Bulletin of the American Physical Society
18th Biennial Intl. Conference of the APS Topical Group on Shock Compression of Condensed Matter held in conjunction with the 24th Biennial Intl. Conference of the Intl. Association for the Advancement of High Pressure Science and Technology (AIRAPT)
Volume 58, Number 7
Sunday–Friday, July 7–12, 2013; Seattle, Washington
Session P3: NT.1 Novel Techniques: New Drives & Diagnostics |
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Chair: Ray Smith, Lawrence Livermore National Laboratory Room: Fifth Avenue |
Wednesday, July 10, 2013 11:00AM - 11:15AM |
P3.00001: Plane shock compression generators, utilizing convergence of conical shock waves Dmitry Nikolaev, Vladimir Ternovoi, Alexander Shutov, Vadim Kim The results of experimental testing of shock wave generators, based on Mach reflection of shock waves in a conical geometry, along with the results of numerical simulation will be presented. The hypervelocity shock in a layered cylindrical central body was produced by an impact of a converging conical flyer plate. Unlike in the designs proposed in the 80's, a conical flyer plate was originating from initially cylindrical cavity liner in a cylindrical HE charge, was launched by a sliding detonation. This approach led to device simplification, since precision manufacturing of conical parts from metal and explosive is no longer required. The sequential HE charge detonation by a 234 points distributor was employed to vary the launch angle. Five various launch angles were tested; the dependence of parameters of shock wave in cylindrical PMMA core on launch angle was investigated; shock velocities of 14-19 km/s were obtained in a PMMA cylindrical core. It was found that launch angles below 10$^{\circ}$ lead to the failure of the Mach reflection mode, while larger angles produced flat Mach disks with 16-17 mm diameter that could be utilized in various shock experiments. [Preview Abstract] |
Wednesday, July 10, 2013 11:15AM - 11:30AM |
P3.00002: The ramp compression experiment with laser-driven reservoir target at Shenguang-III prototype facility Shan Lianqiang, Xin Jianting, Shui Min, Gu Yuqiu The quasi-isentropic compression of material can be obtained by the ramp wave loading of plasma jet produced by laser-driven reservoir target. The experiments were carried out on the high power laser facility of SG-III prototype using Al with direct-driven and indirect-driven method. The smooth and continuous speed history of free surface of specimen was recorded with a line-imaging velocity interferometer(VISAR). 16/26/36$\mu $m Al foil were compressed to more than 40 GPa with good planarity. The back-integrating method gave almost the same loading history for the three steps. 7$\mu $m Al backed by 500$\mu $m LiF were compressed to near 200GPa. The rise time of the load was about 10ns and the strain was about 10$^{8}$s$^{-1}$. [Preview Abstract] |
Wednesday, July 10, 2013 11:30AM - 11:45AM |
P3.00003: Prospects for achieving high dynamic compression with low energy Michael Armstrong, Jonathan Crowhurst, Joseph Zaug, Sorin Bastea, Alexander Goncharov Laser driven dynamic compression experiments may, in materials with picosecond equilibration times, be possible with orders of magnitude less drive energy than currently used. As we show, the compression energy for geometrically similar experiments varies as the third power of the time scale of compression. For materials which equilibrate and can be characterized on picosecond time scales, the compression energy can be orders of magnitude smaller than the 1--100 ns scale time scale of many current experiments. The use of substantially lower compression energy is a great practical advantage in such experiments, potentially enabling the observation of extreme states of matter with table top scale laser systems. We discuss prospects for realizing this scheme in practice. This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract No. DE-AC52-07NA27344 with Laboratory directed Research and Development funding (11ERD039), as well as being based on work supported as part of the EFree, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Grant No. DESC0001057. [Preview Abstract] |
Wednesday, July 10, 2013 11:45AM - 12:15PM |
P3.00004: \textit{In-situ} diffraction diagnostics in laser driven compression experiments Invited Speaker: Andrew Higginbotham With the advent of increasingly powerful, and highly controllable laser systems, such as the National Ignition Facility (NIF) there is a peaked interest in the use of lasers to perform dynamic compression experiments relevant across a number of fields, from basic materials science to planetary physics. One key question in these experiments is how we gain information which takes us beyond a bulk understanding, to one which gives insight into the microstructure response during compression. In this talk we discuss recent developments in the field of \textit{in-situ} x-ray diffraction. We will present the results of novel white light Laue experiments which demonstrate the measurement of both strain anisotropy and estimates of defect densities \textit{in-situ}. In addition, a novel single photon energy dispersive diffraction geometry will be discussed which may prove to be ideally suited to the harsh environments characteristic of the NIF. We will also discuss the opportunities afforded by next generation light sources such as LCLS, and Europe's XFEL project, which promise to provide techniques highly complimentary to those used at large scale laser facilities. [Preview Abstract] |
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