HELIUM PUMPING BY 4.2K CRYODEPOSITS
ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFB TN
Pagination or Media Count:
Studies of the trapping of helium by condensing argon on a 4.2K surface indicated that this is an effective method of removing helium from vacuum systems. Pumping speeds as high as 18.3 literssec-sq. cm. for 77K helium converted to 300K helium were obtained. Exploratory tests of nitrogen and oxygen as substrate gases for helium sorption were also carried out. During these tests the capture coefficients of argon, nitrogen, and oxygen were measured and found to be near one.
- Solid State Physics