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| TUPMA015 | Radiation Safety Considerations of the Operation of INDUS-1 Synchrotron Radiation Source | radiation, photon, storage-ring, synchrotron | 121 | ||||
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Radiological safety aspects of the operation of the electron storage ring, Indus-1 (450 MeV, 100 mA) is described in the paper. The ring is provided with a modular hybrid shielding comprising of mild steel and lead through which synchrotron radiation (SR) beam lines pass out. During the commissioning phase several radiation protection problems like streaming of high-energy bremsstrahlung x-rays, through front ends of SR beam lines, shield joints, its detection and containment were encountered. Experimental measurements on the response of conventional radiation monitors with respect to water phantom were then carried out to evaluate the dose build up factors in the streaming high-energy radiation field. The studies lead to the deduction of correction factors for the monitors for use in Indus-1. Improvement in monitor response on account of spectral degradation through shield and radiation levels during accidental beam loss are other problems, which are evaluated. Details of the radiation protection programme, radiation physics studies, the current status of radiation levels and access control are presented.
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| THC2MA01 | Design of The PEFP Low Beta Cryomodule | vacuum, controls, linac, radiation | 564 | ||||
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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.
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*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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| THC3H101 | Status of the Industrial RF-accelerators in BINP | electron, extraction, vacuum, coupling | 622 | ||||
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ILU type of industrial RF accelerators developed and producing in BINP involve the energy range from 0.5 to 5 MeV with power up to 50 kWt. Compact size of this type of the accelerators and no necessity of SF6 allows to use their in the wide spectrum of technology, including the food and drug treatment. Described the status of the novel ILU-12 accelerator with energy up to 5 MeV and power up to 300 kWt. BINP developed series of X-ray converters based on tantalum and wolfram targets. The family of ILU accelerators includes the ion accelerator ILU-9. This report involves the new radiation technologies which use ILU type of accelerators, based on e-beam, X-ray and ion beams.
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| THPMA016 | Median Plane Magnetic Field Mapping for Superconducting Cyclotron (SCC) in VECC | controls, cyclotron, monitoring, extraction | 652 | ||||
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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.
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| THPMA051 | Cure of Temperature Fluctuations on the Nitrogen-cooled Sections of a CESR-type SRF Module | controls, vacuum, storage-ring, superconducting-RF | 700 | ||||
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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.
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| THPMA078 | Wideband Current Transformers for the Surveillance of the Beam Extraction Kicker System of the Large Hadron Collider | extraction, kicker, collider, beam-losses | 746 | ||||
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The LHC beam dumping system must protect the LHC machine from damage by reliably and safely extracting and absorbing the circulating beams when requested. Two sets of 15 extraction kicker magnets form the main active part of this system. A separate high voltage pulse generator powers each magnet. Because many failures are deemed catastrophic, the magnets and generators are continuously surveyed in order to generate a failsafe beam abort as soon as an internal fault is detected. Amongst these surveillance systems, wideband current transformers have been designed to detect any erratic starts in one of the generators. The current transformers were developed in collaboration with industry. To minimize losses, high-resistivity cobalt alloy was chosen for the cores. The annealing techniques originally developed for LEP beam current measurement in collaboration between CERN and industry allowed to extend the frequency response beyond that of traditional core materials. The paper shows the results obtained, exposes the problems encountered with shielding, conductor position sensitivity, load resistor technology and their solutions.
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