Velocity Measurements of Impact Ejecta from Regolith Targets

Details Velocity Measurements of Impact Ejecta from Regolith Targets Velocity Measurements of Impact Ejecta from Regolith Targets

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997icar..128..160y&link_type=abstract

Icarus, Volume 128, Issue 1, pp. 160-170.

Computer Science

17

Scientific paper

We performed new experiments with impacts on regolith-like layers of glass spheres to investigate the spatial and velocity distributions of ejecta with velocities higher than several hundred m sec^-1. Spherical nylon projectiles of 7.0 mm diameter were accelerated to about 4 km sec^-1 using a two-stage light-gas gun. The ejecta were detected by thin Al foil targets of different thickness, and the resulting holes on the foil were counted to derive the velocity distribution using an empirical threshold penetration formula. The spatial distribution of the ejecta was also derived from the analysis of the position of the penetration holes. The high velocity ejecta were concentrated toward the downrange azimuth of the impacting projectile because of the oblique impacts of the projectiles into the targets. In order to estimate the total volume of ejecta with velocity higher than a given velocity, the measured spatial distributions were extrapolated to regions where no Al targets were exposed. The results were compared to a scaling formula based on low velocity data of the ejecta from sand targets. Though our results on the volume of ejecta with higher velocity lie below the extrapolation of the lower velocity data, the differences were within about one order of magnitude.

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