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| MOOPMA02 | Overview of Regional Infrastructure for SCRF Development | collider, linac, controls, linear-collider | 31 | ||||
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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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| TUXMA01 | LHC Status | dipole, quadrupole, injection, insertion | 46 | ||||
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The installation of the Large Hadron Collider at CERN is now approaching completion. Almost 1100 of the 1232 main bending magnets are installed and the whole ring will be installed by the end of March 2007. Emphasis is now moving from installation to commissioning, with the cool down of the first of the 8 sectors to liquid helium temperature well underway. In the other sectors, interconnect work is proceeding at a satisfactory pace and will be finished by the end of August. It is foreseen to inject the first beam into the LHC in November with the objective of having first collisions at the injection energy (450 GeV/c) in order to debug the machine and detectors before stopping for the annual winter shutdown. During this time, the detector installation will be finished and the machine will be pushed to full current ready for the first physics run at 7 TeV per beam in 2008.
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| TUZMA02 | Operation for LHC Cryomagnet Tests: Concerns, Challenges & Successful Collaboration | dipole, superconducting-magnet, target, controls | 84 | ||||
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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, vacuum, alignment, controls | 103 | ||||
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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.
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| WEXMA02 | The BEPCII: Construction and Initial Commissioning | linac, luminosity, positron, vacuum | 285 | ||||
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As a natural extension of the Beijing Electron-Positron Collider (BEPC), the BEPCII project has started its construction since the beginning of 2004. The BEPCII will operate in beam energy of 1-2.1 GeV, its design luminosity is 1*1033cm-2s-1 at 1.89 GeV with double-ring structure. The upgraded collider will also serve as a synchrotron radiation source with higher beam energy and intensity than the BEPC. Some key technologies, such as superconducting RF system, low impedance vacuum devices, superconducting micro-beta quadrupoles, etc. are developed. The injector linac reached its design specification by the summer of 2006. Most storage ring components have been manufactured, installed and tested. The final checkout of the storage ring subsystems is underway. For the delay of the cryogenic and high current test of the superconducting quadrupoles, the commissioning of the storage rings will be started with normal magnets in the interaction region in autumn of 2006. The project is scheduled to complete in 2008. This paper will present the updated status and preliminary commissioning results of the BEPCII.
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* For the BEPCII team |
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| WEZMA04 | Superconducting Cyclotron Project at VECC | cyclotron, extraction, injection, controls | 320 | ||||
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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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| WEPMA077 | Monitor and Archive System of Instrumentation | controls, monitoring, instrumentation, synchrotron | 431 | ||||
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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.
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| WEPMA090 | Status of the Superconducting Insertion Devices Control System at TLS | power-supply, controls, insertion, insertion-device | 455 | ||||
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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.
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| WEPMA124 | Preliminary Design, Analysis and Manufacturing Aspects of Low Beta 350 MHz Reentrant Superconducting RF Cavity | linac, rfq, proton, beam-transport | 497 | ||||
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A superconducting reentrant cavity for low beta, high intensity beam has been designed using SUPERFISH and MAFIA. The study has been done for cavity shape optimization considering the minimization of surface fields. Further its structural design has been done and feasibility study of different manufacturing aspects has also been done. A full-scale mild steel model with copper coating has been fabricated. A twin arm mechanical tuner has been designed for slow tuning by elastic deformation. This was tested with low power RF to validate the design parameters and to check the tuning sensitivity. In this paper the design and development activity of the reentrant superconducting will be discussed
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| THYMA03 | Commissioning Experience of Superconducting Radio Frequency Systems for the Taiwan Light Source | vacuum, synchrotron, feedback, photon | 549 | ||||
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An industrially manufactured CESR-type SRF module has been routinely operated at the Taiwan Light Source (TLS) at the National Synchrotron Radiation Research Center (NSRRC) since the beginning of March 2005. The original goals of doubling the electron beam current to increase the synchrotron light intensity and of eliminating the instability caused by the interaction of the electron beams with the cavity's higher-order modes have been successfully demonstrated. The greatest challenge to the operational reliability is the shortness of the mean time between failures, and has been successfully overcome. This work reports the commissioning experience of the SRF module at TLS for high beam-current operation toward a maximum beam current of 400 mA in top-up mode from 200 mA in decay mode over last two years. Emphasized will be the instrument development for analysis of SRF trip event and the continuous improvements of the operating analogous low-level rf system against instability of feed back loops caused by heavy beam loading.
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| THC2MA02 | Experiences with the Manufacturing, Testing and Quality Control of Large Number of Superconducting Magnets | controls, sextupole, monitoring, dipole | 567 | ||||
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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.
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| THPMA050 | Performance of Cryomodule and Cryogenic Network System for the Superconducting Linac at IUAC. Delhi | linac, vacuum, ion, booster | 697 | ||||
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The Superconducting Linear Accelerator as a booster of existing 15 UD Pelletron accelerator is under construction at IUAC. The heart of superconducting linac is three cryomodules, each one housing eight quarter wave niobium cavities. At present the first linac module along with superbuncher and rebuncher cryostat are integrated with zero degree beam line. Design and fabrication of two more linac modules under progress. A VME based CRYO-DACS has been developed to monitor and control parameters of cryostat. The total load at 4.2 K for complete system including locally developed liquid helium distribution line as well as break up load for each cryomodules has been measured. The measured load in linac module is higher than the design value. A detailed thermal analysis has been carried out using temperature profile for each component of cryomodules. Extra load is mainly contributed by aluminum structure,drive coupler and additional radiation load. The present paper will be highlighting the operating experience on cool down of linac as well as thermal performance of each cryo module. Scope of improvement on future linac cryo module to reduce the static load will also be covered.
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| THPMA130 | Introduction of EPICS in VEC & SCC Control Systems | controls, power-supply, monitoring, simulation | 827 | ||||
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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.
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