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monitoring

  
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MOOPMA01 Challenges in ILC SCRF Technology superconductivity, linear-collider, controls, 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.  
slides icon Slides
 
MOOPMA04 Crab Cavity Development vacuum, superconductivity, luminosity, dipole 36
 
  • Y. Morita, K. Akai, K. Ebihara, T. Furuya, K. Hara, T. Honma, K. Hosoyama, A. Kabe, Y. Kojima, S. Mitsunobu, H. Nakai, K. Nakanishi, M. Ono, Y. Yamamoto
    KEK, Ibaraki
  • T. Kanekiyo
    Hitachi Ltd., Hitachi Research Laboratory, Ibaraki-ken
  • K. Okubo, K. Sennyu
    MHI, Kobe
  • M. M. Rahman
    University of Chittagong, Chittagong
  Tow superconducting crab cavities, witch will be installed in the KEKB accelerator, is being assembled. The KEKB (KEK B-factory) is a double-ring, asymmetric-energy, high luminosity electron-positron colliding accelerator with a finite angle beam crossing. A purpose of the crab cavities is to deflect the beam-bunch with time-varying RF fields, and to provide the head-on collision at the interaction point (crab crossing scheme). The head-on collision will drastically increase luminosity. The crab cavity is required to have high RF fields (kick voltage) to provide beam-bunch deflection. This mode (crab mode, 509 MHz) is not the lowest order mode (LOM) of the cavity. In order to damp the LOM as well as the HOMs, a coaxial coupler is attached along the beam pipe. Two crab cavities have been fabricated and tested in a vertical cryostat. These cavities have already achieved the required kick voltage. One cavity was recently tested with high RF power in a cryomodule. After some conditioning, this cavity has achieved the required kick voltage. The test revealed some modifications were needed. After improvements, the cavity will be ready for installation.  
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TUPMA008 Status of the VEPP-4M Electron-Positron Collider lepton, luminosity, collider, controls 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.  
 
TUPMA032 Radiation Safety System for INDUS Accelerator Complex radiation, controls, 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.  
 
WEPMA075 Improvement of Web-Based Monitoring of EPICS-IOC for PAL Control System controls, 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 controls, 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 controls, power-supply, linac, 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.

 
 
WEPMA087 Control System for Beam Diagnostic System of Indus-2 controls, diagnostics, electron, 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 controls, cyclotron, instrumentation, 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.  
 
THC2MA02 Experiences with the Manufacturing, Testing and Quality Control of Large Number of Superconducting Magnets controls, cryogenics, sextupole, 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.  
 
THPMA016 Median Plane Magnetic Field Mapping for Superconducting Cyclotron (SCC) in VECC controls, cyclotron, 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.  
 
THPMA017 Mathematical Model for Fast and Slow Dumping of K-500 Superconducting Cyclotron Magnet dumping, cyclotron, power-supply, vacuum 655
 
  • A. De, S. Saha, S. K. Thakur
    DAE/VECC, Calcutta
  A superconducting cyclotron (K-500) is under construction at Variable Energy Cyclotron Centre. Two superconducting coils ' named 'Alpha' and 'Beta' ' generates the main magnetic field of the cyclotron. Subsequent to the in-house fabrication of the two coils, it was assembled into the cryostat and the magnet assembly completed. Immediately after the cool down, the superconducting coils were energized. Two dump resistors ' slow and fast ' serve to dissipate the energy stored in the coils externally depending upon the situation. Various sets of data were collected during these dumping conditions and based on these an approximate mathematical model was constructed to simulate the dumping characteristics. This model took into account the lead drops, the cable and the joint resistances along with the dump resistor values and the self and mutual inductances (that varied with current) of the coil.  
 
THPMA028 Regulation Scheme for Precision Magnet Power Supply power-supply, feedback, controls, antiproton 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.  
 
THPMA130 Introduction of EPICS in VEC & SCC Control Systems controls, power-supply, 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.