RESEARCH STUDY OF CRYOPUMPING WITH A RADIATION SHIELDED CONDENSER
Abstract
This report includes: National Research Corp., Cambridge, Mass. INSTRUMENTATION ASSISTANCE TO ARTHUR D. LITTLE, INC. RE: CRYOPUMPING RESEARCH INVESTIGATION. Summary rept., by John C. Simons, Jr. 14 July 1961. (Subcontract to Little, Arthur D., Inc., Cambridge, Mass., Contract AF 40(600)-899) The purpose of this study was to develop information for the empirical design of a cryopumping array. Experiments with a chevron-shielded condenser have been carried out and, where possible, the results correlated with analysis. An array constructed from aluminum panels proved to be very serviceable. The greatest transmission of radiation through the chevrons to the condenser occurred with a CO2 deposit on the chevrons and a nitrogen deposit on the condenser, and with infrared radiation incident on the inlet to the array. Even under these conditions less than 2 percent of the incident irradiation was transmitted to the condenser. It was concluded that cryopumping by means of a condenser at 20 deg K, radiation shielded by surfaces cooled to 77 to 100 deg K, can provide effective means for removal of nitrogen and all less volatile gases from a vacuum space in the ultra-high vacuum range.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1962
- Accession Number
- AD0273739
Entities
People
- Raymond W. Moore Jr.
Organizations
- Arthur D. Little