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Paper Title Other Keywords Page
MOOPMA01 Challenges in ILC SCRF Technology superconductivity, linear-collider, monitoring, coupling 26
 
  • D. Reschke
    DESY, Hamburg
  With a baseline operating gradient of 31,5 MV/m at a Q-value of 1·1010 the superconducting nine-cell cavities for the ILC are a challenging milestone for SRF technologie. Worldwide intensive ILC R&D programs are underway or in the planning stage in the all three regions of America, Asia and Europe. This paper will give an overview of the main activities in superconducting RF (SRF) technology.  
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MOOPMA02 Overview of Regional Infrastructure for SCRF Development collider, linac, linear-collider, cryogenics 31
 
  • C. Pagani
    INFN/LASA, Segrate (MI)
  The unanimous ICFA decision to choose the TESLA “cold” technology as the basis for the International Linear Collider, ILC, gave a global impulse to the superconducting RF, SCRF, technology. The perspective of building large accelerators based on high gradient superconducting cavities poses a number of new problems in term of performance reproducibility, large scale manufacturing and cost containment. In parallel with the ongoing R&D on basics in labs and universities, new large regional SCRF infrastructures are being developed to qualify treatment, assembly procedures and ancillary integration in performing cryomodules. US at Fermilab and Asia at KEK are strongly investing in these facilities and also Europe is considering duplicating and adjourning at CERN the operational facility set up at DESY by the TESLA Collaboration. In this paper the ongoing global effort on SCRF through the development of large regional infrastructures is outlined together with their status and plans.  
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TUC2MA02 Design of the Transfer Lin·10-2 for the CTF-3 at CERN quadrupole, dipole, sextupole, lattice 71
 
  • A. Sharma, A. D. Ghodke, A. Rahim, G. Singh
    RRCAT, Indore (M. P.)
  The design of the Transfer Lin·10-2 (TL-2), which will transfer an electron beam from the Combiner Ring (CR) to CLEX area (CLIC experimental area) of CTF-3 at CERN, is presented in this paper. This line will be used to control the bunch length and Twiss parameters at the entrance to the CLEX area. The line will have a wide tunability of R56 parameter, ranging from –0.35 to +0.35m. This has been designed considering the constraints imposed by the building geometry and the magnetic elements to be used. The design optimization of the line has been done up to second order for the entire R56 range, keeping T566 practically zero and emittance dilution below 10%.  
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TUZMA02 Operation for LHC Cryomagnet Tests: Concerns, Challenges & Successful Collaboration cryogenics, dipole, superconducting-magnet, target 84
 
  • V. Chohan
    CERN, Geneva
  The LHC construction phase is coming to a close with installation work progressing rapidly and beam start-up foreseen by end 2007. For the testing of the 1706 LHC cryo-magnets in cryogenic conditions and its successful completion by early 2007,considerable challenges had to be overcome since 2002 to assure certain semi-routine tests operation at CERN. In particular, the majority of staff for tests and measurement purposes was provided by India on a rotating,one-year-stay basis, as part of the CERN-India Collaboration for LHC. This was complemented by some CERN accelerator Operation staff. While only 95 dipoles were tested till 2003, the efforts and innovative ideas coming from the operation team contributed significantly to the completion of tests of nearly all 1706 magnets by end-2006. Amongst these, certain pivotal ideas to stream-line the tests methodology as proposed and implemented successfully by the Indian Associates deserve a special mention. An insight into this as well an overall view of the tests operation will be given, together with an indication of some of the operation-related results from the tests programme.  
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TUPMA001 New Connection Cryostat to Insert FP420 Proton Tagging Detector in the LHC Ring proton, cryogenics, vacuum, alignment 103
 
  • S. M. Pattalwar
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
  • T. Colombet, S. Marque, T. Renaglia, D. K. Swoboda
    CERN, Geneva
  • B. Cox, K. M. Potter, F. Roncarolo
    UMAN, Manchester
  • D. Domenico
    INFN-Torino, Torino
  FP420 is a R&D project to assess the feasibility of installing proton tagging detectors in the region 420m from the interaction points at the LHC. They would function as new sub-detectors at ATLAS/CMS, allowing the measurement of the spatial position and arrival time of outgoing protons emerging almost intact from the collision. Forward proton tagging in this region is expected to open a new programme of electroweak, QCD and BSM physics. At present the 420m region is enclosed in a 'connection cryostat' (maintained at 1.9K) that provides continuity for the LHC beam, cryogenic & vacuum services and electrical power circuits through superconducting bus bars. The requirement of near room temperature operation and critical position control close to the beam pipes has made inserting FP420 detectors in this region a very complex task. The currently favoured design calls for the replacement of the connection cryostats with a new ~12m long assembly that will have all the necessary features of the existing connections cryostat as well as the appropriate environment for the operation of the detectors. This paper mainly describes the cryogenic aspects of the new connection cryostat.  
 
TUPMA008 Status of the VEPP-4M Electron-Positron Collider monitoring, lepton, luminosity, collider 112
 
  • V. V. Petrov
    BINP SB RAS, Novosibirsk
  Since 2004, the principal high-energy physics experiment carried out at the VEPP-4M electron-positron collider is precise measurement of the tau-lepton mass. Moreover, a series of experiments to improve measurement accuracy of the J/psi, psi(2s) and psi(3770) mesons has been performed. During all the high-energy physics experiments, absolute calibrations of beam energy by the resonant depolarization method and routine energy monitoring using the Compton back-scattering technique were realized. Monitoring of beam energy spread, which is also important, was implemented using several techniques. To provide the VEPP-4M high performance, some investigation and further development of the machine have been done, the most important results are described.  
 
TUPMA020 Beam Based Alignment and COD Correction for the Siam Photon Source quadrupole, photon, alignment, betatron 130
 
  • S. Rugmai, S. Rugmai
    Suranaree University of Technology, Nakhon Ratchasima
  • P. Klysubun, C. Kwankasem, P. Sudmuang
    NSRC, Nakhon Ratchasima
  The first systematic Beam based Alignment (BBA) and COD correction attempt for the Siam Photon Source has been performed. Automated measurements were carried out using MATLAB OPC Toolbox, interfacing to the PLCs of the accelerator control system. Calculations of theoretical parameters were performed with Accelerator Toolbox via MATLAB interface. Since the Beam Position Monitors (BPMs) were not properly calibrated prior to installation beam based calibrations were carried out. Preliminary calibration factors for each BPM were obtained by normalizing BPM signals to modeled steering magnet responses. Measurements of offsets between BPM and quadrupole centers were performed by fitting for minima of orbit response to changes of quadrupole strengths. The resulting offsets were superimposed to the BPM readings in the PLC. COD correction was then performed.  
 
TUPMA026 A Prototype of the SSRF Power Supply Control System power-supply, storage-ring, 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.  
 
TUPMA031 Development of Trigger and Clock Delay Module with Ultra-wide Range and High Precision laser, synchrotron, 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.  
 
TUPMA032 Radiation Safety System for INDUS Accelerator Complex radiation, monitoring, booster, microtron 148
 
  • R. G. Marathe, V. Bhatnagar, P. Fatnani, R. K. Gupta, G. Singh, D. S. Thakur, thakkar,k.k. thakkar
    RRCAT, Indore (M. P.)
  Indus Accelerator Complex consists of a 450 MeV electron storage ring Indus'1 and 550-2500 MeV booster-cum-storage ring Indus-2, which is under commissioning. A common injector system that feeds these rings consists of a 20 MeV microtron & a 450-600 MeV booster synchrotron. Hazardous ionizing radiation is emitted from the accelerators of a facility like Indus. Therefore, it is mandatory to install a Radiation Safety System (RSS) at such a facility. The essential constituents of such a RSS are:·Shielding structure for protecting the personnel from ionising radiation;·Detection and monitoring of the radiation levels inside & outside the shielded area;·Protection system for ensuring that nobody is inside the shielded area when the facility is in operation. The radiation safety system was set-up in stages. The RSS for microtron and booster synchrotron was set-up first followed by that for Indus-1 ring. For Indus-2, it was commissioned in July 2005. These systems were then integrated and have been performing as intended. This paper presents the integrated radiation safety system of Indus Accelerator Complex with emphasis to important features of Indus-2 RSS.  
 
TUPMA035 SCSS Prototype Accelerator Timing System electron, acceleration, gun, klystron 154
 
  • N. Hosoda, T. Ohata, T. Ohshima
    JASRI/SPring-8, Hyogo-ken
  • H. Maesaka, Y. Otake
    RIKEN Spring-8 Harima, Hyogo
  SPring-8 Compact SASE-FEL Source (SCSS) project is in progress. To verify its feasibility, the 250MeV SCSS prototype accelerator (SPA) was constructed and beam commissioning started in October 2005. We observed first lazing of 49nm wave length in June 2006. In this paper, we describe the timing system of SPA. The target time jitter was selected under 1ps. To achieve this, A master trigger generator unit (MTU), a master trigger distribution unit, a 5712MHz synchronous trigger delay unit (TDU) and a level converter unit were newly developed. The MTU generates a 1-120Hz master trigger to drive all accelerator components synchronously from 60Hz AC line and 238MHz RF. The TDU is an 8ch 24bit delay counter to generate required timing signals for each component using the master trigger from the MTU. The TDU uses 238MHz RF as a counter clock and uses 5712MHz RF to recover the circuit jitter and to synchronize to the electron beam. The time jitter of 0.71ps in the TDU was achieved. We measured the time jitter between an electron beam and a 5712MHz RF that is a main acceleration RF frequency, and obtained 0.34ps. This demonstrates good stability of SPA.  
 
TUPMA109 Thermal-Induced Frequency Detuning of 350 MHz RFQ Structure rfq, linac, proton, injection 256
 
  • N. K. Sharma, S. C. Joshi, N. K. Sharma
    RRCAT, Indore (M. P.)
  A 350 MHz, 4.5 MeV RFQ structure is being studied for proposed High Power Proton Linac for Indian SNS. At high RF duty operation of RFQ due to RF induced heating the structure would be subjected to thermal deformations and hence the detuning of resonating structure from its designed resonating frequency. A detailed Thermal-Structural-Electromagnetic sequential analysis of RFQ has been performed using Multi-physics ANSYS (Finite Element Analysis Software). A cooling scheme has been worked out to get the efficient heat removal from the structure to minimize the thermal induced frequency shift. During analysis the parameters such as cooling water flow rate, cooling water inlet temperatures, cooling channel locations, cavity thickness etc. are varied to study the effect of these parameters on temperature distribution and associated frequency variation. The frequency shift is found highly sensitive to vane tip cooling parameters.  
 
WEYMA02 India-based Neutrino Observatory - Present Status simulation, site, electron, target 290
 
  • V. M. Datar
    BARC, Mumbai
  The current status of the India based Neutrino Observatory (INO) project is summarized. The two major physics goals are (a) unambiguous demonstration of neutrino oscillation and a more precise measurement of the associated neutrino parameters and (b) to search for matter effects in neutrino oscillation, using the charge identification capability of the magnetized iron calorimeter, which would help determine the signs of one pair of mass differences. The status of the 1 m3 prototype iron calorimetric detector, the design of the 50 kton magnet, the experience with resistive plate chambers used for tracking the charged particles produced in neutrino-iron interactions and the planned electronics and data acquisition system will be presented.  
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WEZH101 Real Time Feedback on Beam Parameters feedback, coupling, synchrotron, 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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WEZMA04 Superconducting Cyclotron Project at VECC cyclotron, extraction, injection, cryogenics 320
 
  • R. K. Bhandari
    DAE/VECC, Calcutta
  Construction of the K-500 superconducting cyclotron at Kolkata is now in final stages. The main magnet was operated satisfactorily for alomost one year during 2005. The coil was continuously kept cooled at 4.2K temperature during the entire period. Extensive magnetic field measuremens were done for correction of the imperfections, centering of the main coil, calculation of operational settings, calculation of extraction trajectory etc. Subsequently in April 2006 the coil has been warmed up to facilitate assembly of the other systems of the machine. All major systems have been fabricated and the assembly is currently going on. We plan to start the commissioning tests in the first half of year 2007. In this paper our experience with the operation of the main superconducting magnet and magnetic field measurements will be discussed. Developmental highlights of various systems will be briefly presented.  
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WEC3H101 Multi-bunch Feedback Activities at Photon Factory Advanced Ring feedback, kicker, injection, betatron 330
 
  • W. X. Cheng, T. Obina
    KEK, Ibaraki
  The photon factory advanced ring (PF-AR) is a dedicated single bunch light source at KEK, however, some users require multi-bunch operation for high intensity x-ray beams. The old transverse damping system can suppress only one (or two) bunches, while new multi-bunch feedback system has been successfully tested to a maximum of 64 bunches. Both analog and digital transverse feedback loop has been tested at AR to store multi-bunches. Long cables are used to delay the bunch position error signal from BPM buttons for analog feedback control loop. Betatron phase advance between stripline kicker and BPM are selected to be around 90 deg. For digital feedback loop, it based on a FPGA test board. Bunch position error signal sampled by ADC, filtered by 10-tap FIR filter implemented in FPGA and send to DAC output for correction. FIR filter is well designed to increase the system dynamic range. Digital delay can also be implemented inside FPGA instead of long cable delays. Maximum beam current of 97mA has been achieved for several bunches’ storage, betatron oscillation of the stored beam can be suppressed well.  
 
WEPMA002 A Large Area Scanning Magnet For Homogeneous Irradiation of Targets power-supply, impedance, dipole, ion 339
 
  • A. Mandal, R. Kumar, G. Rodrigues, S. K. Suman
    IUAC, New Delhi
  The scanner is an important tool for accelerator based material science research. For high energy (~100 MeV) ion beam scanner has to be magnetic one. Major problem faced with magnetic scanner is its high inductance which causes large impedance to the a.c. power supply used to energise the magnet. We have designed a magnetic scanner keeping attention to minimise its inductance. The scanner is composed of two independent H-type dipole magnets which are fed by saw tooth pulses. It can scan over an area of 25 mm x 25mm at a distance of 1 metre. The power supplies for this scanner have also been designed. These are bipolar, wideband, high speed amplifirs that can reproduce complex waveform without any distotion. The ratings are 60V, 50A operating at 50Hz for x-scanner and 5V,70A at 0.2Hz for y-scanner. Design and performance of the scanner magnet and power supplies will be presented.  
 
WEPMA010 8 GeV Beam Line Optics Optimization for the Rapid Antiproton Transfers at Fermilab antiproton, lattice, optics, proton 345
 
  • V. P. Nagaslaev, V. A. Lebedev, J. P. Morgan, D. Vander Meulen
    Fermilab, Batavia, Illinois
  Tevatron Run-II upgrade requires a significant increase of the efficiency and speed of the antiproton transfers from the Accumulator to the Recycler. This goal represents a great challenge as the time between stopping and initiating the stacking regime should change from 1 hour down to a few minutes. Here we discuss the beam line optics aspects of this project. Results of lattice measurements and optimization are analyzed in terms of transport efficiency and stability.  
 
WEPMA050 BPM (Beam Position Monitor) in the PAL Linac and BTL linac, feedback, electron, pick-up 393
 
  • S.-C. Kim, J. Choi, Y. J. Han, J. Y. Huang, D. T. Kim, W. W. Lee, H. J. Park
    PAL, Pohang, Kyungbuk
  In Aug. 2004, thirteen BPMs are installed at BTL (Beam Transport Line), and later in Aug. 2005, three BPM installed at main linac for beam trajectory measurement and feedback. BPMs for the BTL consist of 100mm strip-line electrodes in 150mm long chamber and uses SMA-R type feed-throughs. BPMs of the Linac consist of 57mm strip-line electrodes in 100mm short chamber and SMA-R type feed-throughs. 500MHz log-ratio signal processing circuits are used for the Linac and BTL BPM electronics. BPM data acquisition system is developed as an EPICS IOC by using NI S-series DAQ board and NI LabView 7.1. Best read-out accuracy of BPM system is measured as 20mm including BPM electronics. In this paper, we describe on the status of the BPM and its characteristics for PAL Linac and BTL.  
 
WEPMA054 Photon Beam Position Monitor with Hydraulic Level System storage-ring, photon, diagnostics, feedback 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, 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.  
 
WEPMA070 Control of the Multi-Bunch Instabilities at TLS feedback, kicker, synchrotron, 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.  
 
WEPMA071 The Design, Fabrication and Performance Testing of the Analog I/Q RF Control System at NSRRC feedback, klystron, booster, linac 422
 
  • M.-S. Yeh, L.-H. Chang, F.-T. Chung, Y.-H. Lin, Ch. Wang
    NSRRC, Hsinchu
  An analog low-level RF system, based on an I/Q modulator and demodulator, has been tested at NSRRC. The I/Q RF control system has the same function blocks as the digital low-level RF system, which we plan to develop for our proposed 3-GeV light source machine. This analog I/Q RF system provides a real function structure to verify the working principle, block functions and performance evaluation of the developing digital low-level RF system. This work presents the designed function diagrams, the measured results for the characteristics of the main RF components, and the performance testing of the analog I/Q RF control system with a dummy cavity.  
 
WEPMA073 Control System based on PCs and PLCs for the L-band Linac at Osaka University linac, power-supply, electron, klystron 425
 
  • R. Kato, G. Isoyama, S. Kashiwagi, S. Suemine, T. Yamamoto
    ISIR, Osaka
  The L-band electron linac at the Institute of Scientific and Industrial Research (ISIR), Osaka University, has been remodeled for higher stability and reproducibility of operation. A computer control system has been newly introduced for the linac not only to realize precise reproducibility of operation but also to make routine operation possible by even an unskilled operator. The new control system is based on personal computers (PCs) and programmable logic controllers (PLCs). The PCs and the PLCs are connected with networks using two different communication protocols. As the network connecting the PLCs, we have chosen FL-net, which is an open PLC network for factory automation. On the other hand, the PCs communicate each other with Ethernet. In order to transfer control information between these two networks with different protocols, one of the PCs is equipped with both FL-net and Ethernet and works as a gateway server. The PC converts data in the common memory in FL-net to the form accessible to the other PCs and vice versa. In this paper, we present details of the control system and operational experiences.  
 
WEPMA075 Improvement of Web-Based Monitoring of EPICS-IOC for PAL Control System monitoring, linac, site, acceleration 428
 
  • J. M. Kim, K. M. Ha, H.-S. Kang, J. H. Kim, E.-H. Lee
    PAL, Pohang, Kyungbuk
  We are now operating a web-based monitoring system of PAL control system with MAC Power PC. In order to expand the IOC’s web-based monitoring system, we are trying to use the X86/Linux platform. With the experience which we got in developing the web-based monitoring of EPICS-IOC based on MAC Power PC, a web-based monitoring system with an X86 Intel PC based on a new concept has been developed for lower costs, easier access and use. Its operating system employs Linux Fedora Cor·104. In order to drive the web-based monitoring system, EPICS Base 3.14.8 and MySQL 4.0 have been installed in the Linux Fedora Core 4. Archive engine with C language and EPICS channel access library are programmed to store the data. As a result of using the web-based monitoring system based on the X86 Intel PC, we have achieved its easier access and use, more convenient maintenance. Performance of the web-based monitoring system with an X86 Intel PC will be discussed.  
 
WEPMA077 Monitor and Archive System of Instrumentation monitoring, instrumentation, cryogenics, synchrotron 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.  
 
WEPMA080 Control System for the Bending MPS at PLS Linac power-supply, linac, monitoring, klystron 437
 
  • J. H. Kim, J. Choi, K. M. Ha, J. Y. Huang, H.-S. Kang, J. M. Kim, S.-C. Kim, I. S. Ko
    PAL, Pohang, Kyungbuk
  The former control system of the bending MPS (Magnet Power Supply) has a three-layered architecture. It was developed by in-house members in early 1993. It is upgraded based on EPICS as the protocol for the full upgrade of the PLS control system. We have replaced the former VME 68K CPU boards with OS-9 to new Power CPU boards operated by VxWorks as IOC in the linac klystron gallery. The upgraded bending MPS control system consists of a MVME5100 EPICS IOC core in the lower level control. It is implemented with the MEDM tool of EPICS to provide friendly Graphical User Interfaces. This paper describes the VME IOC and OPI and embedded local controller in MPS cabinet used for the bending MPS control in the PLS linac

Pohang Accelerator Laboratory, Pohang, 790-784, KoreaThis works supported by the Ministry of Science and Technology, Korea.

 
 
WEPMA085 Implementation and Experience of Energy Ramping for Indus-2 power-supply, dipole, quadrupole, sextupole 443
 
  • R. K. Agrawal, A. Chauhan, P. Fatnani, R. Husain, K. Saifee, M. Seema, Y. M. Sheth, G. Singh
    RRCAT, Indore (M. P.)
  Beam energy ramping in Synchrotron Radiation Sources (SRS) requires synchronous increase in power supply currents attached to various magnets. This paper describes the implementation at various layers of control system architecture, experience of ramping beam energy from injection energy to 2 GeV. The total Ramping system hardware and software for both Magnet power supplies and RF cavity voltage are described with problems faced during the energy ramping. The implemented ramping system provides a tracking uncertainty less than 10μsec in time.  
 
WEPMA086 First Experiences with Central Web Based Fault Information System radiation, synchrotron, 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.  
 
WEPMA087 Control System for Beam Diagnostic System of Indus-2 diagnostics, electron, monitoring, injection 449
 
  • A. Chauhan, P. Fatnani, S. Gangopadhyay, B. N. Merh
    RRCAT, Indore (M. P.)
  This paper presents the Beam Diagnostics Control System for Indus-2 that monitors and controls the parameters related to Beam Profile Monitors (BPM), Beam Position Indicators (BPI), Direct Current Transformer (DCCT) and XZ-selection for strip-lines. The system has three-layered architecture. The middle and lower layer have VME stations with CPU cards having RTOS OS-9. The lowest layer has nine stations that house various Analog and Digital I/O boards connected to the actual devices in the field. The boards include 4-channel 16-bit ADC cards developed for BPI interfacing. The middle layer collects the data from lower layer and passes to top layer and passes the commands from top layer to the lower layer. The top layer has the GUI for operator control built using a SCADA software PVSS. It provides various features to the user for graphical display, trending, configuring, controlling, data-logging and selective data monitoring of the parameters. This system finds use right from the beam injection stage to the Orbit correction stage in addition to the normal operation stage of the machine.  
 
WEPMA089 Control and Instrumentation for the VEC Superconducting Cyclotron Cryogen Delivery System cyclotron, instrumentation, monitoring, vacuum 452
 
  • T. Bhattacharyya, R. K. Bhandari, T. D. Das, C. N. Nandi, G. P. Pal
    DAE/VECC, Calcutta
  The cryogen delivery system for the superconducting cyclotron supplies liquid helium to the superconducting main magnet coil and three cryopanels. It also supplies liquid nitrogen to the thermal shield of the liquid helium chamber housing superconducting coil and the thermal shield and baffles surrounding the cryopanels. A suitable efficient piping network comprising vacuum jacketed cryogenic transfer lines, liquid nitrogen shielded transfer line and distribution manifold is used in the superconducting cyclotron for distribution of cryogens. A liquid helium pump ensures the required flow of liquid helium through the cryopanels. The cryogen delivery system is fitted with necessary field instrumentation and controllers to monitor and automatically control certain important process variables. The control system is a PLC based system which takes care of cool down, steady state, quench protection and warm up mode and generates alarm and interlock signals whenever necessary. The SCADA communicates with the PLC through dedicated control LAN and enables the operator to monitor, control and data log. This paper reports the overall control and instrumentation for the cryogen delivery system.  
 
WEPMA090 Status of the Superconducting Insertion Devices Control System at TLS power-supply, insertion, insertion-device, cryogenics 455
 
  • K. H. Hu, J. Chen, K. T. Hsu, S. Y. Hsu, C. H. Kuo, D. Lee
    NSRRC, Hsinchu
  Superconducting insertion devices installed at Taiwan Light Source to service fast growth X-ray users’ community. Control system is implemented to support the operation of all these superconducting insertion devices. Control system coordinates the operation of the main power supply and the trimming power supply to charge/discharge the magnet and provide essential interlock protection for the coils and vacuum ducts. Quench detection and various cryogenic interlock are designed to protect the system. Friendly user interface and control applications are developed to support routine operation. Diagnostic the trip of superconducting insertion devices related to machine operation is also addressed. Design consideration and details of the implementation will be summary in this report.  
 
WEPMA096 Rejuvenation of Linac Control System for TLS linac, booster, gun, vacuum 458
 
  • C. Y. Wu, J. Chen, K. T. Hsu, S. Y. Hsu, K. H. Hu, J.-Y. Hwang, C. H. Kuo, D. Lee, K.-K. Lin, C.-J. Wang
    NSRRC, Hsinchu
  The pre-injector control system is a turn-key system, which was deployed 15 years ago. It is complicated and out-of-date nowadays in terms of system integration and hardware upgrading. It must be modernized to ensure its performance and reliability, and most importantly, to facilitate system maintenance. Modernization involves upgrading to enhance functionality, to prevent obsolesce of out-of-date control modules, and to replace old parts. The purpose of the upgrade plan is to replace the pre-injector control system by a new unit which has the same control environment as that of the main control system of the NSRRC accelerator facilities. Thus, the control system maintenance, as a whole, will be made substantially easier than the original system.  
 
WEPMA099 A New, PXI Bus Based, Pattern Memory System for the Siam Photon Source. power-supply, synchrotron, booster, 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.  
 
WEPMA103 The Design And Performance of the Prototype Digital Feedback RF Control System For the PLS Storage Ring feedback, linac, resonance, proton 464
 
  • I. H. Yu, J. Y. Huang, H.-S. Kang, D. T. Kim, H. Y. Kim, S.-C. Kim, I. S. Park
    PAL, Pohang, Kyungbuk
  The digital feedback RF control system for the Proton Engineering At the Pohang Light Source (PLS) Storage Ring, the low level RF system based on analog technique provides RF field control for the 4 RF stations, and each station drives each RF cavity at 500.082MHz. To achieve better control system stability and accuracy, the prototype digital feedback RF control has been developed in Pohang Accelerator Laboratory (PAL). In addition to RF field control, it provides cavity resonance control, and incorporates the personnel and machine protection functions. An accelerator electric field stability of ± 0.5% in amplitude and ± 0.5° in phase is required for the RF system. In order to accomplish these requirements, a digital feedback control technique is adopted for flexibility of the feedback and feed forward algorithm implementation. In this paper, the design and performance of this system will be presented with the performance test results.  
 
WEPMA104 Drive System Instrumentation For VEC SCC Axial-Hole Magnetic Field Measurement cyclotron, instrumentation, extraction 467
 
  • T. Bhattacharyya, R. K. Bhandari, T. D. Das, C. Mallik, C. N. Nandi, G. P. Pal
    DAE/VECC, Calcutta
  Charged particle from the ECR ion source is injected axially into the VEC superconducting cyclotron. The ion beam passes through the vertical section of the axial injection system and the axial hole at the centre of the superconducting cyclotron before reaching the spiral inflector. An accurate knowledge of the magnetic field in the axial hole is essential to properly inject and accelerate the ion beam in the superconducting cyclotron. Three channel F. W. Bell tesla meter with both axial and transverse probes were used to measure the magnetic field. A probe drive with high resolution and repeatability was developed to map the field along this hole from median plane upto 3m above. Stepper motor drives three lead screws which move the hall probe assembly and position them correctly at regular intervals. The basic hardware includes a stepper motor, its drive control unit, PC with National Instrument PCI-6052E data acquisition card and RS232 interface for tesla meter. The GUI developed using Labview takes care of the stepper motor drive control, measurement of the field and statistical error analysis. This paper describes the set up and control system of this measurement.  
 
WEPMA110 Development of 100 kW RF Amplifier for Superconducting Cyclotron at VECC impedance, power-supply, cyclotron, higher-order-mode 476
 
  • S. S. Som, M. B. Banerjee, D. S.B. Bhattacharyay, S. B. Biswas, P. G. Gangopadhyay, A. Mandal, S. K. Manna, A. K. Mukherjee, S. P. Pal, J. S.P. Prasad, P. R. Raj, M. S. Saha, S. Saha, S. Seth, K. V. krishnaiah
    DAE/VECC, Calcutta
  High power rf amplifiers (3 nos.) have been developed at our centre for feeding power to three nos. of coaxial rf cavities of the k500 Superconducting Cyclotron. Each of this amplifier can supply output power of 100 kW (max.) at 50 Ω impedance within the frequency range of 9 MHz to 27 MHz. The amplifier, based on Eimac 4CW 150,000E water-cooled tetrode, is tuned by moving the sliding short of the coaxial cavity within the said frequency range. An inductive coupling loop is inserted along one side of the coaxial cavity through the sliding short and is matching the output impedance of 50 ohm. The four identical Bridge-T network in the grid of the final amplifier are driven with equal power levels of up to 150 watts. The amplifier is operated in Class-AB mode with power gain of 22 dB. A PC-based stepper motor controlled sliding short movement system have been done. The frequency response of the input circuit of the amplifier has been measured using Vector Network Analyzer and the result is very satisfactory.  
 
WEPMA119 Control Characteristics of the PEFP RF System klystron, proton, power-supply, site 485
 
  • H.-J. Kwon, Y.-S. Cho, I.-S. Hong, H. S. Kim, K. T. Seol, Y.-G. Song
    KAERI, Daejon
  A 20 MeV proton accelerator has been developed and tested at Proton Engineering Frontier Project (PEFP) as a front-end part of the 100 MeV accelerator. The initial test results showed that more stable rf operation was necessary to investigate the machine characteristics more deeply. A LLRF control system using commercially available digital board was newly developed and tested for this purpose. The goals of the rf control for 20 MeV accelerator are to achieve errors within 1 % in amplitude and 1 degree in phase against external perturbations such as the change of resonant frequency, fluctuation of klystron power supply voltage and also beam loading. In addition, the PEFP 20 MeV DTL has unique characteristics that single klystron drives four tanks simultaneously. In this paper, the initial test results of the rf system with digital controller are presented and its control characteristics are discussed.  
 
WEPMA120 Development of the Digital RF Control System for the PEFP Proton Accelerator feedback, simulation, proton, beam-loading 488
 
  • H. S. Kim, Y.-S. Cho, I.-S. Hong, H.-J. Kwon, K. T. Seol, Y.-G. Song
    KAERI, Daejon
  The low level RF system is under development for the PEFP Proton Accelerator. The RF amplitude and phase stability requirements of the LLRF system are ±1% and ±1°, respectively. As a prototype of the LLRF, a simple digital PI control system based on commercial FPGA board is designed and tested. The main features are a sampling rate of 40 MHz which is four times higher than the down-converted cavity signal frequency, digital in-phase and quadrature detection, pulsed mode operation with the external trigger, and a simple proportional-integral feedback algorithm. The control logic is implemented in the Xilinx FPGA by using VHDL coding and the application program based on the VxWorks and VME platform is also developed. In this paper, the detailed design study and the test results of the prototype LLRF system are presented.  
 
WEPMA132 Superconducting Niobium Resonator Fabrication And Testing At IUAC linac, electron, coupling, proton 500
 
  • P. N. Prakash, D. Kanjilal, K. K. MISTRI, A. Roy, S. S.K. Sonti, J. Zacharias
    IUAC, New Delhi
  Superconducting niobium resonator fabrication and testing facilities have been developed at Inter-University Accelerator Centre. The facilities are used to construct niobium resonators for the superconducting booster linac as well as for future accelerator development projects. In the first phase a single quarter wave resonator (QWR) was successfully fabricated and tested. In the second phase two completely indigenously built QWRs were constructed. In cold tests at 4.5 K one of them performed at 3.5 MV/m with 3.5 W RF input power, exceeding the nominal design goal. After the successful completion of this project production of fifteen QWRs for the 2nd and 3rd linac modules began. This work has progressed sufficiently and we plan to complete the production by mid ‘2007. In addition to resonator fabrication the facilities have been used for other developments such as a new design of niobium-stainless steel transition assembly, slow tuner modifications, and repairing of the existing QWRs. Details of the activities and performance of the resonators will be presented.  
 
WEPMA135 Mechanical Analysis and Design of the PEFP Low Beta Cavity simulation, superconducting-RF, linac, radiation 506
 
  • S. An, Y.-S. Cho, B. H. Choi
    KAERI, Daejon
  Proton Engineering Frontier Project (PEFP) Linac employs the superconducting RF cavity of β=0.42 to accelerate the proton beam with repetition rate of 60 Hz. In order to control the Lorentz force detuning effect, a stiffening structure with double rings and cones is designed for PEFP low beta cavities. This stiffening structure can reduce Lorentz force detuning coefficient to be lower than 1 Hz/(MV/m)2. The cavity’s mechanical modes are calculated by using ANSYS 2-D model and 3-D model. The calculation results demonstrate that PEFP Low Beta Cavity has no dangerous mechanical modes for 60 Hz pulse repetition. The mechanical stability of the SRF cavity is analyzed under the atmosphere pressure after being pumped down and under the helium liquid pressure after being cooled down.

*This work is supported by the 21C Frontier R&D program in the Ministry of Science and Technology of the Korean government.

 
 
WEPMA142 Commissioning and Operational Experience with INDUS-2 RF Systems injection, klystron, power-supply, vacuum 517
 
  • M. Lad, M. K. Badapanda, A. Bohrey, P. R. Hannurkar, A. Jain, M. K. Jain, N. Kumar, M. Prasad, V. Rajput, D. Sharma, N. Tiwari, R. K. Tyagi, R. K.DEO. deo
    RRCAT, Indore (M. P.)
  2.5 GeV, 300mA Synchrotron Radiation Source Indus-2 is under commissioning phase at RRCAT, Indore. The beam injection in Indus 2 from Booster Synchrotron started in July 2005,since then RF system is in operation. RF system compensates the SR losses experienced by the circulating electrons in the bending magnets and insertion devices. In addition to compensate Synchrotron losses, RF system will have to supply power for boosting energy from 600 MeV to 2.5 GeV. Indus-2 RF system employs four numbers of ELETTRA make elliptical cavities to generate 1500 kV accelerating RF voltage at 505.812 MHz. Each RF cavity is powered by 64 kW RF amplifier. With around 650 KeV of SR losses the system is designed to provide cavity gap voltage such that sufficiently high quantum and Touschek lifetime is achieved. Initially conditioning of all four RF cavities was performed. Then system was handed over for operation and with beam trials optimization of different parameters of RF system is being done. The paper describes test results of Indus-2 RF system & commissioning and operational experience of Indus-2 RF system.  
 
WEPMA143 High-Power, Low-Loss, Radial Rf Power Dividers/Combiners impedance, insertion, coupling, simulation 520
 
  • A. Jain, A. Gupta, P. R. Hannurkar, D. Sharma
    RRCAT, Indore (M. P.)
  A 20 kW Solid State Power Amplifier (SSPA) at 352 MHz development is in progress at RRCAT. This design uses radial splitting and combining architecture in which the signal is divided into a number of individual parts. Each individual part is then amplified by a respective amplifier of 200 W. The outputs of the amplifiers are then combined into a single output that achieves final output power of the order of 1.5 kW to 4 kW. As a part of this system, two high power combiners have been designed and developed. One is 8 way with output ports opposite to input port. Second one is 16 way with radial output ports. Both of these designs are compact with 20 cm diameter of outer radial disk. Input ports are N connector, while output port is 15/8” rigid coaxial line. Measured performance of these two designs shows insertion loss of 0.6 dB and input VSWR of 1.09. Radial architecture uses in-phase, non-resonant radial transmission line structures.  
 
WEPMA145 Development of A 35 Kw Power Amplifier At 350 Mhz For RFQ Accelerator Based Neutron Generator power-supply, rfq, cathode, simulation 526
 
  • M. M. Pande, V. K. Handu, N. R. Patel, V. Rao, A. Soni
    BARC, Mumbai
  • K. R. Shinde
    New Affiliation Request Pending, -TBS-
  A Radio Frequency Quadrupole (RFQ) based 14 MeV Neutron generator is being developed at BARC, as a part of its ADSS program. It is estimated that RF power of about 70 KW is required in RFQ to accelerate 1mA deuterium beam up to 400 KeV. Hence two RF systems, feeding power of about 35 KW at each of the two ports of the accelerator, are being developed. Each RF system employs a 100 W solid state driver, 1500 W intermediate power amplifier (IPA) using EIMAC 8938, and a high power amplifier (HPA) using TH571B. Solid state driver has been tested to 100 W. The IPA has been tested to 100 W in grounded grid configuration and with half wavelength strip line output circuit. The HPA cavity with tube is installed and being analyzed at low power. The 6 1/8 inch, 50 Ω coaxial transmission line has been simulated in Microwave Studio for analyzing RF parameters. The anode power supply (12KV/10 Amp) of HPA has been tested and installed. A spark gap based crowbar circuit for anode is under construction. For HPA the thyristor based safeguard circuit for screen grid, a ramping filament control circuit (0 to 8 Volts in 5 minutes) and an overall control-interlock system has also been developed.  
 
THYMA04 Development of Quarter Wave Resonators linac, coupling, damping, vacuum 554
 
  • A. Roy
    IUAC, New Delhi
  The accelerating structure for the superconducting linac booster for the 15 UD Pelletron at IUAC is a Nb QWR cavity, designed and fabricated as a joint collaboration between IUAC and ANL, USA. Initial cavities required for the first linac module were fabricated at ANL. For fabrication of cavities required for future modules a Superconducting Resonator Fabrication Facility has been set up at IUAC. Three quarter wave resonator (QWR) cavities have been fabricated and fifteen more resonators for the second and third linac modules are in advanced stage of completion. This facility has allowed us to undertake repairs on some of the resonators which sprung leaks. First experiment with the accelerated Si beam through the first linac module having eight resonators along with a superconducting solenoid have been conducted recently.  
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THYMA05 Low-level RF Control System Design and Architecture feedback, simulation, klystron, linac 559
 
  • L. R. Doolittle
    LBNL, Berkeley, California
  Low-level RF (LLRF) control hardware and its embedded programming plays a pivotal role in the performance of an accelerator. Modern designs implement most of the signal processing in the digital domain. This reduces the size and cost of the hardware, but places the burden of proper operation on the programming. FPGAs (field programmable gate arrays) and communications-grade ADCs and DACs enable sub-microsecond group delay for the LLRF controller feedback signal. Ancient concepts of the virtue of simplicity are easy to apply to the hardware, but more of a challenge in the context of programming. Digital signal processing, combined with dedicated hardware, can control and maintain cavity phase (relative to an absolute reference) unaffected by drift or 1/f noise of any long cables or active components. Developing and testing that programming is a very real challenge. This paper discusses approaches and techniques to make LLRF systems meet their goals in upcoming accelerators.  
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THC2MA01 Design of The PEFP Low Beta Cryomodule vacuum, shielding, linac, radiation 564
 
  • S. An, Y.-S. Cho, B. H. Choi
    KAERI, Daejon
  A low beta elliptical superconducting RF (SRF) cavity has been designed for the linac of Proton Engineering Frontier Project (PEFP). A double stiffening-ring structure is designed to reduce cyclic Lorentz force detuning of the PEFP low beta cavity. HOM analysis has shown, for the PEFP low beta cavities, the HOM coupler’s Qext needs to be lower than 3·10+5 for reducing influence of the dangerous modes on the beam instabilities and HOM-induced power. A coaxial coupler with two stubs, one hook and the coupling tip directly installed on the inner conductor is designed for PEFP cryomodules. The cooling system including is designed for the PEFP cryomodules. A magnetic shielding structures shaped by two coaxial cylinders is designed for the PEFP low beta cryomodules.

*This work is supported by the 21C Frontier R&D program in the Ministry of Science and Technology of the Korean government.

 
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THC2MA02 Experiences with the Manufacturing, Testing and Quality Control of Large Number of Superconducting Magnets cryogenics, sextupole, monitoring, dipole 567
 
  • A. Puntambekar, M. Bagre, V. Jain, M. G. Karmarkar, P. Khare, S. Kotaiah
    RRCAT, Indore (M. P.)
  • G. Mugnai, R. Wolf
    CERN, Geneva
  Raja Ramanna Centre for Advanced Technology has successfully completed the supply of nearly 2000 nos. Superconducting Corrector (SC) Magnets for the LHC project at CERN. Initial prototypes were developed at RRCAT in collaboration with CERN and large scale production was done in industry. These corrector magnets require precision components, accurate assembly procedure, elaborate testing and stringent quality control required for repeatable performance. A number of sub technologies were developed for these magnets at RRCAT and successfully transferred to Industry. These include precision coil winding, joining SC wire to get low contact resistance, measuring it at 4.2 K. Ultrasonic welding machine and automatic coil winding machines were developed. Cryogenic testing procedures and test facility were established at RRCAT. SC switches and current leads were designed and fabricated. Cryogenic testing at 4.2 K and magnetic measurement at 300 K for all the 2000 magnets were done at RRCAT. Special tooling and inspection gauges for in process inspection were made. In this paper we describe the experience gained during technology development, prototyping and technology transfer to industry.  
 
THZMA01 Status of SOLEIL Project vacuum, storage-ring, 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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THZMA03 Construction of Shanghai Synchrotron Radiation Facility storage-ring, power-supply, linac, 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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THZH103 The Progress of Accelerator Mass Spectrometry and their Applications in China site, ion, injection, target 597
 
  • J.-E. Chen, Z. Y. Guo, K. X. Liu
    PKU/IHIP, Beijing
  The AMS technology and their applications have been developed at Peking University, China Institute of Atomic Energy and Chinese Academy of Sciences since 1980s’. In this presentation, the AMS facilities in China are described and the applications mainly in the field of archaeology are presented. Interesting results about the establishment of Chronology frame of Xia-Shang-Zhou dynasties based on cultural remains at Longshan, Er-li-tou. Xinzha and Tianma-Qucun Site etc. are given as examples. More then one hundred samples of oracle bone were studied for archaeological radio-carbon dating with the AMS facility at Peking University. AMS applications in the fields of geosciences, environmental and biomedical sciences are introduced as well.  
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THPMA004 RF Amplifiers and Structures for ISAC/TRIUMF linac, power-supply, rfq, RF-structure 631
 
  • A. K. Mitra, Z. T. Ang, I. V. Bylinskii, K. Fong, R. E. Laxdal, J. Lu, R. L. Poirier, V. Zviagintsev
    TRIUMF, Vancouver
  The ISAC-I accelerator is comprised of two room temperature linacs; a 35MHz RFQ and a 106MHz separated function drift tube linac producing an accelerating voltage up to 4.5MV and 8.1MV respectively. In addition a pre-buncher, chopper and several re-bunchers are used in the accelerator chain to manipulate the longitudinal phase space. A heavy ion superconducting linac is being installed at ISAC/TRIUMF to increase the energy of ISAC-I from 1.5 MeV/u to 6.5 MeV/u for ISAC-II. A first stage, now in commissioning, consists of twenty medium beta cavities driven by twenty, 106MHz, tube amplifiers. In the second stage of ISAC-II, 20 high beta quarter wave superconducting cavities will be installed operating at 141 MHz. A transfer line connecting ISAC-I and ISAC-II has a room temperature buncher cavity at 35 MHz. This report will summarize rf amplifiers employed in ISAC facility and discuss the choice of amplifiers for the second stage of ISAC-II. Some of the re-furbishing and improvements that are done to ISA-I rf system will also be discussed.  
 
THPMA005 SCSS RF Control Toward 5712 MHz Phase Accuracy of One Degree klystron, electron, laser, acceleration 634
 
  • Y. Otake, M. Kitamura, H. Maesaka, T. Shintake
    RIKEN Spring-8 Harima, Hyogo
  • T. Fukui, N. Hosoda, T. Ohata, T. Ohshima
    JASRI/SPring-8, Hyogo-ken
  To check the feasibility of X-FEL(SCSS), the 250 MeV prototype accelerator was constructed at SPring-8. The low level RF control system with a 5712 MHz pulsed RF signal was built to achieve very-tight requirements that were phase stability and resolution of less than 1 deg.. These requirements correspond to a beam energy variation of 10-4 at the crest acceleration and time stability and resolution of less than 500 fs. To realize the requirements, IQ modulators/detectors, arbitrary wave form generators/detectors of VME modules to handle an IQ function were developed. The PID control and the adaptive control method, which the modules can manipulate, were employed to obtain the requirements. We finally achieved the phase setting and detecting resolution of the IQ detectors/modulators of ± 0.5 deg.. Decreasing the phase drift was achieved by the PID control program, and reducing the phase variation within a pulse width of 2 us was achieved by the adaptive control function on the VME modules. The unnecessary time jitters of the pulse were also automatically detected by the module function. In this paper, we describe a summary of the system and its phase control performance.  
 
THPMA010 Structures of Quadrupole Magnet Core quadrupole, pick-up, vacuum, magnet-design 640
 
  • N. Li
    SLAC, Menlo Park, California
  In general, there are two different quadrupole core designs: two pieces (up half and low half cores) and four pieces (four quarter halves). Both structures work on those quadrupole magnets in different accelerators around the world. There is no certain rule about which design is good for what machine, it is most likely defends on the engineer’s favor and the coil size. There is advantage and disadvantage for both structures. However, the disadvantage of four pieces design is rather visible. It is the goal of this paper to study those advantages and disadvantages of two types of core structure from manufacturer’s point of view and the perturbations of the magnet field.

* Iron Dominated Electromagnets

 
 
THPMA016 Median Plane Magnetic Field Mapping for Superconducting Cyclotron (SCC) in VECC cyclotron, monitoring, extraction, shielding 652
 
  • A. Roy, T. Bhattacharjee, R. B. Bhole, U. Bhunia, Chaddha, N. Chaddha, J. Debnath, M. K. Dey, A. Dutta, C. Mallik, C. N. Nandi, Z. A. Naser, G. P. Pal, S. Pal, S. Paul, J. Pradhan
    DAE/VECC, Calcutta
  The magnetic field upto 29 inch radius on median plane of SCC Magnet (Peak field 5.8T) is measured over its operating range. A client-server system is developed to minimise mapping time and human intervention. The magnetic field is mapped at radial interval of 0.1 inch and angular interval of 1 degree. The complete map of 360 degree comprised of about 100K field points is obtained in less than 100 minutes. The field mapping system is designed to work as PC based TCP Client-Server to reduce the design complexity, system overload and debugging effort. The Server program is developed as windows console in ‘C’ and the Client is developed using LabView to provide a user friendly operation console along with online preliminary display and analysis of field data. This architecture provides a reliable and easily modifiable control s/w. The correctness of the magnet assembly is calculated from the acquired data, which in-turn represents the correctness of measurement system. A detailed study of the magnet characteristic is done. The first harmonics of the fields at different radii are obtained at all magnet excitation and corrected by coil-centering and shims placement.  
 
THPMA023 Construction of SSRF Magnet Power Supply System power-supply, booster, storage-ring, 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.  
 
THPMA024 Implementation of High Precision Magnet Power Supply using the DSP power-supply, feedback 666
 
  • K.-H. Park, J. Choi, C. W. Chung, S.-H. Jeong, D. E. Kim
    PAL, Pohang, Kyungbuk
  • B.-K. Kang
    POSTECH, Pohang, Kyungbuk
  This paper presents the precision magnet power supply for the Pohang Light Source using the digitally controlled PWM method. The required current to energize the some magnets was 600 A with the high precision of ~10ppm at least to accomplish a high stable beam operation. This power supply has been implemented using a digital signal processor, TMS320F28 series from Texas Instruments, with high speed external 16-bit ADCs. The designed digital controller includes both a current feedback loop and a DC link voltage feed-forward loop, which was applied by the PI control scheme. To reduce the output current ripple, the damped L-C filter was fabricated at both the DC link and load sides. Various experimental results such as stability, bandwidth and harmonic analysis, as well as simulation are given to verify the characteristics of the DSP based magnet power supply.  
 
THPMA028 Regulation Scheme for Precision Magnet Power Supply power-supply, feedback, antiproton, monitoring 669
 
  • S. Bandyopadhyay, M. Das
    DAE/VECC, Calcutta
  Accelerators require extremely precise high-current magnet power supplies to drive their magneto-optic devices for proper beam dynamics. The dc precision of the power supply, which generally defines the absolute tolerance of its current, can be split up into three distinct parts — ripple, short-term and long-term stability. To ensure that the output current is within an error-band of 10ppm or less, a three-loop regulation topology has been developed and implemented in a high current magnet power supply (750A/12V) that uses transistor bank as the series pass element.  
 
THPMA032 Active Filter for Harmonic Mitigation for Magnet Power Supplies of INDUS-II impedance, power-supply, resonance, feedback 671
 
  • Y. P. Singh, S. Kotaiah, A. C. Thakurta
    RRCAT, Indore (M. P.)
  Power supplies used for powering of magnets in INDUS-I and INDUS-II uses different type of power converters including SMPS and thyristorised power converters. Though considerations are given to keep the harmonic loading on a.c. mains low while designing these power supplies and selecting a suitable power converter for the required power, still they give a significant amount of harmonic loading on a.c. mains. In all the high power d.c. power supplies, wide variation in operating point leads to a considerable amount of reactive power generation and harmonic loading on ac mains. In this work a study has been performed to know the variation of reactive power with time on some of the d.c. power supplies of INDUS-II. Various options to improve the power factor has been studied and their advantages & limitations for accelerator magnet power supplies has been highlighted. A combined system of a shunt passive and small rated series active filter has been proposed. The compensation principle is described and filtering characteristics are discussed in detail. A scale down prototype of proposed series active filter has been developed in lab and experimental results produced.  
 
THPMA033 Digital Power Supply Development at the PLS power-supply, simulation, booster, feedback 674
 
  • K. M. Ha, J. H. Kim
    PAL, Pohang, Kyungbuk
  Digital power supply controller using the Digital Signal Processor (DSP) and Field Programmable Gate Array (FPGA) has been developed over the year at the Pohang Light Source (PLS). Recently, full digital power supply controller has been completed and tested. A new digital controller is designed as 3U euro-standard size and provides overall performance of the power supplies stability better than 5 ppm short-term stability (< 1 min) and 25 ppm long-term stability (< 12 hours). The digital controller made use of the digital PID current controller with one-pole digital filter and feed-forward voltage ripple compensation control algorithms. By implementation of the digital controller, it is capable of high step resolution (150 ps) Digital Pulse Width Modulation (DPWM) for FET or IGBT switch drivers and high resolution (18-bit, 400 kSPS) analog to digital converter (ADC) for current and voltage signal measurements. In this paper the hardware and software structure of the developed digital controller and experimental results of digital power supply are described.

Pohang Accelerator Laboratory, Pohang, 790-784, Korea* This works supported by the Ministry of Science and Technology, Korea.

 
 
THPMA039 300 kV/ 6 kW Power Supply System for Self-shielded Low Energy DC Accelerator at RRCAT Indore power-supply, electron, damping, cathode 679
 
  • R. Banwari, A. Kasliwal, S. Kotaiah, A. Kumar, T. G. Pandit, P. R. Peteti, A. Upadhyay
    RRCAT, Indore (M. P.)
  A compact, low energy, self-shielded dc accelerator for industrial applications requiring beam energy in the range of 100 to 300 keV is under development at RRCAT, Indore. The power supply and control system for this accelerator is discussed here in this paper. The high voltage source is a series fed cascade generator driven by a 30 kHz sine wave inverter. Two asymmetrical cascade generators are run in parallel to enhance the current capacity of the generator. A 15-0-15 kV, 30 kHz ferrite core transformer interfaces the cascade generators with IGBT based H-bridge inverter. A buck chopper controls the dc bus voltage of the inverter so as to control the terminal voltage of the high voltage generator. A low power high frequency inverter generates the filament power supply floating at terminal voltage of the accelerator through a capacitive isolation column. Control of the filament power supply is achieved by sensing the accelerator beam current and controlling the low power inverter in a closed loop. A PC based control system designed with Lab-view 7.0 software and ADUC812 Micro-converter cards monitors and displays the various parameters of the power supply and accelerator.  
 
THPMA043 Development of 3 MeV, 30 kW DC Electron Accelerator at EBC, Kharghar electron, vacuum, radiation, gun 682
 
  • K. C. Mittal, S. Acharya, R. Agarwal, R. Barnwal, D. P. Chakravarthy, A. S. Chawala, A. R. Chindarkar, S. R. Ghodke, B. S. Israel, A. Jain, D. Jayaprakash, M. K. Kumar, M. K. Kumar, R. L. Mishra, K. V. Nagesh, K. Nanu, M. K. Pandey, G. P. Puthran, R. N. Rajan, S. R. Raul, A. K. Ray, P. C. Saroj, D. K. Sharma, V. Sharma, R. Shilendra, S. K. Suneet, S. B. Supriya, D. P. Suryaprakash
    BARC, Mumbai
  A 3 MeV, 30 kW DC industrial electron accelerator has been designed and is in advanced stage of development at EBC, Kharghar, Navi Mumbai. Electron beam at 5 keV is generated in electron gun with LaB6 cathode and is injected into accelerating column at a vacuum of 10-7 torr. After acceleration, the beam is scanned and taken out in air through a 100 cm X 7 cm titanium window for radiation processing applications. The high voltage accelerating power supply is based on a capacitive coupled parallel fed voltage multiplier scheme operating at 120 kHz. A 50 kW oscillator feeds power to high voltage multiplier column. The electron gun, accelerating column and high voltage multiplier column are housed in accelerator tank filled with SF6 gas insulation at 6 kg/sq.cm. The accelerator is located in a RCC building with product conveyor for handling products. A central computerized control system is adopted for operation of the accelerator. Accelerator is in the advance stage of commissioning. This paper describes the design details and current status of the accelerator and its various subsystems.  
 
THPMA047 Stair Current Output Power Supply for Switching Magnet power-supply, feedback, quadrupole, electron 691
 
  • S.-H. Jeong, J. Choi, H.-S. Kang, D. E. Kim, K.-H. Park
    PAL, Pohang, Kyungbuk
  The switching magnet for beam distribution to 5 beamlines of 20-MeV PEFP is served with DSP-controlled PWM switching-mode converter. This converter is employed IGBT module and a DSP (Digital Signal Processor) that is operated at ?350A, 2.5 Hz stair output. Current feedback and input voltage feed-forward control schemes are applied to improve the output current stability. Designed filter result in the good stability of each stair. Simulation and experimental results show that the implemented converter achieves stable repeat response at each stair and feasibility for versatile power supply.  
 
THPMA051 Cure of Temperature Fluctuations on the Nitrogen-cooled Sections of a CESR-type SRF Module vacuum, shielding, storage-ring, 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.  
 
THPMA063 Energy Stabilization of 2.5 GeV Linac using DeQing linac, feedback, klystron, power-supply 717
 
  • S. H. Kim, Y. J. Han, J. Y. Huang, S.-C. Kim, S. H. Nam, S. S. Park
    PAL, Pohang, Kyungbuk
  The 2.5 GeV electron linac of Pohang Accelerator Laboratory (PAL) employs 80 MW klystrons with matching 200 MW modulators as RF sources. Beam voltage stability of the klystron is directly related to a PFN (pulse forming network) charging voltage of the modulator. Therefore, a good regulation of a PFN charging voltage is essential in the modulator. The regulation of the klystron pulse voltage amplitude is made by controlling the PFN charging voltage. In a conventional resonant charging pulse modulator, the regulation is usually achieved by using a deQing circuit. The required beam voltage regulation of less than ± 0.5 %, without deQing circuit, has been achieved by using a SCR phase controller with a voltage regulator. For further improvement of the beam voltage stability for the PAL XFEL (x-ray free electron laser) linac, PAL is studying a deQing circuit aiming at the stabilization of less than 0.02%. A new deQing circuit has been developed with a compensation function which can reduce a charge voltage fluctuation by about several times. The design concept and performance of the deQing circuit will be discussed.  
 
THPMA064 Development of a 200keV Linear Induction Accelerator induction, acceleration, linac, power-supply 720
 
  • K. V. Nagesh, S. Acharya, R. Agarwal, D. P. Chakravarthy, S. Mitra, K. C. Mittal, D. D. Praveen Kumar, R. N. Rajan, S. R. Raul, P. C. Saroj, A. S. Sharma, D. K. Sharma
    BARC, Mumbai
  Electron Linear Induction Accelerator (LIA) are for applications for applications in High Power Microwaves (HPM), high gradient accelerators, flash X-Ray radiography (FXR), flue gas clean-up, detoxification of chemicals, cross-linking of polymers, sterilization of food and medical devices, etc. The LIA-200 being developed at APPD/BARC consists of three main phases of pulse compression and voltage amplification, viz; (i)solid-state pulse modulator uses semiconductor devices, (ii)Pulse compression and voltage amplification stages, steps up to 200kV, 5 micro-seconds and compresses these pulses to 75kV, 10kA, 50ns in five stage and (iii)three induction cavities in ADDER mode for relativistic electron beam generation, with matched impedance of 5 ohms. Metglas cores have been used in the switches, cavities and pulse transformers. Deminaralized water capacitors and water transmission lines have been used for low impedance energy storage and compactness. The complete system has been assembled and ready for commissioning. LIA system will be operated from a PLC based control system which is under testing.  
 
THPMA073 Artificial Neural Network Calculates Backward Wave Oscillator Parameters Reliably For Pulsed Accelerators simulation, electron, plasma, radiation 738
 
  • A. Gokhale
    Terna Collage of Engineering, Navi Mumbai
  • B. P. Dubey
    Bhabha Atomic Research Center, Computer Division, Mumbai
  • A. S. Sharma
    BARC, Mumbai
  A method of quickly and accurately getting the dispersion curves for a slow wave structure filled with plasma is investigated. A universal dispersion equation is derived by utilizing the field theory and expressing the slow wave structure's profile in a finite Fourier series. In principle simulation program takes nearly 6 to 8 hours to generate a single result. A trained Artificial Neural Network, used in this study, calculates the BWO dispersion curve in a fraction of a second accurately and reliably.  
 
THPMA074 Operational Analysis of Klystron-Modulator System for PLS 2.5-GeV Electron Linac klystron, linac, electron, feedback 740
 
  • S. S. Park, J. Y. Huang, S. H. Kim, S.-C. Kim
    PAL, Pohang, Kyungbuk
  The klystron-modulator(K&M) system of the Pohang Accelerator Laboratory (PAL) generates high power microwaves for the acceleration of 2.5 GeV electron beams. There are 12 modules of K&M system to accelerate electron beams up to 2.5 GeV nominal beam energy. One module of the K&M system consists of the 200 MW modulator and an 80 MW S-band (2856 MHZ) klystron tube. The total accumulated high-voltage run-time of the oldest unit among the 12 K&M systems has reached nearly 92,300 hours as of June 2006. The overall system availability is well over 95%. In this paper, we review overall system performance of the high-power K&M system and the operational status of the klystrons and thyratron lifetimes, and overall system's availability will be analyzed for the period of 1994 to June 2006.  
 
THPMA076 Development of the Klystron Modulator using a High-voltage Inverter Power Supply klystron, power-supply, cathode, linac 743
 
  • Y. G. Son, C. W. Chung, D. E. Kim, S. J. Kwon, J.-S. Oh
    PAL, Pohang, Kyungbuk
  The existing klystron modulator in the Linac use a 60 Hz high voltage power supply and adopt traditional L-C resonant charging scheme with De-Qing circuit. The stability of the output high voltage is not satisfactory especially when the AC line voltage fluctuations. If an inverter power supply is used as a HV generator, it will just meet the demands A high frequency inverter switching makes the overall system size small. The command-charging feature can guarantee the high reliability of switching function. In order to increase the stability, operating reliability and comply with the PLC (programming logic controller) and touch screen control system of PLS, an upgrading works is now in progress. This paper will discuss some inverter power supply design considerations and show the test results.  
 
THPMA086 Precise Survey and Alignment of Synchrotron Radiation Source Indus-2 alignment, survey, dipole, quadrupole 761
 
  • V. Prasad, D. Barapatre, M. Jagannath, R. K. Sahu, K. P. Sharma, G. Singh
    RRCAT, Indore (M. P.)
  The 2.5GeV third generation synchrotron light source Indus-2 at RRCAT, which in advance stage of commissioning, demanded a high precision of survey and alignment of all its components. In particular, we had to control the transverse and azimuthal positions of all quadrupoles and dipoles within a relative accuracy of 0.1 mm and overall circumference within 2.5 mm. This required a tight control over all the sources of errors starting from fiducializations, survey of networks, final alignment and smoothing. We have successfully accomplished this task by adopting the triangulation-trilateration technique of survey and alignment along with indigenously developed software for online survey data collection, least square adjustment of redundant measurements and error analysis. The accuracy of alignment was reflected from the successful circulation and storage of electron beam in the machine with a very small closed orbit distortion. This paper, in brief, presents the methodology adopted for survey and alignment and final accuracies achieved.  
 
THPMA091 Air Temperature Analysis and Control Improvement for the Injection Area at TLS injection, booster, synchrotron, 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, 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.  
 
THPMA094 SF6 Gas Handling System for 3 MeV, 30 kW Industrial Electron Beam Accelerator at EBC, Kharghar, Navi Mumbai electron, vacuum, gun, instrumentation 779
 
  • S. R. Ghodke, K. K. Abdullah, R. Barnwal, D. P. Chakravarthy, D. Jayaprakash, M. K. Kumar, N. Lawangare, R. L. Mishra, K. C. Mittal, K. Nanu, G. P. Puthran, A. K. Ray, S. B. Supriya, V. S. Veer
    BARC, Mumbai
  The 3 MeV Accelerator Project involves designing, fabrication, installation and commissioning of a 3 MeV, 30 kW Industrial Electron Beam Accelerator with a terminal voltage of 3 MV and is housed inside the Electron Beam Centre building at Kharghar, Navi Mumbai. The Accelerator has capability of delivering electron beam of 3 MeV energy for radiation processing applications. For ecological and economical reason, the SF6 gas is reincorporated into closed cycle because gas should not be released into the atmosphere. The aim of the SF6 gas handling system is to introduce the gas at high pressure to the accelerator tank after evacuation and to bring back into the storage tanks with minimum loss. The gas handling system also provides purification of gas, prevention from mixing with air or any other substances, which may contaminate and thus bring down the high voltage insulation characteristics of the gas. This paper discusses about mechanical design, fabrication, testing and safety of different components of SF6 gas handling system such as gas piping, non lubricating compressor, dryer, vacuum pump, dust & oil filters, storage tanks etc.  
 
THPMA117 Design and Fabrication of Arups U6 Undulator at PLS undulator, insertion, insertion-device, synchrotron 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.  
 
THPMA118 Electron Accelerator of ELV-type and their Worldwide Application electron, extraction, vacuum, radiation 809
 
  • N. K. Kuksanov, S. Fadeev, P. I. Nemytov, R. A. Salimov, M. E. veis
    BINP SB RAS, Novosibirsk
  D. C.ELV accelerators are the most popular Russian accelerators for industrial and research purposes. More than 100 accelerators were deliverd from Germany at west to Japan and Malaya at east. By now the total operation time exceeds 1000 accelerato-years. The design and schematic solutions provide the long term and round-the -clock operation. The specific features of the ELV-accelerators are the simplicity of design, convenience and ease in control and reliability in operation. ELV-type acceleratodrs is covering the energy range from 0.2 to 2.5 MeV with a beam current of up to 500 mA and maximum power of up to 400 kW. The accumulated experience in the design, development, and manufacturing of the ELV-series accelerators enables us to propose the machines which by their parameters do not rank below but in the majority of cases even surpassing the best world samples of such machines. In the work presented here the parameters of ELV electron accelerators are given and the main systems of the accelerator and a wide set of supplementary devices extending the application range of the accelerator is given. The main industrial applications of ELV accelerators are considered also.  
 
THPMA129 High Power Industrial Electron Accelerator electron, power-supply, vacuum, industrial-accelerators 824
 
  • S. C. Bapna, R. Banwari, M. Borage, A. Kasliwal, S. Kotaiah, A. Kumar, P. Kumar, R. Promod, S. R. Tiwari, S. V. Venkateswaran
    RRCAT, Indore (M. P.)
  Development of 2.5MeV/ 100kW air-core transformer type electron Accelerator is in progress at RRCAT in collaboration with BINP, Russia. Energy of the accelerator is variable from 1 to 2.5 MeV with maximum beam current, power and beam scanning width of 50mA, 100kW and 1.5m respectively. High voltage generator, accelerating tube and injector control unit are housed inside the tank filled with pressurized SF6. A 430Hz, 150kW input power source to high voltage generator is based on a high-frequency switching (25kHz) dual half-bridge inverter and modular in construction with 6 modules (each 30kW) operating in parallel. In case one module fails, remaining modules will continue to feed power without de-rating. In this scheme, transformer leakage and magnetizing inductances will be compensated with high voltage capacitors eliminating the need of bulky inductors. The beam is scanned in two mutually perpendicular directions using scanning magnets. The control system uses microcontroller ADuC 812 based cards. Each subsystem will have one such card and a single RS485 multidrop communication link with the PC. The accelerator will be useful for various industrial applications.  
 
THPMA130 Introduction of EPICS in VEC & SCC Control Systems power-supply, monitoring, simulation, cryogenics 827
 
  • T. Bhattacharjee, S. Bandyopadhyay, R. B. Bhole, Chaddha, N. Chaddha, A. De, Kundu, K. C. Kundu, J. Misra, S. Pal, A. Roy, B. Sarkar
    DAE/VECC, Calcutta
  As a part of computerization of the VEC and SCC Control System, using a standard open-source software tool for designing distributed control system named as EPICS (Experimental Physics and Industrial Control System), several IOCs' (I/O controller) have been developed to control and monitor the Main Magnet Power Supply (MPS), Beam line MPS, Deflector PS, Beam line instruments and LCW (Low Conductivity Water) system. The device layer of IOC, responsible for communication with MPS distributed among several multi-drop networks (RS485) ensures reliable and fast response while setting several MPS simultaneously. Process parameters e.g. water level, temperature and conductivity in different subsystems are measured using standard industrial sensors. An IOC has been developed for acquiring process data form sensors using Modbus-TCP based distributed DAQ modules on Windows platform. An IOC is being developed for affecting the necessary control for conditioning of the electrostatic deflector with facility for supervisory intervention. Application of EPICS in sub-systems will lead towards a unified distributed control architecture for auto beam tunning of the machines.  
 
FRAMA01 The Accelerator Activities of the EUROTRANS Programme linac, target, proton, rfq 852
 
  • P. Pierini
    INFN/LASA, Segrate (MI)
  The objective of the EC Integrated Project EUROTRANS is the design and feasibility assessment of an industrial accelerator driven system prototype dedicated to the transmutation of high level waste from nuclear power plants. A part of the program is dedicated to the further development of the high power proton accelerator needed for both the short term experimental demonstrator systems and the long term large scale industrial realizations. In particular the accelerator program addresses the issues of the qualification of the beam reliability with respect to the spallation target requirements, the development of the beam transport line to the subcritical reactor, and the demonstration of the key prototypical components of the proposed linear accelerator. This communication will present an overview and status of the accelerator activities carried out by the partners of the EUROTRANS project.

* On behalf of the Working Package 1.3 (Accelerator) of the EUROTRANS program

 
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