Present status and one upgrading method with a cold compressor of the EAST sub-cooling helium cryogenic system

Zhigang ZHU (朱志刚); Qiyong ZHANG (张启勇); Yuntao SONG (宋云涛); Ming ZHUANG (庄明); Zhiwei ZHOU (周芷伟); Anyi CHENG (成安义); Ping ZHU (朱平)

doi:10.1088/2058-6272/aa58da

Plasma Science and Technology > 2017 > 19(5): 55603-055603. > DOI: 10.1088/2058-6272/aa58da

Zhigang ZHU (朱志刚), Qiyong ZHANG (张启勇), Yuntao SONG (宋云涛), Ming ZHUANG (庄明), Zhiwei ZHOU (周芷伟), Anyi CHENG (成安义), Ping ZHU (朱平). Present status and one upgrading method with a cold compressor of the EAST sub-cooling helium cryogenic system[J]. Plasma Science and Technology, 2017, 19(5): 55603-055603. DOI: 10.1088/2058-6272/aa58da

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Present status and one upgrading method with a cold compressor of the EAST sub-cooling helium cryogenic system

1 Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People’s Republic of China 2 University of Science and Technology of China, Hefei 230026, People’s Republic of China

Funds: This work is supported by National Natural Science Foundation of China (No. 11505237).

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Received Date: September 05, 2016

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Abstract

Abstract

Since 2006, the superconducting toroidal field (TF) coils of the Experimental Advanced Superconducting Tokomak (EAST) have been successfully cooled by supercritical helium at a temperature of 4.5 K and a pressure of 4 bara in eleven experiments. To obtain higher operating currents and magnetic fields it is necessary to lower the operating temperature of the TF coils. The EAST sub-cooling helium cryogenic system, with a warm oil ring pump (ORP), was tested twice in cool-down experiments, which made the TF coils operate at 3.8 K. However, the long term operational stability of the sub-cooling system cannot be guaranteed because of the ORP’s poor mechanical and control performance. In this paper, the present status of the EAST sub-cooling helium cryogenic system is described, and then several cooling methods below 4.2 K and their merits are presented and analyzed. Finally, an upgrading method with a cold compressor for an EAST sub-cooling helium cryogenic system is proposed. The new process flow and thermodynamic calculation of the sub-cooling helium system, and the main parameters of the cold compressor, are also presented in detail. This work will provide a reference for the future upgrading of the sub-cooling helium system for higher operation parameters of the EAST device.
- EAST,
- cryogenic system,
- helium refrigerator,
- sub-cooling helium,
- cold compressor

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References (17)

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