Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufm.p13d1718c&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #P13D-1718
Physics
[6015] Planetary Sciences: Comets And Small Bodies / Dust, [6213] Planetary Sciences: Solar System Objects / Dust, [6250] Planetary Sciences: Solar System Objects / Moon
Scientific paper
We report initial measurements of light flash generated by hypervelocity impact of micron-sized dust from the accelerator at the Colorado Center for Lunar Dust and Atmospheric Studies (CCLDAS). The mechanics of hypervelocity impacts, including heating, generation of plasma and neutral gas, particulate ejecta and free-streaming charged particles, are complex and poorly understood despite nearly four decades of research. One well-known effect of such impacts is a burst of light which spans the first tens to hundreds of microseconds following the impact event. Time-resolved analysis of emitted light, including spectral information, is a valuable diagnostic tool providing information about the evolution of the impact-generated plasma. As part of a planned comprehensive study into the characteristics of the impact-generated plasma, we will perform complimentary experiments on impact-generated light flash at the CCLDAS dust accelerator and at the Light Gas Gun facility at NASA Johnson Space Center. The CCLDAS dust accelerator is designed to launch micron- and submicron-sized particles at speeds of 1km/sec to 100km/sec; the Light Gas Gun is capable of accelerating particles up to a millimeter in size at speeds of 3.5-7 km/sec. A program of experiments spanning the two facilities provides the opportunity to explore scaling of plasma characteristics over many decades in velocity and mass. We present initial results from photomultiplier tube (PMT) observation of light flashes at the CCLDAS accelerator, along with an overview of the current theoretical understanding of their origin.
Ccldas Team
Collette A.
Horanyi Mihaly
Mocker Anna
Munsat T.
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