IPAC2013 - List of Keywords (storage-ring)

Paper	Title	Other Keywords	Page
MOPEA001	Status of the Australian Synchrotron Top-Up Operations	injection, synchrotron, linac, diagnostics	58
	M.J. Boland, R.T. Dowd, G. LeBlanc, D.C. McGilvery, D. Morris, Y.E. Tan, J. Trewhella, D. Zhu, E.D. van Garderen ASCo, Clayton, Victoria, Australia
	In May 2012 the Australian Synchrotron commenced Top-Up Operations for User beamtime. The facility was designed for top-up from the start with a full energy 3 GeV injection system, however top-up only became a priority once the beamline user community had established itself at the new facility in operation since April 2007. New beam diagnostic and equipment protections systems were implemented as part of the move to top-up, including a new injection efficiency monitoring system. The effect of top-up on the beamline data was also tested with each beamline prior to engaging top-up during user runs. Top-up has now been running successfully for one year and the performance statistics from this period will be presented. Top-up operations is a very popular standard mode for user beam and falling into decay mode is now treated almost as a beam dump.

MOPEA002	1.5 GeV Low Energy Mode for the Australian Synchrotron	booster, extraction, synchrotron, injection	61
	R. Clarken, M.J. Boland, Y.E. Tan ASCo, Clayton, Victoria, Australia J.S. Hughes, K.P. Wootton The University of Melbourne, Melbourne, Australia
	The Australian Synchrotron injection system and storage ring have been retuned to 1.5 GeV for use in special operations and machine development modes. The systems were designed for 3 GeV user operations but for certain research a lower energy of 1.5 GeV is advantageous. A description of how the new low energy mode was achieved is given, including extraction on the fly from the booster synchrotron and scaling of the storage ring lattice.

MOPEA009	ESRF Operation and Upgrade Status	undulator, emittance, booster, permanent-magnet	82
	J.-L. Revol, J.C. Biasci, J-F. B. Bouteille, F. Ewald, L. Farvacque, A. Franchi, G. Gautier, L. Goirand, M. Hahn, L. Hardy, J. Jacob, J.M. Koch, M.L. Langlois, G. Lebec, J.M. Mercier, T.P. Perron, E. Plouviez, P. Raimondi, K.B. Scheidt, V. Serrière ESRF, Grenoble, France
	The European Synchrotron Radiation Facility (ESRF) is presently midway through the Upgrade Programme Phase I (2009-2015), which concerns its infrastructure, beamlines and X-ray source. This paper reports on the present operation performance of the source, highlighting the more recent developments. In this context, 8 insertion device straight sections have been lengthened from five to six metres; two of them operating with canted undulators. The lattice of one cell has been modified for a further increase to 7 metres allowing the test of a mini beta optics and latter the distribution of cavities. A second cryogenic permanent magnet undulator has been completed, which gives a factor of more than 2 in flux at high energy. The booster klystron-based radio frequency transmitter has been replaced by high power solid state amplifiers. Out of three prototypes of HOM damped cavities working at room temperature which have been received and tested, one has been successfully commissioned with beam. Subsequent to the upgrade of the beam position monitor system, a new orbit feedback has substantially reduced the orbit distortion induced by ID gap motions.

MOPEA014	Temporal and Spectral Observation of Laser-induced THz Radiation at DELTA	electron, laser, radiation, simulation	94
	P. Ungelenk, H. Huck, M. Huck, M. Höner, S. Khan, R. Molo, A. Schick DELTA, Dortmund, Germany N. Hiller, V. Judin KIT, Karlsruhe, Germany
	Funding: Work supported by the DFG, the BMBF, the Federal State NRW, the Initiative and Networking Fund of the Helmholtz Association, and the German Federal Ministry of Education and Research. Coherent THz pulses caused by a laser-induced density modulation of the electron bunches are routinely produced and observed at DELTA, a 1.5 GeV synchrotron light source operated by the TU Dortmund University. New measurements performed with a fast hot-electron bolometer allow insight into the turn-by-turn evolution of these pulses. Furthermore, first results from a Fourier transform infrared spectrometer, which is currently under commissioning, are presented.

MOPEA015	A Transverse Electron Target for Heavy Ion Storage Rings	electron, target, ion, interaction-region	97
	S. Geyer, O. Meusel, D. Ries IAP, Frankfurt am Main, Germany O.K. Kester GSI, Darmstadt, Germany
	A transverse electron target is a well suited concept under discussion for storage rings to investigate electron-ion interaction processes relevant for heavy ion accelerators. Using a sheet beam of free electrons in crossed beam geometry promises not only a high energy resolution but also allows access to the interaction region for photon and electron spectroscopy under large solid angles. To realize a compact and multi-purpose applicable design, only electrostatic fields are used for beam focussing. The produced electron beam has a length of 10cm in ion beam direction and a width of around 5mm in the interaction region with densities of ~10⁹electrons/cm³. The target geometry allows the independent adjustment of the electron beam current and energy in the region of several 10eV and a few keV. The setup meets the high requirements for an operation in the UHV environment of a storage ring and is installed applying the so-called animated beam technique. The electron target is dedicated to the FAIR storage rings. First measurements have been performed at a test bench. An overview of the project status will be presented including first results of the characterization measurements.

MOPEA019	Studies of Bunch-bunch Interactions in the ANKA Storage Ring with Coherent Synchrotron Radiation using an Ultra-fast Terahertz Detection System	radiation, synchrotron, wakefield, synchrotron-radiation	109
	A.-S. Müller, B.M. Balzer, C.M. Caselle, N. Hiller, M. Hofherr, K.S. Ilin, V. Judin, B. Kehrer, S. Marsching, S. Naknaimueang, M.J. Nasse, J. Raasch, A. Scheuring, M. Schuh, M. Schwarz, M. Siegel, N.J. Smale, J.L. Steinmann, P. Thoma, M. Weber, S. Wuensch KIT, Karlsruhe, Germany
	Funding: Supported by Initiative and Networking Fund of the Helmholtz Association under contract No. VH-NG-320 and German Federal Ministry of Education and Research under Grant. Noss. 05K10VKC and 05K2010VKD In the low-alpha operation mode of the ANKA synchrotron light source, coherent synchrotron radiation (CSR) is emitted from short electron bunches. Depending on the bunch current, the radiation shows bursts of high intensity. These bursts of high intensity THz radiation display a time evolution which can be observed only on long time scales with respect to the revolution period. In addition, long range wake fields can introduce a correlation between the bunches within a bunch train and thus modify the observed behavior. A novel detection system consisting of an ultra-fast superconducting THz detector and data acquisition system was used to investigate correlations visible on the bursting pattern and to study the interactions of very short pulses in the ANKA storage ring.

MOPEA020	Comparison of Different Approaches to Determine the Bursting Threshold at ANKA	radiation, synchrotron, electron, synchrotron-radiation	112
	P. Schönfeldt, N. Hiller, V. Judin, A.-S. Müller, M. Schwarz, J.L. Steinmann KIT, Karlsruhe, Germany
	The synchrotron light source ANKA at the Karlsruhe Institute of Technology provides a dedicated low-α-optics. In this mode bursting of Coherent Synchrotron Radiation (CSR) is observed for bunch charges above a threshold that depends on beam parameters. This threshold can be determined by several approaches, e.g. bunch lengthening or changes in the THz radiation spectra. This paper compares different methods and their implementation at the ANKA storage ring outlining their advantages, disadvantages and limitations, including reliability and possibility of real time analysis.

MOPEA025	Closed Orbit Correction in the High Field Lattice of ILSF Storage Ring	closed-orbit, lattice, dipole, sextupole	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.

MOPEA043	Transverse Instabilities of Two Twisted Beams in a Storage Ring	ion, electron, simulation, kicker	172
	B.C. Jiang, M.Z. Zhang, Z.T. Zhao SINAP, Shanghai, People's Republic of China G.X. Xia UMAN, Manchester, United Kingdom
	Two twisted beams (two beams run on the different closed orbit) in a storage ring which is produced by fast kickers can potentially deliver two bunds of radiations through one insertion device or one bend magnet, in this way doubles the beam line stations. This operation mode needs higher beam current and more RF buckets to be filled to keep the brightness comparable to the single beam operation mode. The resistive wall instability and ion trapping effects is analysed to address the higher current operation possibility. The analyze results show that twisted beams can weaken those two instabilities.

MOPEA045	Performance Optimization and Upgrade of the SSRF Storage Ring	emittance, optics, injection, cavity	178
	Z.T. Zhao, B.C. Jiang, Y.B. Leng, S.Q. Tian, L. Yin, W.Z. Zhang SINAP, Shanghai, People's Republic of China
	The SSRF storage ring achieved its design performance goal in 2008, in the following years its performance was optimized and improved, including implementing top-up operation and low emittance lattice configuration as well as other attempts like fast orbit feedback and low alpha mode. In order to meet the requirements of accommodating more beamlines and high demanding performance in its phase-II beamline project, the SSRF storage ring is being upgraded with a design based on superbend based lattice and a third harmonic RF cavity system. This paper presents the main optimization works and the upgrade design considerations on the SSRF storage ring performance.

MOPEA046	Solaris Project Progress	linac, vacuum, injection, klystron	181
	A.I. Wawrzyniak, C.J. Bocchetta, P.B. Borowiec, D. Einfeld, P.P. Goryl, M. Młynarczyk, R. Nietubyć, M.P. Nowak, W. Soroka, M.J. Stankiewicz, P. Szostak, P.S. Tracz, Ł. Walczak, K. Wawrzyniak, J.J. Wiechecki, M. Zając, L. Żytniak 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 Solaris is a 3rd generation light source facility being built in Kraków, Poland at the Jagiellonian University Campus. The project is being accomplished in a tight collaboration with the MAX IV Laboratory in Lund, Sweden. The Solaris 1.5 GeV storage ring is a replica of the MAX IV 1.5 GeV machine, whereas the injector and the transfer line although based on the same components, are unique for Solaris. One of the main differences is the 600 MeV injection energy requiring an energy ramp in the storage ring to the final operating energy of 1.5 GeV. The construction of the facility started in early 2010 and is planned to be finished in the autumn 2014. Up to now, 70% of the components have been procured and construction of the buildings in progress with expected handover in autumn 2013. This paper will give an update on infrastructure progress and design choices for shielding, service area placement of racks and routing of piping and cables. An update is also presented of machine layout that includes the injector, transfer line and storage ring.

MOPEA049	The First Experience of PLS-II Operation	injection, linac, lattice, insertion	190
	S.H. Nam, M.-H. Cho, J.Y. Huang, C.D. Park, S. Shin PAL, Pohang, Kyungbuk, Republic of Korea
	Funding: Mministry of Education, Science and Technology (MEST) of Korea One of recent major activities of the Pohang Accelerator Laboratory (PAL) in Korea has been PLS-II user operation. The PLS-II is a Korea’s only and brand new 3rd generation synchrotron radiation source that was upgraded from the 16-year-old PLS in 2011. The old PLS started user service from 1995 and shutdown on Dec. 10, 2010. The PLS-II has been open to users from March 2012 with upgraded performance. The performance parameters of the PLS-II are 5.8 nm-rad emittance, 3.0GeV beam energy, and 400mA beam current with the top-up injection. The unique feature of PLS-II will be the implementation of 20 insertion-devices in a compact double-bend-achromat storage ring of 280m-long circumference. Among 20 insertion-devices, 14 are in-vacuum undulators. The first year operation in 2012 will be successfully completed and the operational statistics will be summarized and discussed.

MOPEA055	First Year Operation of the ALBA Synchrotron Light Source	vacuum, interlocks, kicker, feedback	202
	F. Pérez CELLS-ALBA Synchrotron, Cerdanyola del Vallès, Spain
	ALBA is a 3 GeV, 3rd generation, light source located in Cerdanyola, Barcelona, Spain, which started users operation in May 2012. In this paper we will report about the transition from commissioning to operation, the main problems faced during this first year, the actual status of the accelerators and we will provide an outlook to the next steps.

MOPEA056	Measuring and Improving the Momentum Acceptance and Horizontal Acceptance at MAX III	cavity, lattice, electron, vacuum	205
	A. Hansson, Å. Andersson, J. Breunlin, G. Skripka, E.J. Wallén MAX-lab, Lund, Sweden
	Lifetime measurements for varying horizontal scraper positions performed at different RF frequencies suggested a horizontal aperture restriction in the MAX III synchrotron light source. A combination of local orbit distortions and horizontal scraper measurements pinpointed the location of the horizontal aperture restriction to the center of the main cavity straight section. The aperture restriction was determined to be located 10.4 ± 0.3 mm from the beam center. The precise result was achieved by measurements and calculations of the Touschek lifetime as a function of the main cavity voltage. Realignment of the main cavity increased the average lattice momentum acceptance from 0.0116 ± 0.0003 to 0.0158 ± 0.0003 and the horizontal acceptance from 26 ± 2 × 10^-6 m to larger than 44 ± 2 × 10^-6 m. The increase in momentum acceptance increased the lifetime in MAX III by a factor of two.

MOPEA062	Metrology of the NESTOR Facility Equipment	target, dipole, quadrupole, survey	222
	O. Bezditko, V.E. Ivashchenko, I.M. Karnaukhov, A. Mytsykov, A.V. Reuzayev, A.Y. Zelinsky NSC/KIPT, Kharkov, Ukraine
	Development of X-ray generator NESTOR in the National Science Center Kharkov Institute of Physics&Technology will let significantly extend the scientific program of investigations that are carried out in NSC KIPT, will allow to increase an amount and improve quality of experimental researches in the field of physics and chemistry In this work tolerances for accuracy installation of the lattice elements of the complex are defined. The methods of lattice element position measurement were detected and ways of their realization were defined. These allow to realize the project parameters of NESTOR facility and, first of all, generated X-ray beam intensity.

MOPEA063	The First Results of the NESTOR Commissioning	injection, dipole, electron, focusing	225
	A.Y. Zelinsky, V.P. Androsov, O. Bezditko, V.N. Boriskin, P. Gladkikh, A.N. Gordienko, V.A. Grevtsev, A. Gvozd, V.E. Ivashchenko, A.A. Kalamayko, I.I. Karnaukhov, I.M. Karnaukhov, D. Korzhov, V.P. Kozin, V.A. Kushnir, V.P. Lyashchenko, M.P. Maksim, V.S. Margin, N.I. Mocheshnikov, V.V. Mytrochenko, A. Mytsykov, F.A. Peev, O.V. Ryezayev, V.P. Sergienko, A.A. Shcherbakov, S. Sheyko, V.L. Skirda, Y.N. Telegin, V.I. Trotsenko, O.P. Zolochevskij, O.D. Zvonarjova NSC/KIPT, Kharkov, Ukraine
	In the paper the first results of the NESTOR facility are presented. 60 MeV electron linac injector has been tested and the first electron beam with project parameters was registered at the screen monitors. Electron beam was passed through the transportation channel and injection system. As a result, the first turn of the storage ring was closed.

MOPEA069	Tuning of the Injector System to Match Possible Lattice Upgrades at Diamond Light Source	linac, booster, lattice, injection	243
	C. Christou, R. Bartolini, J. Kay Diamond, Oxfordshire, United Kingdom R. Bartolini JAI, Oxford, United Kingdom
	Studies of novel lattice upgrades for Diamond Light Source to achieve an increase in the number of insertion devices and/or a lower natural emittance are underway (as reported elsewhere at this conference). Such upgrades if carried out progressively would result in successive reductions in storage ring circumference. To maintain synchronous injection then requires the injector system to operate at various frequencies to match these changes. This paper describes the tests carried out with beam, to prove that the injector system of Linac and full energy Booster can be tuned over an extended frequency range.

MOPEA071	Operating the Diamond Storage Ring with Reduced Vertical Emittance	feedback, emittance, coupling, target	249
	I.P.S. Martin, M.G. Abbott, M. Apollonio, R. Bartolini, D. Hickin Diamond, Oxfordshire, United Kingdom R. Bartolini JAI, Oxford, United Kingdom
	In a synchrotron radiation light source, a reduction in vertical emittance can potentially increase the source brightness, reduce the spot size for microfocus beam lines or increase the vertical transverse coherence of the photon beam. With this aim, the target vertical emittance for the Diamond storage ring has been recently reduced from 27pm.rad to 8pm.rad (0.3% coupling). In this paper we discuss the main impacts of this reduction, along with the steps that have been taken to stabilise the coupling at the new value.

MOPEA077	Accelerator Physics and Light Source Research Program at Duke University	FEL, wiggler, electron, feedback	264
	Y.K. Wu FEL/Duke University, Durham, North Carolina, USA
	Funding: This work is supported in part by the US DOE grant no. DE-FG02-97ER41033. he accelerator physics and light source research program at Duke Free-Electron Laser Laboratory (DFELL), TUNL, is focused on the development of the storage ring based free-electron lasers (FELs), and a state-of-the-art Compton gamma-ray source, the High Intensity Gamma-ray Source (HIGS). Driven by the storage ring FEL, the HIGS is world's most intense Compton gamma-ray source with a maximum total flux of few 10¹⁰ gamma per second (around 10 MeV). Operated in the energy range from 1 to 100 MeV, the HIGS is a premier nuclear physics research facility in the world. In 2012, we completed a major accelerator upgrade project with a wiggler switchyard system which allows the configuration changes between planar and helical FEL wigglers, and a great enhancement of the FEL gain when operated with 3 or 4 helical wigglers. In this paper, we will describe our ongoing light source development to produce gamma-ray beams in the new energy range of 100 and 158 MeV. We will also provide a summary of our accelerator physics research activities in the area of nonlinear dynamics, beam instability research, and FEL research.

MOPEA078	Commissioning and Operation of Wiggler Switchyard System for Duke FEL and HIGS	wiggler, FEL, vacuum, lattice	267
	Y.K. Wu, M.D. Busch, M. Emamian, J.F. Faircloth, H. Hao, J.Y. Li, S.F. Mikhailov, V. Popov, G. Swift, P.W. Wallace, P. Wang, J. Yan FEL/Duke University, Durham, North Carolina, USA A.L. Wu USTC/NSRL, Hefei, Anhui, People's Republic of China
	Funding: This work is supported in part by the US DOE grant no. DE-FG02-97ER41033. To enable the Duke storage ring FEL to operate in VUV with adequate gain, a major storage ring upgrade was carried out in 2012 to install two additional helical FEL wigglers with a wiggler switchyard system. Using the switchyard, a quick changeover can be made between two planar OK-4 wigglers and two helical OK-5 wigglers in the middle of the FEL straight section. This system preserves the linear polarization capabilities of the Duke FEL and gamma-ray beams at the High Intensity Gamma-ray Source (HIGS), while enabling VUV FEL operation with a higher gain using a longer FEL with as many as four helical wigglers. The wiggler switchyard upgrade was completed in Summer 2012, followed by a rapid and successful commissioning of the Duke storage ring, FEL system, and HIGS. In this paper, we will present the results of accelerator and light source commissioning with the wiggler switchyard. We will also present preliminary results of operating the OK-5 FEL in different configurations. With the wiggler switchyard, we are well positioned to realize the operation of a VUV FEL below 190 nm and production of Compton gamma-ray beams above 100 MeV in circular polarization.

MOPEA080	Status of the NSLS-II Injector	booster, linac, injection, kicker	273
	T.V. Shaftan, A. Blednykh, E.B. Blum, W.X. Cheng, J. Choi, L.R. Dalesio, M.A. Davidsaver, J.H. De Long, R.P. Fliller, G. Ganetis, F. Gao, A. Goel, W. Guo, K. Ha, R. Heese, H.-C. Hseuh, M.P. Johanson, B.N. Kosciuk, S. Kowalski, S.L. Kramer, Y. Li, W. Louie, S. Ozaki, D. Padrazo, J. Rose, S. Seletskiy, S.K. Sharma, G. Shen, O. Singh, V.V. Smaluk, Y. Tian, K. Vetter, W.H. Wahl, G.M. Wang, F.J. Willeke, X. Yang, L.-H. Yu, P. Zuhoski BNL, Upton, Long Island, New York, USA
	We discuss the current status and plans for developing the NSLS-II injector. The latter consists of a 200 MeV linac, a 3-GeV booster, transport lines and the storage ring injection straight section. The system design and installation are complete. Last year we concluded 200-MeV linac commissioning and are planning to commission the 3 GeV booster during summer of 2013.

MOPME014	Electro-optical Bunch Length Measurements at the ANKA Storage Ring	laser, electron, wakefield, background	500
	N. Hiller, A. Borysenko, E. Hertle, E. Huttel, V. Judin, B. Kehrer, S. Marsching, A.-S. Müller, M.J. Nasse, A. Plech, M. Schuh, S.N. Smale KIT, Karlsruhe, Germany P. Peier, V. Schlott PSI, Villigen PSI, Switzerland B. Steffen DESY, Hamburg, Germany
	Funding: Supported by the Initiative and Networking Fund of the Helmholtz Association under contract number VH-NG-320 and by the German Federal Ministry of Education and Research under contract number 05K10VKC A setup for near-field electro-optical bunch length measurements has recently been installed into the UHV system of the ANKA storage ring. For electro-optical bunch length measurements during ANKA's low alpha operation, a laser pulse is used to probe the field induced birefringence in an electro-optical crystal (GaP in our case). The setup allows for both electro-optical sampling (EOS, multi-shot) and spectral decoding (EOSD, single- and multi-shot) measurements. This paper presents first results and discusses challenges of this method employed for the first time at a storage ring.

MOPME015	Numerical Wakefield Calculations for Electro-optical Measurements	simulation, wakefield, laser, impedance	503
	B. Kehrer, A. Borysenko, E. Hertle, N. Hiller, V. Judin, S. Marsching, A.-S. Müller, M.J. Nasse, M. Schuh KIT, Karlsruhe, Germany
	Funding: This project is funded by the Federal Ministry of Education and Research under the contract number 05K10VKC The technique of electro-optical measurements allows precise and single-shot measurements of the bunch length and shape. The installation of such a near-field setup changes the impedance of the storage ring and the corresponding effects have to be studied carefully. One possibility is to use numerical codes for simulating the wakefields induced by the setup. Such simulations has been done using the wakefield solver implemented in the CST Studio Suite. In this paper we present the simulation results together with first measurements.

MOPME041	Design and Calculation of the Stripline Beam Position Monitor for HLS II Storage Ring	quadrupole, coupling, simulation, impedance	562
	F.F. Wu, C. Cheng, W.B. Li, P. Lu, T.J. Ma, B.G. Sun, H. Xu, Y.L. Yang, Z.R. Zhou USTC/NSRL, Hefei, Anhui, People's Republic of China
	Funding: Supported by the National Science Foundation of China (10875117, 11005105, 11175173) According to the requirements of HLS II upgraded, in order to acquire the non-intercepting measurement of beam position and quadrupole component, a new stripline beam position monitor (BPM) was designed for storage ring. The BPM parameters were optimized to acquire impedence matching with characteristic impedance of the external transmission lines and the coupling coefficients between the electrodes were calculated. According to the difference/sum and log-ratio methods, the horizontal and vertical sensitivities, mapping figures and fitting polynomials wered acquired. The results showed that sensitivities using log-ratio method were bigger than those using difference/sum method. The sum signal was also simulated when beam displacement varied from (0 mm, 0 mm) to (5 mm, 5 mm), the result showed that the variation of normalized sum signal was no more than ±6%. The gaussian weighted method of a two-dimensional grid structure was used to simulate the gaussian bunch and simulate the beam transverse quadrupole component changing with position (x, y), the result showed that the beam transverse quadrupole component changed linearly with position combination (x2-y2).

MOPME042	A PRELIMINARY SIMULATION OF BPM SIGNAL DIODE DETECTOR FOR HLS II TUNE MEASUREMENT SYSTEM*	simulation, betatron, pick-up, synchrotron	565
	J.J. Zheng, P. Lu, T.J. Ma, B.G. Sun, Y.L. Yang, J.Y. Zou USTC/NSRL, Hefei, Anhui, People's Republic of China
	Funding: Supported by National Natural Science Foundation of China (11105141, 11175173) and the Fundamental Research Funds for the Central Universities (WK2310000015) A high sensitivity BPM signal detection front-end electronics has been designed for HLS II tune measurement system according to the HLS II upgrade requirements. Classical tune measurement systems filter out just one or a few of these betatron sidebands frequency. As a consequence, most of the betatron energy is dropped and only a very small energy remains for further processing. A new method, referred to as Direct Diode Detection (3D) by LHC[1], improves the situation. In this paper, the HLS II BPM signals have been calculated out in time domain and frequency domain. Basing on the characteristics of HLS II BPM signal, a preliminary simulation is performed to test and verify the feasibility of diode detector for HLS II tune measurement system. The simulation results clearly show that the technique of diode-based circuit can be applied to HLS II tune measurement.

MOPME052	Beam Instrumentation System Optimization for Top-up Operation in SSRF	pick-up, injection, instrumentation, booster	589
	Y.B. Yan, Y.B. Leng, L.Y. Yu, W.M. Zhou SINAP, Shanghai, People's Republic of China
	In order to offer higher average brightness and more stable photon beam, top-up injection mode is scheduled for daily operation in SSRF. Several critical beam parameters, such as fill pattern, average current, beam lifetime and transfer efficiency, need to be measured precisely and reliably, and few interlock logics need to be added into machine protection system with top-up mode. Hardware and software optimizations of beam instrumentation for this purpose will be introduced in this paper.

MOPME053	Point Spread Function Study of X-ray Pinhole Camera in SSRF	radiation, synchrotron, synchrotron-radiation, emittance	592
	Z.C. Chen, J. Chen, G.Q. Huang, Y.B. Leng SSRF, Shanghai, People's Republic of China
	Funding: Supported by National Natural Science Foundation of China (11075198) An X-ray Pinhole Camera that has been used to present the transverse beam size with an intuitive grasp of the distribution of the beam radiation was installed on one beam-line of the storage ring in Shanghai Synchrotron Radiation Facility (SSRF). The real beam size however is a function of the image size of the CCD camera and the point spread function (PSF) of the system. The PSF was calculated but poorly tested. This article will present the measurement of the PSF with a series of beam based experiments and the consistency with the theoretical beam size.

MOPME054	Bunch-by-bunch Beam Position and Charge Monitor based on Broadband Scope in SSRF	injection, pick-up, synchrotron, synchrotron-radiation	595
	Y. Yang, Y.B. Leng, Y.B. Yan, N. Zhang SSRF, Shanghai, People's Republic of China
	A bunch-by-bunch beam position and charge monitor system, based on a broadband oscilloscope, has been developed at SSRF. The beam positions of each bunch could be located independently in this system by using the original signals from the button-type pickups on the storage ring. The relative charge of each bunch could be obtained by the sum signal from the pickups. Using sum weighted average method, turn-by-turn beam position could be got from the bunch-by-bunch beam position data. The difference of each bunch beam position have been observed during injection at SSRF.

MOPWA002	New Purposed High Precision Power Supply For Quadrupole Magnets Of ILSF using Low Resolution Digital PWM	power-supply, quadrupole, controls, feedback	664
	M. Jafarzadeh, M. Akbari, J. Rahighi, D. Shirangi, E.H. Yousefi ILSF, Tehran, Iran
	A total number of 10⁴ quadrupole magnets, split into 9 families, will be required for the ISLF storage ring lattice. Each quadrupole magnet is connected with its own independent power supply. In new design for quadrupole magnets, the outputs of two synchronized push-pull converters (one for coarse regulation and another for fine current regulation) will be added together before a synchronous rectification. In this manner, there will be no need for extra high-current electronic parts. Another advantage of this design is using a high-voltage inductor on the switching side rather than a high current inductor ion the high current side. The PWM signal to control of buck converter (at the input stage of each unit) will be generated inside a dsPIC .

MOPWA013	The New Injection System of the HLS II	septum, kicker, pulsed-power, controls	687
	L. Shang, Y. Lu, F. Shang, Y.Y. Wang USTC/NSRL, Hefei, Anhui, People's Republic of China
	Funding: The program is funded by NSFC with No. 10875116 and No. 11175181 The 0.8GeV storege ring is being rebuilt in NSRL. The design and construction of the new injection system of the new ring is presented. Kicker magnet, septum magnet and their pulsed power suplies are described. Test results are given. The ceramic chambers, vacuum tank of the septum magnet, system timing and local pulsed power control are also described. The installation and testing of the new system undergoing.

MOPWA045	The Pulsed Power Supply System for TPS Project	injection, kicker, power-supply, booster	771
	C.-S. Fann, C.L. Chen, K.T. Hsu, S.Y. Hsu, A.P. Lee, K.-K. Lin, K.L. Tsai NSRRC, Hsinchu, Taiwan
	The pulsed power supply system for TPS project consists of three types of pulser for booster injection/extraction and storage ring injection. Categorizing by the delivered peak current, pulse shape base-width, they are for: 1) booster kicker: 500 A, square, 1 μs; 2) storage ring kicker: 5 kA, half-sine, 5 μs; 3) transfer line septum: 10 kA, half-sine, 300 μs; respectively. All together, there are 10 units constructed for the associated pulsed magnets. In this report, the test results of the pulsed power supplies will be summarized and the measured results of their performance are presented.

MOPWA048	The Cable Engineering Project for the TPS Power Supply	booster, power-supply, dipole, sextupole	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.

MOPWO058	Injection Simulations for TPS Storage Ring	injection, simulation, kicker, lattice	1022
	C.C. Chiang, P.J. Chou NSRRC, Hsinchu, Taiwan
	We present injection simulations for the TPS (Taiwan Photon Source) storage ring. The baseline lattice of TPS storage ring is a 6-fold structure with 24 double bend cells. For the Step I commissioning, only baseline lattice with dummy chambers are installed. The three double mini-beta-y lattice with insertion devices will be applied during Step II commissioning. The Tracy-2 program is used to simulate the particle motion in 6-D phase space. We adopt lattice models which include errors of alignments and magnet fields. The particle loss due to scraping by chamber limit is recorded in Tracy-2 simulation. We can estimate the radiation distribution of a ring and provide a reference for the shielding design accordingly.

MOPWO061	Numerical Approaches for Simulation of Stochastic Cooling in 2D Phase Space	emittance, simulation, coupling, electromagnetic-fields	1028
	M. Dolinska NASU/INR, Kiev, Ukraine C. Dimopoulou, A. Dolinskyy, F. Nolden GSI, Darmstadt, Germany
	A consolidated fluid-dynamics algorithm for the analysis of beam dynamics under the influence of the electromagnetic field is presented. Aiming at simulating stochastic cooling of particle beams in 2D space, two numerical algorithms solving the 2D Fokker-Planck Equation are described. As an alternative approach, a numerical method based on the macro-particle tracking turn in turn in the ring (i.e. in the time domain) is introduced. Some results of the simulation of the stochastic cooling in the Collector Ring by both methods are discussed.

MOPWO067	Beam Dynamics Simulations with a GPU-accelerated Version of Elegant	simulation, acceleration, collective-effects, controls	1040
	I.V. Pogorelov, K.M. Amyx, J. Balasalle, J.R. King Tech-X, Boulder, Colorado, USA M. Borland, R. Soliday ANL, Argonne, USA
	Funding: Work supported by the US DOE Office of Science, Office of Basic Energy Sciences under grant number DE-SC0004585, and by Tech-X Corporation Large scale particle tracking and tracking-based lattice optimization simulations can derive significant benefit from efficient implementation of general-purpose particle tracking on GPUs. We present the latest results of our work on accelerating Argonne National Lab's accelerator simulation code ELEGANT,* using CUDA-enabled GPUs. A sufficiently large number of Elegant beamline elements has been ported to GPUs to allow the GPU-accelerated simulation of realistic test lattices. We will identify some of performance-limiting factors, and briefly discuss optimization techniques for efficient utilization of the device memory space, with an emphasis on register usage. We also present a novel hardware-assisted technique for efficiently calculating a histogram from a large distribution of particle coordinates, and compare this to data-parallel implementations. * M. Borland, Elegant: A Flexible SDDS-compliant Code for Accelerator Simulation, APS LS-287, September 2000 ** Y. Wang, M. Borland, in Proc. of PAC07, THPAN095 (2007)

TUXB101	Status of the FAIR Facility	ion, antiproton, target, heavy-ion	1085
	O.K. Kester GSI, Darmstadt, Germany
	The unique facility for Antiproton and Ion Research – FAIR will deliver stable and rare isotope beams covering a huge range of intensities and beam energies. In addition, the beams for the experiments will have highest beam quality for a cutting edge physics program. Therefore a unique accelerator facility using cutting edge technology will be built until 2018. The challenges are heavy ion synchrotrons for highest intensities, antiproton and rare isotope production stations, high resolution separators and several storage rings where beam cooling can be applied. Here new kind of superconducting magnets, rf-systems, injection and extraction systems and beam diagnostics will be applied. As the construction of the FAIR facility and procurement has started, an overview of the designs, procurements status and infrastructure preparation will be provided.
	Slides TUXB101 [9.587 MB]

TUODB102	Intrabeam Scattering Studies for Low Emittance of BAPS	emittance, wiggler, damping, lattice	1123
	S.K. Tian, Y. Jiao, J.Q. Wang, G. Xu IHEP, Beijing, People's Republic of China
	In modern storage ring light sources, intra-beam scattering (IBS) is often thought of as a fundamental limitation to achieving ultra-low emittance and hence higher brightness. Beijing Advanced Photon Source (BAPS) is under design at Institute of High Energy Physics (IHEP) which aims to emittance less than 1nm at 5GeV. To improve the coherence and high brightness, low emittance- in both transverse planes at the diffraction limit for the range of x-ray wavelengths(≈10 pm)- is being pursued. Thus, due to the very low emittance, intra-beam scattering effect is an issue. Accurate estimation to check if the design goal can be reached is necessary. In this paper, we use the 6-D accelerator simulation code-elegant and Accelerator Toolbox (AT)-a collection of tools to model storage rings in the MATLAB environment. Based on a temporary design lattice of BAPS, we present the results of particle simulation study of intra-beam scattering effect versus the beam energy, the emittance coupling factor, the bunch length, the bunch current and so on. We also studied the mitigating method by adopting damping wigglers in one or more dispersion-free regions.
	Slides TUODB102 [2.338 MB]

TUXB201	Short-pulse Operation of Storage Ring Light Sources	radiation, electron, photon, optics	1129
	A.-S. Müller KIT, Karlsruhe, Germany
	Short-pulse operation of synchrotron light source storage rings can be useful for both the production of IR and THz-band radiation and high repetition rate pump-probe science in the X-ray regime. Different approaches to short-pulse generation include low-alpha optics configurations, two-frequency RF potential manipulation, laser-induced femtoslicing, longitudinal crab-cavity deflection and pseudo-bunch operation with a fast kicker to isolate a single bunch. This talk should review each of these techniques and discuss implications for machine operation in terms of pulse length, beam intensity, beam stability, pulse repetition rate, output radiation beam quality and potential applications.
	Slides TUXB201 [12.058 MB]

TUOAB201	Ultra-Short X-ray Pulse Generation by Electron Beam Slicing in Storage Rings	electron, linac, emittance, photon	1134
	L.-H. Yu, F.J. Willeke BNL, Upton, Long Island, New York, USA
	Funding: Department of Energy, USA We propose a new method to generate ultra-short x-ray pulses using focused short low energy (5-10MeV) electron bunch to slice a short electron bunch from the electron bunches in a synchrotron radiation storage ring. When the low energy electron bunch crosses from top the high energy electron bunch at right angle, its coulomb force will kick a short slice of high energy electrons away from the core of the storage ring electron bunch. When the low energy electron bunch (about 50 pC) is focused to about 50 micron size and compressed to about 150fs bunch length and is positioned on top of the high energy electron bunch by a distance about 30 micron, the coulomb force is sufficient to give a kick vertically to the electrons within a short slice of the storage ring bunch about 200 fs long with a deflection about 4 micro-radian. This is sufficient to deflect the slice away from the core by a separation of 5 times the angular divergence of the beam. The separated slice when passing through an undulator, will radiate ulstra-short x-ray pulses at about 200 fs. We discuss the advantages and challenges of this new method. We provide data to demonstrate the feasibility of this method.
	Slides TUOAB201 [1.578 MB]

TUOAB202	ILSF, A Third Generation Light Source Laboratory in Iran	synchrotron, dipole, quadrupole, cavity	1137
	J. Rahighi, M.R. Khabazi IPM, Tehran, Iran E. Ahmadi, H. Ajam, M. Akbari, S. Amiri, A. Babaei, J. Dehghani, R. Eghbali, J. Etemad Moghadam, S. Fatehi, M. Fereidani, H. Ghasem, A. Gholampour, A. Iraji, M. Jafarzadeh, B. Kamkari, S. Kashani, P. Khodadoost, H. Khosroabadi, M. Moradi, H. Oveisi, S. Pirani, M. Rahimi, M. Razazian, A. Sadeghipanah, F. Saeidi, R. Safian, E. Salimi, Kh.S. Sarhadi, O. Seify, M.Sh. Shafiee, A. Shahveh, A. Shahverdi, D. Shirangi, E.H. Yousefi ILSF, Tehran, Iran D. Einfeld CELLS-ALBA Synchrotron, Cerdanyola del Vallès, Spain
	The Iranian Light Source Facility (ILSF) project is a first large scale accelerator facility which is currently under planning in Iran. The circumference of the storage ring is 297.6 m with the energy of 3 GeV. The facility will be built on a land of 100 hectares area in the city of Qazvin, located 150 km West of Tehran. The city is surrounded by many universities, research centers and industrial companies. The design and construction of prototype items such as radio frequency solid state amplifier, dipole magnets, highly stable magnet power supplies and girders have already begun. A low field H-type dipole magnet with the central field of 0.5T at the gap of 34mm and length of 500mm was built and tested in site. Also a prototype storage ring quadrupole with a 18 T/m gradient and 233 iron length is in now in fabrication process. Site selection studies, including geotechnical and seismological measurements are being performed. Conceptual Design Report, CDR, as the first milestone of the project has been published on October 2012.
	Slides TUOAB202 [5.173 MB]

TUOAB203	ESRF Upgrade Phase II	lattice, emittance, vacuum, brilliance	1140
	J.-L. Revol, P. Berkvens, J.C. Biasci, J-F. B. Bouteille, N. Carmignani, F. Ewald, L. Farvacque, A. Franchi, L. Goirand, M. Hahn, L. Hardy, J. Jacob, J.M. Koch, G. Lebec, S.M. Liuzzo, B. Nash, T.P. Perron, E. Plouviez, P. Raimondi, K.B. Scheidt, V. Serrière ESRF, Grenoble, France
	Four years after the launch of the Upgrade Programme, the ESRF is midway through its first phase (2009-2015) and has defined the objectives for the ensuing second phase. The first phase paved the way to a new generation of nano-beam X-ray beamlines fed by an X-ray source itself substantially improved in terms of reliability, stability and brilliance. The second phase envisions a major upgrade of the source to best serve the science case of this new generation of beamlines. In December 2012, the ESRF Council endorsed Management's proposal to launch the technical design study of a new 7-bend achromat lattice. This new configuration will allow the ESRF storage ring to operate with a decrease in horizontal emittance by a factor of about 30 and a consequent increase in brilliance and coherence of the photon beam. The increase will be substantially higher at X-ray energies larger than 50 keV.
	Slides TUOAB203 [3.664 MB]

TUODB203	Dual Chip in Single Module Solid-State Power Amplifier Design for Compact Transmitter Architecture	insertion, impedance, booster, linac	1158
	T.-C. Yu, L.-H. Chang, M.H. Chang, L.J. Chen, F.-T. Chung, M.-C. Lin, Y.-H. Lin, Z.L. Liu, C.H. Lo, M.H. Tsai, Ch. Wang, T.-T. Yang, M.-S. Yeh NSRRC, Hsinchu, Taiwan
	At present, the high power solid-state technique transmitter design are composed of hundreds parallel combined single chip for hundreds Watts power modules to achieve enough output power. Although the large numbers can bring high redundancy during system operation, the power hungry of next generation RF system of accelerator would need much more modules to reach its power requirement. Huge amount of power modules would bring the complexity and difficulty in power combining, system construction, management and maintenance. To overcome this problem, upgrading the power level of a single module could be the solution. Besides depending on the power level growing with technology advancement in semiconductor industry, a circuit level solution to combine dual chip in advance in a single PCB board is proposed to produce twice power as single chip. Such feasible solution can overcome the over-complexity of future several-hundreds kW solid-state transmitter design.
	Slides TUODB203 [2.337 MB]

TUPEA028	Echo-enabled Harmonic Generation based on Hefei Storage Ring	FEL, electron, bunching, laser	1208
	H.T. Li, W.W. Gao, Q.K. Jia, L. Wang USTC/NSRL, Hefei, Anhui, People's Republic of China
	Echo-Enabled Harmonic Generation (EEHG) has been proposed and experimently demonstrated recently. In this paper, we numerically investigate the possibility of operating EEHG based on Hefei storage ring, which has a short circumference and a small momentum compaction factor. The difference to other similar reserch is that we use the whole ring as the first dispersive section and an optical klystron as the second one.

TUPFI049	Studies of 10 GeV Decay Ring Design for the International Design Study of the Neutrino Factory	insertion, injection, kicker, optics	1457
	D.J. Kelliher, C.R. Prior STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom N. Bliss, N.A. Collomb STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom A. Kurup, J. Pasternak Imperial College of Science and Technology, Department of Physics, London, United Kingdom J. Pasternak STFC/RAL, Chilton, Didcot, Oxon, United Kingdom H. Witte BNL, Upton, Long Island, New York, USA
	Due to the discovery of large θ13 the final muon storage energy in the baseline solution of International Design Study for the Neutrino Factory (IDS-NF) has been set at 10 GeV. A new racetrack design has been produced for the decay ring to meet this requirement. The details of lattice design and the beam dynamics calculations are discussed. The feasibility of the injection system for both positive and negative muons into the ring is explored in details.

TUPFI055	Stochastic Injection Scenarios and Performance for NuSTORM	injection, target, proton, simulation	1469
	D.V. Neuffer Fermilab, Batavia, USA A. Liu Indiana University, Bloomington, Indiana, USA
	At Fermilab, we are developing NuSTORM (Neutrinos from STORed Muons), a neutrino beam from muon decay in a long straight section of a storage ring. The baseline design for NuSTORM uses what was called “stochastic injection”. In that method, high-energy protons on a nuclear target produce pions that are directed by a chicane into a straight section of the storage ring. Pions that decay within that straight section can provide lower-energy muons that are within the circulating acceptance of the storage ring. This decay acceptance enables injection for multiple storage ring turns without kickers, and muon accumulation can be reasonably high. The design of a muon storage ring with pion injection is described and simulations of acceptance are discussed. Alternative injection approaches are also discussed.

TUPFI061	Preliminary Design of a Higgs Factory μ+μ- Storage Ring	quadrupole, dipole, collider, factory	1487
	A.V. Zlobin, Y.I. Alexahin, V.V. Kapin, V.V. Kashikhin, N.V. Mokhov, I.S. Tropin Fermilab, Batavia, USA
	Funding: Work supported by Fermi Research Alliance, LLC, under contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, and by the US Department of Energy through the Muon Accelerator Program (MAP). A Muon Collider offers unique possibilities for studying the recently found Higgs boson. Higgs bosons can be produced in reasonable amounts in the s-channel, so that the colliding muon beam energy of just 62.5GeV is required. Precision direct measurements of the Higgs boson mass and width is possible due to absence of brems- and beam-strahlung. At the same time, there are difficulties specific to muon colliders: relatively large beam emittance which necessitates quite small beta-function values (~ a few cm) at the interaction point in order to obtain sufficiently high luminosity, as well as superconducting magnet and detector protection from showers generated by muon decay products. Due to these factors, the required aperture of the final focus quadrupoles is very large (up to 0.5 m) posing challenging engineering constraints as well as beam dynamics issues with fringe fields. The first results of a complex approach to these problems in the Higgs Factory collider design are presented which promise luminosities in excess of 1031 cm^-2s⁻¹ with a 4 MW proton driver.

TUPME005	Preparations for Beam Tests of a CLIC Damping Wiggler Prototype at ANKA	wiggler, damping, emittance, target	1568
	A. Bernhard, E. Huttel, P. Peiffer KIT, Karlsruhe, Germany A.V. Bragin, N.A. Mezentsev, V.M. Syrovatin, K. Zolotarev BINP SB RAS, Novosibirsk, Russia P. Ferracin, D. Schoerling CERN, Geneva, Switzerland
	The Compact Linear Collider (CLIC) will require ultra-low emittance electron and positron beams. The targeted emittance will be achieved by radiative damping in the CLIC damping rings. For an efficient damping high-field short-period superconducting damping wigglers will be employed. In the conceptual design phase of CLIC, the basic layout of these wigglers has been elaborated at CERN. In the course of the CLIC technical feasibility studies a full-scale damping wiggler prototype will be installed and tested in the ANKA storage ring. The device is currently under design and construction at the Budker Institute of Nuclear Physics, Russia. Above the magnetic requirements, the main design challenges for the prototype are scalability –- particularly of the cooling concept –-, modularity and the capability of sustaining a high radiative heat load. The experiments at ANKA aim at a validation of the technical concepts applied to meet these requirements. Beyond that an extended experimental program on beam dynamics and alternative technical solutions is envisaged. This contribution gives an overview over the current status of the project and the further planning.

TUPME025	Calculation of the Equilibrium Parameters for the Compact Ring of TTX	emittance, photon, scattering, electron	1625
	H.S. Xu, W.-H. Huang, C.-X. Tang TUB, Beijing, People's Republic of China S.-Y. Lee IUCEEM, Bloomington, Indiana, USA
	Intra-Beam Scattering (IBS) can cause emittance growth in high intensity low energy beams. We study its effect on the compact low energy electron storage ring, proposed for Tsinghua Thomson Scattering X-ray source (TTX). For a single bunch with peak current at about 17A and re-entrant type normal conducting RF cavity with peak voltage at 15kV, the equilibrium horizontal and vertical emittances are 2.9 and 0.3 μm, and the rms momentum spread and bunch length are about 0.2%, and 23ps. In this paper, we report the methods and results of the IBS calculation.

TUPME053	General Beam Loading Compensation in a Traveling Wave Structure	beam-loading, bunching, linac, electron	1688
	H. Shaker, S. Döbert CERN, Geneva, Switzerland H. Shaker IPM, Tehran, Iran
	The well-known beam loading in a traveling wave structure is in fact a resistive beam loading which bunches travel on the crest. This type of beam loading could be compensated by increasing RF feed power. But generally, bunches could travel on each phase. General beam loading compensation is well-known for a single cell cavity and it is done by changing the RF feed power and detuning the structure together. In this paper, the concept of detuning for a TW structure will be shown and the evolution of fundamental mode beam-induced field will be derived and finally, it will be shown how to compensate beam loading by changing the phase velocity in comparison to the beam velocity.

TUPWA003	Beam Based Magnet Alignment for Emittance Coupling Minimization	sextupole, quadrupole, emittance, 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.

TUPWA015	The Study of Bunch Lengthening in Electron Storage Ring	impedance, synchrotron, luminosity, electron	1757
	Y. Li, L. Wang, Y. Zhang IHEP, Beijing, People's Republic of China
	The bunch length of electron storage ring of BEPCII was measured repeatedly during steady synchronous mode and streak camera was calibrated well. From the bench lengthening , the coupling impedance of the whole ring was estimated, which was according with theoretic impedance budget . Meanwhile, the small ap optics for improving the luminosity was feasible in collision mode form synchronous result .

TUPWA030	Impedances Calculations of Bellows in HLS II Storage Ring	impedance, wakefield, shielding, coupling	1784
	Q. Zhang, W. Li, L. Wang USTC/NSRL, Hefei, Anhui, People's Republic of China
	The upgrade project of Hefei Lighe Source storage ring is carrying on.In this project,a new Bellows, in which shielding is provided by sprung fingers which can slide along the beam screen,is installed at the accelerator interaction area In order to reduce this impedance to an acceptable value. The contributions of Bellows to short range wakefields and broadband impedance were calculated numerically by Mafia code .

TUPWA038	Equilibrium Bunch Density Distribution with Passive Harmonic Cavities in the MAX IV 3 GeV Storage Ring	cavity, impedance, emittance, damping	1790
	P.F. Tavares, Å. Andersson, A. Hansson MAX-lab, Lund, Sweden
	The MAX IV storage rings will use third harmonic cavities operated passively to lengthen the bunches and alleviate collective instabilities. These cavities are an essential ingredient in the MAX IV design concept and are required for achieving the final design goals in terms of stored current, beam emittance and beam lifetime. This paper reports on fully self-consistent calculations of the longitudinal bunch density distribution in the MAX IV 3 GeV storage ring, which indicate that up to a factor 5 increase in RMS bunch length is achievable with a purely passive system.

TUPWA052	Loss Factor and Impedance Analysis for the Diamond Storage Ring	impedance, vacuum, wiggler, simulation	1826
	R. Bartolini, R.T. Fielder, C.A. Thomas Diamond, Oxfordshire, United Kingdom
	Diamond Light Source is investigating the possibility of increasing the storage ring operating current above the nominal 300 mA. A campaign of measurements and simulations has been carried out in order to understand the extent of the parasitic energy loss and characterise the most important items which build up the machine impedance. In this paper we report on the most recent measurements of the longitudinal loss factor and the present status of the impedance database with an initial comparison between the two.

TUPWO031	Double-mini-beta Optics for the SSRF Storage Ring	optics, dynamic-aperture, emittance, injection	1943
	S.Q. Tian, B.C. Jiang, M.Z. Zhang, Z.T. Zhao SINAP, Shanghai, People's Republic of China
	The two long straight sections of the SSRF storage ring will be installed by dual canted in-vacuum insertion devices in the near future. In order to get high brightness and maintain good machine performance, the vertical beta function must be reduced by a triplet of quadrupole between the two source points, which is the so-called double-mini-beta optics. We have designed this kind of optics for SSRF, and the results are presented in this paper.

TUPWO040	Asymmetric Energy Colliding Ion Beams in the EDM Storage Ring	ion, proton, dipole, controls	1961
	I. Koop BINP SB RAS, Novosibirsk, Russia
	A possibility to bent equally two counter rotating ion beams by the crossed electric and magnetic fields is investigated. The first beam is polarized and its spin precession is adjusted to be synchronous with the velocity vector precession (a frozen spin method). The counter rotating unpolarized ion beam travels along the same orbit but with different velocity. Sensitive SQUID-type BPMs measure the vertical orbit difference of two beams. Later on this information is used to distinguish the EDM signal from the magnetic moment precession. Application of this approach to search of the EDM for proton, deuteron and helion is discussed.

TUPWO042	Modeling Results from Magnetic and Beam Based Measurements of the ALBA Gradient Dipoles	dipole, focusing, lattice, quadrupole	1967
	X. Gavaldà SOLEIL, Gif-sur-Yvette, France G. Benedetti, J. Marcos, Z. Martí CELLS-ALBA Synchrotron, Cerdanyola del Vallès, Spain
	The ALBA lattice is a DBA-like structure where most of vertical focusing is provided by gradient dipoles. In the first year of machine operation, the model parameters describing the focusing strength of the 32 dipoles have been calibrated by fitting the measured closed orbit response matrix. The mean k-value obtained from this analysis differs by -0.3% with respect to the value taken from the magnetic measurements previous to the magnet installation, while the k variation within the 32 dipoles is of the same order of magnitude. The optics results (tunes, beta beating, dispersion) obtained with the beam based model are compared with the predicted ones from the magnetic measurement model.

TUPWO063	Reducing HLS-II Emittance by Radiation Damping Partition Factor Exchange	wiggler, emittance, damping, lattice	2009
	J.Y. Li FEL/Duke University, Durham, North Carolina, USA W. Li, G. Liu, W. Xu USTC/NSRL, Hefei, Anhui, People's Republic of China Y. Li BNL, Upton, Long Island, New York, USA
	Funding: The Introduction of Outstanding Technological Talents Program of Chinese Academy of Sciences, 2010. In this paper, we present a preliminary study on using a Robinson wiggler, a wiggler with transverse gradient, to reduce the horizontal beam emittance of the Hefei Light Source II (HLS-II) storage ring. A proof-of-principle study demonstrates that it is possible to further reduce the horizontal beam emittance by 50\% using a 2-meter long Robinson wiggler installed on a dispersive straight section. This encouraging result suggests a feasible option to significantly improve the HLS-II performance at a relative low cost and without significant modification to its global configuration in the near future.

WEOBB202	Ultra-fast Data Acquisition System for Coherent Synchrotron Radiation Based on Superconducting Terahertz Detectors	synchrotron, radiation, electron, controls	2094
	C.M. Caselle, M. Hofherr, K.S. Ilin, V. Judin, A. Kopmann, A. Menshikov, A.-S. Müller, M. Siegel, N.J. Smale, P. Thoma, M. Weber, S. Wuensch KIT, Eggenstein-Leopoldshafen, Germany B.M. Balzer, S. Cilingaryan Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
	The ANKA synchrotron radiation source located at the Karlsruhe Institute of Technology in Germany operates in the energy range between 0.5-2.5GeV and provides coherent synchrotron radiation. To resolve the ultra-short terahertz pulses emitted by a single bunch, thin YBCO superconducting film detectors have been developed. A response time of 45ps was determined as the FWHM at the output of the analog amplifier. A novel and high accuracy data acquisition architecture for sampling of the individual ultra-short terahertz pulses combined with real-time data processing based on GPUs for coherent synchrotron radiation is presented. The digitizer board is a made-in-house board designed for sampling of the fast pulse signals with pulse width between few tens of picosecond until 100ps. For each terahertz pulse five samples are acquired with a minimum sampling time of 3ps. A prototype setup with terahertz YBCO detectors, digitizer boards and the high-throughput FPGA framework has been successfully developed and tested at ANKA. The overview of the experimental setup including the YBCO detector technology and the preliminary results with single and multi-bunch filling pattern will be discussed.
	Slides WEOBB202 [2.416 MB]

WEIB204	Industry and Science, POSCO and POSTECH Case	linac, site, FEL, klystron	2115
	W. Namkung PAL, Pohang, Kyungbuk, Republic of Korea
	Funding: * Supported by MEST and POSTECH POSCO is a world-leading iron and steel company established in 1968 in Pohang, in the South East coast of Korea. Starting with 1.0 million ton size in 1973, the company made profits even in the first year. While its capacity has been increased to 40 million tons with another works in Gwangyang, POSCO paid attention on education to attract intellectuals to Pohang and Korea. It results in establishing a small-sized university, Pohang University of Science and Technology (POSTECH) in 1987. POSTECH immediately decided to construct a third generation synchrotron light source of 2.0 GeV, Pohang Light Source (PLS) on its campus in 1988, with support from POSCO and also Government. POSTECH achieved a high rank in the world, and PLS is upgraded to 3.0 GeV in 2011. A new PAL-XFEL of 10.0 GeV is now under construction. POSCO's consistent policy is the key of the success of POSTECH and Pohang Light Source. This is an unprecedented example of the relationship between industry and science.
	Slides WEIB204 [4.759 MB]

WEPWA012	Preliminary Design of Transfer Lines for the ILSF Accelerator Complex	booster, linac, synchrotron, electron	2153
	H. Ghasem IPM, Tehran, Iran E. Ahmadi, F. Saeidi ILSF, Tehran, Iran
	There are two transfer lines (T-lines) which link the Iranian Light Source Facility (ILSF) accelerator complex to gather. Several criterias have been considered in design stage of the T-lines. This paper gives linear optimization results of the designed T-lines based on the first layout of the ILSF.

WEPWA013	Injection Scheme into the High Field ILSF Storage Ring	kicker, electron, injection, booster	2156
	H. Ghasem IPM, Tehran, Iran E. Ahmadi, F. Saeidi ILSF, Tehran, Iran
	The injection system into a storage ring of a synchrotron radiation facility significantly affects quality of the electron beam and the radiated x-ray. The extracted 3 GeV electron beam from the booster synchrotron of the ILSF is transferred via the BTS transfer line and injected into the ILSF storage ring based on high field lattice structure. This paper describes the injection procedure into the ILSF storage ring and gives the electron tracking results of the injected beam.

WEPWA016	Production of Intense High Energy Gamma Beam for LEPS2 Project at SPring-8	laser, injection, electron, scattering	2162
	T. Yorita, T. Hotta, N. Muramatsu, T. Nakano, M. Oka, M. Yosoi RCNP, Osaka, Japan S. Daté, Y. Ohashi, H. Ohkuma, M. Oishi, Y. Okayasu, M. Shoji, S. Suzuki, Y. Taniuchi JASRI/SPring-8, Hyogo-ken, Japan
	Construction of new beam line for LEPS2 Project at SPring-8 has been done and development is now undergoing. LEPS2 is the project for high energy hadron physics using intense high energy gamma beam as probe. The gamma beam is produced by laser backward Compton scattering with injecting high power UV laser into the 8 GeV electron beam on long straight section of SPring-8 storage ring. The target intensities are ~10⁷/s for E_γ=2.4 GeV, ~10⁶/s for E_γ=2.9 GeV.

WEPWA018	Pulsed Sextupole Injection for BAPS	injection, sextupole, emittance, septum	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.

WEPWA020	Laser Electron Storage Ring for TTX	cavity, laser, electron, quadrupole	2171
	H.S. Xu, W.-H. Huang, C.-X. Tang, L.X. Yan, Y. You TUB, Beijing, People's Republic of China D. Jehanno, Z.F. Zomer LAL, Orsay, France S.-Y. Lee IUCEEM, Bloomington, Indiana, USA
	Tsinghua Thomson scattering X-ray (TTX) source, proposed by Tsinghua University, is a hard x-ray source with multi-application in condensed matter physics, etc. The TTX is composed of an S-band photocathode RF gun and a SLAC type 3m travelling wave Linac, and a femto-second tera-watt laser system drives the photocathode. The TTX source is in operation. To extend the capability of TTX, we plan to design a ring based system to increase the photon flux. In this paper, we report the design of the compact electron storage ring and optical cavity, expected performance, and future prospects.

WEPWA035	Design of a Superconducting Undulator Magnet Prototype for SSRF	undulator, superconductivity, synchrotron, electron	2205
	Z.C. Zhang, J. Cui, J.Y. Jiang, M. Li, W. Li, J.P. Xu, J.J. Xu, J.F. Yu SINAP, Shanghai, People's Republic of China
	Funding: Project 11275254 supported by National Natural Science Foundation of China. A 0.65 T NbTi superconducting undulator magnet prototype with a period length of 16 mm and a period number of 5 for SSRF is designed. The magnetic field simulation shows that it is possible to obtain a peak field of 0.6 T on the beam axis at a magnetic gap of 9 mm, with a current density of 800A/mm2 in the superconducting coils. Two coil formers are machined from SAE10¹⁸ stainless steel and coated with TiO2 for insulation. The dimension of the grooves of the coil windings in the coil formers is 5 mm x 10 mm. Formvar insulated NbTi superconducting wires with a diameter of 0.6 mm are used for the 128 turn coils per core groove. A five periods core of NbTi superconducting magnet is machined from SAE1018 stainless steel and winded with copper wires.

WEPWA049	Top-up Safety Simulations for the ALBA Storage Ring	dipole, quadrupole, sextupole, simulation	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.

WEPWA060	The Kharkov X-ray Generator Facility NESTOR	electron, lattice, controls, injection	2253
	A.A. Shcherbakov, V.P. Androsov, N. Ayzatsky, V.N. Boriskin, E.V. Bulyak, A.N. Dovbnya, P. Gladkikh, A.N. Gordienko, V.A. Grevtsev, A. Gvozd, V.E. Ivashchenko, A.A. Kalamayko, I.I. Karnaukhov, I.M. Karnaukhov, V.P. Kozin, V.A. Kushnir, V.P. Lyashchenko, V.S. Margin, N.I. Mocheshnikov, V.V. Mytrochenko, A. Mytsykov, I.M. Neklyudov, T.F. Nikitina, F.A. Peev, O.V. Ryezayev, V.L. Skirda, V.A. Skomorokhov, Y.N. Telegin, V.I. Trotsenko, A.Y. Zelinsky, O.D. Zvonarjova NSC/KIPT, Kharkov, Ukraine J.I.M. Botman TUE, Eindhoven, The Netherlands I.V. Drebot LAL, Orsay, France
	The last few years the sources of the X-rays NESTOR based on a storage ring with low beam energy and Compton scattering of intense laser beam are under design and development in NSC KIPT. The main task of the project is to develop compact intense X-ray generator on the base of relatively cheap accelerator equipment and up-to-date laser technologies. The paper is devoted to description of the last results on construction and commissioning of the facility.

WEPWA075	High-gain X-ray FELs using a Transverse Gradient Undulator in an Ultimate Storage Ring	FEL, undulator, emittance, electron	2286
	Y.T. Ding, P. Baxevanis, Y. Cai, Z. Huang, R.D. Ruth SLAC, Menlo Park, California, USA
	An “ultimate” storage ring based on PEP tunnel has been designed to achieve diffraction limited emittance (at 1.5 Angstrom)[]. With sufficient peak current, the beam brightness of such an “ultimate” storage ring may be sufficient to drive a short-wavelength, high-gain FEL. However, the large energy spread intrinsic to storage rings hinders the FEL applications for x-ray wavelengths. To overcome this problem, we adopt the transverse-gradient undulator concept[][*] to study a high-gain FEL in an ultimate storage ring. Using PEP-X as an example, we showed from simulations that a high-gain FEL at the photon energy 1keV with a peak power of a few hundred megawatts can be achieved within a saturation length of 100 meters. Y. Cai et al., Phys. Rev. ST Accel. Beams 15, 054002 (2012). T. Smith et al., J. Appl. Phys. 50, 4580 (1979) * Z. Huang, Y. Ding and C. B. Schroeder, Phys. Rev. Lett 109, 204801 (2012).

WEPWO041	Beam Commissioning Superconducting RF Cavities for PLS-II Upgrade	SRF, cavity, vacuum, LLRF	2390
	Y.U. Sohn, M.-H. Chun, J.Y. Huang, Y.D. Joo, S.H. Nam, C.D. Park, H.J. Park, I.S. Park, I.H. Yu PAL, Pohang, Kyungbuk, Republic of Korea
	Two superconducting RF cavities were commissioned with electron beam at PLS-II, which is upgraded machine from PLS with 3 GeV, 20 insertion devices, and now on user service. These srf cavities have been prepared during last 3 years. Each cavity was tested with higher than 2 MV rf voltage and 125 kW standing wave power at CW mode after installation at storage ring. PLS-II is on user operation with 200 mA beam current now, and on the way of beam current improvement upto 400mA, by synchrotron conditioning for beam chamber and in-vacuum udulators. Upto 200 mA beam current no beam instability from the higher order modes is observed. With top-up mode operation, the errors of amplitude of rf field and phase are recorded as 0.3% and 0.3 degree peak to peak, respectively during one day. Successful PLS-II upgrade with hardware and its designed performance will be declared at the end of 1st half user run in 2013.

WEPEA012	Study of Laser Wakefield Accelerators as Injectors for Synchrotron Light Sources	laser, synchrotron, lattice, simulation	2519
	S. Hillenbrand, V. Judin, A.-S. Müller KIT, Karlsruhe, Germany R.W. Aßmann, S. Hillenbrand CERN, Geneva, Switzerland O. Jansen, A.M. Pukhov HHUD, Dusseldorf, Germany
	Short bunch lengths, high beam energies, and small facility footprint make Laser Wakefield Accelerators (LWFA) very interesting as injectors for Synchrotron Light Sources. In this paper, we describe exemplary investigations for the ANKA storage ring.

WEPEA025	Chromatic Sextupole Pair Optimization Methods for Enlarging Dynamic Aperture	sextupole, lattice, dynamic-aperture, focusing	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, sextupole, betatron, 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.

WEPEA037	Testing of Symplectic Integrator of Spin-orbit Motion Based on Matrix Formalism	simulation, lattice, electromagnetic-fields	2582
	A.N. Ivanov, S.N. Andrianov, N.V. Kulabukhova St. Petersburg State University, St. Petersburg, Russia R. Maier, Y. Senichev, D. Zyuzin FZJ, Jülich, Germany
	Investigation of spin-orbital motion in electromagnetic fields requires different numerical methods. Approaches for long-term evolution modelling need both performance and symplecticity. In this paper we discuss matrix maps method for numerical simulation. We examine symplectification and accuracy in terms of electostatic storage ring. The results are compared with traditional symplectic step-by-step methods.

WEPEA067	Beam Optics Measurements through Turn by turn Beam Position Data in the SLS	betatron, optics, luminosity, positron	2663
	P. Zisopoulos, Y. Papaphilippou CERN, Geneva, Switzerland A. Streun PSI, Villigen PSI, Switzerland V.G. Ziemann Uppsala University, Uppsala, Sweden
	Refined Fourier analysis of turn-by-turn (TBT) transverse position data measurements can be used for determining several beam properties of a ring, such as transverse tunes, optics functions, phases, chromatic properties and coupling. In particular, the Numerical Analysis of Fundamental Frequencies (NAFF) algorithm is used to analyze TBT data from the Swiss Light Source (SLS) storage ring in order to estimate on and off-momentum beam characteristics. Of particular interest is the potential of using the full position information within one turn in order to measure beam optics properties.

WEPFI004	Commissioning of First 352.2 MHz - 150 kW Solid State Amplifiers at the ESRF and Status of R&D	booster, cavity, HOM, status	2708
	J. Jacob, L. Farvacque, G. Gautier, M.L. Langlois, J.M. Mercier ESRF, Grenoble, France
	Funding: This work receives funding from the EU as work package WP7 in the FP7/CRISP project. Four 352.2 MHz - 150 kW Solid State Amplifiers (SSA), based on the SOLEIL design and supplied by ELTA/AREVA, are in operation on the ESRF booster since April 2012. A number of interesting effects were observed during commissioning that are inherent to the combination of many RF amplifier modules at high power. While it has only little impact on the booster SSA operated in pulsed regime, some modifications were necessary for the three SSAs that will be delivered by ELTA for an operation in CW on the storage ring. In parallel, the ESRF is developing a more compact SSA using cavity combiners *) instead of the widely adopted coaxial combiner trees. The status of this R&D project will also be reported.

WEPFI012	Conceptual Design of ILSF RF System	cavity, HOM, LLRF, impedance	2723
	Kh.S. Sarhadi, H. Ajam, H. Azizi, M. Fereidani, M. Jafarzadeh, S. Pirani, J. Rahighi, R. Safian, A. Shahverdi ILSF, Tehran, Iran
	The Iranian Light Source Facility (ILSF) RF system, consisting of RF cavities, power sources and low-level RF systems, is conceptually designed in accordance with the requirements of ILSF 3GeV storage ring. To achieve the desired 400mA beam current, utilization of the existing HOM-damped cavities is explored and RF system parameters are compared based on the usage of each cavity. Moreover, the choice of solid state amplifier as the RF power source is presented with its available power and structure. This paper, furthermore, explains the conceptual design and functionality of the selected digital LLRF system.

WEPFI033	Development of the HLS 40kW Solid State Amplifier	rf-amplifier, power-supply, damping, synchrotron	2777
	L. Lin, G. Huang, C. Li, Y.T. Liu, W. Zhou USTC/NSRL, Hefei, Anhui, People's Republic of China
	A 40kW RF Solid State Amplifier (SSA) will replace the 25kW tetrode amplifier as the new RF power generator of HLS 800MeV electron storage ring. This SSA contains sixty-five 650W amplifier units (one unit drives sixty-four’s), with two-stage combination to reach the 40kW output. All of the components of SSA are prepared and tested, each of them meets the design requirements. The SSA has been assembled, and is in off-line testing now. The process of SSA’s design and manufacture, and the test results are presented in this paper.

WEPFI060	Planar Balun Design with Advanced Heat Dissipation Structure for kW Level Solid-state Amplifier Module Development	coupling, controls, impedance, klystron	2830
	T.-C. Yu, L.-H. Chang, M.H. Chang, L.J. Chen, F.-T. Chung, M.-C. Lin, Y.-H. Lin, Z.L. Liu, C.H. Lo, M.H. Tsai, Ch. Wang, T.-T. Yang, M.-S. Yeh NSRRC, Hsinchu, Taiwan
	The power level of solid-state amplifier is continuously growing for advanced accelerator application as the RF power source. Huge amount of solid-state power amplifier (SSPA) modules can contribute several hundreds of kW RF power with high redundancy and reliability. However, with the increasing desire of RF power of single RF station, too much power modules would adversely cause larger area occupation and higher maintenance cost and complexity. Therefore, with the advancement of the RF power on single SSPA, the overall system design and configuration would become much simple and compact. However, the increasing RF of single SSPA would also bring the thermal problem at its chip as well as the output power combining balun. In this paper, kW range SSPA is developed with the novel planar balun structure with good thermal expansion property. With such new planar balun design, the SSPA can operate stably with above 1kW output RF power.

WEPFI061	Petra Cavity Vacuum RF Condition with Field Balance Mechanism for TPS Storage Ring in NSRRC	cavity, coupling, vacuum, controls	2833
	T.-C. Yu, L.-H. Chang, M.H. Chang, L.J. Chen, F.-T. Chung, M.-C. Lin, Y.-H. Lin, Z.L. Liu, C.H. Lo, M.H. Tsai, Ch. Wang, T.-T. Yang, M.-S. Yeh NSRRC, Hsinchu, Taiwan
	In the first stage commissioning of TPS (Taiwan Photon source) storage ring in NSRRC, two room temperature Petra cavities will be used. At this commission stage, 100mA with 950keV beam loss is estimated to have 47.5kW beam loss for each cavity. In the meanwhile, the cavity loss at the specified 1.2MV of each cavity will be about 50kW. Therefore, coupling coefficient of 2 is required. However, the initial design specification of Petra cavity has only beta of about 1.7. Hence, the modification of the input coupler is done with the enhancement of its beta as well as advanced water cooling for some heat point. Besides, due to the two-tuner system of Petra cavity, special field-balance tuner control system is also developed. In RF condition for better vacuum up to 1.4MV, some modification of the tuner mechanical structure is also done to reach high vacuum condition (lower than 5*10^-9 Torr) for storage ring requirement.

WEPME037	Fast Orbit Feedback at Taiwan Photon Source	brilliance, controls, feedback, EPICS	3007
	A. Bardorfer, P. Leban I-Tech, Solkan, Slovenia P.C. Chiu, K.T. Hsu, C.H. Kuo NSRRC, Hsinchu, Taiwan
	Low latency, distributed, Fast Orbit Feedback (FOFB) application, based on singular value decomposition, entirely implemented in FPGA, has been developed for the Taiwan Photos Source (TPS). The FOFB utilizes the latest Libera Brilliance⁺ units for measuring beam position and the Gigabit Data eXchange (GDX) modules, which take care of global orbit distribution via 6.5 Gbit/s fiber optic or passive Cu links, and provide a large orbit data history buffer. The magnet correction in a matrix form of M = V . PI( S^-1 . U^T . ( Golden-Orbit ) ) is calculated entirely in FPGA, using a massively parallel approach and sent to the magnet power supplies via 2.5 Gbit/s link. The entire FOFB calculation is distributed over 48 GDX modules and the system allows for synchronous (on/off/pause) FOFB control via external input signal. The latencies of 60 ns per BPM for orbit distribution, 1.5 us for FOFB calculation and 1.5 us for magnet data transmission have been measured at TPS test installation in November 2012. The expected total communication and FOFB calculation latency in the TPS final configuration (168 BPMs) is expected to stay within 15-20 us range.

WEPME048	Adjusting and Calibration Method for TPS Laser PSD System	laser, alignment, factory, synchrotron	3037
	M.L. Chen, J.-R. Chen, P.S.D. Chuang, H.C. Ho, K.H. Hsu, D.-G. Huang, W.Y. Lai, C.-S. Lin, C.J. Lin, H.C. Lin, H.M. Luo, S.Y. Perng, P.L. Sung, T.C. Tseng, H.S. Wang, M.H. Wu NSRRC, Hsinchu, Taiwan J.-R. Chen National Tsing Hua University, Hsinchu, Taiwan
	Laser PSD positioning system is a part of the TPS girder auto-alignment system and is designed for aligning and positioning the straight-section girders of TPS storage ring. Although the components of Laser PSD system are fabricated, assembling and adjusting precisely in advance, the accuracy of Laser PSD system is still influenced by girder fabricating quality, assembling errors and moving errors by transportation. For system correction, Laser beam positions on four sets of PSDs are formulized as an equation and calibrated with Laser tracker ultimately. According to the PSD calibration formula, the two girders of 18m long straight-section can be aligned and positioned within 20um by comparing with Laser tracker. This paper describes the assembly, installation and calibration process of Laser PSD system.

WEPME050	Alignment Design and Status of Taiwan Photon Source	survey, alignment, laser, site	3043
	W.Y. Lai, J.-R. Chen, M.L. Chen, P.S.D. Chuang, H.C. Ho, K.H. Hsu, D.-G. Huang, C.K. Kuan, C.-S. Lin, C.J. Lin, H.C. Lin, H.M. Luo, S.Y. Perng, P.L. Sung, T.C. Tseng, H.S. Wang, M.H. Wu NSRRC, Hsinchu, Taiwan J.-R. Chen National Tsing Hua University, Hsinchu, Taiwan
	Taiwan Photon Source (TPS) is a new 3-GeV ring with characteristics of great brightness and small emittance, at present under construction at National Synchrotron Radiation Research Center (NSRRC) Taiwan. The positioning of the magnets is highly sensitive to alignment errors, and the entire building will be constructed half underground at depth 12 m relative to Taiwan Light Source (TLS) for stability reasons; for these reasons the survey and alignment work is confined and difficult. To position magnets precisely and quickly, a highly accurate auto-tuning girder system combined with a survey network was designed to accomplish the alignment tasks. The survey network includes a preliminary Global Positioning System (GPS) network and a laser tracking network. The position data from the survey network define a basis for the system of motorized girders to auto-tune and to improve the accuracy. The detailed survey and alignment design, installation process is described in this paper.

WEPME054	Girder Alignment in the Diamond Storage Ring	survey, alignment, controls, quadrupole	3052
	M. Apollonio, R. Bartolini, W.J. Hoffman, A.J. Rose, A. Thomson Diamond, Oxfordshire, United Kingdom R. Bartolini JAI, Oxford, United Kingdom
	A model of the Diamond Storage Ring describing the misalignment of its 74 girders in terms of displacements and rotations is used to predict the orbit distortions and corrector magnet strengths needed for a zero orbit. Using the data from a survey we compare the effect of a pure magnet misalignment with the natural orbit of the machine. A test with a displaced girder meant to produce a reduction in corrector strength is introduced. Comparison with data obtained from the actual move of the girder is presented and discussed.

WEPME056	Application of Z-transform to Noise Response Modeling of a Bunch-by-bunch Feedback System	feedback, lattice, pick-up, monitoring	3058
	C. Yao, N.P. Di Monte, A.J. Scaminaci, H. Shang ANL, Argonne, USA
	Funding: Work supported by the U.S. Department of Energy, Office of Science, under Contract No. DE-ACO2-O6CH11357. The APS storage ring has an electron beam energy of 7 GeV and a single current of up to 16 mA. Transverse beam instability is corrected by a combination of chromatic correction and bunch-by-bunch feedback system. Noises produced in the pickup circuits is processed and transferred to the beam the same as a beam signal, which contributes to beam motion when the loops are closed. By analyzing the input data stream of the feedback system, one can passively obtain useful information, such as the tunes, loop stability, noise spectrum, etc. This approach has been reported by J. Klute and D. Teytelman. We implemented a passive and continuous tune monitoring process at the APS storage ring. In order to understand the underlying principle, we applied z-transform analysis to the noise-response model of a bunch-by-bunch feedback system. Our analysis shows a clear relationship between the spectrum of the noise response and the open-loop response of the beam. The noise-response model can also be applied to other areas, such as stability and noise analysis of a bunch-by-bunch feedback system. This report presents our analysis and some experimental data.

THPEA019	A Method of Implementing HIRFL-CSR Chopper Controls	controls, heavy-ion, ion, target	3185
	K. Gu, S. An, X.J. Liu, W. Zhang IMP, Lanzhou, People's Republic of China
	A method of implementing controls of chopper for HIRFL-CSR (Heavy Ion Research Facility of Lanzhou and Cooler Storage Rings) is introduced. This method is based on an ARM and DSP co-operation system. The control algorithm of this method is based on a data structure which is defined and implemented in the DSP module. Output data is created by the control algorithm and the actually pulse output is triggered by a timer which is achieved through a logic circuit actualized in a FPGA chip. The results show that the method is flexible and the control system matches the chopper regulating requirements.

THPEA055	NESTOR Facility Control System	controls, power-supply, monitoring, vacuum	3267
	D.V. Tarasov, V.N. Boriskin, I.M. Karnaukhov, D. Korzhov, V.N. Ljashchenko, A. Mytsykov, A.A. Shcherbakov, V.L. Skirda, V.I. Trotsenko, A.Y. Zelinsky NSC/KIPT, Kharkov, Ukraine
	The general principles of the NESTOR facility control system are presented in the paper. The main features of the systems such as magnetic, vacuum, diagnostic, Rf etc. concerning the control and monitoring are discussed. The first results of the system implementation are presented.

THPEA057	Compensation Schemes for Operation of FEL Wigglers on Duke Storage Ring	wiggler, FEL, lattice, quadrupole	3270
	J.Y. Li, H. Hao, S.F. Mikhailov, V. Popov, W. Wu, Y.K. Wu FEL/Duke University, Durham, North Carolina, USA
	Funding: This work is supported in part by the US DOE grant no. DE-FG02-97ER41033. The Duke FEL is the photon driver for the High Intensity Gamma-ray Source (HIGS). To extend the capabilities of the FEL and HIGS to higher photon energy regions, a FEL wiggler switchyard system was developed in the recent years. This system was installed and commissioned in 2012. The FEL wiggler switchyard is used to change between two planar OK-4 wigglers and two helical OK-5 wigglers in the middle of the FEL straight section in a short period of time (a few days). With a total of six electromagnetic wigglers, the Duke FEL can be operated in a number of wiggler configurations and with a wide range of magnetic fields. The operation of uncompensated FEL wigglers can cause significant changes to the electron beam closed orbit and magnetic lattice. To maintain a sufficiently large dynamic aperture for an efficient injection and good beam lifetime, a set of complex compensation schemes, including magnetic field and lattice compensation, have been developed for the operation of the FEL wigglers. This paper reports the overall architecture and performance of the FEL wiggler compensation schemes and their implementation in the accelerator controls system using the feedforward mechanism.

THPFI043	The Status of the Vacuum System of the MAX IV Laboratory	vacuum, dipole, injection, status	3382
	E. Al-Dmour, J. Ahlbäck, D. Einfeld, M.J. Grabski, P.F. Tavares MAX-lab, Lund, Sweden Ł. Walczak Solaris, Kraków, Poland
	All the vacuum chambers of the 3 GeV storage ring of MAX IV laboratory are under production. NEG coating R&D has been done to validate technical solutions for the coating process. The standard vacuum chambers for the 1.5 GeV ring of MAX IV and Solaris are designed and they are in the procurement process. We present an update in the technical design of the vacuum chambers following the interaction with the manufacture, the implications on the production due to NEG coating and the design of the vacuum chambers of the 1.5 GeV storage ring.

THPFI067	The Mechanical Design, Fabrication, and Performance of the DCCT for TPS	vacuum, shielding, electron, high-voltage	3451
	C.-C. Chang, C.K. Chan, J.-R. Chen, G.-Y. Hsiung, H.P. Hsueh NSRRC, Hsinchu, Taiwan J.-R. Chen National Tsing Hua University, Hsinchu, Taiwan
	This paper describes the DC current transformers (DCCT), designed and fabricated for Taiwan Photon Source (TPS); including the mechanical structure, dissimilar material welding process for the DCCT chamber, electronically and vacuum performance testing. In the structure, a ceramic break disc is provided and jointed between to ends of the beam duct. The electrical connection path is interrupted in the beam duct adjacent to the transformer. To avoid the sensor measured the wall current and other unnecessary circulating currents. The DCCT toroid is independent installed outside of a vacuum beam duct to measure the average beam current. In order to reduce the influence of external magnetic field for the sensor, two layers of Mu metal shell are installed. The performance and progress for the DCCT are described in this paper.

THPFI068	Status of the Utility System Construction for the 3 GeV TPS Storage Ring	controls, booster, status, synchrotron	3454
	J.-C. Chang, W.S. Chan, J.-R. Chen, Y.F. Chiu, Y.-C. Chung, C.W. Hsu, K.C. Kuo, Y.-C. Lin, C.Y. Liu, Y.-H. Liu, Z.-D. Tsai, T.-S. Ueng NSRRC, Hsinchu, Taiwan
	The construction of the utility system for the 3.0 GeV Taiwan Photon Source (TPS) was started in the end of 2009. The utility building for the TPS ring has been completed in the end of 2012. Main utility equipment has been installed inside. The whole construction of the utility system is scheduled to be completed in the mid of 2013. Total budget of this construction is about four million dollars. This utility system presented in this paper includes the electrical power, cooling water, air conditioning, compressed air and fire control systems.

THPFI077	Construction Status of the TPS Vacuum Systems	vacuum, ion, booster, photon	3472
	G.-Y. Hsiung, C.K. Chan, C.H. Chang, C.-C. Chang, S.W. Chang, Y.P. Chang, C.L. Chen, J.-R. Chen, Z.W. Chen, C.M. Cheng, Y.T. Cheng, S-N. Hsu, H.P. Hsueh, C.S. Huang, Y.T. Huang, T.Y. Lee, L.H. Wu, Y.C. Yang NSRRC, Hsinchu, Taiwan J.-R. Chen National Tsing Hua University, Hsinchu, Taiwan
	The vacuum systems for the 3 GeV Taiwan Photon Source (TPS) have been constructed since 2010. Most of the vacuum components and equipments have been manufactured and delivered. For the electron storage ring (SR), all the 24 cells of 14 m aluminum vacuum systems have been welded and assembled. The vacuum baking for the cells in the laboratory was undergoing to achieve the ultrahigh vacuum pressure below 1×10^-8 Pa. The vacuum systems accommodated with the insertion devices in the long straight sections have been designed and under manufacturing. For the booster (BR), all the stainless steel chambers including the 0.7 mm elliptical chambers, BPM ducts, and the pumping chambers, have been manufactured. The two transport lines: LTB for Linac to BR and BTS for BR to SR were manufactured. Vacuum chambers for BTS adopt the similar chambers for BR but will be baked to ultrahigh vacuum for connecting with SR without injection window. The beam ducts for LTB will be made of aluminum alloys. The construction works for TPS vacuum systems will be completed before April of 2013 while the installation of the systems in the TPS tunnel will be started immediately.

THPFI078	Design and Experiment on Auto-alignment Control System of Taiwan Photon Source	alignment, laser, controls, feedback	3475
	M.H. Wu, J.-R. Chen, M.L. Chen, P.S.D. Chuang, H.C. Ho, K.H. Hsu, D.-G. Huang, W.Y. Lai, C.-S. Lin, C.J. Lin, H.C. Lin, H.M. Luo, S.Y. Perng, P.L. Sung, T.C. Tseng, H.S. Wang NSRRC, Hsinchu, Taiwan J.-R. Chen National Tsing Hua University, Hsinchu, Taiwan
	TPS (Taiwan Photon Source) is a new 3-GeV synchrotron ring to be constructed at the NSRRC (National Synchrotron Radiation Research Center), Taiwan. There were hundreds of magnets that must be aligned on the absolute position to keep the electronic beam in the desire path while orbiting. Due to the problems of manpower, set up time, accuracy of adjustment, deformation of the floor, limited workspace and frequent earthquakes in Taiwan, an auto-alignment girder control system was designed to meet this requirement. The design and experiment of the auto-alignment system were tested successfully in the laboratory at NSRRC. The experiment of the auto-alignment control system would be implemented with half of the ring girders in the TPS. The detailed alignment design and status will be discussed in this paper.

THPFI079	Start-up of the NESTOR Facility Vacuum System	vacuum, electron, ion, synchrotron	3478
	A.Y. Zelinsky, A.N. Gordienko, V.A. Grevtsev, I.I. Karnaukhov, I.M. Karnaukhov, N.I. Mocheshnikov, A. Mytsykov, V.L. Skirda NSC/KIPT, Kharkov, Ukraine
	The Kharkov X-ray generator NESTOR based on Compton backscattering is under commissioning. The vacuum system of the complex integrates a linear accelerator-injector, the beam transport channel and the electron storage ring with energy range from 40 to 225 MeV. Elements of vacuum chambers, pumping facilities, cleaning surfaces procedures are described. Chambers are made of stainless steel (SS). After vacuum pretesting pressure 5 × 10^-9 Torr in the storage chambers ring achieved.

THPME011	Magnetic Field Design of the BAPS High Precision Quadrupole Magnet	quadrupole, multipole, photon, vacuum	3531
	Y.S. Zhu, F.S. Chen, W. Kang, X.J. Sun IHEP, Beijing, People's Republic of China
	The Beijing Advanced Photon Source (BAPS) is a high performance light source planned to be constructed in China. High precision small aperture quadrupole magnets are required in the BAPS storage ring, which needs extremely high mechanical accuracy. Instead of the conventional manufacture method, the coils are comprised of several U-shaped solid copper sheets. So two-piece structure of the iron core can be adopted to reduce assembly error and improve the poles symmetry. Design considerations, 2D and 3D magnetic field calculations are presented in detail, and the needed mechanical precision is estimated according to the error field analysis.

THPME013	MAGNET SUBSYSTEM OF HLS II	dipole, electron, quadrupole, beam-transport	3537
	Q. Luo, N. Chen, G. Feng, N. Hu USTC/NSRL, Hefei, Anhui, People's Republic of China
	Funding: Work supported by Natural Science Foundation of China 11005106 To improve the performance of the Hefei Light Source (HLS), in particular to get higher brilliance synchrotron radiation and increase the number of straight section insertion devices, NSRL is now upgrading HLS to HLS II. Most of the magnets had to be replaced in this project. To measure the magnets, set of the magnetic measurement equipment in NSRL are also re-built. New magnets are sample measured, the discreteness and uniformity of integrated magnetic field all meet the requirements. Piecewise fitting and electron tracking of bending magnets for injector and beam transport line were performed and the results showed that the electron trajectory fitted the physical design well.

THPME040	The Installation and Commissioning of the Helium Cryogenic System for theTPS Project	cryogenics, SRF, electron, controls	3600
	H.H. Tsai, S.-H. Chang, W.-S. Chiou, F. Z. Hsiao, C.K. Kuan, H.C. Li, T.F. Lin, C.P. Liu NSRRC, Hsinchu, Taiwan
	The construction of an electron accelerator with energy 3 GeV is under way for high brilliance and flux X-ray photon source at NSRRC. There will be eventually four superconducting radio frequency (SRF) cavities installed to maintain the electron energy. The helium cryogenic system has been designed and fabricated to provide the required liquid helium for SRF cavities. The cryogenic system consists of the 700-W refrigerator, the 315-kW variant frequency compressor, the oil removal system, the recovery compressor system, the gas helium buffer tanks, and one 7000-L liquid helium Dewar. The overall system installation and commissioning will be presented and discussed in this paper.

THPME052	Analysis of the NSLS-II Magnet Measurement Data	dipole, quadrupole, sextupole, 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.

THPWA045	Accelerator R&D in the QUASAR Group	antiproton, electron, ion, diagnostics	3732
	C.P. Welsch Cockcroft Institute, Warrington, Cheshire, United Kingdom C.P. Welsch The University of Liverpool, Liverpool, United Kingdom
	Funding: Work supported by the STFC Cockcroft Institute Core Grant No. ST/G008248/1, HGF and GSI under contract VH-NG-328 and the EU under contracts 215080, 289181 and 289485. The QUASAR Group is a pan-European research group based at the Cockcroft Institute in the UK. It carries out R&D into methods to decelerate and store very low energy antiproton and exotic ion beams, beam diagnostics developments for medical accelerators, including imaging and dosimetry, as well as opto-electronics and laser applications. This contribution presents the latest results of the Group's studies into the USR/ELENA/AEgIS antimatter facilities, novel least destructive beam profile monitors for medical and industry applications, as well as laser applications for accelerators, includingμaccelerators and a laser velocimeter.

Paper

Title

Other Keywords

Page

MOPEA001

Status of the Australian Synchrotron Top-Up Operations

injection, synchrotron, linac, diagnostics

58

M.J. Boland, R.T. Dowd, G. LeBlanc, D.C. McGilvery, D. Morris, Y.E. Tan, J. Trewhella, D. Zhu, E.D. van Garderen
ASCo, Clayton, Victoria, Australia

In May 2012 the Australian Synchrotron commenced Top-Up Operations for User beamtime. The facility was designed for top-up from the start with a full energy 3 GeV injection system, however top-up only became a priority once the beamline user community had established itself at the new facility in operation since April 2007. New beam diagnostic and equipment protections systems were implemented as part of the move to top-up, including a new injection efficiency monitoring system. The effect of top-up on the beamline data was also tested with each beamline prior to engaging top-up during user runs. Top-up has now been running successfully for one year and the performance statistics from this period will be presented. Top-up operations is a very popular standard mode for user beam and falling into decay mode is now treated almost as a beam dump.

MOPEA002

1.5 GeV Low Energy Mode for the Australian Synchrotron

booster, extraction, synchrotron, injection

61

R. Clarken, M.J. Boland, Y.E. Tan
ASCo, Clayton, Victoria, Australia
J.S. Hughes, K.P. Wootton
The University of Melbourne, Melbourne, Australia

The Australian Synchrotron injection system and storage ring have been retuned to 1.5 GeV for use in special operations and machine development modes. The systems were designed for 3 GeV user operations but for certain research a lower energy of 1.5 GeV is advantageous. A description of how the new low energy mode was achieved is given, including extraction on the fly from the booster synchrotron and scaling of the storage ring lattice.

MOPEA009

ESRF Operation and Upgrade Status

undulator, emittance, booster, permanent-magnet

82

J.-L. Revol, J.C. Biasci, J-F. B. Bouteille, F. Ewald, L. Farvacque, A. Franchi, G. Gautier, L. Goirand, M. Hahn, L. Hardy, J. Jacob, J.M. Koch, M.L. Langlois, G. Lebec, J.M. Mercier, T.P. Perron, E. Plouviez, P. Raimondi, K.B. Scheidt, V. Serrière
ESRF, Grenoble, France

The European Synchrotron Radiation Facility (ESRF) is presently midway through the Upgrade Programme Phase I (2009-2015), which concerns its infrastructure, beamlines and X-ray source. This paper reports on the present operation performance of the source, highlighting the more recent developments. In this context, 8 insertion device straight sections have been lengthened from five to six metres; two of them operating with canted undulators. The lattice of one cell has been modified for a further increase to 7 metres allowing the test of a mini beta optics and latter the distribution of cavities. A second cryogenic permanent magnet undulator has been completed, which gives a factor of more than 2 in flux at high energy. The booster klystron-based radio frequency transmitter has been replaced by high power solid state amplifiers. Out of three prototypes of HOM damped cavities working at room temperature which have been received and tested, one has been successfully commissioned with beam. Subsequent to the upgrade of the beam position monitor system, a new orbit feedback has substantially reduced the orbit distortion induced by ID gap motions.

MOPEA014

Temporal and Spectral Observation of Laser-induced THz Radiation at DELTA

electron, laser, radiation, simulation

94

P. Ungelenk, H. Huck, M. Huck, M. Höner, S. Khan, R. Molo, A. Schick
DELTA, Dortmund, Germany
N. Hiller, V. Judin
KIT, Karlsruhe, Germany

Funding: Work supported by the DFG, the BMBF, the Federal State NRW, the Initiative and Networking Fund of the Helmholtz Association, and the German Federal Ministry of Education and Research.
Coherent THz pulses caused by a laser-induced density modulation of the electron bunches are routinely produced and observed at DELTA, a 1.5 GeV synchrotron light source operated by the TU Dortmund University. New measurements performed with a fast hot-electron bolometer allow insight into the turn-by-turn evolution of these pulses. Furthermore, first results from a Fourier transform infrared spectrometer, which is currently under commissioning, are presented.

MOPEA015

A Transverse Electron Target for Heavy Ion Storage Rings

electron, target, ion, interaction-region

97

S. Geyer, O. Meusel, D. Ries
IAP, Frankfurt am Main, Germany
O.K. Kester
GSI, Darmstadt, Germany

A transverse electron target is a well suited concept under discussion for storage rings to investigate electron-ion interaction processes relevant for heavy ion accelerators. Using a sheet beam of free electrons in crossed beam geometry promises not only a high energy resolution but also allows access to the interaction region for photon and electron spectroscopy under large solid angles. To realize a compact and multi-purpose applicable design, only electrostatic fields are used for beam focussing. The produced electron beam has a length of 10cm in ion beam direction and a width of around 5mm in the interaction region with densities of ~10⁹electrons/cm³. The target geometry allows the independent adjustment of the electron beam current and energy in the region of several 10eV and a few keV. The setup meets the high requirements for an operation in the UHV environment of a storage ring and is installed applying the so-called animated beam technique. The electron target is dedicated to the FAIR storage rings. First measurements have been performed at a test bench. An overview of the project status will be presented including first results of the characterization measurements.

MOPEA019

Studies of Bunch-bunch Interactions in the ANKA Storage Ring with Coherent Synchrotron Radiation using an Ultra-fast Terahertz Detection System

radiation, synchrotron, wakefield, synchrotron-radiation

109

A.-S. Müller, B.M. Balzer, C.M. Caselle, N. Hiller, M. Hofherr, K.S. Ilin, V. Judin, B. Kehrer, S. Marsching, S. Naknaimueang, M.J. Nasse, J. Raasch, A. Scheuring, M. Schuh, M. Schwarz, M. Siegel, N.J. Smale, J.L. Steinmann, P. Thoma, M. Weber, S. Wuensch
KIT, Karlsruhe, Germany

Funding: Supported by Initiative and Networking Fund of the Helmholtz Association under contract No. VH-NG-320 and German Federal Ministry of Education and Research under Grant. Noss. 05K10VKC and 05K2010VKD
In the low-alpha operation mode of the ANKA synchrotron light source, coherent synchrotron radiation (CSR) is emitted from short electron bunches. Depending on the bunch current, the radiation shows bursts of high intensity. These bursts of high intensity THz radiation display a time evolution which can be observed only on long time scales with respect to the revolution period. In addition, long range wake fields can introduce a correlation between the bunches within a bunch train and thus modify the observed behavior. A novel detection system consisting of an ultra-fast superconducting THz detector and data acquisition system was used to investigate correlations visible on the bursting pattern and to study the interactions of very short pulses in the ANKA storage ring.

MOPEA020

Comparison of Different Approaches to Determine the Bursting Threshold at ANKA

radiation, synchrotron, electron, synchrotron-radiation

112

P. Schönfeldt, N. Hiller, V. Judin, A.-S. Müller, M. Schwarz, J.L. Steinmann
KIT, Karlsruhe, Germany

The synchrotron light source ANKA at the Karlsruhe Institute of Technology provides a dedicated low-α-optics. In this mode bursting of Coherent Synchrotron Radiation (CSR) is observed for bunch charges above a threshold that depends on beam parameters. This threshold can be determined by several approaches, e.g. bunch lengthening or changes in the THz radiation spectra. This paper compares different methods and their implementation at the ANKA storage ring outlining their advantages, disadvantages and limitations, including reliability and possibility of real time analysis.

MOPEA025

Closed Orbit Correction in the High Field Lattice of ILSF Storage Ring

closed-orbit, lattice, dipole, sextupole

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.

MOPEA043

Transverse Instabilities of Two Twisted Beams in a Storage Ring

ion, electron, simulation, kicker

172

B.C. Jiang, M.Z. Zhang, Z.T. Zhao
SINAP, Shanghai, People's Republic of China
G.X. Xia
UMAN, Manchester, United Kingdom

Two twisted beams (two beams run on the different closed orbit) in a storage ring which is produced by fast kickers can potentially deliver two bunds of radiations through one insertion device or one bend magnet, in this way doubles the beam line stations. This operation mode needs higher beam current and more RF buckets to be filled to keep the brightness comparable to the single beam operation mode. The resistive wall instability and ion trapping effects is analysed to address the higher current operation possibility. The analyze results show that twisted beams can weaken those two instabilities.

MOPEA045

Performance Optimization and Upgrade of the SSRF Storage Ring

emittance, optics, injection, cavity

178

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

The SSRF storage ring achieved its design performance goal in 2008, in the following years its performance was optimized and improved, including implementing top-up operation and low emittance lattice configuration as well as other attempts like fast orbit feedback and low alpha mode. In order to meet the requirements of accommodating more beamlines and high demanding performance in its phase-II beamline project, the SSRF storage ring is being upgraded with a design based on superbend based lattice and a third harmonic RF cavity system. This paper presents the main optimization works and the upgrade design considerations on the SSRF storage ring performance.

MOPEA046

Solaris Project Progress

linac, vacuum, injection, klystron

181

A.I. Wawrzyniak, C.J. Bocchetta, P.B. Borowiec, D. Einfeld, P.P. Goryl, M. Młynarczyk, R. Nietubyć, M.P. Nowak, W. Soroka, M.J. Stankiewicz, P. Szostak, P.S. Tracz, Ł. Walczak, K. Wawrzyniak, J.J. Wiechecki, M. Zając, L. Żytniak
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
Solaris is a 3rd generation light source facility being built in Kraków, Poland at the Jagiellonian University Campus. The project is being accomplished in a tight collaboration with the MAX IV Laboratory in Lund, Sweden. The Solaris 1.5 GeV storage ring is a replica of the MAX IV 1.5 GeV machine, whereas the injector and the transfer line although based on the same components, are unique for Solaris. One of the main differences is the 600 MeV injection energy requiring an energy ramp in the storage ring to the final operating energy of 1.5 GeV. The construction of the facility started in early 2010 and is planned to be finished in the autumn 2014. Up to now, 70% of the components have been procured and construction of the buildings in progress with expected handover in autumn 2013. This paper will give an update on infrastructure progress and design choices for shielding, service area placement of racks and routing of piping and cables. An update is also presented of machine layout that includes the injector, transfer line and storage ring.

MOPEA049

The First Experience of PLS-II Operation

injection, linac, lattice, insertion

190

S.H. Nam, M.-H. Cho, J.Y. Huang, C.D. Park, S. Shin
PAL, Pohang, Kyungbuk, Republic of Korea

Funding: Mministry of Education, Science and Technology (MEST) of Korea
One of recent major activities of the Pohang Accelerator Laboratory (PAL) in Korea has been PLS-II user operation. The PLS-II is a Korea’s only and brand new 3rd generation synchrotron radiation source that was upgraded from the 16-year-old PLS in 2011. The old PLS started user service from 1995 and shutdown on Dec. 10, 2010. The PLS-II has been open to users from March 2012 with upgraded performance. The performance parameters of the PLS-II are 5.8 nm-rad emittance, 3.0GeV beam energy, and 400mA beam current with the top-up injection. The unique feature of PLS-II will be the implementation of 20 insertion-devices in a compact double-bend-achromat storage ring of 280m-long circumference. Among 20 insertion-devices, 14 are in-vacuum undulators. The first year operation in 2012 will be successfully completed and the operational statistics will be summarized and discussed.

MOPEA055

First Year Operation of the ALBA Synchrotron Light Source

vacuum, interlocks, kicker, feedback

202

F. Pérez
CELLS-ALBA Synchrotron, Cerdanyola del Vallès, Spain

ALBA is a 3 GeV, 3rd generation, light source located in Cerdanyola, Barcelona, Spain, which started users operation in May 2012. In this paper we will report about the transition from commissioning to operation, the main problems faced during this first year, the actual status of the accelerators and we will provide an outlook to the next steps.

MOPEA056

Measuring and Improving the Momentum Acceptance and Horizontal Acceptance at MAX III

cavity, lattice, electron, vacuum

205

A. Hansson, Å. Andersson, J. Breunlin, G. Skripka, E.J. Wallén
MAX-lab, Lund, Sweden

Lifetime measurements for varying horizontal scraper positions performed at different RF frequencies suggested a horizontal aperture restriction in the MAX III synchrotron light source. A combination of local orbit distortions and horizontal scraper measurements pinpointed the location of the horizontal aperture restriction to the center of the main cavity straight section. The aperture restriction was determined to be located 10.4 ± 0.3 mm from the beam center. The precise result was achieved by measurements and calculations of the Touschek lifetime as a function of the main cavity voltage. Realignment of the main cavity increased the average lattice momentum acceptance from 0.0116 ± 0.0003 to 0.0158 ± 0.0003 and the horizontal acceptance from 26 ± 2 × 10^-6 m to larger than 44 ± 2 × 10^-6 m. The increase in momentum acceptance increased the lifetime in MAX III by a factor of two.

MOPEA062

Metrology of the NESTOR Facility Equipment

target, dipole, quadrupole, survey

222

O. Bezditko, V.E. Ivashchenko, I.M. Karnaukhov, A. Mytsykov, A.V. Reuzayev, A.Y. Zelinsky
NSC/KIPT, Kharkov, Ukraine

Development of X-ray generator NESTOR in the National Science Center Kharkov Institute of Physics&Technology will let significantly extend the scientific program of investigations that are carried out in NSC KIPT, will allow to increase an amount and improve quality of experimental researches in the field of physics and chemistry In this work tolerances for accuracy installation of the lattice elements of the complex are defined. The methods of lattice element position measurement were detected and ways of their realization were defined. These allow to realize the project parameters of NESTOR facility and, first of all, generated X-ray beam intensity.

MOPEA063

The First Results of the NESTOR Commissioning

injection, dipole, electron, focusing

225

A.Y. Zelinsky, V.P. Androsov, O. Bezditko, V.N. Boriskin, P. Gladkikh, A.N. Gordienko, V.A. Grevtsev, A. Gvozd, V.E. Ivashchenko, A.A. Kalamayko, I.I. Karnaukhov, I.M. Karnaukhov, D. Korzhov, V.P. Kozin, V.A. Kushnir, V.P. Lyashchenko, M.P. Maksim, V.S. Margin, N.I. Mocheshnikov, V.V. Mytrochenko, A. Mytsykov, F.A. Peev, O.V. Ryezayev, V.P. Sergienko, A.A. Shcherbakov, S. Sheyko, V.L. Skirda, Y.N. Telegin, V.I. Trotsenko, O.P. Zolochevskij, O.D. Zvonarjova
NSC/KIPT, Kharkov, Ukraine

In the paper the first results of the NESTOR facility are presented. 60 MeV electron linac injector has been tested and the first electron beam with project parameters was registered at the screen monitors. Electron beam was passed through the transportation channel and injection system. As a result, the first turn of the storage ring was closed.

MOPEA069

Tuning of the Injector System to Match Possible Lattice Upgrades at Diamond Light Source

linac, booster, lattice, injection

243

C. Christou, R. Bartolini, J. Kay
Diamond, Oxfordshire, United Kingdom
R. Bartolini
JAI, Oxford, United Kingdom

Studies of novel lattice upgrades for Diamond Light Source to achieve an increase in the number of insertion devices and/or a lower natural emittance are underway (as reported elsewhere at this conference). Such upgrades if carried out progressively would result in successive reductions in storage ring circumference. To maintain synchronous injection then requires the injector system to operate at various frequencies to match these changes. This paper describes the tests carried out with beam, to prove that the injector system of Linac and full energy Booster can be tuned over an extended frequency range.

MOPEA071

Operating the Diamond Storage Ring with Reduced Vertical Emittance

feedback, emittance, coupling, target

249

I.P.S. Martin, M.G. Abbott, M. Apollonio, R. Bartolini, D. Hickin
Diamond, Oxfordshire, United Kingdom
R. Bartolini
JAI, Oxford, United Kingdom

In a synchrotron radiation light source, a reduction in vertical emittance can potentially increase the source brightness, reduce the spot size for microfocus beam lines or increase the vertical transverse coherence of the photon beam. With this aim, the target vertical emittance for the Diamond storage ring has been recently reduced from 27pm.rad to 8pm.rad (0.3% coupling). In this paper we discuss the main impacts of this reduction, along with the steps that have been taken to stabilise the coupling at the new value.

MOPEA077

Accelerator Physics and Light Source Research Program at Duke University

FEL, wiggler, electron, feedback

264

Y.K. Wu
FEL/Duke University, Durham, North Carolina, USA

Funding: This work is supported in part by the US DOE grant no. DE-FG02-97ER41033.
he accelerator physics and light source research program at Duke Free-Electron Laser Laboratory (DFELL), TUNL, is focused on the development of the storage ring based free-electron lasers (FELs), and a state-of-the-art Compton gamma-ray source, the High Intensity Gamma-ray Source (HIGS). Driven by the storage ring FEL, the HIGS is world's most intense Compton gamma-ray source with a maximum total flux of few 10¹⁰ gamma per second (around 10 MeV). Operated in the energy range from 1 to 100 MeV, the HIGS is a premier nuclear physics research facility in the world. In 2012, we completed a major accelerator upgrade project with a wiggler switchyard system which allows the configuration changes between planar and helical FEL wigglers, and a great enhancement of the FEL gain when operated with 3 or 4 helical wigglers. In this paper, we will describe our ongoing light source development to produce gamma-ray beams in the new energy range of 100 and 158 MeV. We will also provide a summary of our accelerator physics research activities in the area of nonlinear dynamics, beam instability research, and FEL research.

MOPEA078

Commissioning and Operation of Wiggler Switchyard System for Duke FEL and HIGS

wiggler, FEL, vacuum, lattice

267

Y.K. Wu, M.D. Busch, M. Emamian, J.F. Faircloth, H. Hao, J.Y. Li, S.F. Mikhailov, V. Popov, G. Swift, P.W. Wallace, P. Wang, J. Yan
FEL/Duke University, Durham, North Carolina, USA
A.L. Wu
USTC/NSRL, Hefei, Anhui, People's Republic of China

Funding: This work is supported in part by the US DOE grant no. DE-FG02-97ER41033.
To enable the Duke storage ring FEL to operate in VUV with adequate gain, a major storage ring upgrade was carried out in 2012 to install two additional helical FEL wigglers with a wiggler switchyard system. Using the switchyard, a quick changeover can be made between two planar OK-4 wigglers and two helical OK-5 wigglers in the middle of the FEL straight section. This system preserves the linear polarization capabilities of the Duke FEL and gamma-ray beams at the High Intensity Gamma-ray Source (HIGS), while enabling VUV FEL operation with a higher gain using a longer FEL with as many as four helical wigglers. The wiggler switchyard upgrade was completed in Summer 2012, followed by a rapid and successful commissioning of the Duke storage ring, FEL system, and HIGS. In this paper, we will present the results of accelerator and light source commissioning with the wiggler switchyard. We will also present preliminary results of operating the OK-5 FEL in different configurations. With the wiggler switchyard, we are well positioned to realize the operation of a VUV FEL below 190 nm and production of Compton gamma-ray beams above 100 MeV in circular polarization.

MOPEA080

Status of the NSLS-II Injector

booster, linac, injection, kicker

273

T.V. Shaftan, A. Blednykh, E.B. Blum, W.X. Cheng, J. Choi, L.R. Dalesio, M.A. Davidsaver, J.H. De Long, R.P. Fliller, G. Ganetis, F. Gao, A. Goel, W. Guo, K. Ha, R. Heese, H.-C. Hseuh, M.P. Johanson, B.N. Kosciuk, S. Kowalski, S.L. Kramer, Y. Li, W. Louie, S. Ozaki, D. Padrazo, J. Rose, S. Seletskiy, S.K. Sharma, G. Shen, O. Singh, V.V. Smaluk, Y. Tian, K. Vetter, W.H. Wahl, G.M. Wang, F.J. Willeke, X. Yang, L.-H. Yu, P. Zuhoski
BNL, Upton, Long Island, New York, USA

We discuss the current status and plans for developing the NSLS-II injector. The latter consists of a 200 MeV linac, a 3-GeV booster, transport lines and the storage ring injection straight section. The system design and installation are complete. Last year we concluded 200-MeV linac commissioning and are planning to commission the 3 GeV booster during summer of 2013.

MOPME014

Electro-optical Bunch Length Measurements at the ANKA Storage Ring

laser, electron, wakefield, background

500

N. Hiller, A. Borysenko, E. Hertle, E. Huttel, V. Judin, B. Kehrer, S. Marsching, A.-S. Müller, M.J. Nasse, A. Plech, M. Schuh, S.N. Smale
KIT, Karlsruhe, Germany
P. Peier, V. Schlott
PSI, Villigen PSI, Switzerland
B. Steffen
DESY, Hamburg, Germany

Funding: Supported by the Initiative and Networking Fund of the Helmholtz Association under contract number VH-NG-320 and by the German Federal Ministry of Education and Research under contract number 05K10VKC
A setup for near-field electro-optical bunch length measurements has recently been installed into the UHV system of the ANKA storage ring. For electro-optical bunch length measurements during ANKA's low alpha operation, a laser pulse is used to probe the field induced birefringence in an electro-optical crystal (GaP in our case). The setup allows for both electro-optical sampling (EOS, multi-shot) and spectral decoding (EOSD, single- and multi-shot) measurements. This paper presents first results and discusses challenges of this method employed for the first time at a storage ring.

MOPME015

Numerical Wakefield Calculations for Electro-optical Measurements

simulation, wakefield, laser, impedance

503

B. Kehrer, A. Borysenko, E. Hertle, N. Hiller, V. Judin, S. Marsching, A.-S. Müller, M.J. Nasse, M. Schuh
KIT, Karlsruhe, Germany

Funding: This project is funded by the Federal Ministry of Education and Research under the contract number 05K10VKC
The technique of electro-optical measurements allows precise and single-shot measurements of the bunch length and shape. The installation of such a near-field setup changes the impedance of the storage ring and the corresponding effects have to be studied carefully. One possibility is to use numerical codes for simulating the wakefields induced by the setup. Such simulations has been done using the wakefield solver implemented in the CST Studio Suite. In this paper we present the simulation results together with first measurements.

MOPME041

Design and Calculation of the Stripline Beam Position Monitor for HLS II Storage Ring

quadrupole, coupling, simulation, impedance

562

F.F. Wu, C. Cheng, W.B. Li, P. Lu, T.J. Ma, B.G. Sun, H. Xu, Y.L. Yang, Z.R. Zhou
USTC/NSRL, Hefei, Anhui, People's Republic of China

Funding: Supported by the National Science Foundation of China (10875117, 11005105, 11175173)
According to the requirements of HLS II upgraded, in order to acquire the non-intercepting measurement of beam position and quadrupole component, a new stripline beam position monitor (BPM) was designed for storage ring. The BPM parameters were optimized to acquire impedence matching with characteristic impedance of the external transmission lines and the coupling coefficients between the electrodes were calculated. According to the difference/sum and log-ratio methods, the horizontal and vertical sensitivities, mapping figures and fitting polynomials wered acquired. The results showed that sensitivities using log-ratio method were bigger than those using difference/sum method. The sum signal was also simulated when beam displacement varied from (0 mm, 0 mm) to (5 mm, 5 mm), the result showed that the variation of normalized sum signal was no more than ±6%. The gaussian weighted method of a two-dimensional grid structure was used to simulate the gaussian bunch and simulate the beam transverse quadrupole component changing with position (x, y), the result showed that the beam transverse quadrupole component changed linearly with position combination (x2-y2).

MOPME042

A PRELIMINARY SIMULATION OF BPM SIGNAL DIODE DETECTOR FOR HLS II TUNE MEASUREMENT SYSTEM*

simulation, betatron, pick-up, synchrotron

565

J.J. Zheng, P. Lu, T.J. Ma, B.G. Sun, Y.L. Yang, J.Y. Zou
USTC/NSRL, Hefei, Anhui, People's Republic of China

Funding: Supported by National Natural Science Foundation of China (11105141, 11175173) and the Fundamental Research Funds for the Central Universities (WK2310000015)
A high sensitivity BPM signal detection front-end electronics has been designed for HLS II tune measurement system according to the HLS II upgrade requirements. Classical tune measurement systems filter out just one or a few of these betatron sidebands frequency. As a consequence, most of the betatron energy is dropped and only a very small energy remains for further processing. A new method, referred to as Direct Diode Detection (3D) by LHC[1], improves the situation. In this paper, the HLS II BPM signals have been calculated out in time domain and frequency domain. Basing on the characteristics of HLS II BPM signal, a preliminary simulation is performed to test and verify the feasibility of diode detector for HLS II tune measurement system. The simulation results clearly show that the technique of diode-based circuit can be applied to HLS II tune measurement.

MOPME052

Beam Instrumentation System Optimization for Top-up Operation in SSRF

pick-up, injection, instrumentation, booster

589

Y.B. Yan, Y.B. Leng, L.Y. Yu, W.M. Zhou
SINAP, Shanghai, People's Republic of China

In order to offer higher average brightness and more stable photon beam, top-up injection mode is scheduled for daily operation in SSRF. Several critical beam parameters, such as fill pattern, average current, beam lifetime and transfer efficiency, need to be measured precisely and reliably, and few interlock logics need to be added into machine protection system with top-up mode. Hardware and software optimizations of beam instrumentation for this purpose will be introduced in this paper.

MOPME053

Point Spread Function Study of X-ray Pinhole Camera in SSRF

radiation, synchrotron, synchrotron-radiation, emittance

592

Z.C. Chen, J. Chen, G.Q. Huang, Y.B. Leng
SSRF, Shanghai, People's Republic of China

Funding: Supported by National Natural Science Foundation of China (11075198)
An X-ray Pinhole Camera that has been used to present the transverse beam size with an intuitive grasp of the distribution of the beam radiation was installed on one beam-line of the storage ring in Shanghai Synchrotron Radiation Facility (SSRF). The real beam size however is a function of the image size of the CCD camera and the point spread function (PSF) of the system. The PSF was calculated but poorly tested. This article will present the measurement of the PSF with a series of beam based experiments and the consistency with the theoretical beam size.

MOPME054

Bunch-by-bunch Beam Position and Charge Monitor based on Broadband Scope in SSRF

injection, pick-up, synchrotron, synchrotron-radiation

595

Y. Yang, Y.B. Leng, Y.B. Yan, N. Zhang
SSRF, Shanghai, People's Republic of China

A bunch-by-bunch beam position and charge monitor system, based on a broadband oscilloscope, has been developed at SSRF. The beam positions of each bunch could be located independently in this system by using the original signals from the button-type pickups on the storage ring. The relative charge of each bunch could be obtained by the sum signal from the pickups. Using sum weighted average method, turn-by-turn beam position could be got from the bunch-by-bunch beam position data. The difference of each bunch beam position have been observed during injection at SSRF.

MOPWA002

New Purposed High Precision Power Supply For Quadrupole Magnets Of ILSF using Low Resolution Digital PWM

power-supply, quadrupole, controls, feedback

664

M. Jafarzadeh, M. Akbari, J. Rahighi, D. Shirangi, E.H. Yousefi
ILSF, Tehran, Iran

A total number of 10⁴ quadrupole magnets, split into 9 families, will be required for the ISLF storage ring lattice. Each quadrupole magnet is connected with its own independent power supply. In new design for quadrupole magnets, the outputs of two synchronized push-pull converters (one for coarse regulation and another for fine current regulation) will be added together before a synchronous rectification. In this manner, there will be no need for extra high-current electronic parts. Another advantage of this design is using a high-voltage inductor on the switching side rather than a high current inductor ion the high current side. The PWM signal to control of buck converter (at the input stage of each unit) will be generated inside a dsPIC .

MOPWA013

The New Injection System of the HLS II

septum, kicker, pulsed-power, controls

687

L. Shang, Y. Lu, F. Shang, Y.Y. Wang
USTC/NSRL, Hefei, Anhui, People's Republic of China

Funding: The program is funded by NSFC with No. 10875116 and No. 11175181
The 0.8GeV storege ring is being rebuilt in NSRL. The design and construction of the new injection system of the new ring is presented. Kicker magnet, septum magnet and their pulsed power suplies are described. Test results are given. The ceramic chambers, vacuum tank of the septum magnet, system timing and local pulsed power control are also described. The installation and testing of the new system undergoing.

MOPWA045

The Pulsed Power Supply System for TPS Project

injection, kicker, power-supply, booster

771

C.-S. Fann, C.L. Chen, K.T. Hsu, S.Y. Hsu, A.P. Lee, K.-K. Lin, K.L. Tsai
NSRRC, Hsinchu, Taiwan

The pulsed power supply system for TPS project consists of three types of pulser for booster injection/extraction and storage ring injection. Categorizing by the delivered peak current, pulse shape base-width, they are for: 1) booster kicker: 500 A, square, 1 μs; 2) storage ring kicker: 5 kA, half-sine, 5 μs; 3) transfer line septum: 10 kA, half-sine, 300 μs; respectively. All together, there are 10 units constructed for the associated pulsed magnets. In this report, the test results of the pulsed power supplies will be summarized and the measured results of their performance are presented.

MOPWA048

The Cable Engineering Project for the TPS Power Supply

booster, power-supply, dipole, sextupole

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.

MOPWO058

Injection Simulations for TPS Storage Ring

injection, simulation, kicker, lattice

1022

C.C. Chiang, P.J. Chou
NSRRC, Hsinchu, Taiwan

We present injection simulations for the TPS (Taiwan Photon Source) storage ring. The baseline lattice of TPS storage ring is a 6-fold structure with 24 double bend cells. For the Step I commissioning, only baseline lattice with dummy chambers are installed. The three double mini-beta-y lattice with insertion devices will be applied during Step II commissioning. The Tracy-2 program is used to simulate the particle motion in 6-D phase space. We adopt lattice models which include errors of alignments and magnet fields. The particle loss due to scraping by chamber limit is recorded in Tracy-2 simulation. We can estimate the radiation distribution of a ring and provide a reference for the shielding design accordingly.

MOPWO061

Numerical Approaches for Simulation of Stochastic Cooling in 2D Phase Space

emittance, simulation, coupling, electromagnetic-fields

1028

M. Dolinska
NASU/INR, Kiev, Ukraine
C. Dimopoulou, A. Dolinskyy, F. Nolden
GSI, Darmstadt, Germany

A consolidated fluid-dynamics algorithm for the analysis of beam dynamics under the influence of the electromagnetic field is presented. Aiming at simulating stochastic cooling of particle beams in 2D space, two numerical algorithms solving the 2D Fokker-Planck Equation are described. As an alternative approach, a numerical method based on the macro-particle tracking turn in turn in the ring (i.e. in the time domain) is introduced. Some results of the simulation of the stochastic cooling in the Collector Ring by both methods are discussed.

MOPWO067

Beam Dynamics Simulations with a GPU-accelerated Version of Elegant

simulation, acceleration, collective-effects, controls

1040

I.V. Pogorelov, K.M. Amyx, J. Balasalle, J.R. King
Tech-X, Boulder, Colorado, USA
M. Borland, R. Soliday
ANL, Argonne, USA

Funding: Work supported by the US DOE Office of Science, Office of Basic Energy Sciences under grant number DE-SC0004585, and by Tech-X Corporation
Large scale particle tracking and tracking-based lattice optimization simulations can derive significant benefit from efficient implementation of general-purpose particle tracking on GPUs. We present the latest results of our work on accelerating Argonne National Lab's accelerator simulation code ELEGANT*,** using CUDA-enabled GPUs. A sufficiently large number of Elegant beamline elements has been ported to GPUs to allow the GPU-accelerated simulation of realistic test lattices. We will identify some of performance-limiting factors, and briefly discuss optimization techniques for efficient utilization of the device memory space, with an emphasis on register usage. We also present a novel hardware-assisted technique for efficiently calculating a histogram from a large distribution of particle coordinates, and compare this to data-parallel implementations.
* M. Borland, Elegant: A Flexible SDDS-compliant Code for Accelerator Simulation, APS LS-287, September 2000
** Y. Wang, M. Borland, in Proc. of PAC07, THPAN095 (2007)

TUXB101

Status of the FAIR Facility

ion, antiproton, target, heavy-ion

1085

O.K. Kester
GSI, Darmstadt, Germany

The unique facility for Antiproton and Ion Research – FAIR will deliver stable and rare isotope beams covering a huge range of intensities and beam energies. In addition, the beams for the experiments will have highest beam quality for a cutting edge physics program. Therefore a unique accelerator facility using cutting edge technology will be built until 2018. The challenges are heavy ion synchrotrons for highest intensities, antiproton and rare isotope production stations, high resolution separators and several storage rings where beam cooling can be applied. Here new kind of superconducting magnets, rf-systems, injection and extraction systems and beam diagnostics will be applied. As the construction of the FAIR facility and procurement has started, an overview of the designs, procurements status and infrastructure preparation will be provided.

Slides TUXB101 [9.587 MB]

TUODB102

Intrabeam Scattering Studies for Low Emittance of BAPS

emittance, wiggler, damping, lattice

1123

S.K. Tian, Y. Jiao, J.Q. Wang, G. Xu
IHEP, Beijing, People's Republic of China

In modern storage ring light sources, intra-beam scattering (IBS) is often thought of as a fundamental limitation to achieving ultra-low emittance and hence higher brightness. Beijing Advanced Photon Source (BAPS) is under design at Institute of High Energy Physics (IHEP) which aims to emittance less than 1nm at 5GeV. To improve the coherence and high brightness, low emittance- in both transverse planes at the diffraction limit for the range of x-ray wavelengths(≈10 pm)- is being pursued. Thus, due to the very low emittance, intra-beam scattering effect is an issue. Accurate estimation to check if the design goal can be reached is necessary. In this paper, we use the 6-D accelerator simulation code-elegant and Accelerator Toolbox (AT)-a collection of tools to model storage rings in the MATLAB environment. Based on a temporary design lattice of BAPS, we present the results of particle simulation study of intra-beam scattering effect versus the beam energy, the emittance coupling factor, the bunch length, the bunch current and so on. We also studied the mitigating method by adopting damping wigglers in one or more dispersion-free regions.

Slides TUODB102 [2.338 MB]

TUXB201

Short-pulse Operation of Storage Ring Light Sources

radiation, electron, photon, optics

1129

A.-S. Müller
KIT, Karlsruhe, Germany

Short-pulse operation of synchrotron light source storage rings can be useful for both the production of IR and THz-band radiation and high repetition rate pump-probe science in the X-ray regime. Different approaches to short-pulse generation include low-alpha optics configurations, two-frequency RF potential manipulation, laser-induced femtoslicing, longitudinal crab-cavity deflection and pseudo-bunch operation with a fast kicker to isolate a single bunch. This talk should review each of these techniques and discuss implications for machine operation in terms of pulse length, beam intensity, beam stability, pulse repetition rate, output radiation beam quality and potential applications.

Slides TUXB201 [12.058 MB]

TUOAB201

Ultra-Short X-ray Pulse Generation by Electron Beam Slicing in Storage Rings

electron, linac, emittance, photon

1134

L.-H. Yu, F.J. Willeke
BNL, Upton, Long Island, New York, USA

Funding: Department of Energy, USA
We propose a new method to generate ultra-short x-ray pulses using focused short low energy (5-10MeV) electron bunch to slice a short electron bunch from the electron bunches in a synchrotron radiation storage ring. When the low energy electron bunch crosses from top the high energy electron bunch at right angle, its coulomb force will kick a short slice of high energy electrons away from the core of the storage ring electron bunch. When the low energy electron bunch (about 50 pC) is focused to about 50 micron size and compressed to about 150fs bunch length and is positioned on top of the high energy electron bunch by a distance about 30 micron, the coulomb force is sufficient to give a kick vertically to the electrons within a short slice of the storage ring bunch about 200 fs long with a deflection about 4 micro-radian. This is sufficient to deflect the slice away from the core by a separation of 5 times the angular divergence of the beam. The separated slice when passing through an undulator, will radiate ulstra-short x-ray pulses at about 200 fs. We discuss the advantages and challenges of this new method. We provide data to demonstrate the feasibility of this method.

Slides TUOAB201 [1.578 MB]

TUOAB202

ILSF, A Third Generation Light Source Laboratory in Iran

synchrotron, dipole, quadrupole, cavity

1137

J. Rahighi, M.R. Khabazi
IPM, Tehran, Iran
E. Ahmadi, H. Ajam, M. Akbari, S. Amiri, A. Babaei, J. Dehghani, R. Eghbali, J. Etemad Moghadam, S. Fatehi, M. Fereidani, H. Ghasem, A. Gholampour, A. Iraji, M. Jafarzadeh, B. Kamkari, S. Kashani, P. Khodadoost, H. Khosroabadi, M. Moradi, H. Oveisi, S. Pirani, M. Rahimi, M. Razazian, A. Sadeghipanah, F. Saeidi, R. Safian, E. Salimi, Kh.S. Sarhadi, O. Seify, M.Sh. Shafiee, A. Shahveh, A. Shahverdi, D. Shirangi, E.H. Yousefi
ILSF, Tehran, Iran
D. Einfeld
CELLS-ALBA Synchrotron, Cerdanyola del Vallès, Spain

The Iranian Light Source Facility (ILSF) project is a first large scale accelerator facility which is currently under planning in Iran. The circumference of the storage ring is 297.6 m with the energy of 3 GeV. The facility will be built on a land of 100 hectares area in the city of Qazvin, located 150 km West of Tehran. The city is surrounded by many universities, research centers and industrial companies. The design and construction of prototype items such as radio frequency solid state amplifier, dipole magnets, highly stable magnet power supplies and girders have already begun. A low field H-type dipole magnet with the central field of 0.5T at the gap of 34mm and length of 500mm was built and tested in site. Also a prototype storage ring quadrupole with a 18 T/m gradient and 233 iron length is in now in fabrication process. Site selection studies, including geotechnical and seismological measurements are being performed. Conceptual Design Report, CDR, as the first milestone of the project has been published on October 2012.

Slides TUOAB202 [5.173 MB]

TUOAB203

ESRF Upgrade Phase II

lattice, emittance, vacuum, brilliance

1140

J.-L. Revol, P. Berkvens, J.C. Biasci, J-F. B. Bouteille, N. Carmignani, F. Ewald, L. Farvacque, A. Franchi, L. Goirand, M. Hahn, L. Hardy, J. Jacob, J.M. Koch, G. Lebec, S.M. Liuzzo, B. Nash, T.P. Perron, E. Plouviez, P. Raimondi, K.B. Scheidt, V. Serrière
ESRF, Grenoble, France

Four years after the launch of the Upgrade Programme, the ESRF is midway through its first phase (2009-2015) and has defined the objectives for the ensuing second phase. The first phase paved the way to a new generation of nano-beam X-ray beamlines fed by an X-ray source itself substantially improved in terms of reliability, stability and brilliance. The second phase envisions a major upgrade of the source to best serve the science case of this new generation of beamlines. In December 2012, the ESRF Council endorsed Management's proposal to launch the technical design study of a new 7-bend achromat lattice. This new configuration will allow the ESRF storage ring to operate with a decrease in horizontal emittance by a factor of about 30 and a consequent increase in brilliance and coherence of the photon beam. The increase will be substantially higher at X-ray energies larger than 50 keV.

Slides TUOAB203 [3.664 MB]

TUODB203

Dual Chip in Single Module Solid-State Power Amplifier Design for Compact Transmitter Architecture

insertion, impedance, booster, linac

1158

T.-C. Yu, L.-H. Chang, M.H. Chang, L.J. Chen, F.-T. Chung, M.-C. Lin, Y.-H. Lin, Z.L. Liu, C.H. Lo, M.H. Tsai, Ch. Wang, T.-T. Yang, M.-S. Yeh
NSRRC, Hsinchu, Taiwan

At present, the high power solid-state technique transmitter design are composed of hundreds parallel combined single chip for hundreds Watts power modules to achieve enough output power. Although the large numbers can bring high redundancy during system operation, the power hungry of next generation RF system of accelerator would need much more modules to reach its power requirement. Huge amount of power modules would bring the complexity and difficulty in power combining, system construction, management and maintenance. To overcome this problem, upgrading the power level of a single module could be the solution. Besides depending on the power level growing with technology advancement in semiconductor industry, a circuit level solution to combine dual chip in advance in a single PCB board is proposed to produce twice power as single chip. Such feasible solution can overcome the over-complexity of future several-hundreds kW solid-state transmitter design.

Slides TUODB203 [2.337 MB]

TUPEA028

Echo-enabled Harmonic Generation based on Hefei Storage Ring

FEL, electron, bunching, laser

1208

H.T. Li, W.W. Gao, Q.K. Jia, L. Wang
USTC/NSRL, Hefei, Anhui, People's Republic of China

Echo-Enabled Harmonic Generation (EEHG) has been proposed and experimently demonstrated recently. In this paper, we numerically investigate the possibility of operating EEHG based on Hefei storage ring, which has a short circumference and a small momentum compaction factor. The difference to other similar reserch is that we use the whole ring as the first dispersive section and an optical klystron as the second one.

TUPFI049

Studies of 10 GeV Decay Ring Design for the International Design Study of the Neutrino Factory

insertion, injection, kicker, optics

1457

D.J. Kelliher, C.R. Prior
STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
N. Bliss, N.A. Collomb
STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
A. Kurup, J. Pasternak
Imperial College of Science and Technology, Department of Physics, London, United Kingdom
J. Pasternak
STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
H. Witte
BNL, Upton, Long Island, New York, USA

Due to the discovery of large θ13 the final muon storage energy in the baseline solution of International Design Study for the Neutrino Factory (IDS-NF) has been set at 10 GeV. A new racetrack design has been produced for the decay ring to meet this requirement. The details of lattice design and the beam dynamics calculations are discussed. The feasibility of the injection system for both positive and negative muons into the ring is explored in details.

TUPFI055

Stochastic Injection Scenarios and Performance for NuSTORM

injection, target, proton, simulation

1469

D.V. Neuffer
Fermilab, Batavia, USA
A. Liu
Indiana University, Bloomington, Indiana, USA

At Fermilab, we are developing NuSTORM (Neutrinos from STORed Muons), a neutrino beam from muon decay in a long straight section of a storage ring. The baseline design for NuSTORM uses what was called “stochastic injection”. In that method, high-energy protons on a nuclear target produce pions that are directed by a chicane into a straight section of the storage ring. Pions that decay within that straight section can provide lower-energy muons that are within the circulating acceptance of the storage ring. This decay acceptance enables injection for multiple storage ring turns without kickers, and muon accumulation can be reasonably high. The design of a muon storage ring with pion injection is described and simulations of acceptance are discussed. Alternative injection approaches are also discussed.

TUPFI061

Preliminary Design of a Higgs Factory μ+μ- Storage Ring

quadrupole, dipole, collider, factory

1487

A.V. Zlobin, Y.I. Alexahin, V.V. Kapin, V.V. Kashikhin, N.V. Mokhov, I.S. Tropin
Fermilab, Batavia, USA

Funding: Work supported by Fermi Research Alliance, LLC, under contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, and by the US Department of Energy through the Muon Accelerator Program (MAP).
A Muon Collider offers unique possibilities for studying the recently found Higgs boson. Higgs bosons can be produced in reasonable amounts in the s-channel, so that the colliding muon beam energy of just 62.5GeV is required. Precision direct measurements of the Higgs boson mass and width is possible due to absence of brems- and beam-strahlung. At the same time, there are difficulties specific to muon colliders: relatively large beam emittance which necessitates quite small beta-function values (~ a few cm) at the interaction point in order to obtain sufficiently high luminosity, as well as superconducting magnet and detector protection from showers generated by muon decay products. Due to these factors, the required aperture of the final focus quadrupoles is very large (up to 0.5 m) posing challenging engineering constraints as well as beam dynamics issues with fringe fields. The first results of a complex approach to these problems in the Higgs Factory collider design are presented which promise luminosities in excess of 1031 cm^-2s⁻¹ with a 4 MW proton driver.

TUPME005

Preparations for Beam Tests of a CLIC Damping Wiggler Prototype at ANKA

wiggler, damping, emittance, target

1568

A. Bernhard, E. Huttel, P. Peiffer
KIT, Karlsruhe, Germany
A.V. Bragin, N.A. Mezentsev, V.M. Syrovatin, K. Zolotarev
BINP SB RAS, Novosibirsk, Russia
P. Ferracin, D. Schoerling
CERN, Geneva, Switzerland

The Compact Linear Collider (CLIC) will require ultra-low emittance electron and positron beams. The targeted emittance will be achieved by radiative damping in the CLIC damping rings. For an efficient damping high-field short-period superconducting damping wigglers will be employed. In the conceptual design phase of CLIC, the basic layout of these wigglers has been elaborated at CERN. In the course of the CLIC technical feasibility studies a full-scale damping wiggler prototype will be installed and tested in the ANKA storage ring. The device is currently under design and construction at the Budker Institute of Nuclear Physics, Russia. Above the magnetic requirements, the main design challenges for the prototype are scalability –- particularly of the cooling concept –-, modularity and the capability of sustaining a high radiative heat load. The experiments at ANKA aim at a validation of the technical concepts applied to meet these requirements. Beyond that an extended experimental program on beam dynamics and alternative technical solutions is envisaged. This contribution gives an overview over the current status of the project and the further planning.

TUPME025

Calculation of the Equilibrium Parameters for the Compact Ring of TTX

emittance, photon, scattering, electron

1625

H.S. Xu, W.-H. Huang, C.-X. Tang
TUB, Beijing, People's Republic of China
S.-Y. Lee
IUCEEM, Bloomington, Indiana, USA

Intra-Beam Scattering (IBS) can cause emittance growth in high intensity low energy beams. We study its effect on the compact low energy electron storage ring, proposed for Tsinghua Thomson Scattering X-ray source (TTX). For a single bunch with peak current at about 17A and re-entrant type normal conducting RF cavity with peak voltage at 15kV, the equilibrium horizontal and vertical emittances are 2.9 and 0.3 μm, and the rms momentum spread and bunch length are about 0.2%, and 23ps. In this paper, we report the methods and results of the IBS calculation.

TUPME053

General Beam Loading Compensation in a Traveling Wave Structure

beam-loading, bunching, linac, electron

1688

H. Shaker, S. Döbert
CERN, Geneva, Switzerland
H. Shaker
IPM, Tehran, Iran

The well-known beam loading in a traveling wave structure is in fact a resistive beam loading which bunches travel on the crest. This type of beam loading could be compensated by increasing RF feed power. But generally, bunches could travel on each phase. General beam loading compensation is well-known for a single cell cavity and it is done by changing the RF feed power and detuning the structure together. In this paper, the concept of detuning for a TW structure will be shown and the evolution of fundamental mode beam-induced field will be derived and finally, it will be shown how to compensate beam loading by changing the phase velocity in comparison to the beam velocity.

TUPWA003

Beam Based Magnet Alignment for Emittance Coupling Minimization

sextupole, quadrupole, emittance, 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.

TUPWA015

The Study of Bunch Lengthening in Electron Storage Ring

impedance, synchrotron, luminosity, electron

1757

Y. Li, L. Wang, Y. Zhang
IHEP, Beijing, People's Republic of China

The bunch length of electron storage ring of BEPCII was measured repeatedly during steady synchronous mode and streak camera was calibrated well. From the bench lengthening , the coupling impedance of the whole ring was estimated, which was according with theoretic impedance budget . Meanwhile, the small ap optics for improving the luminosity was feasible in collision mode form synchronous result .

TUPWA030

Impedances Calculations of Bellows in HLS II Storage Ring

impedance, wakefield, shielding, coupling

1784

Q. Zhang, W. Li, L. Wang
USTC/NSRL, Hefei, Anhui, People's Republic of China

The upgrade project of Hefei Lighe Source storage ring is carrying on.In this project,a new Bellows, in which shielding is provided by sprung fingers which can slide along the beam screen,is installed at the accelerator interaction area In order to reduce this impedance to an acceptable value. The contributions of Bellows to short range wakefields and broadband impedance were calculated numerically by Mafia code .

TUPWA038

Equilibrium Bunch Density Distribution with Passive Harmonic Cavities in the MAX IV 3 GeV Storage Ring

cavity, impedance, emittance, damping

1790

P.F. Tavares, Å. Andersson, A. Hansson
MAX-lab, Lund, Sweden

The MAX IV storage rings will use third harmonic cavities operated passively to lengthen the bunches and alleviate collective instabilities. These cavities are an essential ingredient in the MAX IV design concept and are required for achieving the final design goals in terms of stored current, beam emittance and beam lifetime. This paper reports on fully self-consistent calculations of the longitudinal bunch density distribution in the MAX IV 3 GeV storage ring, which indicate that up to a factor 5 increase in RMS bunch length is achievable with a purely passive system.

TUPWA052

Loss Factor and Impedance Analysis for the Diamond Storage Ring

impedance, vacuum, wiggler, simulation

1826

R. Bartolini, R.T. Fielder, C.A. Thomas
Diamond, Oxfordshire, United Kingdom

Diamond Light Source is investigating the possibility of increasing the storage ring operating current above the nominal 300 mA. A campaign of measurements and simulations has been carried out in order to understand the extent of the parasitic energy loss and characterise the most important items which build up the machine impedance. In this paper we report on the most recent measurements of the longitudinal loss factor and the present status of the impedance database with an initial comparison between the two.

TUPWO031

Double-mini-beta Optics for the SSRF Storage Ring

optics, dynamic-aperture, emittance, injection

1943

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

The two long straight sections of the SSRF storage ring will be installed by dual canted in-vacuum insertion devices in the near future. In order to get high brightness and maintain good machine performance, the vertical beta function must be reduced by a triplet of quadrupole between the two source points, which is the so-called double-mini-beta optics. We have designed this kind of optics for SSRF, and the results are presented in this paper.

TUPWO040

Asymmetric Energy Colliding Ion Beams in the EDM Storage Ring

ion, proton, dipole, controls

1961

I. Koop
BINP SB RAS, Novosibirsk, Russia

A possibility to bent equally two counter rotating ion beams by the crossed electric and magnetic fields is investigated. The first beam is polarized and its spin precession is adjusted to be synchronous with the velocity vector precession (a frozen spin method). The counter rotating unpolarized ion beam travels along the same orbit but with different velocity. Sensitive SQUID-type BPMs measure the vertical orbit difference of two beams. Later on this information is used to distinguish the EDM signal from the magnetic moment precession. Application of this approach to search of the EDM for proton, deuteron and helion is discussed.

TUPWO042

Modeling Results from Magnetic and Beam Based Measurements of the ALBA Gradient Dipoles

dipole, focusing, lattice, quadrupole

1967

X. Gavaldà
SOLEIL, Gif-sur-Yvette, France
G. Benedetti, J. Marcos, Z. Martí
CELLS-ALBA Synchrotron, Cerdanyola del Vallès, Spain

The ALBA lattice is a DBA-like structure where most of vertical focusing is provided by gradient dipoles. In the first year of machine operation, the model parameters describing the focusing strength of the 32 dipoles have been calibrated by fitting the measured closed orbit response matrix. The mean k-value obtained from this analysis differs by -0.3% with respect to the value taken from the magnetic measurements previous to the magnet installation, while the k variation within the 32 dipoles is of the same order of magnitude. The optics results (tunes, beta beating, dispersion) obtained with the beam based model are compared with the predicted ones from the magnetic measurement model.

TUPWO063

Reducing HLS-II Emittance by Radiation Damping Partition Factor Exchange

wiggler, emittance, damping, lattice

2009

J.Y. Li
FEL/Duke University, Durham, North Carolina, USA
W. Li, G. Liu, W. Xu
USTC/NSRL, Hefei, Anhui, People's Republic of China
Y. Li
BNL, Upton, Long Island, New York, USA

Funding: The Introduction of Outstanding Technological Talents Program of Chinese Academy of Sciences, 2010.
In this paper, we present a preliminary study on using a Robinson wiggler, a wiggler with transverse gradient, to reduce the horizontal beam emittance of the Hefei Light Source II (HLS-II) storage ring. A proof-of-principle study demonstrates that it is possible to further reduce the horizontal beam emittance by 50\% using a 2-meter long Robinson wiggler installed on a dispersive straight section. This encouraging result suggests a feasible option to significantly improve the HLS-II performance at a relative low cost and without significant modification to its global configuration in the near future.

WEOBB202

Ultra-fast Data Acquisition System for Coherent Synchrotron Radiation Based on Superconducting Terahertz Detectors

synchrotron, radiation, electron, controls

2094

C.M. Caselle, M. Hofherr, K.S. Ilin, V. Judin, A. Kopmann, A. Menshikov, A.-S. Müller, M. Siegel, N.J. Smale, P. Thoma, M. Weber, S. Wuensch
KIT, Eggenstein-Leopoldshafen, Germany
B.M. Balzer, S. Cilingaryan
Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany

The ANKA synchrotron radiation source located at the Karlsruhe Institute of Technology in Germany operates in the energy range between 0.5-2.5GeV and provides coherent synchrotron radiation. To resolve the ultra-short terahertz pulses emitted by a single bunch, thin YBCO superconducting film detectors have been developed. A response time of 45ps was determined as the FWHM at the output of the analog amplifier. A novel and high accuracy data acquisition architecture for sampling of the individual ultra-short terahertz pulses combined with real-time data processing based on GPUs for coherent synchrotron radiation is presented. The digitizer board is a made-in-house board designed for sampling of the fast pulse signals with pulse width between few tens of picosecond until 100ps. For each terahertz pulse five samples are acquired with a minimum sampling time of 3ps. A prototype setup with terahertz YBCO detectors, digitizer boards and the high-throughput FPGA framework has been successfully developed and tested at ANKA. The overview of the experimental setup including the YBCO detector technology and the preliminary results with single and multi-bunch filling pattern will be discussed.

Slides WEOBB202 [2.416 MB]

WEIB204

Industry and Science, POSCO and POSTECH Case

linac, site, FEL, klystron

2115

W. Namkung
PAL, Pohang, Kyungbuk, Republic of Korea

Funding: * Supported by MEST and POSTECH
POSCO is a world-leading iron and steel company established in 1968 in Pohang, in the South East coast of Korea. Starting with 1.0 million ton size in 1973, the company made profits even in the first year. While its capacity has been increased to 40 million tons with another works in Gwangyang, POSCO paid attention on education to attract intellectuals to Pohang and Korea. It results in establishing a small-sized university, Pohang University of Science and Technology (POSTECH) in 1987. POSTECH immediately decided to construct a third generation synchrotron light source of 2.0 GeV, Pohang Light Source (PLS) on its campus in 1988, with support from POSCO and also Government. POSTECH achieved a high rank in the world, and PLS is upgraded to 3.0 GeV in 2011. A new PAL-XFEL of 10.0 GeV is now under construction. POSCO's consistent policy is the key of the success of POSTECH and Pohang Light Source. This is an unprecedented example of the relationship between industry and science.

Slides WEIB204 [4.759 MB]

WEPWA012

Preliminary Design of Transfer Lines for the ILSF Accelerator Complex

booster, linac, synchrotron, electron

2153

H. Ghasem
IPM, Tehran, Iran
E. Ahmadi, F. Saeidi
ILSF, Tehran, Iran

There are two transfer lines (T-lines) which link the Iranian Light Source Facility (ILSF) accelerator complex to gather. Several criterias have been considered in design stage of the T-lines. This paper gives linear optimization results of the designed T-lines based on the first layout of the ILSF.

WEPWA013

Injection Scheme into the High Field ILSF Storage Ring

kicker, electron, injection, booster

2156

H. Ghasem
IPM, Tehran, Iran
E. Ahmadi, F. Saeidi
ILSF, Tehran, Iran

The injection system into a storage ring of a synchrotron radiation facility significantly affects quality of the electron beam and the radiated x-ray. The extracted 3 GeV electron beam from the booster synchrotron of the ILSF is transferred via the BTS transfer line and injected into the ILSF storage ring based on high field lattice structure. This paper describes the injection procedure into the ILSF storage ring and gives the electron tracking results of the injected beam.

WEPWA016

Production of Intense High Energy Gamma Beam for LEPS2 Project at SPring-8

laser, injection, electron, scattering

2162

T. Yorita, T. Hotta, N. Muramatsu, T. Nakano, M. Oka, M. Yosoi
RCNP, Osaka, Japan
S. Daté, Y. Ohashi, H. Ohkuma, M. Oishi, Y. Okayasu, M. Shoji, S. Suzuki, Y. Taniuchi
JASRI/SPring-8, Hyogo-ken, Japan

Construction of new beam line for LEPS2 Project at SPring-8 has been done and development is now undergoing. LEPS2 is the project for high energy hadron physics using intense high energy gamma beam as probe. The gamma beam is produced by laser backward Compton scattering with injecting high power UV laser into the 8 GeV electron beam on long straight section of SPring-8 storage ring. The target intensities are ~10⁷/s for E_γ=2.4 GeV, ~10⁶/s for E_γ=2.9 GeV.

WEPWA018

Pulsed Sextupole Injection for BAPS

injection, sextupole, emittance, septum

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.

WEPWA020

Laser Electron Storage Ring for TTX

cavity, laser, electron, quadrupole

2171

H.S. Xu, W.-H. Huang, C.-X. Tang, L.X. Yan, Y. You
TUB, Beijing, People's Republic of China
D. Jehanno, Z.F. Zomer
LAL, Orsay, France
S.-Y. Lee
IUCEEM, Bloomington, Indiana, USA

Tsinghua Thomson scattering X-ray (TTX) source, proposed by Tsinghua University, is a hard x-ray source with multi-application in condensed matter physics, etc. The TTX is composed of an S-band photocathode RF gun and a SLAC type 3m travelling wave Linac, and a femto-second tera-watt laser system drives the photocathode. The TTX source is in operation. To extend the capability of TTX, we plan to design a ring based system to increase the photon flux. In this paper, we report the design of the compact electron storage ring and optical cavity, expected performance, and future prospects.

WEPWA035

Design of a Superconducting Undulator Magnet Prototype for SSRF

undulator, superconductivity, synchrotron, electron

2205

Z.C. Zhang, J. Cui, J.Y. Jiang, M. Li, W. Li, J.P. Xu, J.J. Xu, J.F. Yu
SINAP, Shanghai, People's Republic of China

Funding: Project 11275254 supported by National Natural Science Foundation of China.
A 0.65 T NbTi superconducting undulator magnet prototype with a period length of 16 mm and a period number of 5 for SSRF is designed. The magnetic field simulation shows that it is possible to obtain a peak field of 0.6 T on the beam axis at a magnetic gap of 9 mm, with a current density of 800A/mm2 in the superconducting coils. Two coil formers are machined from SAE10¹⁸ stainless steel and coated with TiO2 for insulation. The dimension of the grooves of the coil windings in the coil formers is 5 mm x 10 mm. Formvar insulated NbTi superconducting wires with a diameter of 0.6 mm are used for the 128 turn coils per core groove. A five periods core of NbTi superconducting magnet is machined from SAE1018 stainless steel and winded with copper wires.

WEPWA049

Top-up Safety Simulations for the ALBA Storage Ring

dipole, quadrupole, sextupole, simulation

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.

WEPWA060

The Kharkov X-ray Generator Facility NESTOR

electron, lattice, controls, injection

2253

A.A. Shcherbakov, V.P. Androsov, N. Ayzatsky, V.N. Boriskin, E.V. Bulyak, A.N. Dovbnya, P. Gladkikh, A.N. Gordienko, V.A. Grevtsev, A. Gvozd, V.E. Ivashchenko, A.A. Kalamayko, I.I. Karnaukhov, I.M. Karnaukhov, V.P. Kozin, V.A. Kushnir, V.P. Lyashchenko, V.S. Margin, N.I. Mocheshnikov, V.V. Mytrochenko, A. Mytsykov, I.M. Neklyudov, T.F. Nikitina, F.A. Peev, O.V. Ryezayev, V.L. Skirda, V.A. Skomorokhov, Y.N. Telegin, V.I. Trotsenko, A.Y. Zelinsky, O.D. Zvonarjova
NSC/KIPT, Kharkov, Ukraine
J.I.M. Botman
TUE, Eindhoven, The Netherlands
I.V. Drebot
LAL, Orsay, France

The last few years the sources of the X-rays NESTOR based on a storage ring with low beam energy and Compton scattering of intense laser beam are under design and development in NSC KIPT. The main task of the project is to develop compact intense X-ray generator on the base of relatively cheap accelerator equipment and up-to-date laser technologies. The paper is devoted to description of the last results on construction and commissioning of the facility.

WEPWA075

High-gain X-ray FELs using a Transverse Gradient Undulator in an Ultimate Storage Ring

FEL, undulator, emittance, electron

2286

Y.T. Ding, P. Baxevanis, Y. Cai, Z. Huang, R.D. Ruth
SLAC, Menlo Park, California, USA

An “ultimate” storage ring based on PEP tunnel has been designed to achieve diffraction limited emittance (at 1.5 Angstrom)[*]. With sufficient peak current, the beam brightness of such an “ultimate” storage ring may be sufficient to drive a short-wavelength, high-gain FEL. However, the large energy spread intrinsic to storage rings hinders the FEL applications for x-ray wavelengths. To overcome this problem, we adopt the transverse-gradient undulator concept[**][***] to study a high-gain FEL in an ultimate storage ring. Using PEP-X as an example, we showed from simulations that a high-gain FEL at the photon energy 1keV with a peak power of a few hundred megawatts can be achieved within a saturation length of 100 meters.
* Y. Cai et al., Phys. Rev. ST Accel. Beams 15, 054002 (2012).
** T. Smith et al., J. Appl. Phys. 50, 4580 (1979)
*** Z. Huang, Y. Ding and C. B. Schroeder, Phys. Rev. Lett 109, 204801 (2012).

WEPWO041

Beam Commissioning Superconducting RF Cavities for PLS-II Upgrade

SRF, cavity, vacuum, LLRF

2390

Y.U. Sohn, M.-H. Chun, J.Y. Huang, Y.D. Joo, S.H. Nam, C.D. Park, H.J. Park, I.S. Park, I.H. Yu
PAL, Pohang, Kyungbuk, Republic of Korea

Two superconducting RF cavities were commissioned with electron beam at PLS-II, which is upgraded machine from PLS with 3 GeV, 20 insertion devices, and now on user service. These srf cavities have been prepared during last 3 years. Each cavity was tested with higher than 2 MV rf voltage and 125 kW standing wave power at CW mode after installation at storage ring. PLS-II is on user operation with 200 mA beam current now, and on the way of beam current improvement upto 400mA, by synchrotron conditioning for beam chamber and in-vacuum udulators. Upto 200 mA beam current no beam instability from the higher order modes is observed. With top-up mode operation, the errors of amplitude of rf field and phase are recorded as 0.3% and 0.3 degree peak to peak, respectively during one day. Successful PLS-II upgrade with hardware and its designed performance will be declared at the end of 1st half user run in 2013.

WEPEA012

Study of Laser Wakefield Accelerators as Injectors for Synchrotron Light Sources

laser, synchrotron, lattice, simulation

2519

S. Hillenbrand, V. Judin, A.-S. Müller
KIT, Karlsruhe, Germany
R.W. Aßmann, S. Hillenbrand
CERN, Geneva, Switzerland
O. Jansen, A.M. Pukhov
HHUD, Dusseldorf, Germany

Short bunch lengths, high beam energies, and small facility footprint make Laser Wakefield Accelerators (LWFA) very interesting as injectors for Synchrotron Light Sources. In this paper, we describe exemplary investigations for the ANKA storage ring.

WEPEA025

Chromatic Sextupole Pair Optimization Methods for Enlarging Dynamic Aperture

sextupole, lattice, dynamic-aperture, focusing

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, sextupole, betatron, 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.

WEPEA037

Testing of Symplectic Integrator of Spin-orbit Motion Based on Matrix Formalism

simulation, lattice, electromagnetic-fields

2582

A.N. Ivanov, S.N. Andrianov, N.V. Kulabukhova
St. Petersburg State University, St. Petersburg, Russia
R. Maier, Y. Senichev, D. Zyuzin
FZJ, Jülich, Germany

Investigation of spin-orbital motion in electromagnetic fields requires different numerical methods. Approaches for long-term evolution modelling need both performance and symplecticity. In this paper we discuss matrix maps method for numerical simulation. We examine symplectification and accuracy in terms of electostatic storage ring. The results are compared with traditional symplectic step-by-step methods.

WEPEA067

Beam Optics Measurements through Turn by turn Beam Position Data in the SLS

betatron, optics, luminosity, positron

2663

P. Zisopoulos, Y. Papaphilippou
CERN, Geneva, Switzerland
A. Streun
PSI, Villigen PSI, Switzerland
V.G. Ziemann
Uppsala University, Uppsala, Sweden

Refined Fourier analysis of turn-by-turn (TBT) transverse position data measurements can be used for determining several beam properties of a ring, such as transverse tunes, optics functions, phases, chromatic properties and coupling. In particular, the Numerical Analysis of Fundamental Frequencies (NAFF) algorithm is used to analyze TBT data from the Swiss Light Source (SLS) storage ring in order to estimate on and off-momentum beam characteristics. Of particular interest is the potential of using the full position information within one turn in order to measure beam optics properties.

WEPFI004

Commissioning of First 352.2 MHz - 150 kW Solid State Amplifiers at the ESRF and Status of R&D

booster, cavity, HOM, status

2708

J. Jacob, L. Farvacque, G. Gautier, M.L. Langlois, J.M. Mercier
ESRF, Grenoble, France

Funding: This work receives funding from the EU as work package WP7 in the FP7/CRISP project.
Four 352.2 MHz - 150 kW Solid State Amplifiers (SSA), based on the SOLEIL design and supplied by ELTA/AREVA, are in operation on the ESRF booster since April 2012. A number of interesting effects were observed during commissioning that are inherent to the combination of many RF amplifier modules at high power. While it has only little impact on the booster SSA operated in pulsed regime, some modifications were necessary for the three SSAs that will be delivered by ELTA for an operation in CW on the storage ring. In parallel, the ESRF is developing a more compact SSA using cavity combiners *) instead of the widely adopted coaxial combiner trees. The status of this R&D project will also be reported.

WEPFI012

Conceptual Design of ILSF RF System

cavity, HOM, LLRF, impedance

2723

Kh.S. Sarhadi, H. Ajam, H. Azizi, M. Fereidani, M. Jafarzadeh, S. Pirani, J. Rahighi, R. Safian, A. Shahverdi
ILSF, Tehran, Iran

The Iranian Light Source Facility (ILSF) RF system, consisting of RF cavities, power sources and low-level RF systems, is conceptually designed in accordance with the requirements of ILSF 3GeV storage ring. To achieve the desired 400mA beam current, utilization of the existing HOM-damped cavities is explored and RF system parameters are compared based on the usage of each cavity. Moreover, the choice of solid state amplifier as the RF power source is presented with its available power and structure. This paper, furthermore, explains the conceptual design and functionality of the selected digital LLRF system.

WEPFI033

Development of the HLS 40kW Solid State Amplifier

rf-amplifier, power-supply, damping, synchrotron

2777

L. Lin, G. Huang, C. Li, Y.T. Liu, W. Zhou
USTC/NSRL, Hefei, Anhui, People's Republic of China

A 40kW RF Solid State Amplifier (SSA) will replace the 25kW tetrode amplifier as the new RF power generator of HLS 800MeV electron storage ring. This SSA contains sixty-five 650W amplifier units (one unit drives sixty-four’s), with two-stage combination to reach the 40kW output. All of the components of SSA are prepared and tested, each of them meets the design requirements. The SSA has been assembled, and is in off-line testing now. The process of SSA’s design and manufacture, and the test results are presented in this paper.

WEPFI060

Planar Balun Design with Advanced Heat Dissipation Structure for kW Level Solid-state Amplifier Module Development

coupling, controls, impedance, klystron

2830

T.-C. Yu, L.-H. Chang, M.H. Chang, L.J. Chen, F.-T. Chung, M.-C. Lin, Y.-H. Lin, Z.L. Liu, C.H. Lo, M.H. Tsai, Ch. Wang, T.-T. Yang, M.-S. Yeh
NSRRC, Hsinchu, Taiwan

The power level of solid-state amplifier is continuously growing for advanced accelerator application as the RF power source. Huge amount of solid-state power amplifier (SSPA) modules can contribute several hundreds of kW RF power with high redundancy and reliability. However, with the increasing desire of RF power of single RF station, too much power modules would adversely cause larger area occupation and higher maintenance cost and complexity. Therefore, with the advancement of the RF power on single SSPA, the overall system design and configuration would become much simple and compact. However, the increasing RF of single SSPA would also bring the thermal problem at its chip as well as the output power combining balun. In this paper, kW range SSPA is developed with the novel planar balun structure with good thermal expansion property. With such new planar balun design, the SSPA can operate stably with above 1kW output RF power.

WEPFI061

Petra Cavity Vacuum RF Condition with Field Balance Mechanism for TPS Storage Ring in NSRRC

cavity, coupling, vacuum, controls

2833

T.-C. Yu, L.-H. Chang, M.H. Chang, L.J. Chen, F.-T. Chung, M.-C. Lin, Y.-H. Lin, Z.L. Liu, C.H. Lo, M.H. Tsai, Ch. Wang, T.-T. Yang, M.-S. Yeh
NSRRC, Hsinchu, Taiwan

In the first stage commissioning of TPS (Taiwan Photon source) storage ring in NSRRC, two room temperature Petra cavities will be used. At this commission stage, 100mA with 950keV beam loss is estimated to have 47.5kW beam loss for each cavity. In the meanwhile, the cavity loss at the specified 1.2MV of each cavity will be about 50kW. Therefore, coupling coefficient of 2 is required. However, the initial design specification of Petra cavity has only beta of about 1.7. Hence, the modification of the input coupler is done with the enhancement of its beta as well as advanced water cooling for some heat point. Besides, due to the two-tuner system of Petra cavity, special field-balance tuner control system is also developed. In RF condition for better vacuum up to 1.4MV, some modification of the tuner mechanical structure is also done to reach high vacuum condition (lower than 5*10^-9 Torr) for storage ring requirement.

WEPME037

Fast Orbit Feedback at Taiwan Photon Source

brilliance, controls, feedback, EPICS

3007

A. Bardorfer, P. Leban
I-Tech, Solkan, Slovenia
P.C. Chiu, K.T. Hsu, C.H. Kuo
NSRRC, Hsinchu, Taiwan

Low latency, distributed, Fast Orbit Feedback (FOFB) application, based on singular value decomposition, entirely implemented in FPGA, has been developed for the Taiwan Photos Source (TPS). The FOFB utilizes the latest Libera Brilliance⁺ units for measuring beam position and the Gigabit Data eXchange (GDX) modules, which take care of global orbit distribution via 6.5 Gbit/s fiber optic or passive Cu links, and provide a large orbit data history buffer. The magnet correction in a matrix form of M = V . PI( S^-1 . U^T . ( Golden-Orbit ) ) is calculated entirely in FPGA, using a massively parallel approach and sent to the magnet power supplies via 2.5 Gbit/s link. The entire FOFB calculation is distributed over 48 GDX modules and the system allows for synchronous (on/off/pause) FOFB control via external input signal. The latencies of 60 ns per BPM for orbit distribution, 1.5 us for FOFB calculation and 1.5 us for magnet data transmission have been measured at TPS test installation in November 2012. The expected total communication and FOFB calculation latency in the TPS final configuration (168 BPMs) is expected to stay within 15-20 us range.

WEPME048

Adjusting and Calibration Method for TPS Laser PSD System

laser, alignment, factory, synchrotron

3037

M.L. Chen, J.-R. Chen, P.S.D. Chuang, H.C. Ho, K.H. Hsu, D.-G. Huang, W.Y. Lai, C.-S. Lin, C.J. Lin, H.C. Lin, H.M. Luo, S.Y. Perng, P.L. Sung, T.C. Tseng, H.S. Wang, M.H. Wu
NSRRC, Hsinchu, Taiwan
J.-R. Chen
National Tsing Hua University, Hsinchu, Taiwan

Laser PSD positioning system is a part of the TPS girder auto-alignment system and is designed for aligning and positioning the straight-section girders of TPS storage ring. Although the components of Laser PSD system are fabricated, assembling and adjusting precisely in advance, the accuracy of Laser PSD system is still influenced by girder fabricating quality, assembling errors and moving errors by transportation. For system correction, Laser beam positions on four sets of PSDs are formulized as an equation and calibrated with Laser tracker ultimately. According to the PSD calibration formula, the two girders of 18m long straight-section can be aligned and positioned within 20um by comparing with Laser tracker. This paper describes the assembly, installation and calibration process of Laser PSD system.

WEPME050

Alignment Design and Status of Taiwan Photon Source

survey, alignment, laser, site

3043

W.Y. Lai, J.-R. Chen, M.L. Chen, P.S.D. Chuang, H.C. Ho, K.H. Hsu, D.-G. Huang, C.K. Kuan, C.-S. Lin, C.J. Lin, H.C. Lin, H.M. Luo, S.Y. Perng, P.L. Sung, T.C. Tseng, H.S. Wang, M.H. Wu
NSRRC, Hsinchu, Taiwan
J.-R. Chen
National Tsing Hua University, Hsinchu, Taiwan

Taiwan Photon Source (TPS) is a new 3-GeV ring with characteristics of great brightness and small emittance, at present under construction at National Synchrotron Radiation Research Center (NSRRC) Taiwan. The positioning of the magnets is highly sensitive to alignment errors, and the entire building will be constructed half underground at depth 12 m relative to Taiwan Light Source (TLS) for stability reasons; for these reasons the survey and alignment work is confined and difficult. To position magnets precisely and quickly, a highly accurate auto-tuning girder system combined with a survey network was designed to accomplish the alignment tasks. The survey network includes a preliminary Global Positioning System (GPS) network and a laser tracking network. The position data from the survey network define a basis for the system of motorized girders to auto-tune and to improve the accuracy. The detailed survey and alignment design, installation process is described in this paper.

WEPME054

Girder Alignment in the Diamond Storage Ring

survey, alignment, controls, quadrupole

3052

M. Apollonio, R. Bartolini, W.J. Hoffman, A.J. Rose, A. Thomson
Diamond, Oxfordshire, United Kingdom
R. Bartolini
JAI, Oxford, United Kingdom

A model of the Diamond Storage Ring describing the misalignment of its 74 girders in terms of displacements and rotations is used to predict the orbit distortions and corrector magnet strengths needed for a zero orbit. Using the data from a survey we compare the effect of a pure magnet misalignment with the natural orbit of the machine. A test with a displaced girder meant to produce a reduction in corrector strength is introduced. Comparison with data obtained from the actual move of the girder is presented and discussed.

WEPME056

Application of Z-transform to Noise Response Modeling of a Bunch-by-bunch Feedback System

feedback, lattice, pick-up, monitoring

3058

C. Yao, N.P. Di Monte, A.J. Scaminaci, H. Shang
ANL, Argonne, USA

Funding: Work supported by the U.S. Department of Energy, Office of Science, under Contract No. DE-ACO2-O6CH11357.
The APS storage ring has an electron beam energy of 7 GeV and a single current of up to 16 mA. Transverse beam instability is corrected by a combination of chromatic correction and bunch-by-bunch feedback system. Noises produced in the pickup circuits is processed and transferred to the beam the same as a beam signal, which contributes to beam motion when the loops are closed. By analyzing the input data stream of the feedback system, one can passively obtain useful information, such as the tunes, loop stability, noise spectrum, etc. This approach has been reported by J. Klute and D. Teytelman. We implemented a passive and continuous tune monitoring process at the APS storage ring. In order to understand the underlying principle, we applied z-transform analysis to the noise-response model of a bunch-by-bunch feedback system. Our analysis shows a clear relationship between the spectrum of the noise response and the open-loop response of the beam. The noise-response model can also be applied to other areas, such as stability and noise analysis of a bunch-by-bunch feedback system. This report presents our analysis and some experimental data.

THPEA019

A Method of Implementing HIRFL-CSR Chopper Controls

controls, heavy-ion, ion, target

3185

K. Gu, S. An, X.J. Liu, W. Zhang
IMP, Lanzhou, People's Republic of China

A method of implementing controls of chopper for HIRFL-CSR (Heavy Ion Research Facility of Lanzhou and Cooler Storage Rings) is introduced. This method is based on an ARM and DSP co-operation system. The control algorithm of this method is based on a data structure which is defined and implemented in the DSP module. Output data is created by the control algorithm and the actually pulse output is triggered by a timer which is achieved through a logic circuit actualized in a FPGA chip. The results show that the method is flexible and the control system matches the chopper regulating requirements.

THPEA055

NESTOR Facility Control System

controls, power-supply, monitoring, vacuum

3267

D.V. Tarasov, V.N. Boriskin, I.M. Karnaukhov, D. Korzhov, V.N. Ljashchenko, A. Mytsykov, A.A. Shcherbakov, V.L. Skirda, V.I. Trotsenko, A.Y. Zelinsky
NSC/KIPT, Kharkov, Ukraine

The general principles of the NESTOR facility control system are presented in the paper. The main features of the systems such as magnetic, vacuum, diagnostic, Rf etc. concerning the control and monitoring are discussed. The first results of the system implementation are presented.

THPEA057

Compensation Schemes for Operation of FEL Wigglers on Duke Storage Ring

wiggler, FEL, lattice, quadrupole

3270

J.Y. Li, H. Hao, S.F. Mikhailov, V. Popov, W. Wu, Y.K. Wu
FEL/Duke University, Durham, North Carolina, USA

Funding: This work is supported in part by the US DOE grant no. DE-FG02-97ER41033.
The Duke FEL is the photon driver for the High Intensity Gamma-ray Source (HIGS). To extend the capabilities of the FEL and HIGS to higher photon energy regions, a FEL wiggler switchyard system was developed in the recent years. This system was installed and commissioned in 2012. The FEL wiggler switchyard is used to change between two planar OK-4 wigglers and two helical OK-5 wigglers in the middle of the FEL straight section in a short period of time (a few days). With a total of six electromagnetic wigglers, the Duke FEL can be operated in a number of wiggler configurations and with a wide range of magnetic fields. The operation of uncompensated FEL wigglers can cause significant changes to the electron beam closed orbit and magnetic lattice. To maintain a sufficiently large dynamic aperture for an efficient injection and good beam lifetime, a set of complex compensation schemes, including magnetic field and lattice compensation, have been developed for the operation of the FEL wigglers. This paper reports the overall architecture and performance of the FEL wiggler compensation schemes and their implementation in the accelerator controls system using the feedforward mechanism.

THPFI043

The Status of the Vacuum System of the MAX IV Laboratory

vacuum, dipole, injection, status

3382

E. Al-Dmour, J. Ahlbäck, D. Einfeld, M.J. Grabski, P.F. Tavares
MAX-lab, Lund, Sweden
Ł. Walczak
Solaris, Kraków, Poland

All the vacuum chambers of the 3 GeV storage ring of MAX IV laboratory are under production. NEG coating R&D has been done to validate technical solutions for the coating process. The standard vacuum chambers for the 1.5 GeV ring of MAX IV and Solaris are designed and they are in the procurement process. We present an update in the technical design of the vacuum chambers following the interaction with the manufacture, the implications on the production due to NEG coating and the design of the vacuum chambers of the 1.5 GeV storage ring.

THPFI067

The Mechanical Design, Fabrication, and Performance of the DCCT for TPS

vacuum, shielding, electron, high-voltage

3451

C.-C. Chang, C.K. Chan, J.-R. Chen, G.-Y. Hsiung, H.P. Hsueh
NSRRC, Hsinchu, Taiwan
J.-R. Chen
National Tsing Hua University, Hsinchu, Taiwan

This paper describes the DC current transformers (DCCT), designed and fabricated for Taiwan Photon Source (TPS); including the mechanical structure, dissimilar material welding process for the DCCT chamber, electronically and vacuum performance testing. In the structure, a ceramic break disc is provided and jointed between to ends of the beam duct. The electrical connection path is interrupted in the beam duct adjacent to the transformer. To avoid the sensor measured the wall current and other unnecessary circulating currents. The DCCT toroid is independent installed outside of a vacuum beam duct to measure the average beam current. In order to reduce the influence of external magnetic field for the sensor, two layers of Mu metal shell are installed. The performance and progress for the DCCT are described in this paper.

THPFI068

Status of the Utility System Construction for the 3 GeV TPS Storage Ring

controls, booster, status, synchrotron

3454

J.-C. Chang, W.S. Chan, J.-R. Chen, Y.F. Chiu, Y.-C. Chung, C.W. Hsu, K.C. Kuo, Y.-C. Lin, C.Y. Liu, Y.-H. Liu, Z.-D. Tsai, T.-S. Ueng
NSRRC, Hsinchu, Taiwan

The construction of the utility system for the 3.0 GeV Taiwan Photon Source (TPS) was started in the end of 2009. The utility building for the TPS ring has been completed in the end of 2012. Main utility equipment has been installed inside. The whole construction of the utility system is scheduled to be completed in the mid of 2013. Total budget of this construction is about four million dollars. This utility system presented in this paper includes the electrical power, cooling water, air conditioning, compressed air and fire control systems.

THPFI077

Construction Status of the TPS Vacuum Systems

vacuum, ion, booster, photon

3472

G.-Y. Hsiung, C.K. Chan, C.H. Chang, C.-C. Chang, S.W. Chang, Y.P. Chang, C.L. Chen, J.-R. Chen, Z.W. Chen, C.M. Cheng, Y.T. Cheng, S-N. Hsu, H.P. Hsueh, C.S. Huang, Y.T. Huang, T.Y. Lee, L.H. Wu, Y.C. Yang
NSRRC, Hsinchu, Taiwan
J.-R. Chen
National Tsing Hua University, Hsinchu, Taiwan

The vacuum systems for the 3 GeV Taiwan Photon Source (TPS) have been constructed since 2010. Most of the vacuum components and equipments have been manufactured and delivered. For the electron storage ring (SR), all the 24 cells of 14 m aluminum vacuum systems have been welded and assembled. The vacuum baking for the cells in the laboratory was undergoing to achieve the ultrahigh vacuum pressure below 1×10^-8 Pa. The vacuum systems accommodated with the insertion devices in the long straight sections have been designed and under manufacturing. For the booster (BR), all the stainless steel chambers including the 0.7 mm elliptical chambers, BPM ducts, and the pumping chambers, have been manufactured. The two transport lines: LTB for Linac to BR and BTS for BR to SR were manufactured. Vacuum chambers for BTS adopt the similar chambers for BR but will be baked to ultrahigh vacuum for connecting with SR without injection window. The beam ducts for LTB will be made of aluminum alloys. The construction works for TPS vacuum systems will be completed before April of 2013 while the installation of the systems in the TPS tunnel will be started immediately.

THPFI078

Design and Experiment on Auto-alignment Control System of Taiwan Photon Source

alignment, laser, controls, feedback

3475

M.H. Wu, J.-R. Chen, M.L. Chen, P.S.D. Chuang, H.C. Ho, K.H. Hsu, D.-G. Huang, W.Y. Lai, C.-S. Lin, C.J. Lin, H.C. Lin, H.M. Luo, S.Y. Perng, P.L. Sung, T.C. Tseng, H.S. Wang
NSRRC, Hsinchu, Taiwan
J.-R. Chen
National Tsing Hua University, Hsinchu, Taiwan

TPS (Taiwan Photon Source) is a new 3-GeV synchrotron ring to be constructed at the NSRRC (National Synchrotron Radiation Research Center), Taiwan. There were hundreds of magnets that must be aligned on the absolute position to keep the electronic beam in the desire path while orbiting. Due to the problems of manpower, set up time, accuracy of adjustment, deformation of the floor, limited workspace and frequent earthquakes in Taiwan, an auto-alignment girder control system was designed to meet this requirement. The design and experiment of the auto-alignment system were tested successfully in the laboratory at NSRRC. The experiment of the auto-alignment control system would be implemented with half of the ring girders in the TPS. The detailed alignment design and status will be discussed in this paper.

THPFI079

Start-up of the NESTOR Facility Vacuum System

vacuum, electron, ion, synchrotron

3478

A.Y. Zelinsky, A.N. Gordienko, V.A. Grevtsev, I.I. Karnaukhov, I.M. Karnaukhov, N.I. Mocheshnikov, A. Mytsykov, V.L. Skirda
NSC/KIPT, Kharkov, Ukraine

The Kharkov X-ray generator NESTOR based on Compton backscattering is under commissioning. The vacuum system of the complex integrates a linear accelerator-injector, the beam transport channel and the electron storage ring with energy range from 40 to 225 MeV. Elements of vacuum chambers, pumping facilities, cleaning surfaces procedures are described. Chambers are made of stainless steel (SS). After vacuum pretesting pressure 5 × 10^-9 Torr in the storage chambers ring achieved.

THPME011

Magnetic Field Design of the BAPS High Precision Quadrupole Magnet

quadrupole, multipole, photon, vacuum

3531

Y.S. Zhu, F.S. Chen, W. Kang, X.J. Sun
IHEP, Beijing, People's Republic of China

The Beijing Advanced Photon Source (BAPS) is a high performance light source planned to be constructed in China. High precision small aperture quadrupole magnets are required in the BAPS storage ring, which needs extremely high mechanical accuracy. Instead of the conventional manufacture method, the coils are comprised of several U-shaped solid copper sheets. So two-piece structure of the iron core can be adopted to reduce assembly error and improve the poles symmetry. Design considerations, 2D and 3D magnetic field calculations are presented in detail, and the needed mechanical precision is estimated according to the error field analysis.

THPME013

MAGNET SUBSYSTEM OF HLS II

dipole, electron, quadrupole, beam-transport

3537

Q. Luo, N. Chen, G. Feng, N. Hu
USTC/NSRL, Hefei, Anhui, People's Republic of China

Funding: Work supported by Natural Science Foundation of China 11005106
To improve the performance of the Hefei Light Source (HLS), in particular to get higher brilliance synchrotron radiation and increase the number of straight section insertion devices, NSRL is now upgrading HLS to HLS II. Most of the magnets had to be replaced in this project. To measure the magnets, set of the magnetic measurement equipment in NSRL are also re-built. New magnets are sample measured, the discreteness and uniformity of integrated magnetic field all meet the requirements. Piecewise fitting and electron tracking of bending magnets for injector and beam transport line were performed and the results showed that the electron trajectory fitted the physical design well.

THPME040

The Installation and Commissioning of the Helium Cryogenic System for theTPS Project

cryogenics, SRF, electron, controls

3600

H.H. Tsai, S.-H. Chang, W.-S. Chiou, F. Z. Hsiao, C.K. Kuan, H.C. Li, T.F. Lin, C.P. Liu
NSRRC, Hsinchu, Taiwan

The construction of an electron accelerator with energy 3 GeV is under way for high brilliance and flux X-ray photon source at NSRRC. There will be eventually four superconducting radio frequency (SRF) cavities installed to maintain the electron energy. The helium cryogenic system has been designed and fabricated to provide the required liquid helium for SRF cavities. The cryogenic system consists of the 700-W refrigerator, the 315-kW variant frequency compressor, the oil removal system, the recovery compressor system, the gas helium buffer tanks, and one 7000-L liquid helium Dewar. The overall system installation and commissioning will be presented and discussed in this paper.

THPME052

Analysis of the NSLS-II Magnet Measurement Data

dipole, quadrupole, sextupole, 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.

THPWA045

Accelerator R&D in the QUASAR Group

antiproton, electron, ion, diagnostics

3732

C.P. Welsch
Cockcroft Institute, Warrington, Cheshire, United Kingdom
C.P. Welsch
The University of Liverpool, Liverpool, United Kingdom

Funding: Work supported by the STFC Cockcroft Institute Core Grant No. ST/G008248/1, HGF and GSI under contract VH-NG-328 and the EU under contracts 215080, 289181 and 289485.
The QUASAR Group is a pan-European research group based at the Cockcroft Institute in the UK. It carries out R&D into methods to decelerate and store very low energy antiproton and exotic ion beams, beam diagnostics developments for medical accelerators, including imaging and dosimetry, as well as opto-electronics and laser applications. This contribution presents the latest results of the Group's studies into the USR/ELENA/AEgIS antimatter facilities, novel least destructive beam profile monitors for medical and industry applications, as well as laser applications for accelerators, includingμaccelerators and a laser velocimeter.