Fundamental studies for the application of quench protection systems based on an active power method for cryocooled LTS coils |
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| Authors: | Kazuya Takeuchi Nozomu Nanato Satoru Murase SeokBeom Kim Gen Nishijima Kazuo Watanabe Takao Takeuchi Nobuya Banno Akihiro Kikuchi |
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| Affiliation: | 1. Division of Electronic and Information Systems Engineering, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima Naka, Okayama 700-8530, Japan;2. Division of Industrial Innovation Sciences, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima Naka, Okayama 700-8530, Japan;3. High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 900-8577, Japan;4. Superconducting Materials National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan;1. School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, China;2. Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou 510275, China;1. Applied Research Laboratory, KEK (High Energy Accelerator Research Organization), 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan;2. Institute of Particle and Nuclear Studies, KEK (High Energy Accelerator Research Organization), 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan;3. Department of Applied Quantum Physics and Nuclear Engineering, Kyushu University, 744 Motooka, Nishi-Ku, Fukuoka 819-0395, Japan;1. Department of Accelerator and Medical Physics, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan;2. Accelerator Engineering Corporation, 3-8-5 Konakadai, Inage-ku, Chiba 263-0043, Japan;1. Japan Atomic Energy Agency, Rokkasho, Aomori 039-3212, Japan;2. Japan Atomic Energy Agency, Naka, Ibaraki 311-0193, Japan;3. Toshiba Nuclear Engineering Services Co., Isogo, Yokohama 25-8523, Japan;4. Graduate School of Engineering, Nagoya Univ., Nagoya 464-8603, Japan |
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| Abstract: | When the quenching occurs in a superconducting coil, excessive joule heating in normal area may damage the coil. It is necessary to detect quenching in the coil as soon as possible and discharge the magnetic energy stored in the coil. Therefore, we propose a superconducting coil protection system based on an active power method. The system is highly resistant to the noise and does not require cancel voltage taps, so it is useful for both AC and DC coils. We have presented the effectiveness of the system using some test coils cooled in LN2 or LHe. However, we have not discussed the effectiveness of the proposed system for helium-free cryocooled magnets, in which a larger temperature rise occurs after quenching than in liquid-cooled magnets. In this paper, we verify the effectiveness and practicality of the proposed system through coil protection tests for a cryocooled Nb3Al LTS coil. |
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