Hypervelocity experiments for sample return missions using silica aerogels as capture media

Abstract

We report on our hypervelocity capture experiments for sample return missions using silica aerogels as capture media. Since aerogels are excellent thermal insulator, there is a possibility that samples might be thermally altered upon capturing. Thus empirical simulation in the lab is essential for rigorous examination of the captured samples. We fired hydrated phyllosilicate mineral particles which were susceptible to heat into aerogel by using two-stage light gas guns. After extraction from aerogel, several kinds of analyses were given to the samples to evaluate their alteration. We introduce results of our previous studies as well as those of preliminary experiments for TANPOPO mission.