Accession Number : AD0282904

Title :   TRAPPING AND SORPTION OF NONCONDENSABLE GASES IN THE COLD DIFFUSION PUMP

Corporate Author : ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AIR FORCE STATION TENN

Personal Author(s) : NICHOLS,J.E.

Report Date : AUG 1962

Pagination or Media Count : 1

Abstract : Continuing research on an experimental cryogenic diffusion pump as a vacuum pumping device is described with special emphasis on the effects of trapping and adsorption. By the use of pumping fluids that have large trapping capacities, it was possible to pump N2 gas with the cold diffusion pump without a forepump while the condensing wall was at liquid nitrogen temperature. The pumping speeds for this system, with and without a forepump, are presented, using H2O and CCl4 as pumping fluids and N2 as the test gas. The trapping of hydrogen and helium by water at 77 K was not observed experimentally. (Author)

Descriptors :   *DIFFUSION PUMPS, ADSORPTION, CARBON TETRACHLORIDE, CRYOGENICS, NITROGEN, VACUUM APPARATUS, WATER

Distribution Statement : APPROVED FOR PUBLIC RELEASE