会議発表用資料 Commissioning of the JT-60SA helium refrigerator

神谷, 宏治  ,  Kamiya, Koji  ,  夏目, 恭平  ,  Natsume  ,  大都, 起一  ,  大石, 誠  ,  本田, 敦  ,  柏, 好敏  ,  木津, 要  ,  小出, 芳彦  ,  hoa, christine  ,  Michel, Frederic  ,  Roussel, Pascal  ,  Lamaison, Valerie  ,  Bonne, Francois  ,  DiPietro, Enrico  ,  Cardella, Antonino  ,  Wanner, Manfred  ,  Legrand, Jerome  ,  Langevin, Baptiste  ,  Pudys, Vincent

2016-11-08
内容記述
The JT-60U is being upgraded to a full-superconducting tokamak referred as the JT-60 Super Advanced (JT-60SA) as one of the JA-EU broader approach projects. The JT-60SA project will use superconducting magnets to confine the plasma and achieve a plasma current with a typical flat top duration of 100 second in purely inductive mode. The helium refrigerator provides 4.4 K, 50 K, and 80 K for the superconducting magnets, the HTS current leads, and the thermal shields, respectively. In addition 3.7 K helium is provided for the divertor cryo-pumps. The refrigerator consists of warm compressors, a refrigeration cold box, an auxiliary cold box and LN2 and GHe storages. It will provide a total equivalent cooling power of about 9 kW at 4.5 K. A major features of the JT-60SA refrigerator is its capability to handle large transient heat pulses by utilizing a 7m3 liquid helium buffer. The helium bath absorbs the pulse heat by a temporary temperature increase and subsequent vaporization of helium liquid. After the pulse, the refrigerator starts liquefying to recover the liquid level to the original for the next pulse.The JT-60SA helium refrigerator was contributed by CEA, France. The plant was manufactured and installed in Naka Fusion institute by Air Liquid Advanced Technology, France in September 2015. The commissioning started in October 2015 and has been finished in October 2016. During the commissioning the followings operations were tested; automatic cool-down and warm-up, automatic purification, the total cooling capacity, stable operation in the short stand-by (STS) and baking (BAK) mode, nominal pulse modes and quench sequence, regeneration sequence of the divertor cryopanels. During commissioning, also automatic transition between several defined stationary modes, such as STS mode and BAK mode have been validated. Details of the commissioning will be reported in the conference.
1st Asian ICMC and CSSJ 50th Anniversary Conference

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