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- W4256376401 abstract "The 3.7 m bubble chamber, at present under construction for CERN, will hold 33.5 m3 of liquid hydrogen and work in a field of 3.5 T. For cooldown and operation of the chamber and its superconducting magnet, a compound helium/hydrogen refrigeration plant has been chosen which has to fulfil, under normal operating conditions, the following cooling requirements: at 4.4 K − 1.5 kW and 2.5 g liq He s−1 − at 22 K – 25 kW. Special attention had to be paid to the cool down of the magnet, in order to minimize the thermal stresses in the magnet and its containers. In this paper a description of the plant flow diagram is given. No cooling machinery is built into the hydrogen cycle; such machinery being concentrated on the helium side, where two pairs of high-speed oil-lubricated turbines are installed. The helium circuit is a modified Claude cycle, precooled by Stirling cycle machines. It produces the cold for the helium side, and also provides precooling for the hydrogen circuit, which is a simple Joule-Thomson cycle, precooled at approximately 80 and 40 K. The different modes of operation of the plant when used for cooldown and liquefaction, as well as the possibilities of emergency operation, are discussed and the advantages of the compound system are explained." @default.
- W4256376401 created "2022-05-12" @default.
- W4256376401 date "1974-02-01" @default.
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- W4256376401 title "Research news" @default.
- W4256376401 doi "https://doi.org/10.1016/0011-2275(74)90247-1" @default.
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