Abstract
Although the pressures achievable in laser experiments continue to increase, the mechanisms underlying how solids deform at high strain rates are still not well understood. In particular, at higher pressures, the assumption that the difference between the longitudinal and transverse strains in a sample remains small becomes increasingly invalid. In recent years, there has been an increasing interest in simulating compression experiments on a granular level. In situ X-ray diffraction, where a target is probed with X-rays while a shock is propagating through it, is an excellent tool to test these simulations. We present data from the first long-pulse laser experiment at the MEC instrument of LCLS, the world's first hard X-ray Free Electron Laser, demonstrating large strain anisotropies. From this we infer shear stresses in polycrystalline copper of up to 1.75 GPa at a shock pressure of 32 GPa.
Original language | English |
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Article number | 112063 |
Journal | Journal of Physics: Conference Series |
Volume | 500 |
Issue number | 11 |
DOIs | |
Publication status | Published - 07 May 2014 |
Externally published | Yes |
Event | 18th Biennial Int. Conf. of the APS Topical Group on Shock Compression of Condensed Matter, APS-SCCM 2013 in Conjunction with the 24th Biennial Int. Conf. of the Int. Association for the Advancement of High Pressure Science and Technol., AIRAPT 2013 - Seattle, WA, United States Duration: 07 Jul 2013 → 12 Jul 2013 |
ASJC Scopus subject areas
- General Physics and Astronomy