Hugoniot measurements using 15 J laser-propelled flyer sheets

Details Hugoniot measurements using 15 J laser-propelled flyer sheets Hugoniot measurements using 15 J laser-propelled flyer sheets

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufm.p52a0480k&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #P52A-0480

Physics

5400 Planetology: Solid Surface Planets, 5420 Impact Phenomena (Includes Cratering), 5460 Physical Properties Of Materials, 5494 Instruments And Techniques, 6240 Meteorites And Tektites

Scientific paper

Flyer acceleration facilities with a high intensity laser, "laser gun", have been developed for the past two decades mainly in the field of high-pressure physics. Also in planetary science, laser guns should have some advantages, comparing to conventional guns such as powder guns and two-stage light-gas guns. First, the experiments with laser guns can be carried out under cleaner conditions because there is no gas from explosives. Second, the experiments can be carried out with a short time interval (every 30 minutes); a dozen of shots can be easily done within a day. Third, a high-intensity laser gun can achieve flyer-velocities higher than the escape velocity of Earth, 11.2 km/s, which is not achieved using powder or two-stage light-gas guns. We develop a flyer acceleration facility using a glass laser of University of Tokyo with an maximum energy of 15 J, a pulse width of 15 ns, a spot diameter of 700 μ m, and an intensity of about 100 GW/cm2. Aluminum (Al) sheets with a thickness of 50 μ m, which are attached to a glass base by adhesive, are irradiated. Vapor of Al and adhesive pushes the Al sheets to high velocities. At present, the flyer velocity is up to about 3 km/s due to the small intensity. Using this gun, we perform measurements of the Hugoniot equation of state. Flyer velocity and shock speed in a sample are measured simultaneously with a high-speed camera, and pressure and particle velocity in the sample are estimated by the impedance matching method. Here, as a sample, we use a meteorite (an ordinary chondrite, ALH769) and Hugoniot data are obtained. It should be noted that this measurement system can be used when a laser is upgraded and flyer velocity achieves more than 10 km/s.

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