Experimental studies of impact ionisation

Details Experimental studies of impact ionisation Experimental studies of impact ionisation

May 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981esasp.155...81g&link_type=abstract

In ESA The Comet Halley Probe. Plasma Environ. p 81-90 (SEE N81-34113 24-88)

Physics

4

Hypervelocity Impact, Impact Tests, Ion Impact, Ionization, Space Probes, Cosmic Dust, Flyby Missions, Gold, Halley'S Comet, Hypervelocity Projectiles, Iron, Spacecraft Charging

Scientific paper

Impact experiments for establishing the effects of impact ionization at hypervelocities are reviewed. These experiments simulate the situation of the Halley probe when it will penetrate the cometary coma and when it will be exposed to cometary dust at an impact speed of 57 km/s. The total yield of the impact charge Q (of both polarities) for a gold target at an impact speed of 57 km/s is given by Q = c m with c = 800 Coulombs/gram and m being the projectile mass. The uncertainty due to the unkown projectile material is within a factor of 3 for the given relation. The mean energy of the ions is 2eV at an impact speed of 10 km/s. An experiment which simulates the charging of a test body by impact ionization shows an equilibrium potential or = 10 V (i.e., the collected positive and negative charges are balanced) for projectiles impacting at 20 km/s.

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