  
  In the high intensity storage rings, there are many sources of errors which lead to closed orbit distortion (COD). To study effect of errors on closed orbit and to find optimum arrangement of beam position monitors (BPMs) and strength of corrector magnets, different types of expected misalignments and field errors were imposed randomly in the high field lattice of ILSF storage ring. This paper gives the results of closed orbit correction in the ILSF ring and stipulates the strength of correctors.  
 
MOPEA027 New Optics with Emittance Reduction at the SPring-8 Storage Ring optics, emittance, photon, injection 133
 
  • Y. Shimosaki, K. Fukami, K.K. Kaneki, K. Kobayashi, M. Masaki, C. Mitsuda, T. Nakamura, T. Nakanishi, H. Ohkuma, M. Oishi, M. Shoji, K. Soutome, S. Takano, M. Takao
    JASRI/SPring-8, Hyogo-ken, Japan
  
  The machine tuning of a new optics is in progress at the SPring-8 storage ring, in order not only to provide brilliant photons for current users but also to study a strategy of a lattice design and a tuning scenario for the upgrade project SPring-8 II. The natural emittance is reduced to 2.4 nmrad from the present value of 3.4 nmrad without any change of magnet positions. The flux density 1.3 times higher than the present was observed at the diagnostics beamline. The nominal injection efficiency of the order of 80 % has been achieved (the present: 92 %) by correcting the error of the optics function, by adjusting the strength of the injection magnets and by optimizing the sextupole magnetic fields. The beam lifetime was 13 h at 1 mA / bunch (the present: 22 h), and the momentum aperture estimated from the measurement of the Touschek lifetime was 2.3 % (the present: 2.8 %). Though these are tolerable to the user operation, further optimization of the sextupoles is ongoing. After verifying the photon beam performance at beamlines, this new optics will be applied to the user operation. The optics design and its beam performance will be presented in detail.  
 
MOPEA029 Status of UVSOR III injection, undulator, vacuum, quadrupole 139
 
  • T. Konomi, M. Adachi, K. Hayashi, M. Katoh, J. Yamazaki
    UVSOR, Okazaki, Japan
  • M. Adachi, M. Katoh
    Sokendai - Okazaki, Okazaki, Aichi, Japan
  
  UVSOR-III is the 750 MeV synchrotron light source. In 2012, three new components were installed in the storage ring. First one is combined function bending magnets to reduce the emittance from 27 nm-rad to 17 nm-rad. These magnets can produce dipole, quadrupole and sextupole fields at the same time. Second ones are an in-vacuum undulator and a beam line. It was installed at 1.5 m straight section, which is the last section reserved for insertion devices. As a result, UVSOR-III is now equipped with six undulators. It would provide soft X-rays to a scanning transmission X-ray microscope (STXM) beam-line. Last one is a newly designed pulse sextupole magnet at the injection point. This is beneficial to the user experiments in the top-up operation mode. Fine machine tuning is in progress.  
 
MOPEA030 Status of UVSOR-III injection, undulator, vacuum, cavity 142
 
  • N. Yamamoto
    Nagoya University, Nagoya, Japan
  • T. Konomi
    UVSOR, Okazaki, Japan
  
  Construction of the Central Japan Synchrotron Radiation (SR) Facility has been completed in the Aichi area of Japan, and the beam commissioning was started in Spring of 2012. Up to now, it is confirmed that the 1.2 GeV storage ring works with 300 mA Top-up mode. The key equipments of the accelerators are a compact electron storage ring with the ability to supply hard X-rays and full energy injectors for the top-up operation. The accelerators consist of an electron storage ring, a booster synchrotron ring, and an injector linac. In this prezentation, the present status of the accelerators are reported.  
 
MOPEA042 Research on the Design and Simulation of the CSRE Stochastic Cooling System pick-up, emittance, target, simulation 169
 
  • X.J. Hu, H. Jia, Y.J. Yuan, X.H. Zhang
    IMP, Lanzhou, People's Republic of China
  
  Stochastic cooling by the use of a feedback system, aims at cooling of secondary particles or particles with large emittance or momentum spread. My research is mainly on the simulation of horizontal and longitudinal stochastic cooling process. The purpose of my work is to obtain the optimum parameters for stochastic cooling, according the actual accelerator lattice. Pickup and preamplifier are already installed on the CSRe, and preliminary results are get.  
 
MOPEA047 Ramping of the Solaris Storage Ring Achromat quadrupole, optics, dipole, lattice 184
 
  • A.I. Wawrzyniak, C.J. Bocchetta, D. Einfeld, R. Nietubyć
    Solaris, Kraków, Poland
  • D. Einfeld
    MAX-lab, Lund, Sweden
  • R. Nietubyć
    NCBJ, Świerk/Otwock, Poland
  
  Funding: Work supported by the European Regional Development Fund within the frame of the Innovative Economy Operational Program:POIG.02.01.00-12-213/09,
The combined function magnets implemented for the MAX IV and Solaris 1.5 GeV storage ring double bend achromats (DBAs) represents a challenging task in magnetic design. The constituent magnets in the DBA block may be sensitive to saturation effects which must be accounted for, especially in the case of energy ramping, as is the case for Solaris and not for MAXIV, where injection will take place at a beam energy of 0.55-0.6 GeV. The magnetic field distribution was calculated as a function of energy in the range from 0.5 GeV up to 1.5 GeV for the gradient dipole and for the quadrupoles containing a sextupole component. Results show that for the dipole, which generates the strongest field, the relative change of quadrupole strength is lower than 4.10-3. For the quadrupoles the sextupole component is within the relative range of less than 0.7.10-4. The impact on linear and non-linear optics at low energies has been accordingly studied. This is on-going studies and only preliminary results are presented in this paper. 		 
 
MOPEA060 Design of Low Momentum Compaction Lattices for the TPS Storage Ring lattice, emittance, injection, dipole 217
 
  • C.-C. Kuo, H.-J. Tsai
    NSRRC, Hsinchu, Taiwan
  
  The nominal bunch length is around 10 ps rms in the Taiwan Photon Source (TPS), which is currently under construction. To further reduce bunch length to a few ps rms range, low momentum compaction factor configurations (low alpha), i.e., quasi-isochronous machines, are designed. The beam dynamics issues of the TPS low alpha lattices are reported.  
 
MOPEA075 Completion of the Brightness Upgrade of the ALS lattice, brightness, emittance, insertion 261
 
  • C. Steier, B.J. Bailey, K. Berg, A. Biocca, A.T. Black, P.W. Casey, D. Colomb, R.F. Gunion, N. Li, A. Madur, S. Marks, H. Nishimura, G.C. Pappas, K.V. Petermann, G.J. Portmann, S. Prestemon, A.W. Rawlins, D. Robin, S.L. Rossi, T. Scarvie, D. Schlueter, C. Sun, H. Tarawneh, W. Wan, E.C. Williams
    LBNL, Berkeley, California, USA
  • C. Chen, J. Jin, Y.M. Wen, J. Wu, L. Yin, J.D. Zhang, Q.G. Zhou
    SINAP, Shanghai, People's Republic of China
  
  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.
The Advanced Light Source (ALS) at Berkeley Lab remains one of the brightest sources for soft x-rays worldwide. A multiyear upgrade of the ALS is underway, which includes new and replacement x-ray beamlines, a replacement of many of the original insertion devices and many upgrades to the accelerator. The accelerator upgrade that affects the ALS performance most directly is the ALS brightness upgrade, which reduced the horizontal emittance from 6.3 to 2.0 nm (2.5 nm effective). Magnets for this upgrade were installed starting in 2012 followed by a transition to user operations with 2.0 nm emittance in spring 2013. 		 
 
MOPME076 Determination of Octupole and Sextupole Polarities in the LHC octupole, coupling, injection, lattice 655
 
  • M.J. McAteer, Y.I. Levinsen, E.H. Maclean, T. Persson, P.K. Skowroński, R.J. Steinhagen, R. Tomás
    CERN, Geneva, Switzerland
  
  We report the results of measurements to verify the polarity of the LHC’s lattice focusing and defocusing octupoles (MOF and MOD), spool piece octupole correctors (MCO), arc skew sextupole correctors (MSS), and interaction region sextupoles (MCSX and MCSSX). Octupole polarities were determined by measuring the change to second order chromaticity when a magnet family was trimmed. The MSS skew sextupole corrector polarities were checked by measuring the change to chromatic coupling when a magnet family was trimmed. The polarities of the MCSSX skew sextupoles in IR 1 and the MCSX normal sextupoles in IR 5 were checked by measuring the tune shift due to a magnet trim. Comparison of measurements with model predictions indicates that the polarities of the octupoles and the IR sextupoles are correct, and the polarities of the MSS skew sextupole correctors are reversed.  
 
MOPWA006 Magnet Power Supply with Small Ripple using Sub-converter and Symmetrical Structure power-supply, controls, feedback, extraction 675
 
  • S. Nakamura
    J-PARC, KEK & JAEA, Ibaraki-ken, Japan
  • S. Yamada
    KEK, Tokai, Ibaraki, Japan
  
  High precision tracking and small current ripple are necessary for a magnet power supply of a high power accelerator. A prototype power supply of the 100kW class is developed with an aim of small current ripple less than 10ppm, which employs a combination of main and sub-converter with symmetrical structure. The main converter unit supplies pattern current by a voltage feedforward control, while the sub-converters by a current feedback control. The symmetrical structure of the power supply is adopted to decouple normal mode and common mode ripples. Each converter unit is modularized and surrounded by a Faraday cage suppress for suppressing radiation of electrical noise and ease for maintenance. Its performance is studied using a set of 24 units of setupole magnets installed in J-PARC Main Ring.  
 
MOPWA046 The Multi-channel Measuring Data Acquisition Interface for TPS Quadrupole and Sextupole Magnet Power Supplies by using LabVIEW as the Developing Tool power-supply, quadrupole, controls, LabView 774
 
  • B.S. Wang, Y.-C. Chien, C.-Y. Liu, K.-B. Liu
    NSRRC, Hsinchu, Taiwan
  • H.P. Tsai
    Chroma ATE Inc., Taiwan
  
  This paper presents an implementation of a multi-channel measuring data acquisition interface of quadrupole and sextupole magnet power supplies (MPS) for Taiwan Photon source (TPS) withLabVIEW as the developing tool. The multi-channel measuring data acquisition interface could reduce quantity of measurement instrument and loading of operator at the MPS acceptance test. The instrument devices of measurement system include a multiplexer 、 a dynamic signal analyzer (DSA) and a multi-channel digital voltage meter (DVM), GPIB is the communication protocol betweenthe multi-channel measuring data acquisition interfaceand instruments. There are threeanalyzing procedure for the output currentof MPSin the default setting of the LabVIEW program, 1) Fast Fourier Transform of output current measured by DSA, 2) long-term stability of output current measured by DVM, 3) the linear error function fitting of output current by LabVEW toolbox;after these three analyzing procedureis completed, the performance of each MPS can be automatically generatedas a Microsoft Word report file.  
 
MOPWA048 The Cable Engineering Project for the TPS Power Supply booster, power-supply, storage-ring, dipole 780
 
  • C.-Y. Liu, D.-G. Huang, K.-B. Liu, B.S. Wang
    NSRRC, Hsinchu, Taiwan
  
  The civil engineering of Taiwan Photon Source will soon be completed. The engineering of the power supply cabling should be done in advance of the schedule for the completion of the civil engineering. Using software (SolidWorks) to build a 3-D model, we obtain detailed cabling information because the model is made to scale 1 to 1. As all components are built into the model of the TPS accelerator, we can build accurately a model of the power supply cabling. For example, we can estimate every length and the total cable length for purchase and budget control. We can evaluate the conditions for every power cable to lay the cable tray from the power supply to the magnets, so we can lay every cable to follow the sequence in the cable tray. We thereby convert the drawing of the two-dimensional construction graph when we design the finished three-dimensional cabling model. The excellent and precise results are proved in this paper.  
 
TUPFI014 HLLHCV1.0: HL-LHC Layout and Optics Models for 150 mm Nb3Sn Triplets and Local Crab-cavities optics, quadrupole, injection, ion 1358
 
  • R. De Maria, S.D. Fartoukh
    CERN, Geneva, Switzerland
  • A.V. Bogomyagkov
    BINP SB RAS, Novosibirsk, Russia
  • M. Korostelev
    The University of Liverpool, Liverpool, United Kingdom
  
  Funding: The HiLumi LHC Design Study is included in the HL-LHC project and is partly funded by the European Commission within the Framework Programme 7 Capacities Specific Programme, Grant Agreement 284404.
The paper presents the latest layout and optics models for the HL-LHC upgrade project. As an evolution from the previous version SLHCV3.1b, it integrates the new Nb3Sn triplet (140T/m, 150mm) with all the additional magnets needed to be compatible with a β* reach of 15cm and beyond. The collision optics implements the ATS* scheme which is able to provide very low value of β* and at the same time warrants outstanding control of the chromatic aberrations within the strength limits of the existing arc sextupole scheme of the LHC. The optics models include the injection and collision optics for proton and ion operations foreseen for the HL-LHC, with improved squeeze-ability of the existing IR2 and IR8 insertions, and all the corresponding optic transitions. An aperture model and a series of optics matched in thin lenses complete the needs for a large range of dedicated beam dynamic studies (dynamic aperture, beam-beam effects, collimation).
* S. Fartoukh, ‘’An Achromatic Telescopic Squeezing (ATS) Scheme for LHC Upgrade’’, in proceedings of IPAC11, p. 2088. 		 
 
TUPFI039 Optics Performance of the LHC During the 2012 Run coupling, optics, quadrupole, octupole 1433
 
  • P. Skowroński, T. Bach, M. Giovannozzi, A. Langner, Y.I. Levinsen, E.H. Maclean, T. Persson, S. Redaelli, T. Risselada, M. Solfaroli Camillocci, R. Tomás, G. Vanbavinckhove
    CERN, Geneva, Switzerland
  • M.J. McAteer
    The University of Texas at Austin, Austin, USA
  • R. Miyamoto
    ESS, Lund, Sweden
  • T. Persson
    Chalmers University of Technology, Chalmers Tekniska Högskola, Gothenburg, Sweden
  
  During 2012 the LHC was operating at 4TeV with beta star at ATLAS and CMS interaction points of 0.6m. During dedicated machine studies the nominal LHC optics was also setup with beta star of 0.4m. A huge effort was put into the optics commissioning leading to a record low peak beta-beating of around 7%. We describe the correction procedures and discuss the measurement results.  
 
TUPFI044 LHC Optics with Crab-waist Collisions and Local Chromatic Correction optics, luminosity, quadrupole, dipole 1448
 
  • J.L. Abelleira, S. Russenschuck, F. Zimmermann
    CERN, Geneva, Switzerland
  • C. Milardi, M. Zobov
    INFN/LNF, Frascati (Roma), Italy
  
  Funding: Work supported by the European Commission under the FP7 Research Infrastructures project Eu- CARD, grant agreement no. 227579.
We report the status of the optics design for a local chromatic correction with extremely-flat beams at the LHC. Together with a Large Piwinski angle, this optics opens up the possibility of crab-waist collisions at the LHC, for which a new layout of the LHC insertion region (IR) is needed. We present a complete optics and discuss the parameters of the final "double-half" quadrupole. 		 
 
TUPME012 Space Charge Simulation based on a Measured Optics in J-PARC MR optics, space-charge, resonance, coupling 1589
 
  • K. Ohmi, S. Igarashi, Y. Sato, J. Takano
    KEK, Ibaraki, Japan
  • S. Hatakeyama
    JAEA/J-PARC, Tokai-mura, Japan
  
  Linear optics parameters, beta, alpha, phase, x-y coupling and dispersion are measured by phase space monitor and/or other tools. Nonlinear effects due to the space charge and magnets are dominantly determined by linear optics. For example, the beam distribution is mainly determined by linear optics, and error of beta function at a sextuple magnet is larger than error of magnet strength generally. This means space charge simulation based on the measured optics takes into account of the major part of errors. We discuss how beam loss degrade and which resonances are induced by the errors in the simulations.  
 
TUPME024 Re-optimization of the Final Focus System Optics with Vertical Chromatic Correction luminosity, linear-collider, collider, optics 1622
 
  • Y. Wang, J. Gao
    IHEP, Beijing, People's Republic of China
  • P. Bambade
    LAL, Orsay, France
  
  Funding: The France China Particle Physics Laboratory (FCPPL) and The National Natural Science Foundation of China (NSFC, Project 11175192)
The purpose of the final focus (FF) system of the future linear collider (ILC and CLIC) is to demagnify the beam to the required size at the IP. This can be done in a compact way based on a local chromaticity correction. Two important issues are beam-beam induced radiation effects and the optical correction strategy to mitigate static and dynamic imperfections. For a small enough beam energy spread, we investigate the possibility to get a smaller vertical beam size, at the expense of a larger horizontal beam size, by re-optimising the final focus optics with chromatic correction mainly in the vertical plane. Firstly, we track the beam with MAD-X, with and without chromaticity correction, to estimate the optimum betax and betay values by rematching the linear optics, and cross-check and improve the rematching procedure with MAPCLASS. Then, we study the original design and an alternative simplified optical system, using a set of enlarged betax values, and optimize the sextupoles as a function of betay to minimize the vertical beam size for different assumptions on the energy spread. 		 
 
TUPME051 CLIC Final Focus System Alignment and Magnet Tolerances luminosity, quadrupole, feedback, linear-collider 1682
 
  • J. Snuverink, J. Barranco, H. Garcia, Y.I. Levinsen, D. Schulte, R. Tomás
    CERN, Geneva, Switzerland
  
  The design requirements for the magnets in the Compact Linear Collider (CLIC) Final Focus System (FFS) are very stringent. In this paper the sensitivity for the misalignment and the magnetic imperfections for the different magnets in the FFS and the crab cavity are presented. Possible mitigation methods are discussed.  
 
TUPWA003 Beam Based Magnet Alignment for Emittance Coupling Minimization quadrupole, emittance, storage-ring, coupling 1724
 
  • R.T. Dowd, G. LeBlanc, Y.E. Tan
    ASCo, Clayton, Victoria, Australia
  • K.P. Wootton
    The University of Melbourne, Melbourne, Australia
  
  Magnet misalignments give rise to field terms which can cause coupling between the horizontal and vertical beam motion and therefore emittance coupling. A series of beam based measurements have been developed at the Australian Synchrotron to accurately quantify quadrupole and sextupole alignments errors which cause coupling and where possible, correct them. Results showing an reduction in emittance coupling due to realignments of magnets based on these measurements will be presented. Limitations and general applicability of this method will also be discussed.  
 
TUPWO001 A New 5BA Low Emittance Lattice for Sirius emittance, lattice, dipole, coupling 1874
 
  • L. Liu, N. Milas, A.H.C. Mukai, X.R. Resende, A.R.D. Rodrigues, F. H. de Sá
    LNLS, Campinas, Brazil
  
  Sirius is a third-generation low emittance synchrotron light source under construction at LNLS, the Brazilian Synchrotron Light Laboratory. A new 5BA lattice was designed in replacement for the previous TBA lattice with the aim to reduce the emittance to sub-nm.rad values. The new design has a circumference of 518 m with 20 achromatic straight sections and a natural emittance of 0.28 nm.rad at 3 GeV for the bare lattice (without IDs). The dipoles combine low 0.58 T field magnets for the main beam deflection with a 2 T short superbend magnet sandwiched in the center dipole. This creates a longitudinal dipole gradient that is used both to lower the emittance and to provide hard X-ray dipole sources.  
 
TUPWO006 Orbit Correction System at the Collector Ring closed-orbit, quadrupole, optics, dipole 1886
 
  • A. Dolinskyy, O. Chorniy, O.E. Gorda, A.G. Kalimov, H. Leibrock, S.A. Litvinov, M. Steck
    GSI, Darmstadt, Germany
  
  The CR is dedicated ring for cooling of hot beam coming either from the antiproton separator or SFRS. It is anticipated that the understanding and control of the beam orbits will be important for achieving low beam losses. We describe our plans for measuring and correcting the COD of the CR. The closed orbit of the CR, which is distorted due to magnets misalignments, can reduce the ring acceptance by factor of 2, if a special correction system is not applied. The system, which is developed for the CR should be periodically or manually invoked to correct the global closed orbit and used to adjust the orbit position at some point using local bump. BPM and corrector magnets, which are planned to be used at the CR, are described in this paper. SVD method is used to obtain the corrector strength or corrector factors in global or local orbit correction.  
 
TUPWO017 Simulation on the Breaking of αx Multiknob Orthogonality in the Presence of Gradient and Coupling Errors and Experimental Investigation coupling, simulation, quadrupole, linear-collider 1919
 
  • S. Bai, J. Gao
    IHEP, Beijing, People's Republic of China
  • P. Bambade
    LAL, Orsay, France
  • G.R. White
    SLAC, Menlo Park, California, USA
  
  The ATF2 project is the final focus system prototype for ILC and CLIC linear collider projects, with a purpose to reach a 37nm vertical beam size at the interaction point. In beam tuning towards the goal beam size, the presence of a tilt of the IP Shintake monitor fringe pattern with respect to the x-y coordinate system of the beam can break the orthogonality in the main σ34 and σ32 waist corrections required to reduce the vertical beam size at IP. Concerning the method of doing αx scan and measuring the vertical beam size to diagnose the IPBSM fringe tilt or residual σ13, one thing should be studied is to check what could break the orthogonality of the αx knob other than σ13 and the IPBSM fringe tilt. In this paper, we report on the simulation study that check for the breaking of orthogonality of the αx knob in the presence of gradient and coupling errors; to what extent this breaking of orthogonality can go; and also calculate the IPBSM fringe tilt angle from experiment results.  
 
TUPWO069 Optimization of FACET Optics optics, lattice, chromatic-effects, simulation 2024
 
  • M.-H. Wang, F.-J. Decker, N. Lipkowitz, Y. Nosochkov, G.R. White, U. Wienands, M. Woodley, G. Yocky
    SLAC, Menlo Park, California, USA
  
  Funding: supported by the US Department of Energy contract DE-AC02-76SF00515.
The FACET accelerator facility is designed to provide short and intense e- or e+ bunches with small spot size for plasma wakefield accelerator research and other experiments. It is based on the SLAC linac with a compressor chicane in sector-10, and a second compressor chicane and final focus in sector-20 (S20). Originally, the S20 chicane was designed to be compatible with an upgrade to include a second S20 chicane for simultaneous transport of e- and e+ bunches. This placed additional optics constraints which lead to strong focusing in the S20 chicane. The latter increases the effects of errors causing emittance growth. Lately, it has been decided not to proceed with the upgrade option. Therefore, there is a potential for improving the optics by relaxing the constraints. In this study, we explore alternative optics designs where beta functions in the S20 chicane and final focus are reduced in order to minimize the error effects. The optics and non-linear aberrations are evaluated, and the chromatic correction is optimized for each design. Beam tracking simulations are performed using Elegant and Lucretia. The most optimal designs are identified based on these simulations. 		 
 
WEPWA018 Pulsed Sextupole Injection for BAPS injection, emittance, septum, storage-ring 2168
 
  • Y. Jiao, G. Xu
    IHEP, Beijing, People's Republic of China
  
  In this paper we present the physical design of the pulsed sextupole injection system for Beijing Advanced Photon Source (BAPS) with an ultralow emittance. The BAPS ring lattice is designed in such a way that two injection options are allowed, i.e., with septum and pulsed sextupole in different drift spaces or in the same drift space. For both options optimal conditions are obtained for high injection efficiency. It is found that the available efficiency in a storage ring with limited acceptance can be affected by position-dependent dispersive effect induced by the pulsed sextupoles.  
 
WEPWA049 Top-up Safety Simulations for the ALBA Storage Ring dipole, quadrupole, simulation, storage-ring 2229
 
  • G. Benedetti
    CELLS-ALBA Synchrotron, Cerdanyola del Vallès, Spain
  
  The potential hazards introduced by injecting into the ALBA storage ring with front end shutters open are determined through particle tracking simulations. The method is based on the possible overlap between phase space of forwards and backwards tracking between the straight section downstream the front end and the beamline. Realistic magnetic field, trajectory, aperture and energy errors are taken into account. Scenarios that could bring an injected beam of electrons passing through an open beamline front end are identified. The interlocks required to prevent such situations from arising are stated.  
 
WEPWA063 Longitudinal Beam Transport in the ALICE IR-FEL Facility FEL, quadrupole, dipole, linac 2262
 
  • F. Jackson, D. Angal-Kalinin, J.K. Jones, P.H. Williams
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  • A. Wolski
    The University of Liverpool, Liverpool, United Kingdom
  
  The ALICE facility at Daresbury Laboratory is an energy recovery test accelerator which includes an infra-red oscillator-type free electron laser (IR-FEL). The longitudinal transport functions (including R56 and T566) in the ALICE accelerator lattice are studied in this paper by use of precision time-of-arrival methods. The results allow characterisation of the triple bend achromat (TBA) arcs and compression chicane of the lattice. The relevance of the results to the operational performance of ALICE as a IR-FEL facility and a THz source is discussed.  
 
WEPEA003 Dipole Fringe Field Effects in the ThomX Ring dipole, quadrupole, closed-orbit, betatron 2504
 
  • J.F. Zhang
    LAL, Orsay, France
  • A. Loulergue
    SOLEIL, Gif-sur-Yvette, France
  
  Thom-X is a 50 MeV compact ring based on the Compton back-scattering which is being built in LAL, France. With a very short bend radius of 0.352 m, the nonlinear effects of the dipole fringe fields become critical to the beam dynamic . This paper compares the modelings of the dipole fringe field using four popular codes: MadX, Elegant, BETA, and Tracy3, and then discuss the proper model to have consistent results between the analytical calculation and the symplectic tracking of the Thom-X ring.  
 
WEPEA008 Influence of Higher Order Phase Slip Factor Contributions on Beam Loss during SIS-100 Proton Operation quadrupole, lattice, simulation, dynamic-aperture 2507
 
  • S. Sorge, O. Boine-Frankenheim, G. Franchetti
    GSI, Darmstadt, Germany
  
  The projected FAIR synchrotron SIS-100 is envisaged to accelerate intense proton and heavy-ion beams. The maximum proton energy will be E=29 GeV. In order to stay below transition energy a special powering scheme of the quadrupoles has been introduced which provides a maximum transition gamma of 45.5. The resulting settings of the quadrupole focusing strengths generate large maxima of the horizontal beta and dispersion functions. In particle tracking simulation we observed beam loss caused by a large momentum spread in the deformed rf bucket close to transition. Application of the chromaticity correction sextupoles led to a reduction of the first-order phase slip factor term and of the beam losses. In this contribution we will analyze the effect of the sextupoles on the higher-order components of the phase slip factor. The rf bucket shape will be discussed as well as the transverse beam loss and possible longitudinal instabilities.  
 
WEPEA009 Effects of Field Imperfections in the Isochronous Mode of the CR Storage Ring at FAIR dipole, quadrupole, octupole, simulation 2510
 
  • S.A. Litvinov, A. Dolinskyy, O.E. Gorda, M. Steck, H. Weick
    GSI, Darmstadt, Germany
  • D. Toprek
    VINCA, Belgrade, Serbia
  
  Today the challenge is to measure masses of exotic nuclei up to the limits of nuclear existence which are characterized by low production cross-sections and short half-lives. The large acceptance Collector Ring (CR) at FAIR tuned in the isochronous ion-optical mode offers unique possibilities for such measurements. Nonlinear field errors as well as fringe fields of the wide aperture quadrupoles and dipoles strongly excite the high-order aberrations which negatively affect the time resolution of the isochronous ring. Their influence is investigated here and a possible correction scheme is shown.  
 
WEPEA015 Possibility Study of High Repetition Rate Operation of JPARC Main Ring injection, multipole, quadrupole, space-charge 2528
 
  • K. Fan, S. Igarashi, K. Ishii, T. Koseki, M. Uota
    KEK, Ibaraki, Japan
  
  The original design of JPARC main ring is to provide high beam power of 750 kW with machine repetition rate of 0.3 Hz. However, the severe space charge effects at low injection energy limit the beam intensity. In order to raise the beam power to the design limit, one logical way is to increase the repetition rate. However, the resulting eddy current in the laminations and pipes may impair the field quality of all magnets. In addition, the activation of beam pipe becomes severer in high beam power operation. Titanium beam pipe is proposed to replace the stainless steel pipe to reduce the activation and decrease the decay time. However, titanium has lower resistivity, severer eddy current effects are expected. The studies investigate the eddy current effects on field quality of the main dipole, quadrupole and sextupole magnets.  
 
WEPEA022 Analytical Estimations of the Dynamic Apertures of Beams with Momentum Deviation and Application in FFAG dynamic-aperture, positron, simulation, lattice 2546
 
  • M. Xiao, J. Gao
    IHEP, Beijing, People's Republic of China
  
  Analytical formulae for estimating the dynamic apertures of synchrotron particles has been well established. Based on the standard mapping, we extend the analytical formulae of dynamic aperture for off-momentum particles in circular accelerator. And we compare the analytical results with the simulation ones in the BEPC-II positron ring lattice under some conditions. What's more, we give the analytical formulae of dynamic aperture for FFAG in the similar way.  
 
WEPEA024 Combine Effects of Space Charge and Chromaticity Sextupoles at CSNS/RCS emittance, simulation, space-charge, acceleration 2552
 
  • S.Y. Xu, S. Wang
    IHEP, Beijing, People's Republic of China
  
  Most high current proton synchrotrons, such as The Rapid Cycling Synchrotron (RCS) of The China Spallation Neutron Source (CSNS), are operated under the transition energy, and the natural chromaticity is small. These proton synchrotrons can work without chromatic correction. To reduce the tune spread produced by the chromaticity, chromatic correction is considered by using chromaticity sextupoles for this type of proton synchrotrons, such as J-PARC and SNS. Many chromatic correction schemes are compared for the CSNS/RCS, and the harmonic sextupoles are considered to correct nonlinear effect of chromaticity sextupoles. The dynamic aperture is obtained by particle tracking, and the combine effects of sextupole field and space charge effects are investigated by using the code ORBIT and SIMPSONS.  
 
WEPEA025 Chromatic Sextupole Pair Optimization Methods for Enlarging Dynamic Aperture lattice, dynamic-aperture, focusing, storage-ring 2555
 
  • Z. Bai, Q.K. Jia, W. Li, L. Wang, Q. Zhang
    USTC/NSRL, Hefei, Anhui, People's Republic of China
  
  Based on the step-by-step chromaticity compensation method [1] and artificial intelligence algorithms, we propose new numerical methods, called chromatic sextupole pair optimization methods, for enlarging the dynamic aperture of electron storage rings. In the new methods, the decision variables related to chromatic sextupole pairs are optimized using artificial intelligence algorithms to enlarge the dynamic aperture. We demonstrate that the new methods are equivalent to the recently used numerical method, in which the decision variables, sextupole strengths, are optimized using artificial intelligence algorithms.
[1] E. Levichev, P. Piminov, Proceedings of EPAC 2006, p. 2116. 		 
 
WEPEA027 Nonlinear Model Calibration in Electron Storage Rings via Frequency Analysis radiation, betatron, storage-ring, damping 2558
 
  • G. Liu, W. Li, L. Wang, K. Xuan
    USTC/NSRL, Hefei, Anhui, People's Republic of China
  
  Frequency analysis of turn-by-turn BPM data is a very useful numerical method for analysing the detrimental effect of the nonlinear resonances in storage rings, and which has been widely used for nonlinear resonances measurement and correction. We applied this method in this paper for calibrating the nonlinear model by numerical fitting of the sextupole components with the effect of radiation damping and decoherence of the betatron oscillation in HLSII storage ring.  
 
WEPEA036 Spin Tune Decoherence Effects in Electro- and Magnetostatic Structures betatron, acceleration, emittance, synchrotron 2579
 
  • Y. Senichev, R. Maier, D. Zyuzin
    FZJ, Jülich, Germany
  • N.V. Kulabukhova
    St. Petersburg State University, St. Petersburg, Russia
  
  In Electric Dipole Moment search experiments with polarized beams the coherence of spin oscillations of particles has a crucial role. The decoherent effects arise due to spin tune dependence on particle energy and particle trajectory in focusing-deflecting fields. They are described through the n-th order spin tune aberrations. Since the first order is suppressed by RF field, the second order plays crucial role. It depends on the orbit lengthening and on the odd order field components. We consider the spin decoherence effects and methods of their compensation in different channels, electrostatic, magnetostatic linking the decoherence effects with common characteristics such as the momentum compaction factor, the chromaticity and others.  
 
WEPEA058 LSS Layout Optimizations for Low-beta Optics for the HL-LHC quadrupole, optics, luminosity, chromatic-effects 2639
 
  • B.J. Holzer, R. De Maria
    CERN, Geneva, Switzerland
  • R. Appleby, L.N.S. Thompson
    UMAN, Manchester, United Kingdom
  • L.N.S. Thompson
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  
  Funding: The HiLumi LHC Design Study is included in the HL-LHC project and is partly funded by the European Commission within the Framework Programme 7 Capacities Specific Programme, Grant Agreement 284404
The High Luminosity LHC (HL-LHC) project aims to upgrade the existing LHC to a peak luminosity of the order 1035cm-2s−1, while retaining as much of the nominal layout and hardware as possible. The current baseline for this upgrade is the use of the Achromatic Telescopic Squeeze (ATS) concept, which allows mini-Beta squeeze in IRs 1 and 5 (ATLAS and CMS respectively) far below that possible with nominal optics. However it is useful to both explore the parameter space of the ATS scheme while also attempting to push the boundaries of the nominal layout. This paper presents a study into maximising optical flexibility of the nominal LHC Long Straight Sections (LSSs) around IPs 1 and 5. This involves replacing, moving or adding magnets within the LSS to investigate feasibility of exploiting a more conventional optical scheme than the ATS scheme. In particular the option of replacing single LSS quadrupoles with doublets is explored. The study also looks at making similar changes to the LSS while also implementing the ATS scheme, to further explore the ATS parameter space with the benefit of experience gained into flexibility of a modified nominal LHC optical scheme. 		 
 
WEPEA081 Local 3Qy Betatron Resonance Correction in the 2012 RHIC 250 GeV Run resonance, dynamic-aperture, proton, betatron 2696
 
  • Y. Luo, W. Fischer, T. Roser, V. Schoefer, C.M. Zimmer
    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.
In this article we performed numerical simulations to correct the local vertical third order betatron resonance 3Qy in the interaction regions in the Yellow ring for the 2012 RHIC 250~GeV polarized proton run. Considering the main sources of skew sextupoles are located in the interaction regions, we used local bump methods to minimize their contributions to the global 3Qy resonance driving term. Two kinds of correction orbit bumps are tested and the dynamic apertures with these correction strengths are calculated and compared. 		 
 
THPEA050 Power Supply Control and Applications Development for the TPS Storage Ring Quadrupole and Sextupole Magnet controls, quadrupole, power-supply, EPICS 3258
 
  • Y.-S. Cheng, J. Chen, P.C. Chiu, K.T. Hsu, C.Y. Liao, C.Y. Wu
    NSRRC, Hsinchu, Taiwan
  
  The TPS intermediate power supply for storage ring quadrupole and sextupole magnets with current rating 250 Amp will be equipped with Ethernet interface. The quadrupole power supply is 18bit with higher stability than sextupole with 16 bits, and have internal data buffer for post-mortem capability. The dedicated IOCs are built individually at the 24 cPCI platforms to manipulate the devices of the 24 cells of storage ring respectively. Each IOC is used to control 10 quadrupole magnet power supplies and 7 sextupole magnet power supplies. The GUIs of storage ring quadrupole and sextupole power supplies controls were implemented by the EDM toolkit. The client console can use the specific EDM pages to access power supplies via PVs channel access. The measured currents of quadrupole and sextupole power supplies were read back for observing performance. Some applications, like the degauss process, boot function and etc, are also developed with the specific toolkit. The efforts will be summarized at this report.  
 
THPME003 Standard Sextupole Magnets for NSLS-II Synchrotron dipole, synchrotron, booster, target 3517
 
  • C.W.O. Ostenfeld, N. Hauge, P. Ladefoged
    Danfysik A/S, Taastrup, Denmark
  
  Danfysik received the order to design, manufacture and test 169 Standard Sextupole Magnets for the NSLS-2 synchrotron. Extraordinary tight tolerances were specified for the mechanical and magnetic properties. We present a re-optimized magnetic pole profile to make a more mechanically robust design, suitable for large-scale manufacture. Due to a well-controlled wire erosion process during the manufacturing stage, the mechanical tolerances were kept on the 10 micron level, even after assembly/disassembly cycles. A major challenge of the project was to verify the magnetic performance of the magnets. This was done using our in-house harmonic measurement bench. We present magnetic measurements of the magnet series, measured over more than 24 months, which show high stability, both in terms of magnetic roll angle, error field terms, and integrated strength.  
 
THPME005 Status of the Super FRS Magnet Development for FAIR dipole, quadrupole, status, octupole 3519
 
  • H. Müller, E.S. Fischer, H. Leibrock, P. Schnizer, M. Winkler
    GSI, Darmstadt, Germany
  
  The Super-FRS is a new two stage in flight separator to be built on the site of GSI, Darmstadt, Germany as part of the FAIR (Facility for Anti-proton and Ion Research). It will be able to create and spatially separate rare isotopes from all elements up to Uranium. Also very short lived nuclei will be observed efficiently. The Super-FRS has three branches, so a wide variety of experiments can be carried out in frame of the NUSTAR collaboration. The large acceptance needed leads to large apertures of the magnets and therefore only a superconducting solution is feasible. The magnets of the Super-FRS are of the so called superferric type. These magnets use superconducting coils but the field is shaped by magnetic iron yoke. In this contribution the actual status of the designs of the dipole and multipole magnets will be presented.  
 
THPME023 A NEW HARMONIC COIL BENCH AT SINAP FOR THE ALS COMBINED FUNCTION SEXTUPOLE MAGNETS multipole, dipole, controls, quadrupole 3552
 
  • J.D. Zhang, H.W. Du, L. Yin, Q.G. Zhou
    SINAP, Shanghai, People's Republic of China
  • N. Li, A. Madur
    LBNL, Berkeley, California, USA
  
  A new harmonic coil bench has been developed at Shanghai Institute of Applied Physics (SINAP) to measure the ALS combined function sextupole magnets. The measurement system has been designed with the aim to perform precise, fast and reliable measurements of series of magnets. It determines the strength, and the multipole content of the field as well as the magnetic axis for precise positioning of alignment targets on top of the multipoles. The multipole, while supported on a marble platform, can be moved with regard to the rotating coil using multi-dimensional adjustment plate. The resolution of the movement is read out by micrometer with a few μm resolutions. This article introduces the measurement system constitutes.  
 
THPME024 Magnet Designs of the In-flight Fragment Separator for the RISP quadrupole, dipole, radiation, target 3555
 
  • D.G. Kim, J.Y. Kim, J.-W. Kim, M. Kim, M. Kim, C.C. Yun, A. Zaghloul
    IBS, Daejeon, Republic of Korea
  
  Magnets to be used for the in-flight fragment separator of the rare isotope science project (RISP) have been designed. The dipole magnets have a gap width of 150 mm and a magnetic rigidity of 10 Tm. The superferric quadrupole magnets have a pole tip radius of 170 mm and a maximum field gradient of 14 T/m. In addition, superconducting multiple coils will be wound around the cold bore tube of the quadrupole magnet to make high-order magnetic field corrections. In the high radiation region near the production target, warm iron dipole and quadrupole magnets employing high temperature superconductor (HTS) coils will be used in order to reduce the cold mass and to remove large radiation heat loads effectively at the temperature of 30-50 K. The design of dipole and quadrupole magnets has been optimized considering technical constraints and the manufacturing of the prototype of superferric quadrupole magnets is in progress. Simulation results using OPERA-3D and some results of prototyping will be presented.  
 
THPME029 Design of NSLS-II Booster Dipoles with Combined-function Magnetic Field dipole, booster, extraction, injection 3570
 
  • S.V. Sinyatkin, A.N. Dubrovin, S.M. Gurov, E.B. Levichev, Yu.A. Pupkov, E.R. Rouvinsky, A.V. Sukhanov
    BINP SB RAS, Novosibirsk, Russia
  
  Focusing and defocusing dipoles magnets of NSLS-II 3 GeV booster are designed, manufactured and measured in BINP, Russia. The magnets should provide the booster operation at energy from 170 MeV to 3.15 GeV with a 2 Hz frequency. Because of booster compactness the dipoles have quadrupole and sextupole components and should create high quality of field of ± 2·10-4 in region of ± 2 cm. In this paper the design and results of 2D and 3D simulation are presented.  
 
THPME030 Magnetic Measurement Results of the NSLS-II Booster Dipole Magnets dipole, booster, alignment, extraction 3573
 
  • S.V. Sinyatkin, G.N. Baranov, A.M. Batrakov, P.N. Burdin, D.B. Burenkov, S.M. Gurov, V.A. Kiselev, V.V. Kobets, E.B. Levichev, I.N. Okunev, A. Polyansky, Yu.A. Pupkov, L.E. Serdakov, P. Vobly
    BINP SB RAS, Novosibirsk, Russia
  
  Focusing and defocusing dipole magnets for NSLS-II 3 GeV booster are designed, manufactured and measured in BINP, Russia. Magnetic measurements of 32 BD and 28 BF magnets are made by BINP. In this paper the results of magnetic measurements of dipoles magnets in the field area of 0.638 – 11.829 kGs for BD type and 0.260 - 4.829 kGs for BF type are given. Analysis and comparison with magnetic field simulation are made.  
 
THPME031 Ramped Magnetic Measurement of NSLS-II Booster Dipoles vacuum, dipole, booster, quadrupole 3576
 
  • I.N. Okunev, G.N. Baranov, A.M. Batrakov, A.I. Erokhin, V.A. Kiselev, V.V. Kobets, A.V. Pavlenko, S.V. Sinyatkin, R.V. Vakhrushev
    BINP SB RAS, Novosibirsk, Russia
  
  13. The magnetic system of NSLS II Booster are designed, manufactured and tested in BINP, Russia. The dipoles of the Booster have quadrupole and sextupole components and should create high quality of field ± 2·10-4 in region ± 2 cm. Magnets should provide performance of booster for energy from 170 MeV to 3.15 GeV with 2 Hz frequency. This report considers ramped magnetic measurement of NSLS-II Booster Dipoles.  
 
THPME032 Magnetic Measurement of the NSLS-II Booster Dipole with Combine Functions booster, dipole, extraction, quadrupole 3579
 
  • I.N. Okunev, G.N. Baranov, A.M. Batrakov, P.N. Burdin, D.B. Burenkov, V.V. Kobets, A. Polyansky, L.E. Serdakov, S.V. Sinyatkin
    BINP SB RAS, Novosibirsk, Russia
  
  The magnetic system of NSLS II Booster are designed, manufactured and tested in BINP, Russia. The dipoles of the Booster have quadrupole and sextupole components and should create high quality of field ± 2·10-4 in region ± 2 cm. Magnets should provide performance of booster for energy from 170 MeV to 3.15 GeV with 2 Hz frequency. To measure multipole field components one need to know accurate position of the probes in 3D coordinates. This report considers description of the magnetic measurement stand and achived accuracy for DC case.  
 
THPME037 Magnetic Field Character of TPS Booster Magnets quadrupole, multipole, dipole, booster 3594
 
  • J.C. Jan, C.-H. Chang, H.-H. Chen, Y.L. Chu, M.-H. Huang, C.-S. Hwang, C.Y. Kuo, F.-Y. Lin, C.S. Yang, Y.T. Yu
    NSRRC, Hsinchu, Taiwan
  
  The Taiwan Photon Source (TPS) is a 3-GeV synchrotron radiation facility operated in top-up injection mode. The booster ring of TPS shares the same tunnel, concentric with the storage ring. The lattice of the booster is a 24-cell DBA of circumference 496.8 m. The energy of the electron beam is ramped from 150 MeV to 3 GeV at repetition rate 3 Hz in the booster ring. The trajectory of the electron beam is controlled with complicated combined-function magnets including combined dipole magnet, combined quadrupole magnet, pure quadrupole magnet, sextupole magnet and corrector magnet. The measurement and performance of these magnets are discussed in this letter.  
 
THPME044 Fabrication and Test of a 1 M Long Single-aperture 11 T Nb3Sn Dipole for LHC Upgrades dipole, luminosity, interaction-region, magnet-design 3609
 
  • A.V. Zlobin, N. Andreev, G. Apollinari, E.Z. Barzi, R. Bossert, G. Chlachidze, J. DiMarco, A. Nobrega, I. Novitski, D. Turrioni, G. Velev
    Fermilab, Batavia, USA
  • B. Auchmann, M. Karppinen, L. Rossi, D. Smekens
    CERN, Geneva, Switzerland
  
  Funding: Work is supported by Fermi Research Alliance, LLC, under contract No. DE-AC02-07CH11359 with the U.S. Department of Energy and European Commission under FP7 project HiLumi LHC, GA no.284404
The planned upgrade of the LHC collimation system includes two additional collimators to be installed in the dispersion suppressor areas around points 2, 3 and 7, and high luminosity interaction regions in points 1 and 5. The necessary longitudinal space for the collimators could be provided by replacing some 8.33 T NbTi LHC main dipoles with 11 T dipoles based on Nb3Sn superconductor and compatible with the LHC lattice and main systems. To demonstrate this possibility Fermilab and CERN have started in 2011 a joint R&D program with the goal of building by 2015 a 5.5-m long twin-aperture dipole prototype suitable for installation in the LHC. An important part of the program is the development and test a series of short single-aperture demonstration dipoles with the nominal field of 11 T at the LHC nominal current of ~11.85 kA and ~20% margin. This paper describes the design features and test results of a 1-m long single-aperture Nb3Sn demonstrator dipole for the LHC collimation system upgrade. 		 
 
THPME046 A Summary of the Quality of the ALS Combined Function Sextupole Magnets dipole, multipole, quadrupole, controls 3615
 
  • N. Li, A. Madur
    LBNL, Berkeley, California, USA
  • C. Chen, H.J. Hu, J. Jin, Y.M. Wen, L. Yin, J.D. Zhang, Q.G. Zhou
    SINAP, Shanghai, People's Republic of China
  
  Funding: This work was supported by the Office of Science, U.S. Department of Energy under DOE contract number DE-AC02-05CH11231.
A total of 51 combined function magnets is required to upgrade the Advanced Light Source (ALS) Storage Ring at LBNL. These magnets will provide 4 types of magnetic fields: sextupole, horizontal and vertical dipoles, and skew quadrupole and will enable an emittance reduction and upgrade of the beam quality in the ALS ring. A relatively new procedure using EDM cut poles after core assembly that was first used by Buckley System Ltd, NZ was adopted during the production of these magnets. Also, a new 3D CAD modeling was used for the coil design. A total of 57 magnets (including prototypes and spare magnets) were built by the Shanghai Institute of Applied Physics (SINAP) in China. These magnets have achieved extraordinarily high pole profile accuracies and exhibit excellent coil performance characteristics: resistances and water flows reached a high degree of consistency. Consequently, the system errors of the magnetic field of these magnets all meet the LBNL specifications. This paper will summarize the mechanical quality and magnetic field properties of these magnets. The interrelationship between the qualities of coil and the magnet field will be described as well. 		 
 
THPME052 Analysis of the NSLS-II Magnet Measurement Data dipole, quadrupole, storage-ring, multipole 3624
 
  • W. Guo, A.K. Jain, S.K. Sharma, J. Skaritka, C.J. Spataro
    BNL, Upton, Long Island, New York, USA
  
  Funding: Work supported by U.S. DOE, Contract No. DE-AC02-98CH10886
NSLS-II is a third generation 3GeV light source that is under-construction at the Brookhaven National Laboratory. The 30-DBA-cell storage ring will provide micron size beam resulting from the 1nm emittance. Recently the last magnet was received and the completion of girder installation in the tunnel is foreseeable in a few months. In this paper we will briefly review the physics considerations for the magnet specifications, the major field quality related issues that arose during the fabrication process. Our emphasis will be on the statistical analysis of the magnet measurement results and comparison with the design tolerances. 		 
 
THPWO065 Optics Design and Correction of High Order Aberration of the Charge Stripper Beam Line of RAON stripper, ion, emittance, optics 3906
 
  • H.J. Kim, D. Jeon, H.J. Kim
    IBS, Daejeon, Republic of Korea
  • J.G. Hwang, E.-S. Kim
    Kyungpook National University, Daegu, Republic of Korea
  
  RAON (Rare isotope Accelerator Of Newness) in Korea will be providing the 400 kW of 238U79+ beam with 8 puA and 200 MeV/u. One of the critical components of this project in the SCL is the design of the charge stripper. Between the two segments of the SCL, the charge stripper strips electrons from ion beams to enhance the acceleration efficiency in the following SCL2. For high efficiency of the acceleration and high power in SCL2, the optimum energy of striped ion in solid carbon foil stripper for SCL1 was estimated by using code LISE. The thickness of the solid carbon foil is 300 ug/m2. Based on this study, the charge stripping efficiency of solid carbon stripper is ~80 %. For the charge selection from ions which produced by the solid carbon stripper, the dispersive section is required in down-stream of the foil. The designed optics for dispersive section is based on the mirror-symmetric optics to minimize the effect of high-order aberration. And the high-order aberration in designed optics was investigated and performed the correction of high-order effect using sextupole magnets.