低温工学
Online ISSN : 1880-0408
Print ISSN : 0389-2441
ISSN-L : 0389-2441
研究論文
JT-60SA 用ヘリウム冷凍システム ―コイル通電試験における熱性能評価―
濱田 一弥福井 良磨河野 勝巳夏目 恭平大西 祥広大都 起一MICHEL FredericHOA ChristineWANNER Manfred
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2021 年 56 巻 4 号 p. 215-221

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The JT-60SA cryogenic system with a refrigeration capacity of 9.5 kW at 4.5 K consists of Refrigerator Cold Box (RCB) and Auxiliary Cold Box(ACB). The RCB provides cold helium to the ACB, high-temperature superconductor current leads, and an 80 K thermal shield. The ACB supplies supercritical helium at 4.4 K / 0.5 MPa by cold helium circulation pumps to a superconducting magnet system through the heat exchangers in a liquid helium tank. In a tokamak type fusion device, superconducting coils, CS and EF, are operated as dynamically controlling their transport currents to sustain plasma operation. Hence the heat load variations caused by AC losses could disturb the operation of the cryogenic system. The JT-60SA cryogenic system has an active control mechanism to mitigate a substantial dynamic of heat load for the stable operation of the warm helium compressors and turbines. During the commissioning of the cryogenic system, the active control mechanism demonstrated a stable operation of the cryogenic system. A cool-down operation of the cryogenic system started in October 2020. This paper reports the specifications of the cryogenic system, a result from a control test for variable heat load, and thermal analysis result at toroidal field coil operation.

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© 2021 公益社団法人 低温工学・超電導学会 (旧 社団法人 低温工学協会)
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