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A cryogenic system which has a capacity of 300 W at 1.75 K, 1000 W at 4 K and 30 kW at 80 K has been operating for more than 10 years. It is used to cool the superconducting toroidal magnet of the TORE SUPRA Tokamak. The 1.75 K refrigeration stage is constituted by 3 HeII saturated baths (cold sources) linked to the 18 HeII pressurized baths of the toroidal coils. The HeII saturated bath pumping system is achieved partly at low temperature by two centrifugal compressors, and partly at room temperature by two oil ring pumps. This pumping system has a very large pumping range characteristic from 0.003 kgs{-1} to 0.040 kgs{-1} and a great operating reliability. The safety devices and protections against quench are peculiar to this system.

Additional information

Authors: GRAVIL B, CEA, CEN Cadarache, Saint-Paul-lez-Durance (FR);JAGER B, CEA, CEN Grenoble (FR)
Bibliographic Reference: Article: Advances in Cryogenic Engineering (1997)
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