Hyperthermal Atomic Beam Concentrators for Aerospace Applications

Details Hyperthermal Atomic Beam Concentrators for Aerospace Applications Hyperthermal Atomic Beam Concentrators for Aerospace Applications

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1084..606y&link_type=abstract

RARIFIED GAS DYNAMICS: Proceedings of the 26th International Symposium on Rarified Gas Dynamics. AIP Conference Proceedings, Vol

Astronomy and Astrophysics

Astrophysics

Chemical Reactions, Energy Disposal, And Angular Distribution, As Studied By Atomic And Molecular Beams, Spacecraft/Atmosphere Interactions, Fundamental Aspects Of Astrophysics

Scientific paper

For the high-fluence atomic oxygen exposure tests, we have investigated atomic oxygen concentration technology. Based upon the previous results relating material selection or shape of the reflecting surface, two types of concentrators were designed. One is ``horn-type'' and the other is ``multiple ring-type'' concentrator. Both of them were designed with a computer simulation using the hard cube model. It was made clear that the primary factor for limiting the concentration factor is the gas build-up near the focal point. In the ground test using laser detonation source, the concentration factor of 2-3, which is lower than the theoretical expectations, was measured. It was suggested that the low concentration factor was due to the recombination reaction of atomic oxygen into molecular oxygen by the high peak flux in the pulsed atomic oxygen beam. The flux-limit of concentration factor is not a case in real low Earth orbit space environment, and the ``multiple ring-type'' concentrator can be expected to obtain the concentration factor over 40 in low Earth orbit exposure condition.

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