Measurement of the Lowest Pressures in Space and the Laboratory
GEOPHYSICS CORP OF AMERICA BEDFORD MA
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A description is given of the design, construction and operational characteristics of two demountable, metal ultra high vacuum systems, a mercury diffusion pump system and a combination liquid helium cryopumpion pump system. The diffusion pump system attained pressures as low as 10exp -l3 torr and was used for low pressure vacuum gauge calibration. The liquid helium cryopump system reached pressures in the low 10exp -11 torr region with only limited bake outs and exhibited a clean residual gas mass spectrum. The two systems were studied to determine their low pressure limitations and sources of residual gas.
- Inorganic Chemistry
- Pumps, Filters, Pipes, Tubing, Fittings and Valves