Study of High-Energy Gases Impinging on Various Cryosurfaces
Abstract
A study of the interaction of high-energy molecular beams with various cryosurfaces was conducted in a molecular beam test facility. Spatial distributions of the reflected flux from several samples of typical engineering surfaces showed near-cosine distributions with some evidence of back scattering for roughened surfaces. For high-energy beams and highly polished surfaces there was a well-defined forward lobe of reflected molecules. Energy accommodation coefficients were determined by measuring the velocity of the reflected molecules. For all engineering surfaces tested the high-energy gases can be considered fully accommodated after one collision. Pumping studies of hydrogen (H2) on liquid-helium (LHe)-cooled cryosurfaces were conducted.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1972
- Accession Number
- AD0740548
Entities
People
- M. Kinslow
- M. R. Busby
- R. Dawbarn
Organizations
- Arnold Engineering Development Complex