Record Details

Experimental Investigation of the Distribution of Shock Effects in Regolith Impact Ejecta Using an Ejecta Recovery Chamber
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Author and Affiliation:
Christoffersen, R.(Jacobs Technology, Inc., Houston, TX, United States);
Montes, R.(Jacobs Technology, Inc., Houston, TX, United States);
Cardenas, F.(Jacobs Technology, Inc., Houston, TX, United States);
Cintala, M. J.(NASA Johnson Space Center, Houston, TX, United States)
Abstract: Because the mass-flux of solar system meteoroids is concentrated in the approx. 200 microns size range, small-scale impacts play a key role in driving the space weathering of regoliths on airless bodies. Quantifying this role requires improved data linking the mass, density and velocity of the incoming impactors to the nature of the shock effects produced, with particular emphasis on effects, such as production of impact melt and vapor, that drive the optical changes seen in space weathered regoliths. Of particular importance with regard to space weathering is understanding not only the composition of the shock melt created in small-scale impacts, but also how it is partitioned volumetrically between the local impact site and more widely distributed ejecta. To improve the ability of hypervelocity impact experiments to obtain this type of information, we have developed an enclosed sample target chamber with multiple-geometry interior capture cells for in-situ retention of ejecta from granular targets. A key design objective was to select and test capture cell materials that could meet three requirements: 1) Capture ejecta fragments traveling at various trajectories and velocities away from the impact point, while inducing minimal additional damage relative to the primary shock effects; 2) facilitate follow-up characterization of the ejecta either on or in the cell material by analytical SEM, or ex-situ by microprobe, TEM and other methods; and 3) enable the trajectories of the captured and characterized ejecta to be reconstructed relative to the target.
Publication Date: Mar 21, 2016
Document ID:
20160002649
(Acquired Mar 02, 2016)
Subject Category: GEOPHYSICS; LUNAR AND PLANETARY SCIENCE AND EXPLORATION
Report/Patent Number: JSC-CN-35247
Document Type: Conference Paper
Meeting Information: Lunar and Planetary Science Conference; 47th; 21-25 Mar. 2016; The Woodlands, TX; United States
Meeting Sponsor: Lunar and Planetary Inst.; Houston, TX, United States
Financial Sponsor: NASA Johnson Space Center; Houston, TX, United States
Organization Source: NASA Johnson Space Center; Houston, TX, United States
Description: 2p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright; Distribution as joint owner in the copyright
NASA Terms: EJECTA; HYPERVELOCITY IMPACT; IMPACTORS; METEOROID CONCENTRATION; REGOLITH; SPACE WEATHERING; IMPACT MELTS; SIZE DISTRIBUTION; TRAJECTORIES; DAMAGE; FRAGMENTS; MICROANALYSIS
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