Effect of Skimmer Interaction on the Properties of Partially Condensed Molecular Beams
Abstract
A considerable theoretical and experimental effort has been devoted to the problem of producing high-intensity molecular beams. These beams have been formed by skimming from the supersonic core of a free-jet expansion. Many experimental studies have been devoted to determining the effect of the skimmer upon the molecular beam properties. Through the extensive use of cryopumping in the source, collimation, and test chambers of a molecular beam test facility, it has been possible to identify some of the factors affecting beam intensity in noncondensed and condensed flows. The location of a warm annular surface with inner and outer diameters of 14.5 and 23 cm, respectively, at the cryopumped end wall resulted in a significant attenuation of the incident beam intensity. With the onset of condensation, it has been shown that nonpumping shimmers and end walls reduce the incident beam intensity. Measurements of gas velocity in a condensed flow indicate that a nonpumping surface placed in the beam affects not only beam intensity but also the beam velocity.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1972
- Accession Number
- AD0746292
Entities
People
- A. B. Bailey
- M. R. Busby
- R. Dawbarn
Organizations
- Arnold Engineering Development Complex