CRYOPUMPING OF 77 K NITROGEN AND ARGON ON 10-25 DEGREES K SURFACES
ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFS TN
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Results are presented on the first phase of an experimental program designed to study the effects of gas and cryosurface temperatures on the capture coefficient in cryopumping. Experimental pumping speeds and capture coefficients were obtained for 77 K nitrogen and argon on a spherical cryosurface with tem peratures ranging from 10 to 25 K. The capture coefficients for the two gases were found to follow exponential functions of the cryosurface temperature. These functions were found to be similar to the Boltzmann distribution law.