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synchrotron

           
Paper Title Other Keywords Page
MOXMA01 Present Status of J-PARC linac, klystron, quadrupole, rfq 1
 
  • F. Naito
    KEK, Ibaraki
  Japan Proton Accelerator Research Complex (J-PARC) is the high-intensity proton accelerator aiming to realize 1 MW class of the beam power. It is the joint project between High Energy Accelerator Research Organization (KEK) and Japan Atomic Energy Agency (JAEA). J-PARC consists of a 400MeV linac, a 3GeV Rapid Cycle Synchrotron (RCS) and a 50 GeV Main Ring (MR). At the present stage, the beam energy from the linac is 181 MeV and it will be extended to 400 MeV at the near future. Most components of the linac have been installed in the beam line, and the remaining preparation for the beam commissioning is underway. Since the beam commissioning of the linac will start in December 2006, the first result of the linac beam test will be reported at the conference. The beam commissioning for the RCS is scheduled in the middle of 2007. Finally that for the 50GeV synchrotron will be started at the beginning of 2009.  
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MOZMA03 Status of FFAG Developments acceleration, focusing, resonance, proton 21
 
  • S. Machida
    STFC/RAL/ASTeC, Chilton, Didcot, Oxon
  Status of FFAG Developments will be talked, which includes nonscaling FFAG for muon acceleration, scaling FFAG for medical and industrial use. The talk focuses on beam dynamics points of view, as well as the on-going project around the world.  
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TUYMA02 Commissioning of the Indus-2 Storage Ring vacuum, storage-ring, 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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TUPMA005 Simulation Study on Bunch Lengthening electron, storage-ring, single-bunch, damping 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.  
 
TUPMA006 Study on the BEPCII Lattice lattice, luminosity, dynamic-aperture, injection 109
 
  • Y. Sun, Z. Y. Guo
    PKU/IHIP, Beijing
  • J. Gao
    IHEP Beijing, Beijing
  BEPCII, the upgrading project of the Beijing Electron-Positron Collider (BEPC), has been designed with a luminosity of 1033 cm-2s-1 at the -charm energy region. According to the beam-beam simulation results, the luminosity of BEPCII with a crossing collision angle of 11 mrad is about 0.50×1033 cm-2s-1 with the original operation mode at the working point of 6.53/5.58. To increase the operating luminosity of the BEPCII, a low momentum compaction factor (?P) collision mode has been studied which can increase the luminosity to 0.54×1033 cm-2s-1. If the bunch length of the low ?P mode is reduced from 1.5 cm to 1.2 cm, a mode with vertical beta function at IP equal to 1.2 cm could push the luminosity to 0.828×1033 cm-2s-1 at the working points 6.53/5.56. Also, the BEPCII synchrotron radiation mode is optimized to get a larger dynamic aperture and much more stable tunes.  
 
TUPMA014 State of the SLS Multi-bunch Feedback feedback, injection, kicker, storage-ring 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, storage-ring 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 storage-ring, 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.  
 
TUPMA022 Construction Progress of the SSRF Injector booster, linac, injection, synchrotron-radiation 133
 
  • D. M. Li, H. H. Li, Z. Q. Shen, M. H. Zhao, Z. Zhao
    SINAP, Shanghai
  SSRF (Shanghai Synchrotron Radiation Facility) is a 3rd generation synchrotron radiation source facility under construction. To meet the full energy top-up injection requirements of 3.5GeV storage ring, the injector of SSRF was designed which consists of a 150 MeV linac, a two super-periods 28 cells FODO type booster and two transfer lines (LT and HT). The cycle rate of booster is 1~2 Hz. SSRF was started building in the end of 2004, and the commissioning of accelerator part will be completed in April 2008 according to schedule. The Booster will start the commissioning until Oct 2007. Now most of on-line installing components, power supplies, and instruments are under manufacture or purchasing for SSRF booster. In this paper, the description of SSRF booster design, the progress of booster and transfer lines construction are described. Keywords: SSRF; booster; construction  
 
TUPMA023 Project of 2 GeV Synchroton Light Source for the Republic of Kazakhstan lattice, emittance, radiation, dipole 136
 
  • E. Antokhin, G. Kulipanov, N. A. Mezentsev, V. E. Panchenko, A. V. Philipchenko, A. V. Utkin, K. Zolotarev
    BINP SB RAS, Novosibirsk
  • K. K. Kadyrzhanov, S. N. Lyssukhin
    INP NNC RK, Almaty
  Applications of synchrotron radiation (SR) are very popular for last time in many research fields. Thus a developing of compact source for generation of hard X-ray synchrotron radiation is very actual task. The goal of this work is a developing project of SR source for Republic of Kazakhstan. This storage ring mainly dedicated for performing the high sensitive X-ray fluorescence analysis of different natural samples to be used for ore exploration, ore processing and metallurgy . But implementations of other popular techniques applied for research and education with using synchrotron radiation (XAFS, XRD, etc) are also possible. This report includes a detailed description of main parameters and magnetic structure of designed storage ring as well as preliminary design of injector system.  
 
TUPMA031 Development of Trigger and Clock Delay Module with Ultra-wide Range and High Precision laser, controls, electron, insertion 145
 
  • T. Ohshima, Y. Fukuyama, J. Kim
    JASRI/SPring-8, Hyogo-ken
  • E. Nonoshita, H. Sengoku
    Candox Systems Inc., Gyoda city, Saitama perfecture
  • Y. T. Tanaka
    RIKEN Spring-8 Harima, Hyogo
  Pump and probe experiments using pulse lasers and synchrotron radiation require precise timing relation between the laser pulse and the RF signal of the accelerator. The pulse laser needs clock signal for a mode-locked oscillator and trigger signal to a regenerative oscillator. The delay time of these two signals were usually adjusted by using a mechanical phase shifter or a cable delay. They have disadvantages of short tuning range or discontinuity in the clock signal. We developed a new delay module, which can continuously change the delay time with the range of ±1 s and the precision better than 5 ps. The key point of the module is combination of an IQ modulator and a synchronous counter. The IQ modulator can change the phase of the RF signal with infinite amount with high precision in both plus and minus direction, which is used to produce the laser clock. The phase-modulated RF signal is also fed to the synchronous counter and its output is used to the trigger of the regenerative oscillator. The effectiveness of this module was confirmed by an experiment carried out at the SPring-8. Detail composition of the module, its application and performance are described in the paper.  
 
TUPMA053 Injection Optimisation for INDUS-2 kicker, injection, optics, septum 184
 
  • A. A. Fakhri, G. Singh
    RRCAT, Indore (M. P.)
  In this paper commissioning experience of injection into INDUS-2, a 2.5 GeV synchrotron radiation source is discussed. In initial stage of commissioning, partial beam loss was observed. In this context effect of various injection errors such as mismatch between pulse widths, jitter and magnetic field stability of kickers on injected and stored beam are studied1. A brief summary of the results is presented. After reducing jitter and fine adjustments of timings of kicker power supplies, partial beam loss reduced significantly.  
 
TUPMA059 Beam Dynamics Effects with Insertion Devices for the Proposed 3 GeV Ring in Taiwan emittance, lattice, dipole, synchrotron-radiation 196
 
  • H. C. Chao, C.-C. Kuo
    NSRRC, Hsinchu
  • S.-Y. Lee
    IUCF, Bloomington, Indiana
  The effects of insertion devices on beam dynamics of storage rings were studied. We will focus on the changes of the emittance and energy spread in the presence of insertion devices. Formulas for the beam emittance and the energy spread with insertion devices are also derived, in which an intrinsic parameter depending on the design of the lattice is introduced in the calculations. Simulation results and comparisons of achromatic and non-achromatic cases in the proposed 3 GeV synchrotron radiation light source in Taiwan are shown.  
 
TUPMA099 Adiabatic Damping of the Bunch-length in the Induction Synchrotron acceleration, damping, induction, beam-losses 244
 
  • T. S. Dixit
    GUAS/AS, Ibaraki
  • Y. Shimosaki, K. Takayama
    KEK, Ibaraki
  A fact that a bunch-length shrinks with the barrier-bucket acceleration in the induction synchrotron [1], where a single proton-bunch injected from the 500 MeV Booster was accelerated to 6 GeV in the KEK-PS, has been observed [2]. This has been supposed to be simply explained by a term of adiabatic damping. A technique to analytically deal with such an adiabatic dumping in a case of RF bucket acceleration is well-known; a WKB solution is employed for the small amplitude synchrotron oscillation. However, the simple WKB approach is not available for the present barrier-bucket acceleration, because the longitudinal motion always depends on the oscillation amplitude. A novel technique capable of quantitatively predicting the adiabatic phenomenon in the barrier-bucket acceleration has been newly developed. It turns out that the experimental result, numerical simulation, and analytic prediction have been in good agreement with each other. Theoretical approaches tell us that a bunch-length in the barrier-bucket acceleration never continues to shrink but achieves a constant value corresponding to the time duration between barrier voltages.

[1] K. Takayama and J. Kishiro, Nucl. Inst. Meth. A451/1, 304-317 (2000)[2] K. Takayama et al., “Experimental Demonstration of the Induction Synchrotron”, published soon.

 
 
TUPMA102 Installation and Radiation Maintanance Scenario for J-PARC 50 GeV Synchrotron vacuum, extraction, septum, beam-losses 247
 
  • M. Yoshioka, T. Fujino, Y. Hori, K. Ishii, H. Kobayashi, T. Kubo, H. Matsumoto, H. Oki, T. Oogoe, Y. Saito, Y. Sato, M. Shimamoto, M. J. Shirakata, Y. Takeuchi, M. Uota, Y. Watanabe
    KEK, Ibaraki
  • M. HOSOKAWA
    THK CO., LTD, Hitachinaka
  • Y. Kuniyasu
    MELCO SC, Tsukuba
  Installation and assembling of accelerator components for J-PARC 50 GeV Synchrotron are now underway. Off-beam commissioning will be carried out between December 2007 and April 2008, and the full commissioning of J-PARC accelerator complex, which is consisted of an injector linac, a 3 GeV rapid cycling synchrotron and the 50 GeV Synchrotron, will be started from May 2008. This paper describes the status, schedule and method of installation and assembling of accelerator components. Radiation maintenance scenario will be also described.  
 
TUPMA111 Present Status of J-PARC MR Synchrotron extraction, septum, injection, power-supply 259
 
  • T. Koseki, H. Kobayashi, H. Matsumoto, M. Yoshioka
    KEK, Ibaraki
  The Japan Proton Accelerator Research Complex (J-PARC) is a joint project of High Energy Accelerator Research Organization (KEK) and Japan Atomic Energy Agency (JAEA). The J-PARC accelerator complex is composed of a 400 MeV proton linac, a 3 GeV Rapid-Cycling Synchrotron (RCS), and a 50 GeV Proton Synchrotron (MR). Installation of the MR which has two extraction sections, fast extraction for the Neutrino Facility and slow extraction for the Hadron Facility, is now underway. Test of injection and extraction components such as septum magnets and kicker magnets is progressed as well. Beam commissioning scenario is now being prepared. Maintenance scenario of activated components is also crucial in a high power proton accelerator. Beam commissioning will start in May 2008.  
 
WEZH101 Real Time Feedback on Beam Parameters feedback, controls, coupling, collider 295
 
  • R. J. Steinhagen
    CERN, Geneva
  Traditionally, tight beam parameter stability requirements were most pronounced for light sources and lepton colliders but became increasingly important for present and future hadron accelerator operation, not only for performance but also for reasons of machine protection, as recent improvements lead to significantly increased stored beam energies. In the latest generation machines the performance depends critically on the stability of the beam. In order to counteract disturbances due to magnetic imperfections, misalignments, ground motion, temperature changes and other dynamic effects, fully automated control of the key beam parameters –- orbit, tune, coupling, chromaticity and energy -– becomes an increasingly important aspect of accelerator operation. This contribution presents an overview of beam-based feedback systems, their architecture, performance limitations and design choices involved.

invited oral

 
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WEZMA01 Upgrades to the ISIS Spallation Neutron Source linac, target, proton, rfq 300
 
  • C. R. Prior
    STFC/RAL/ASTeC, Chilton, Didcot, Oxon
  With studies of a European Spallation Source (ESS) suspended and high-level discussions taking place over the future of neutrons in Europe, efforts are being made to ensure the sustained success of ISIS well into the foreseeable future. Recent developments include upgrading the injector by replacing the Cockcroft Walton with an RFQ, and installation of a new dual harmonic RF system that should eventually enable up to 50% more protons to be accelerated in the ring. A programme of ion source development also aims at improved reliability, enhanced beam current and longer life-time. This promise of more beam power has led to construction of a second target station providing users with additional experimental facilities starting in October 2008. In the longer term, ideas are forming either for a new high intensity proton driver or for a phased development of ISIS to the 5MW level. As an alternative to generating neutrons, such a machine might also be part of a neutrino factory, a complex of accelerators generating neutrinos from muon decay. This paper describes these activities and identifies their relative importance on an international development scale.  
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WEPMA013 Analysis and Correction of the Measured COD in INDUS-2 quadrupole, closed-orbit, injection, betatron 351
 
  • R. Husain, A. D. Ghodke, G. Singh
    RRCAT, Indore (M. P.)
  In Indus-2 there are 56 button type beam position monitors (BPMs), 48 horizontal and 40 vertical steering magnets. The measured orbit has been fitted by effective quadrupole misalignments by using SVD of the response matrix generated between BPMs and the quadrupole misalignments in the model obtained by setting the magnet strengths as per the current set in the magnets. We present the different global and local orbit correction algorithms developed for minimizing and controlling the orbit. The preliminary result for the orbit correction, at injection energy, in horizontal plane using best orbit correctors identified by doing SVD of the response matrix is presented. The results for the local four orbit bumps are also presented.  
 
WEPMA038 A Study on the Applicability of Landau Cavity to the 1.2 GeV Booster Synchrotron at Tohoku University impedance, injection, booster, target 375
 
  • F. Hinode, K. Akiyama, K. Kasamsook, M. Kawai, A. Kurihara, T. Muto, K. Nanbu, Y. Shibasaki, S. Takahashi, T. Tanaka, M. Yasuda
    Tohoku University, School of Scinece, Sendai
  In these years, a 1.2 GeV Stretcher-Booster (STB) ring at Laboratory of Nuclear Science, Tohoku University, has been mainly operated in the booster-storage mode in which the high energy gamma-ray beam generated via bremsstrahlung from internal target wire has been utilized for experiments of nuclear physics. Beam energy injected from linac is not high enough (150 or 200 MeV), so that radiation damping time is much long. Although the injector linac provides sufficient beam current without beam stacking, circulating beam current decays rapidly due to instabilities before the beam reaches the top energy. One of the main causes in the beam current limitation is supposed to be strong coupled bunch instability due to the cavity HOM. In order to suppress the instability, applicability of a third-harmonic Landau cavity has been studied for the STB. The 1.5 GHz Landau cavity was already manufactured and installed in the ring. Beam commissioning will be started soon. We are also planning to introduce a longitudinal feedback into the STB. We will report the present status of the STB in this conference.  
 
WEPMA049 Design of a Stripline Kicker for Tune Measurement in SESAME Storage Ring storage-ring, impedance, betatron, 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.  
 
WEPMA051 Development of Wide Band FCT System for Booster Synchrotron of Indus-1 & 2 pick-up, booster, coupling, impedance 396
 
  • P. Pareek, R. S. Shinde, K. Singh
    RRCAT, Indore (M. P.)
  A high precision & non-destructive type of wide band FCT for the measurements of electron current has been developed. This monitoring system is composed of slow & fast FCTs, NiZnCo ferrite toroidal cores, pick up coils, electromagnetic shields & pulse amplifiers. A wide band FCT (rise time 60 ns & decay 1 ms) required for measurement of Electron beam intensity & turn-to-turn observation & stored current accumulation during 1 us pulse injection into Booster Synchrotron. Single FCT can't measure e beam current & turn-by-turn observation from 60 ns to 1 ms. Therefore, we designed & developed two FCTs housed in a single box. The spacing between them is optimized so that coupling between them will not affect pulse shape. The FCT consists of two NiZn ferrite ring cores separable into two pieces for easy setting around ceramic beam duct. A beam intensity of pulse (100 ns ~1 us) beam is monitored by fast rise Current monitor (~ 60 ns)& turn/stored currents monitored by slow FCT (~ 1 us to 1 ms). A wide band FCT showed fast rise & slow decay, high sensitivity (0.050V/mA), linearity within 1 % & good S/N ratio. This paper focuses on FCT designs, construction & their pulse response  
 
WEPMA058 Tune and Lifetime Studies at the Australian Synchrotron quadrupole, sextupole, kicker, injection 401
 
  • M. J. Spencer, M. J. Boland, R. T. Dowd, G. LeBlanc, Y. E. Tan
    ASP, Clayton, Victoria
  The 3GeV Australian Synchrotron will begin operation in March 2007. This paper outlines the tune and lifetime measurement systems. It also provides a summary of a number of studies completed using these systems. Three different tune measurement systems have been tested. Lifetime measurements made using the DCCT were used to optimise the strengths of the harmonic sextupoles and the location of the tunes. The vertical aperture was determined using scrapers. Beta-function measurements have been completed by shunting individual quadrupoles and noting the resultant tune changes. Chromaticity measurements have been made by observing the change in tune as the RF frequency is varied.  
 
WEPMA059 Commissioning of the Australian Synchrotron with Libera EBPPs and Matlab controls, quadrupole, lattice, storage-ring 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, storage-ring, 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, storage-ring, 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, storage-ring, 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.  
 
WEPMA070 Control of the Multi-Bunch Instabilities at TLS feedback, kicker, controls, synchrotron-radiation 419
 
  • C. H. Kuo, J. Chen, K. T. Hsu, S. Y. Hsu, K. H. Hu, D. Lee
    NSRRC, Hsinchu
  To increase stored beam current and provide stable beam for users, RF is upgraded to superconducting and top-up mode injection is operated recently at the TLS. To take advantage of these upgrade, suppress multi-bunch instabilities due to resistive wall of the vacuum chamber, cavity-like structures and ions related instability are essential. FPGA based transverse bunch-by-bunch feedback system and longitudinal feedback system was deployed. Multi-bunch instabilities was successfully suppressed when stored beam current is more than 400 mA. Lower chromaticity operation is possible with the help of transverse feedback system that is essential for injection efficiency improvement in top-up operation mode. Status of the feedback systems and analysis of the behavior of multi-bunch instability will be presented.  
 
WEPMA077 Monitor and Archive System of Instrumentation controls, monitoring, instrumentation, cryogenics 431
 
  • Z.-D. Tsai, J.-C. Chang, Y.-H. Liu, T.-S. Ueng
    NSRRC, Hsinchu
  • J.-R. Chen
    NTHU, Hsinchu
  In the accelerator field, the instrumentation includes the vacuum, magnet, RF, utility, cryogenic, power, safety, optic device and so on. The highly complicate systems have many hybrid SCADA systems to ensure precise and optimum control. For the historical data integration and analysis of those signals, the monitor and archive system is introduced to provide a distributed multi-channel acquisition platform. The system possesses various connectivity of open database, communication protocols and commercial hardware. The signal data can be collected and delivered to the central Storage Area Network (SAN) via fiber network without latency. Finally, the unique, friendly and fast trend logger and data analysis software are also developed to view, compare, and analyze relation between facility at any time and anywhere.  
 
WEPMA086 First Experiences with Central Web Based Fault Information System controls, radiation, synchrotron-radiation, power-supply 446
 
  • B. S. Srivastava, P. Fatnani
    RRCAT, Indore (M. P.)
  Indus Control System operating the Indus-1 and Indus-2 Synchrotron Radiation Sources facilities at RRCAT, Indore is a widely distributed system. It employs, for Indus-1 8 VME Controllers, 300 interface modules, 7 Operator Computers and for Indus-2 approximately 100 Layer-3 VME stations, 10 Layer-2 Supervisory Controllers, 11 Operator Computers and 6 Server Machines. The whole control system is being operated in shifts to provide synchrotron radiation from Indus-1 to users as well as carrying out commissioning experiments of Indus-2. To keep it up and running the faults encountered during its operation are rectified at site and complete observations and rectifications of the faults are recorded electronically by the shift crewmembers in a central web based fault information system. This System is based on three tiers software architecture and has been developed using Java Servlets, HTML, JavaScript and SQL Database. Using relational database, facilities have been provided by the system for logging, e-mailing, acknowledging, exploring and analyzing the faults of various sub systems. This paper briefly describes experience implementations and functionalities provided by the system.  
 
WEPMA099 A New, PXI Bus Based, Pattern Memory System for the Siam Photon Source. power-supply, booster, controls, photon 461
 
  • G. G. Hoyes
    NSRC, Nakhon Ratchasima
  A new pattern memory system has been built from PXI bus modules to ramp the booster synchrotron magnet and RF power supplies, replacing an old and proprietary Toshiba system. The new system is compact, rugged, easy to program using LabVIEW, easy to repair and low cost.  
 
THYMA03 Commissioning Experience of Superconducting Radio Frequency Systems for the Taiwan Light Source cryogenics, vacuum, feedback, photon 549
 
  • Ch. Wang, L.-H. Chang, M. H. Chang, S.-S. Chang, F.-T. Chung, F. Z. Hsiao, M.-C. Lin, Y.-H. Lin, M. H. Tsai, T.-T. Yang, M.-S. Yeh
    NSRRC, Hsinchu
  An industrially manufactured CESR-type SRF module has been routinely operated at the Taiwan Light Source (TLS) at the National Synchrotron Radiation Research Center (NSRRC) since the beginning of March 2005. The original goals of doubling the electron beam current to increase the synchrotron light intensity and of eliminating the instability caused by the interaction of the electron beams with the cavity's higher-order modes have been successfully demonstrated. The greatest challenge to the operational reliability is the shortness of the mean time between failures, and has been successfully overcome. This work reports the commissioning experience of the SRF module at TLS for high beam-current operation toward a maximum beam current of 400 mA in top-up mode from 200 mA in decay mode over last two years. Emphasized will be the instrument development for analysis of SRF trip event and the continuous improvements of the operating analogous low-level rf system against instability of feed back loops caused by heavy beam loading.  
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THZMA02 Status of the Australian Synrotron project storage-ring, injection, booster, 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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THZMA04 Status and Future of Taiwan Light Source injection, emittance, storage-ring, feedback 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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THZH101 Review of Hadron Machines for Cancer Therapy proton, ion, cyclotron, linac 573
 
  • M. Kanazawa
    NIRS, Chiba-shi
  Charged particle therapy is now taking a long step from research stage to routine treatment. Highly reliable and sophisticated systems are required at reasonable cost. There are about two dozens of therapy accelerators working in the world. Besides the proton beams, carbon beam is being watched with keen interest because of its excellent clinical effects in cancer treatments. Accelerators which deliver heavy charged particles for cancer therapy will be reviewed.  
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THC3MA01 Operation and Recent Developments at the Siam Photon Source photon, storage-ring, 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, storage-ring 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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THPMA045 Analysis and Design of Parallel Resonant Network Power Supply for a Rapid Cycling Synchrotron power-supply, proton, quadrupole, target 685
 
  • S. R. Tiwari, M. Borage, K. Swarna
    RRCAT, Indore (M. P.)
  Rapid Cycling Synchrotron (RCS) requires dc biased sinusoidal excitation for electromagnets. Power supplies based on resonant schemes are best suited for such applications, as only the losses of the resonant network are drawn from the mains and the magnets are energized by resonating its inductance with external energy storage elements. In this paper study of various options for powering the magnets and its excitation source is carried out. Optimization of network elements for parallel resonant network with respect to the operating and investment cost is carried out. Tolerance analysis of a high-Q resonant network with respect to variation in component values and its effect on amplitude and phase of magnet current, and the ac component reflected in the magnet current due to presence of ac and dc input source ripple is documented in detail. Design of a parallel , continuous ac excited resonant network for the QF2 magnet for the proposed 1 GeV Rapid Cycling Synchrotron is presented.  
 
THPMA046 Study and Comparison of Reactive Power Compensation Schemes for Air-Core Transformer in ELV-type DC Accelerators simulation, electron, vacuum, impedance 688
 
  • M. Borage, S. Kotaiah, S. R. Tiwari
    RRCAT, Indore (M. P.)
  The ELV-type electron accelerators are widely used in industrial and research applications. The scheme for generating high voltage in these machines is based on air-core transformer, which has large leakage inductance and small magnetizing inductance. To minimize the reactive power loading on the inverter feeding the primary winding, suitable compensation scheme must be employed. Conventional compensation scheme using shunt capacitor and a series inductor however can minimize the reactive power only at one particular loading condition. Also the compensating inductor becomes heavy and bulky. In this paper, the results of studies done to investigate suitability of various compensation networks are presented. Following desirable features are looked for: (1) Near-unity power factor operation under all loading conditions. (2) Nearly load independent output voltage. (3) Minimum additional reactive components. (4) Elimination of compensating inductor. Characteristics of compensation networks are studied and compared using simulation software PSpice wherein with the proposed method, normalized results suitable for comparison are directly obtained.  
 
THPMA056 Design of the TPS Bending Chamber vacuum, storage-ring, 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, storage-ring, photon, radiation 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

 
 
THPMA061 Numerical study of field errors due to mechanical tolerances in superconducting miniundulators simulation, undulator, linac, microtron 711
 
  • C. Diao, H. O. Moser
    SSLS, Singapore
  Based on a wire model, analytical formulae are derived to describe the spatial distribution of the magnetic field as determined by the parameters of the undulator including positional and orientational errors. Semi-analytical numerical simulations are performed to estimate the tolerance of the errors required for a satisfactory function of the supramini, including the effects of systematic errors (pitch, yaw and roll errors) and random errors of the wire position. The effects of these errors on the quality of the field are then graphically analyzed to show the RMS spread of the functions.  
 
THPMA062 An APPLE-II Type Helical Undulator for SSRF undulator, polarization, electron, radiation 714
 
  • Q. G. Zhou, M. Zhang
    SINAP, Shanghai
  Shanghai Synchrotron Radiation Facility (SSRF) is an intermediate energy (3.5GeV) light source under construction. Specially designed insertion devices will be required to realize the high brightness photon beams made possible by the low emittance electron beam. The first insertion device to be designed is a 4.2m long, 10cm period, APPLE-II type helical undulator, U10.0. The U10.0 will use a permanent magnetic configuration corresponding to four standard Halbach-type magnet rows which consist of two pairs of planar permanent magnet rows above and below the electron orbit plane. The C-frame support structure is selected. The design of U10.0, including magnetic structure, backing beams, support structures and drive systems, is described  
 
THPMA081 Precise Positioning of Magnetic Field Centers of Quadrupole Magnets on the Girder quadrupole, laser, alignment, target 749
 
  • L. Tsai, T.-C. Fan, S. Y. Perng, D.-J. Wang
    NSRRC, Hsinchu
  Conventional alignment of quadrupole magnet on the girder is mainly based on the measurement of theodolite and fiducial. Most of the measurement errors come from human-eye resolution and fiducial precision. The resultant cumulative error could be in the order of 50~100μm. In this paper, pulsed wire method is proposed to align group of quadrupole magnets concentrically on one girder to precision about 10μm. In order to increase the alignment accuracy, sag problem in tension wire is replaced by a short wire with laser PSD system. Descriptions of the setup and test results are presented.

quadrupole magnet alignmentpsd

 
 
THPMA091 Air Temperature Analysis and Control Improvement for the Injection Area at TLS controls, injection, booster, linac 773
 
  • J.-C. Chang, Y.-H. Liu, Z.-D. Tsai
    NSRRC, Hsinchu
  This paper presents the air temperature analysis and control improvement for the injection area at the Taiwan Light Source (TLS). The injector consists of a 50-MeV LINAC and a 1.5-GeV booster synchrotron. Because of insufficient cooling capacity, the air temperature was too high ( > 27 degree C ) and the temporal temperature variation was more than 2 degree C in one day. The air relative humidity was often higher than 60%. The problem of insufficient cooling capacity became more serious after the top-up mode operation. To cope with the abovementioned thermal problem, the cooling capacity was increased and the PID parameter of the temperature control was also optimized. Totally 18 temperature sensors were distributed in this area to on-line record the air temperature history. The temperature control was improved to suppress temporal temperature variation within ± 0.1 degree C. The thermal uniformity was also much improved than ever.  
 
THPMA093 Vibration Evaluation for Utility Instruments and Water Piping System in TLS storage-ring, vacuum, quadrupole, controls 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.  
 
THPMA096 Installation and Integration of Indus-2 dipole, vacuum, radiation, multipole 782
 
  • S. Chouksey, S. Kotaiah, S. S. Prabhu, V. Prasad, R. Ramasubramanian, S. K. Shukla, D. P. Yadav
    RRCAT, Indore (M. P.)
  The Synchrotron Radiation Sources consist of a large number of components of varying nature. Some components are light but highly delicate whereas some are big and heavy. However all components need a careful handling during their installation. Unit-cell mock-up assembly and virtual simulation of the installation process using software tools contributed significantly in visualizing various handling schemes, checking interferences and defining the assembly sequence. We have recently completed the installation and integration of 2.5 GeV Synchrotron Radiation Source, Indus-2, by adopting a set procedure of installation and pre-defined sequence. This paper presents, an overview of procedures, sequence of assembly, equipments and toolings used for material handling and safety precautions taken during the whole task of installation and assembly.  
 
THPMA104 RF activities of ACCEL Instruments in Asia-Pacific linac, booster, site, proton 791
 
  • M. Pekeler, K. Dunkel, M. Peiniger, C. Piel, H. Vogel, P. vom Stein
    ACCEL, Bergisch Gladbach
  Since the foundation of ACCEL Instruments, Asia-Pacific has been an important market for RF, magnet and x-ray beam line devices. For the RF activities, pioneering work was done for JAERI, where complete superconducting rf modules where designed, built, tested and delivered. An important step for industrialisation of superconducting rf modules was done, when NSRRC decided in 2000 as the first Light Source, to contract turn key superconducting 500 MHz modules of the Cornell design to ACCEL. Similar modules have been delivered in the meantime to CLS, Cornell and DLS and three more will be delivered to SSRF in Shanghai next year. Peking University is planning to use a Rossendorf design superconducting rf module housing two 1.3 GHz TESLA cavities for the operation of their FEL project. On the normalconducting rf systems, a complete 3 GHz, 100 MeV linac has been delivered to ASP together with the 500 MHz booster cavities and the LLRF system. Booster cavities and LLRF system will be also delivered for SSRF. For SOREQ in Israel, ACCEL is developing a complete superconducting 40 MeV proton/detueron linac. The first stage of this linac is currently under delivery and installation.  
 
THPMA111 Target Assembly Design and Neutronics Study for Indian Spallation Neutron Source Using NMTC/JAM Code target, proton, injection, ion 797
 
  • V. K. Senecha, M. Kawai
    KEK, Ibaraki
  Target-moderator-reflector assembly (TMRA) design studies for the best neutronics performance of the proposed Indian Spallation Neutron Source(ISNS) have been carried out using high energy particle transport code NMTC/JAM. The issues relevant for TMRA design like selection of target material, effect of target shape and dimensions and placement of moderator, suitable material for reflector its size have been addressed using the code calculations. NMTC/JAM code calculations have shown that the neutron yield per proton for thick Pb target for varying target lengths are in good agreement within the error limit with the results reported by experimental group and matching with the results of JAERI code calculations (JAERI 'Data/code 2001-07). Different geometrical configurations for TMRA were attempted and resulted tally's for track-length, surface crossing, nuclide yield, heat deposition, and time tallies for the neutron have been calculated. It has been observed that wing type structure of moderator position with respect to the target is suitable for optimum neutron yield in the pulsed mode.

(1) NMTC/JAM, JAERI code 2001-007, Koji Niita et al.(2001).(2)Development of target for KENS, M. Kawai et al. Procd. 2nd Workshop on Materials Tech. for spallation neutron source,141(2001).

 
 
THPMA117 Design and Fabrication of Arups U6 Undulator at PLS undulator, controls, insertion, insertion-device 806
 
  • H.-G. Lee, C. W. Chung, H. S. Han, Y. G. Jung, D. E. Kim, W. W. Lee, K.-H. Park, H. S. Suh
    PAL, Pohang, Kyungbuk
  Pohang Accelerator Laboratory(PAL) had developed and installed an U6 undulator recently to utilize brilliant undulator radiation for ARUPS (Angle Resolved Ultraviolet Photoemission) beamline at Pohang Light Source (PLS). The U6 is a hybrid type device with period of 6 cm, minimum gap of 18 mm, maximum flux density of 0.85 Tesla and total magnetic structure length of 1830 mm. The support locations and structure of an insertion device are optimized to achieve a minimum deflection due to the magnetic loads. A Finite Element Analysis (FEA) is performed to find out the amount of maximum deflection and optimal support positions on the backing beam. The optimized maximu deflection is estimated to be about 11.6 ?, while the deflection before any optimization is 48.8 ?. In this report, all the mechanical design, fabrication and assembly details of the PLS U6 undulator are described.