Abstract
The presence of an ample supply of liquid helium in the proposed Intersecting Storage Accelerator (ISABELLE) makes cryosorption pumping very attractive for maintaining a long vacuum chamber below 10-10 Torr. We have investigated, therefore, the behaviour of Linde Type 5 A molecular sieve, bonded to stainless steel panel, at 4.2 and 5 K in the pressure range from 10-11–10-8 Torr. By fitting our experimental data we obtained the constant B for helium and hydrogen in the Dubinin-Radushkevich equation which is used to calculate adsorption isotherms at various temperatures. In particular, we studied the causes of a steeper slope of the isotherms in 10-11 Torr range. Based on the results of this investigation we have designed a cryosorption pump to be operated at 4.8 K inside the superconducting magnet dewars in ISABELLE. The pump contains 120 cm2 of bonded molecular sieve and can adsorb more than 1000 cm3 (STP) of helium while maintaining the pressure below 1×10-10 Torr. Its pumping speed is limited only by the conductance of chevrons.
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