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storage-ring

         
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TUYMA02 Commissioning of the Indus-2 Storage Ring synchrotron, vacuum, booster, synchrotron-radiation 61
 
  • V. C. Sahni
    RRCAT, Indore (M. P.)
  An overview of the 2.5 GeV synchrotron radiation source, Indus-2, which has been set up at RRCAT, Indore will be presented with emphasis on commissioning details. The accelerator is used both as a booster and as a storage ring. Using an injection energy of 550MeV, the beam energy has been ramped up to 2.4 GeV. Two beam lines have also been installed, one for x-ray diffraction (XRD) and another for extended x-ray absorption fine structure (EXAFS) studies. To condition the vacuum chamber of the ring, regular operation has been restricted to 2 GeV. To test the XRD beam line, first diffraction pattern from a pyrolitic graphite sample was recorded with bending magnet synchrotron light with ring operating at 2 GeV. Indigenous technological base created in setting up Indus-2 would be used while participating in up coming international accelerator projects.  
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TUYMA03 Commissioning and Status of the Diamond Storage Ring feedback, injection, vacuum, closed-orbit 66
 
  • R. P. Walker
    Diamond, Oxfordshire
  Diamond is the UK's new 3'rd Generation Synchrotron Light Source. The construction phase has just concluded and the first operation with external users is about to begin. This presentation will concentrate on the second phase of commissioning of the storage ring at the full energy of 3GeV, which began in September 2006, with a full set of 7 Phase I Insertion Devices installed. The current status and future plans will also be described.  
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TUPMA005 Simulation Study on Bunch Lengthening electron, single-bunch, damping, synchrotron 106
 
  • Y. Sun, Z. Y. Guo
    PKU/IHIP, Beijing
  • J. Gao
    IHEP Beijing, Beijing
  The bunch lengthening phenomenon is resulted from one of the most severe single bunch instabilities in electron storage rings. As for BEPCII, controlling the bunch length is the most critical task to fulfil the designed luminosity goal. A new code is developed to calculate the single bunch length and energy spread in storage rings using FORTRAN. In this code, the wake field is calculated using an analytical formula. The bunch length and energy spread under different bunch current are calculated for BEPCII. The tracking results clearly show that the microwave instability threshold is around 65 mA for BEPCII storage ring. The tracking results of this code are in good accordance with those from other codes.  
 
TUPMA012 Measurement of Bremsstrahlung Dependent on Stored Beam Current electron, vacuum, radiation, ion 115
 
  • Y. Yamamoto
    Ritsumeikan University, Kusatsu-City, Shiga
  Bremsstrahlung was measured as a function of stored beam current using the BGO scintillation spectrometer at the compact superconducting storage ring of Ritsumeikan University. Bremsstrahlung is emitted for collision of stored electrons and residual gas on the beam orbit. Yield of bremsstrahlung depend on stored beam current and residual gas density. We tried to determine gas density on the beam orbit by present measurement.  
 
TUPMA014 State of the SLS Multi-bunch Feedback feedback, synchrotron, injection, kicker 118
 
  • M. Dehler, G. Marinkovic, P. Pollet, T. Schilcher
    PSI, Villigen
  In order to control coupled bunch oscillations in the SLS storage ring, feedback systems for all three planes were forseen. The filters are realized as fully digital bunch by bunch systems. With the development of dedicated Analog to Digital and Digital to Analog Converter boards, the feedbacks could be commissioned. Important parts of the computations for the transverse planes could be implemented into the ADC FPGA, making the DSPs originally planned to be used obsolete and allowing for an extremely low latency time of 200 ns. The systems give a larger freedom in the choice of the beam optics and also lead to a better closure of the injection bump during top up mode.  
 
TUPMA015 Radiation Safety Considerations of the Operation of INDUS-1 Synchrotron Radiation Source radiation, photon, shielding, synchrotron 121
 
  • H. Nair, V. Dev, M. K. Nayak, V. Verma, thakkar,k.k. thakkar
    RRCAT, Indore (M. P.)
  • P. K. Sarkar
    DAE/VECC, Calcutta
  • D. N. Sharma
    Bhabha Atomic Research Centre, Trombay, Mumbai
  Radiological safety aspects of the operation of the electron storage ring, Indus-1 (450 MeV, 100 mA) is described in the paper. The ring is provided with a modular hybrid shielding comprising of mild steel and lead through which synchrotron radiation (SR) beam lines pass out. During the commissioning phase several radiation protection problems like streaming of high-energy bremsstrahlung x-rays, through front ends of SR beam lines, shield joints, its detection and containment were encountered. Experimental measurements on the response of conventional radiation monitors with respect to water phantom were then carried out to evaluate the dose build up factors in the streaming high-energy radiation field. The studies lead to the deduction of correction factors for the monitors for use in Indus-1. Improvement in monitor response on account of spectral degradation through shield and radiation levels during accidental beam loss are other problems, which are evaluated. Details of the radiation protection programme, radiation physics studies, the current status of radiation levels and access control are presented.  
 
TUPMA018 Compact Hard X-Ray Synchrotron Radiation Source with Superconducting Bending Magnets synchrotron, booster, synchrotron-radiation, radiation 127
 
  • G. Kulipanov, E. Antokhin, A. Gvozdev, P. V. Logachev, N. A. Mezentsev, V. E. Panchenko, A. V. Philipchenko, Y. V. Rakshun, A. V. Utkin, N. Vinokurov, K. Zolotarev
    BINP SB RAS, Novosibirsk
  Synchrotron radiation (SR) with relatively hard spectrum (up to 50 keV) is necessary for realization many modern X-ray analytical methods. These methods can be effectively used in industrial and medical applications, in universities and scientific centers. So, the task of developing of compact source of hard synchrotron radiation is very perspective. Budker INP has a big experience for developing and fabrication of high field superconducting insertion devices for different SR centers. In frame of this activity a superconducting bending magnet with field up to 9.6 T was fabricated for BESSY-II and commissioned in 2004. This magnet also became a prototype for compact hard SR source. A project of such storage ring is under developing in Budker INP now. This design fixed beam energy to 1.2 GeV, ring circumference about 52 m. Estimated horizontal equilibrium emittance will better than 20 nm. This report includes a detailed description of main parameters and magnetic structure of designed storage ring as well as preliminary design of injector system and beamline layout.  
 
TUPMA026 A Prototype of the SSRF Power Supply Control System controls, power-supply, booster, linac 139
 
  • J. G. Ding, L. R. Shen, H. Zhao, H. J. Zhu
    SINAP, Shanghai
  The Shanghai Synchrotron Radiation Facility (SSRF) is a third generation, 3.5GeV synchrotron light source currently being constructed at the Shanghai Institute of Applied Physics (SINAP) in Shanghai, China. There will be approximately 700 magnet power supplies (PS) in the storage ring, booster, linac and transport lines. According to the requirement of control precision, reliability and stability of the magnet power supplies, we decided to use the PSI-designed PS control system for PS control. Each magnet PS has a local digital controller for a digital regulation loop and a 5MHz optical point-to-point link to the VME level. The low-level EPICS interface is identical for all magnet power supplies. Industry Pack (IP) modules with standard carrier cards are used as VME interface with eight links per VME card. The VME-based front-end consists of a PowerPC7455 SBC board, IP carriers and IP I/O modules. A prototype of the PS control system has been setup and tested at SINAP. Control and monitoring of the prototype has been implemented with EPICS toolkit. This paper describes the progress and software development of the prototype, and discusses our near future plan.  
 
TUPMA028 Status of the Photon Factory undulator, photon, factory, insertion 142
 
  • S. Sakanaka, S. Asaoka, W. X. Cheng, K. Haga, K. Harada, T. Honda, T. Ieiri, S. Isagawa, M. Izawa, T. Kageyama, T. Kasuga, M. Kikuchi, Y. Kobayashi, K. Kudo, H. Maezawa, A. Mishina, T. Mitsuhashi, T. Miyajima, H. Miyauchi, S. Nagahashi, T. T. Nakamura, H. Nakanishi, T. Nogami, T. Obina, K. Oide, M. Ono, T. Ozaki, C. O. Pak, H. Sakai, Y. Sakamoto, H. Sasaki, Y. Sato, T. Shioya, M. Tadano, T. Takahashi, S. Takasaki, Y. Tanimoto, M. Tejima, K. Tsuchiya, T. Uchiyama, A. Ueda, K. Umemori, S. Yamamoto, S. I. Yoshimoto
    KEK, Ibaraki
  Two synchrotron light sources are in operation at the High Energy Accelerator Research Organization (KEK): the Photon Factory (PF) storage ring and the Photon Factory Advanced Ring (PF-AR). The 2.5-GeV PF storage ring was largely upgraded during March to September, 2005. Through this upgrade, existing ten straight sections were extended in length, and four short-straight sections were newly created. New short-period undulators were then installed in the new sections. Other developments, including a top-up injection, are in preparation. The other light source, the 6.5-GeV PF-AR, is routinely operated with a single bunch. It provides high-flux hard X-rays for research including time-resolved pulse X-ray experiments. In the PF-AR, four in-vacuum undulators and one elliptically polarized multipole wiggler are in operation. Moreover, a new in-vacuum undulator was installed in summer, 2006. Some operational developments were also carried out. In this presentation, we report both hardware and operational advances of the PF and the PF-AR storage rings.  
 
TUPMA034 Operation Experience of Top-up injection at Taiwan Light Source injection, photon, beam-losses, insertion-device 151
 
  • G.-H. Luo, H.-P. Chang, C.-T. Chen, J. Chen, J.-R. Chen, C.-C. Kuo, K. S. Liang, Y.-C. Liu, R. J. Sheu, D.-J. Wang
    NSRRC, Hsinchu
  The storage ring of Taiwan Light Source (TLS) has one Superconducting (SC) cavity, one SC wavelength shifter, and two SC wigglers installed during last two years. The operation mode was also upgraded to have the capability of top-up injection. Top-up is an operation mode in which the beam current is maintained above certain level by frequent injections in the storage ring. The current stability maintains in the range of 10-3 for long period of operation. It provides constant thermal loading on all components in the storage ring and the optics components of beamlines, as well as constant signal to the beam position monitor. The top-up injection is a routine operation mode during user shifts at TLS. Statistics, operation experience and future expansion will be discussed in this paper.  
 
TUPMA037 Project of Infrared Storage Ring Free Electron Lasers at AIST electron, undulator, free-electron-laser, klystron 160
 
  • N. Sei, H. Ogawa, K. Y. Yamada, M. Y. Yasumoto
    AIST, Tsukuba, Ibaraki
  Development of free electron lasers (FELs) with a compact storage ring NIJI-IV in the near and middle infrared regions is planned in National Institute of Advanced Industrial Science and Technology (AIST). Infrared FELs with a linear accelerator have already been developed and used for various applications in many FEL facilities. However, there is no storage ring FEL (SRFEL) which can oscillate in those regions widely. Although an SRFEL is inferior to a linear accelerator FEL in the average power, it has an extremely stable wavelength and its line width is as narrow as that of a monochromatic light in a synchrotron radiation facility. The average power of the synchrotron radiation in an infrared beam line is about 10 micro-watt at most. Then the SRFEL can be expected as a light source which is more intense than the synchrotron radiation. The output power which is our target is 1 mill-watt. We are aiming at SRFEL oscillations in a wavelength region from 1 to 10 micron which include the fingerprint region partly.

sei.n@aist.go.jp

 
 
WEPMA030 The Bunch Lengthening due to Electron Cloud in Positron Storage Ring electron, positron, simulation, damping 366
 
  • Y. D. Liu
    IHEP Beijing, Beijing
  The electron cloud generates not only the transverse wake field but also the longitudinal wake field. The mechanism of the bunch lengthening due to longitudinal wake produced by the electron cloud in the positron storage ring is analyzed. The longitudinal field, which depends on the density of the electron cloud in the storage ring, arises from the accumulation of the electrons near to the center of the bunch during the bunch passage. Based on the longitudinal wake field, tracking method is used to simulate variation of the bunch longitudinal profile in different electron cloud density. According to simulation, the longitudinal action on the bunch from electron cloud is the similar as the potential-well distortion to shift the bunch distribution and give a rise to the bunch deformation. The result has been used to the simulation for BEPCII.  
 
WEPMA049 Design of a Stripline Kicker for Tune Measurement in SESAME Storage Ring impedance, betatron, synchrotron, kicker 390
 
  • S. Varnasseri
    SESAME, Amman
  Traveling wave electrodes are commonly used in synchrtorn light sources as a tool for both excitation and beam sensing for tune measurement. Noraml longitudinally symmetric stripline has a posivie sine wave response in the frequency domain. An exponentially taperd stripline has a constant coupling impedance versus frequency and better frequency response. In this paper the design of stripline kicker for the purpose of tune measurement in the SESAME storage ring is reported.  
 
WEPMA054 Photon Beam Position Monitor with Hydraulic Level System photon, diagnostics, feedback, controls 398
 
  • Y. J. Han, J. Choi, J. Y. Huang, S. N. Kim, Y.-C. Kim
    PAL, Pohang, Kyungbuk
  • I. S. Ko
    POSTECH, Pohang, Kyungbuk
  In a synchrotron radiation source like the Pohang Light Source (PLS), a great effort has been made on beam stability improvements. For the beamline user-sided orbit feedback, Photon Beam Position Monitor(PBPM) provides more practical informations on the position and angle of the electron beam at the center of the bending magnet, compared the closed orbit data. For improvement of the orbit stability, PBPMs are used in PLS. However, as the ground of PLS moves about 2mm every year, we also monitor the level difference between the storage ring and the beamline floor with Hydraulic Level System (HLS). The design and experimental results of PBPM with HLS will be presented.  
 
WEPMA059 Commissioning of the Australian Synchrotron with Libera EBPPs and Matlab synchrotron, controls, quadrupole, lattice 404
 
  • Y. E. Tan, M. J. Boland, R. T. Dowd, G. LeBlanc, M. J. Spencer
    ASP, Clayton, Victoria
  The Australian Synchrotron (AS) is equipped with a full compliment of 98 BPMs attached to Libera Electron Beam Position Processors (EBPPs) that are capable of measuring turn-by-turn/first turn and averaged beam positions simultaneously. The BPM system coupled with Matlab applications has simplified the process of commissioning. This report will highlight how the various tools have been utilised and show the results of some studies.  
 
WEPMA060 Measurements using the X-Ray and Optical Diagnostic Beamlines at the Australian Synchrotron diagnostics, synchrotron, emittance, single-bunch 407
 
  • G. LeBlanc, J. C. Bergstrom, M. J. Boland, R. T. Dowd, M. J. Spencer, Y. E. Tan
    ASP, Clayton, Victoria
  • D. J. Peake, R. P. Rassool
    Melbourne, Melbourne
  First Light has been achieved on the diagnostic beamlines at the Australian Synchrotron 3 GeV storage ring. The X-ray Diagnostic Beamline (XDB) has been used to measured the beam size, divergence and emittance, while the Optical Diagnostic Beamline (ODB) has been used the measure the bunch length and turn-by-turn stability. Both beamlines receive dipole radiation from a bend magnet and provide continuous diagnostic data to the control room. The beamlines compliment each other with the ODB providing mainly longitudinal (temporal) information, while the XDB measures predominantly transverse (spatial) information. A brief description is given of the equipment on each beamline and the commissioning results are presented.  
 
WEPMA063 Diagnostic Supports for Top-Up Operation at TLS injection, diagnostics, synchrotron, linac 410
 
  • K. H. Hu, J. Chen, K. T. Hsu, C. H. Kuo, C.-J. Wang
    NSRRC, Hsinchu
  Routine top-up operation of Taiwan Light Source (TLS) was started from October 2005. Various diagnostics tools are needed to support the top-up operation. These tools include diagnostics for injection efficiency, filling pattern, tune, instability, loss pattern measurement. Design consideration, details and future plans of these diagnostics will be summary in this report.  
 
WEPMA065 Experience of Beam Diagnostic Systems in Commissioning Stage of Indus-2 diagnostics, injection, synchrotron, betatron 413
 
  • T. A. Puntambekar, L. K. Babbar, A. Banerji, A. Deep, A. C. Holikatti, D. K. Joshi, A. Karnewar, S. Kotaiah, M. Kumar, R. K. Nathwani, S. K. Suhane, Y. Tyagi, S. Yadav
    RRCAT, Indore (M. P.)
  Indus-2 is a 2.5 GeV synchrotron radiation source under commissioning at this center. Beam injection trials in the storage ring began in August 2005. Beam diagnostics systems played an important role during commissioning of the storage ring. Beam diagnostic systems installed in the machine include beam profile monitor, orbit measurement system, wall current monitor, DCCT, striplines, tune measurement system and sighting beam line. This paper describes the diagnostic systems, experience of operation of these systems during commissioning, results obtained and the present status. During the initial stages of beam injection and circulation in INDUS-2 wall current monitors, beam profile monitors and sighting beam line proved to be of utmost help. In the current stage of near routine beam operation, the main focus has shifted to the measurement of beam parameters with the objective of improving beam current and lifetime. A study of beam orbit measurement was recently taken up. The beam orbit was measured before and after generating an orbit perturbation. A study of betatron tune measurements has been initiated.  
 
THZMA01 Status of SOLEIL Project vacuum, controls, insertion, feedback 578
 
  • L. S. Nadolski, J. C. Besson, P. Brunelle, A. Buteau, L. Cassinari, M.-E. Couprie, J.-C. Denard, J.-M. Filhol, C. Herbeaux, J.-F. Lamarre, V. Le Roux, P. Lebasque, A. Lestrade, M.-P. Level, A. Loulergue, A. Madur, P. Marchand, A. Nadji, R. Nagaoka, B. Pottin, J. B. Pruvost, F. Ribeiro, M.-A. Tordeux
    SOLEIL, Gif-sur-Yvette
  SOLEIL, the 2.75 GeV new French Synchrotron Radiation Facility, located near Paris, is under commissioning. Here are reported the first main results obtained on the storage ring. The beam dynamics characterisation of the 3.7 nm.rad optics is presented, as well as the first measurements of the instability thresholds. Furthermore comparison is made with expectations of the linear optics model and instability calculations. First experience with innovative devices and technologies is also presented: TANGO control system, BPM system, extensive use of NEG coating vessels, RF system (Solid state amplifiers, and superconducting cavities). Six insertion devices accommodating a wide energy range from 5 eV to 50 keV (in-vacuum, Apple II, large period electromagnetic types) are now installed on the machine and some of them are giving the first photon beam to the beamlines. Finally a roadmap towards beam delivery to users will be presented (orbit stability, beam filling patterns, top-up operation).  
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THZMA02 Status of the Australian Synrotron project injection, booster, synchrotron, diagnostics 583
 
  • G. LeBlanc
    ASP, Clayton, Victoria
  The Australian Synchrotron, a synchrotron light facility based on a 3-GeV electron storage ring, is currently being commissioned at a site in the Metropolitan District of Melbourne. On July 14, 2006 less than three years after earth moving machines started to prepare the site, beam was captured, accumulated and stored in the storage ring. Storage ring commissioning, and beamline installation and commissioning will continue through March 2007, after which the facility will officially become operational. In this paper we give a brief overview of the facility and its beamlines, followed by the latest results from accelerator commissioning activities.  
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THZMA03 Construction of Shanghai Synchrotron Radiation Facility power-supply, linac, controls, vacuum 593
 
  • Z. Zhao, H. Ding, H. Xu
    SINAP, Shanghai
  The Synchrotron Radiation Facility (SSRF), a third generation light source based on a 3.5GeV storage ring, is under construction at Zhang-Jiang Hi-Tech Park in Shanghai. The SSRF groundbreaking was made in December 2004 and the construction of the SSRF main and auxiliary buildings was completed in November 2006. The construction and installation of the SSRF accelerator components are under going with the target schedule of starting storage ring commissioning in April 2008 and the user operation in April 2009. This paper reports the construction progress of the Shanghai Synchrotron Radiation Facility.  
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THZMA04 Status and Future of Taiwan Light Source injection, emittance, feedback, synchrotron 602
 
  • K. S. Liang, J.-R. Chen, C.-C. Kuo, G.-H. Luo, D.-J. Wang
    NSRRC, Hsinchu
  The Taiwan Light Source of National Synchrotron Radiation Research Center (NSRRC) has reached a very stable operation condition and productive scientific outputs. The copper Doris RF cavities were replaced with a niobium Superconducting (SC) RF cavity in order to eliminate higher-order-modes and deliver higher beam current. Superconducting wigglers were installed to provide higher flux at higher photon energy. The storage ring is now operated at 300 mA top-up mode with better than 97 % of beam availability during users shifts. The original layout of the magnets has been greatly modified to accommodate one SC wavelength shifter at the injection section, one SC wiggler at the RF cavity section, and three SC wigglers in achromatic sections in addition to the original design of one wiggler and three undulators. In view of the future scientific demands, the NSRRC is proposing to construct a new synchrotron storage ring of 3.0~3.3 GeV and ultra low emittance, the Taiwan Photon Source (TPS). The TPS will provide brilliant X-rays at 1021 photons/s/0.1%BW /mm2/mr2 by SC undulator upon its completion, making it the brightest synchrotron light with the finest performance in the world.  
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THC3MA01 Operation and Recent Developments at the Siam Photon Source photon, synchrotron, insertion, insertion-device 607
 
  • P. Klysubun, S. Cheedket, G. G. Hoyes, C. Kwankasem, M. Oyamada, S. Rugmai, S. Rujirawat
    NSRC, Nakhon Ratchasima
  The Siam Photon Source (SPS) is a dedicated synchrotron radiation facility located in Nakhon Ratchasima, Thailand. After successful commissioning and recent energy upgrade from 1.0 GeV to 1.2 GeV, the Siam Photon Source is currently well into user mode of operation. The light source is now providing routinely synchrotron radiation in the vacuum ultraviolet and soft x-ray spectral ranges to both internal and external researchers. In this report we describe the overview of the current machine performance including user availability, the progresses made recently, and the planned machine improvements, which emphasizes on improving beam stability and machine reliability. Plan to install two insertion devices, a permanent magnet planar undulator and a superconducting magnet wavelength shifter, is also discussed.  
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THC3MA02 SESAME Status vacuum, sextupole, dipole, synchrotron 610
 
  • G. Vignola, A. Amro, M. Attal, H. Azizi, A. Kaftoosian, F. Makahleh, M. M. Shehab, H. Tarawneh, S. Varnasseri
    SESAME, Amman
  An update of the status of SESAME is presented. SESAME is a third generation light source facility, with an e-beam energy of 2.5 GeV, located in Allan, Jordan. The emittance is 26 nm.rad and 12 straights are available for insertion devices. The injector consists of a 22.5 MeV Microtron and 800 MeV booster synchrotron, with a repetition rate of 1 Hz. The conceptual design of the accelerator complex has been frozen, and the engineering design is well advanced. The Phase I scientific program for SESAME has also been finalized, and it foresees 6 beam lines, including 2 IR ports. The construction of the SESAME building is in progress, and the beneficial occupancy is expected by the spring of 2007. The completion of the accelerators complex construction is scheduled for 2010.  
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THC3MA05 Bunch Compression using the Transport Line and Short Bunch revolving in NewSUBARU linac, injection, radiation, electron 619
 
  • S. Suzuki, T. Asaka
    JASRI/SPring-8, Hyogo-ken
  • Y. Hisaoka, T. Matsubara, T. Mitsui, Y. Shoji
    NewSUBARU/SPring-8, Laboratory of Advanced Science and Technology for Industry (LASTI), Hyogo
  We have demonstrated the idea of circulating a short, intense linac bunch for some tens of turns in an isochronous ring. We compressed a bunch from the SPring-8 linac to a few picoseconds rms by means of an energy compression system and a beam transport line from the linac to NewSUBARU. The NewSUBARU storage ring was set to a quasi-isochronous condition and the bunch circulated for some tens of turns after injection while maintaining the short bunch length. And we measured the coherents synchrotron radiation at 90-140GHz by semiconducter detector. The bunch length is maintained in about 20 microseconds, but the CSR power decreases little by little.  
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THPMA013 Effect of Eddy Current in Magnetic Lamination on Pulsed Septum Magnet Response septum, injection, kicker, vacuum 643
 
  • R. S. Shinde, Gaud, V. K. Gaud, S. Kotaiah, Kumar, S. Kumar, R. K. Mishra, Pandey, M. M. Pandey, Pareek, P. Pareek
    RRCAT, Indore (M. P.)
  Indus-2 Pulsed septum magnets have been developed using 0.1 mm thick Ni-Fe laminations, which were electrically insulated from each other. These laminations were annealed in Hydrogen furnace & then oxidized in a Air controlled furnace. A process has been optimized to get 10-micron oxidization thickness on both sides of lamination. A pulse test set up has been built to characterize the laminations at high magnetization rates (‘~ 1 T/us). Electromagnetic simulation of the main field in the gap & field free region ' leakage/stray field for Septum magnets were performed using Flux 2D. A stray field (~1G-m) was stringent so as not to distort circulating beam. Magnetic screen has been optimized to minimize the stray fields. A pulsed thin & thick septum magnets were excited using 50 ms half sine wave, the field homogeneity in the order of 100 PPM & Integrated stray field 0.7 G-m has been obtained. This paper focus on Eddy current effect in lamination on pulse magnetic response, attenuation, phase shift & resonance in lamination due to pulse frequency. Modeling of magnetic circuit, shielding of septum & pulse response of NiFe lamination at high magnetic amplitudes(1.2T ) is also presented.

R. K. Mishra, P. Pareek, M. M.Pandey, V. Gaud, S. Senthil kumar

 
 
THPMA023 Construction of SSRF Magnet Power Supply System power-supply, controls, booster, linac 664
 
  • T. J. Shen, H. G. Chen, C. L. Guo, Z. M. Hu, D. M. Li, R. Li, H. Liu, S. L. Lu, X. Wang, W. F. Wu, R. N. Xu, S. M. Zhu
    SINAP, Shanghai
  The Shanghai Synchrotron Radiation Facility (SSRF) is a third-generation synchrotron radiation light source under construction. In SSRF, there are 520 sets of magnet power supplies for the storage ring and 163 sets for injector. All of the power supplies are in PWM switched mode with IGBT. A high precision stable output power supply for 40 dipoles rated at 840A/800V with the stability of ±2·10-5/8hrs will be used for storage ring. 200 sets of chopper type power supply will be used for exciting main winding of quadrupoles respectively. In booster ring, two sets of dynamic power supply for dipoles and two sets for quadrupoles will run at the biased 2Hz sinusoidal wave. All above power supplies will work with digital power supply controllers designed by PSI. All power supplies are being manufactured at professional power supply companies in China.  
 
THPMA051 Cure of Temperature Fluctuations on the Nitrogen-cooled Sections of a CESR-type SRF Module controls, vacuum, shielding, superconducting-RF 700
 
  • M.-C. Lin, L.-H. Chang, M. H. Chang, S.-S. Chang, F.-T. Chung, M. H. Tsai, Ch. Wang, T.-T. Yang, M.-S. Yeh
    NSRRC, Hsinchu
  A strong correlation between tuner motion of the SRF module and the pressure fluctuation of the shielding liquid nitrogen flow is observed. The double elbow waveguide section with nitrogen cooling channels is one of the possible fluctuation sources. Thus it is tested along to investigate the mechanism of pressure and temerature fluctuations, whereas a phase separator with pressure regulation function is used to stabilize the supply pressure of liquid nitrogen. Also it is tried to stabilize the pressure fluctuation by optimizing and regulating the vent flow rate. System setup and primary test results are presented herein.  
 
THPMA056 Design of the TPS Bending Chamber vacuum, synchrotron, synchrotron-radiation, radiation 703
 
  • C. K. Chan, C.-C. Chang, C. L. Chen, G.-Y. Hsiung, S-N. Hsu, H. P. Hsueh, Y.-H. Liu, J. Y. Yang
    NSRRC, Hsinchu
  • J.-R. Chen
    NTHU, Hsinchu
  The article describes the design, manufacture and treatment of the bending vacuum chamber (B-chamber) of the 3GeV Taiwan Photon Source (TPS). The B-chamber is a 5m long aluminum alloy chamber with an antechamber on the near side of the electron-beam duct. The design of B-chamber is aimed to confine the outgassing source and to reduce the power density and photon stimulated desorption (PSD) induced by synchrotron radiation. Besides, the simulations of B-chamber deformation due to evacuation and thermal distribution of the aluminum crotch absorber are also described.  
 
THPMA059 The Vacuum System for the SSRF Storage Ring vacuum, photon, radiation, synchrotron 708
 
  • D. K. Jiang
    SINAP, Shanghai
  SSRF is the first third generation light source in China. The storage ring vacuum system adopts SUS316LN material chambers with antechamber structure and discrete absorbers. There are several types of absorbers in the storage ring. TSP and SIP+NEG combined pumps are used. A single finger RF shielded structure is applied in bellows. The models of vacuum chambers (SUS316L material), absorbers and combined pumps (SIP 200l/s + NEG WP1250) were developed and tested. In order to check the vacuum system design and the fabrication technology, the model components were installed together with magnets and girders to forming a standard cell prototype.

Only for poster

 
 
THPMA084 A Mechanical Installation Prototype for the SSRF Storage Ring vacuum, damping, dipole, quadrupole 755
 
  • L. Yin, H. W. Du, D. K. Jiang, X. Wang, Z. B. Yan, C. H. Yu, Q. G. Zhou
    SINAP, Shanghai
  The engineering design of the mechanical system for the SSRF storage ring was finished. The first group components in each system, such as the magnets, vacuum chambers, BPMs, girders and other hardware, were fabricated and tested, respectively. In order to check the overall design and the installation procedure, a lattice cell prototype was installed by using these components. Based on it, the related utility system was installed and checked. The dynamic properties of the magnet-girder assembly were also tested in this prototype. Most of the design was confirmed during the installation, but still some problems were found. The modification for the overall design and some components design has been made before their mass production. The detail design and installation of the cell installation prototype and the test results are described in this paper.  
 
THPMA093 Vibration Evaluation for Utility Instruments and Water Piping System in TLS vacuum, quadrupole, controls, synchrotron 776
 
  • Y.-H. Liu, J.-C. Chang, J.-R. Chen, D.-J. Wang
    NSRRC, Hsinchu
  In order to design the brightness new synchrotron light source-TPS in NSRRC. The vibration issue is more restrict nowadays. The position stability in subsystems is important to beam dynamic performance. The vibration source from utility systems is one source of the instability factor. The purpose of this paper is to estimate the vibration source from water systems, AHU systems and the piping system in utility group. Analysis the vibration path from ground and the piping system is the first step. Then, propose the feasible proposals to eliminate the vibration source and reduce the vibration propagation path. The construction standards for water systems and AHU systems will be established before design. The test is based on TLS operating systems. Besides, the distance and path between utility building and storage ring is another factor for vibration propagation. To eliminate the vibration source and propagation path in TLS will be the next step. The experimental results will be the foundation of TPS construction in the future.  
 
THPMA100 Multipacting Study of Linac Prebuncher at CAMD electron, linac, focusing, power-supply 785
 
  • Y. Wang
    LSU/CAMD, Baton Rouge, Louisiana
  Multipacting currents can absorb RF energy and produce breakdown in the prebuncher cavity of CAMD linac*. This phenomenon starts when the magnetic field to focus the electron beam is applied. The multipacting has been studied in different magnetic field and RF electric field, and can be eliminated by RF processing. In the paper, the theoretical and experimental results of multipacting study will be presented; moreover, the operability of the system will be analyzed.

* Y. Wang et al., “Upgrades of the Linac System at CAMD”. PAC2003, Portland, May 2003, p. 2892.