36 research outputs found
Hugoniot measurement of diamond under laser shock compression up to 2 Tpa
Copyright 2006 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Physics of Plasmas, 13(5), 052705, 2006 and may be found at http://dx.doi.org/10.1063/1.220519
Laser-Shock Compression and Hugoniot Measurements of Liquid Hydrogen to 55 GPa
The principal Hugoniot for liquid hydrogen was obtained up to 55 GPa under
laser-driven shock loading. Pressure and density of compressed hydrogen were
determined by impedance-matching to a quartz standard. The shock temperature
was independently measured from the brightness of the shock front. Hugoniot
data of hydrogen provide a good benchmark to modern theories of condensed
matter. The initial number density of liquid hydrogen is lower than that for
liquid deuterium, and this results in shock compressed hydrogen having a higher
compression and higher temperature than deuterium at the same shock pressure.Comment: 8 pages, 7 figures, 2 tables, accepted for publication in Physical
Review
Flyer acceleration experiments using high-power laser
Flyer acceleration technique using high-power lasers has several advantages such as the achieved velocities higher than 10 km/s and non-contamination to the products generated by impacts. In this study, we show that a high-power laser can achieve flyer velocities higher than 10 km/s up to 60 km/s using spherical projectiles with a diameter of 0.1 − 0.3mm. We discuss the projectile condition during the flight based on the results of numerical simulations
Measurements of sound velocity of laser-irradiated iron foils relevant to Earth core condition
We present a novel scheme to measure sound velocity of
shock-compressed iron of geophysical interest. The sound velocity of
laser-irradiated iron foils was obtained with side-on X-ray radiograph
technique from measured rarefaction wave velocity of shocked iron. Iron
foils were irradiated with a two-stepped square laser pulse to reach Earth's
core condition by double compression. The experimental parameters of
temperature and pressure were very close to the Earth's core condition
Measurements of sound velocity of laser-irradiated iron foils relevant to earth core condition
Sound velocity of laser-irradiated iron foils was
measured with side-on x-ray radiograph technique. Iron foils were irradiated
with two-stepped laser pulse to reach earth's core condition. We measured
not only the sound velocity but also temperature, pressure, shock velocity,
compressibility, and particle velocity. The experimental parameters of
temperature and pressure were very close to the earth's core condition. The
experimental results on the sound velocity are in good agreements with
previous experimental results and one-dimensional simulation results
Flyer acceleration experiments using high-power laser
Flyer acceleration technique using high-power lasers has several advantages such as the achieved velocities higher than 10 km/s and non-contamination to the products generated by impacts. In this study, we show that a high-power laser can achieve flyer velocities higher than 10 km/s up to 60 km/s using spherical projectiles with a diameter of 0.1 − 0.3mm. We discuss the projectile condition during the flight based on the results of numerical simulations