High Velocity Van-de-Graff Shots with Mineral Dust: An Application for Stardust and Other In-situ Space Missions

Details High Velocity Van-de-Graff Shots with Mineral Dust: An Application for Stardust and Other In-situ Space Missions High Velocity Van-de-Graff Shots with Mineral Dust: An Application for Stardust and Other In-situ Space Missions

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....41.3714s&link_type=abstract

American Astronomical Society, DPS meeting #41, #37.14

Astronomy and Astrophysics

Astronomy

Scientific paper

The detection and collection of high velocity interplanetary or interstellar dust grains by space missions is a challeging task, as high speed impacts on collectors or detectors may cause significant structural and chemical modification. Simulation of high speed dust impacts is required, e.g. into STARDUST aerogel or foils, or impact ionisation time-of-flight mass spectrometers as onboard CASSINI. Particle speeds up to 50 km/sec can only be achieved by the dust accelerator operated at MPIK (Heidelberg). A thin platinum coating was successfully applied to analogue material like silicates (quartz, orthopyroxene, anorthite, olivine, talkum), and carbon rich particles (silicon carbide). Organic and sulfide (e.g. pyrrhotite) grains can be coated with a thin conductive layer of polypyrrole. All coated grains were successfully accelerated and provided impacts with speeds between 1 - 40 km/s. Impact signals as well as high resolution impact ionisation mass spectra were evaluated using the large area mass analyzer (LAMA). Shots into Stardust flight spare tiles have been extracted in picokeystones. Quantiative measurements of the alteration of othopyroxene grains in residues of individual 1 pg impactors have been obtained, demonstrating the suitability of this method of sample preparation and analysis for future dust samples returned by the STARDUST mission.

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