Hypervelocity particle impact studies performed on a gold-coated beryllium substrate mirror

Details Hypervelocity particle impact studies performed on a gold-coated beryllium substrate mirror Hypervelocity particle impact studies performed on a gold-coated beryllium substrate mirror

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004spie.5487.1100h&link_type=abstract

Optical, Infrared, and Millimeter Space Telescopes. Edited by Mather, John C. Proceedings of the SPIE, Volume 5487, pp. 1100-

Mathematics

Scientific paper

This paper presents the results of the hypervelocity projectile bombardment of a gold-coated beryllium substrate telescope mirror. Individual latex (ρ = 1.1 g/cm3) and iron (7.9 g/cm3) projectiles, in the size range 0.70 to 1.44μm (avg. mass = 0.24 - 7.1 x 10-15 kg), representative of interplanetary dust, with velocities from 2 - 20 km/s, created impact craters in the composite mirror structure that were approximate hemispheres. The ratio of impact damage diameter to projectile energy was found experimentally to be close to 0.1μm/nJ for both latex and iron projectiles. These dimension data, combined with recent measurements of interplanetary and interstellar dust fluxes, can be used to estimate expected space telescope mirror surface damage and scattering increase due to hypervelocity dust impacts.

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