Determination of critical parameters in the EAST subcooled helium system

The cryogenic system at the Experimental Advanced Superconducting Tokamak (EAST) is designed for a capacity of 1050 W/3.5 K + 200 W/4.5 K + 13 g/s liquid helium+ 13 kW/80 K. The 3.5 K subcooled helium is obtained from an oil ring pump. The cryogenic system is now being upgraded with a centrifugal co...

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Bibliographic Details
Published in:Fusion engineering and design 2018-06, Vol.131, p.84-89
Main Authors: Geng, Maofei, Song, Yuntao, Cheng, Anyi, Feng, Hansheng, Zhang, Qiyong, Jiang, Qingfeng
Format: Article
Language:English
Subjects:
Air compressors
Anchors
Centrifugal compressors
Centrifugal pumps
Cold compressor
Cold pressing
Cooling
Cryogenic
Cryogenic equipment
Cryopumping
Heat exchange
Heaters
Helium
Liquid helium
Parameters
Subcooled helium
Tip clearance
Tokamak devices
Upgrading
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Summary:The cryogenic system at the Experimental Advanced Superconducting Tokamak (EAST) is designed for a capacity of 1050 W/3.5 K + 200 W/4.5 K + 13 g/s liquid helium+ 13 kW/80 K. The 3.5 K subcooled helium is obtained from an oil ring pump. The cryogenic system is now being upgraded with a centrifugal cold compressor that should reduce the helium-tank pressure and temperature. This article discusses the determination of critical parameters for the cold compressor, including the efficiency of heat exchange, the location of the thermal anchor, and the length of the tip clearance between the impeller and shroud. Developing the centrifugal cold compressor is a significant aspect of the EAST cryogenic system upgrades, and the preliminary tests reported herein demonstrate the promise of the retrofit project.
ISSN:0920-3796
1873-7196
DOI:10.1016/j.fusengdes.2018.04.078