Capture coefficients of carbon dioxide and nitrogen gas on a cryogenic cooled surface
Tedeschi, Louis Carmelo
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Capture coefficients of CO- and N were measured on a flat cryopanel. The cryopumping of 300°K CO ©a an 85 °K surface resulted in a capture coefficient of 0.58 while for 300°K N_ on a 33°K surface a coefficient of 0.65 was measured. The pressure drop method employed to measure the above capture coefficients was studied to account for vapor pressure, temperature corrections, and assumptions which must be made in the calculation of the capture coefficient. An analog model of the actual system was capable of predicting system pressure responses. Instrumentation and construction of gaseous helium transfer lines necessary to effect the above measurements are also discussed.
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