Physics – Optics
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981hpfp.rept.....h&link_type=abstract
Helium purge flow prevention of atmospheric contamination of the cryogenically cooled optics of orbiting infrared telescopes: C
Physics
Optics
Contaminants, Cryogenic Cooling, Helium, Infrared Telescopes, Oxygen, Purging, Collisions, Elastic Scattering, Monte Carlo Method, Scattering Cross Sections
Scientific paper
The ability of an He purge gas to protect the cryogenically cooled optics of orbiting infrared telescopes from the primary atmospheric contaminant, atomic oxygen, can be estimated by Monte Carlo calculations simulating the He-O scattering events that would occur in the operating telescope. The results of accurate quantum mechanical calculations of the He-O differential cross sections needed in such Monte Carlo calculations are reported. In order to facilitate the use of these cross sections in Monte Carlo calculations, a simple separable function of E and theta was constructed which provides an adequate representation of sigma(theta, E) for the entire range of relative collision energies studied, F = 0.02 to 1.66 eV. For high relative collision energies, the accuracy of the computationally simpler WKB approximation was also tested.
Harvey N. M.
Herm Ronald R.
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