Calculated and Observed Pumping Speeds of a Shielded Cryogenic Pumping Surface
The design of cryogenic pumping systems for large space environment simulators involves a trade-off between refrigeration capacity requirement and pumping performance. The low-temperature (about 20°K) surfaces needed to condense nitrogen and oxygen must be shielded from thermal radiation to minimize the load on their refrigeration system, but the shielding surfaces also cause a significant reduction in pumping capability, as measured by the pumping speed of the system for “permanent” gases.
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