Abstract
A new 38.5-ft-diam spherical vacuum chamber with a selective pumping system has just been completed. The pumping system for this 800 000 liter chamber consists of mechanical roughing, 80 K liquid-nitrogen-cooled shroud, 20 K cryopanels, and ion and titanium sublimation pumps. The chamber and pumping system are described. Extensive acceptance tests were run on the chamber. These tests included pumping speed measurements and ultimate pressure measurements with various combinations of the pumping units operating. Data on the outgassing of the 5 000 000-cm2 stainless-steel shell is presented. From residual gas analysis, approximate pumping speeds for helium and neon were determined. At ultimate pressure of the chamber, water vapor outgassing from the stainless-steel shell was found to be the limiting factor.
Published Version
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