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RISS 인기검색어
- 검색키워드
- 저자 : Ogitsu, T. (검색결과 4 건)
- 무료
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Design Study of Superconducting Transmission Line Magnet for J-PARC MR Upgrade
Ogitsu, Toru,Konaka, Akira,Tomizawa, Masahito,Muto, Ryotaro,Tanaka, Kenichi,Okada, Ryutaro,Taekyung Ki,Dhakarwal, Mukesh IEEE 2017 IEEE transactions on applied superconductivity Vol.27 No.4
<P>In order to enhance the beam efficiency of the J-PARC main ring, installation of a new ring is being considered. The new ring, which can accommodate up to 30-GeV proton beam, enables to operate the fast and slow extractions simultaneously with the maximum throughput. Use of superconducting transmission line magnets is proposed as bending magnets for the new ring. Design study of the magnets has started. This paper reports on the brief concept of the new ring, requirements to the magnets, and the status of the design study.</P>
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Ki, T.,Yoshida, M.,Yang, Y.,Ogitsu, T.,Kimura, N.,Nakamoto, T.,Makida, Y.,Iio, M. Pergamon Press ; Elsevier Science Ltd 2016 INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER - Vol.103 No.-
At J-PARC (Japan Proton Accelerator Research Complex), the COMET (Coherent Muon to Electron Transition) experiment is being prepared. Pion-capture and muon-transport superconducting solenoid magnets will be used to capture pions and transport muons which are produced by pion decays. Since the radiation level is high near the magnets, a cold box and a current lead box, which supply a two-phase forced helium flow and currents to the magnets, will be located apart from the magnets. To connect the cold box and current lead box to the magnets, unique cryogenic transfer tubes that have thermal joints for installing NbTi superconducting lead wires at the insides of the transfer tubes are necessary. The transfer tubes should be able to make the wires thermally stable. In this paper, thermal contact conductance between three round-shaped NbTi/Cu monolith superconducting wires and a rectangular slot in a copper block is measured from 4.5K to 10K in six cases and a concept of a thermal joint is proposed for the unique transfer tube of the muon-transport superconducting solenoid magnet. In the thermal joint, the round-shaped superconducting wires make line contacts with the slot covered with one layer of a Kapton tape. The void volume in the slot is filled with Apiezon N grease. An experimental apparatus that uses liquid helium is utilized for measuring the thermal contact conductance in a sample of the thermal joint. The effect of thermal cycles on the thermal contact conductance is observed. The measured thermal contact conductance is used to determine the length of the thermal joint and the size of the gap between the thermal joints.
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Cryogenic system for COMET experiment at J-PARC
Ki, T.,Yoshida, M.,Yang, Y.,Ogitsu, T.,Iio, M.,Makida, Y.,Okamura, T.,Mihara, S.,Nakamoto, T.,Sugano, M.,Sasaki, K.i. Heywood Co ; Elsevier Science Ltd 2016 Cryogenics Vol.77 No.-
Superconducting conductors and cryogenic refrigeration are key factors in the accelerator science because they enable the production of magnets needed to control and detect the particles under study. In Japan, a system for COMET (Coherent Muon to Electron Transition), which will produce muon beam lines, is under the construction at J-PARC (Japan Proton Accelerator Research Complex). The system consists of three superconducting magnets; the first is a pion-capture solenoid, the second is a muon-transport solenoid, and the third is a detector solenoid. It is necessary to cool down the magnets efficiently using two-phase helium and maintain them securely at 4.5K. For stable cryogenic refrigeration of the magnets, a suitable cooling method, structures, and the irradiation effect on materials should be investigated. In this paper, we focus on the development of an overall cryogenic system for cooling the capture and transport solenoids. A conduction-cooling method is considered for cooling the capture and transport solenoids because of the advantages such as the reduction of total heat load, fewer components, and simplified structure. To supply cryogenic fluids (4.5K liquid helium and 58K gas helium) and currents to the conduction-cooled magnets subjected to high irradiation, cryogenic components (cooling paths in the magnets, transfer tubes, and a current lead box) are developed. Based on the environment of high irradiation, the conditions (temperature and pressure) of helium in cooling paths are estimated, as well as the temperature of the capture magnet. We develop a dynamic model for quench simulation and estimate the maximum pressure in the cooling pipe when the capture magnet quenches. We conclude with a discussion of the next steps and estimated challenges for the cryogenic system.
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Mechanical Analysis of Pion Capture Superconducting Solenoid System for COMET Experiment at J-PARC
Iio, Masami,Yoshida, Makoto,Ye Yang,Taekyung Ki,Okamura, Takahiro,Sasaki, Ken-ichi,Makida, Yasuhiro,Ogitsu, Toru,Mihara, Satoshi,Nakamoto, Tatsushi,Sugano, Michinaka,Terashima, Akio,Kawamata, Hiroshi IEEE 2017 IEEE transactions on applied superconductivity Vol.27 No.4
<P>KEK is currently constructing a long series of superconducting solenoid beamline for the COMET Phase-I experiment at the Hadron facility of J-PARC. The magnet system consists of a 5-T pion capture solenoid, a curved muon transport solenoid, and a large bore detector solenoid. The pion capture solenoid system consists of a large cold mass including four coils with an inner diameter of 1340 mm and a small cold mass including six small coils with an inner diameter of 500 mm. The peak magnetic field on the conductor reaches to 5.4 T at an operation current of 2700 A. This paper presents the design and structural details of a magnet, radiation-resistant coil, cold mass and vacuum vessel, apart from the results of the electromagnetic analysis in two-dimensional (2-D) and 3-D.</P>
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