Bulletin of the American Physical Society
17th Biennial International Conference of the APS Topical Group on Shock Compression of Condensed Matter
Volume 56, Number 6
Sunday–Friday, June 26–July 1 2011; Chicago, Illinois
Session T4: Experimental Developments IV |
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Chair: Jon Eggert, Lawrence Livermore National Laboratory Room: Renaissance Ballroom C |
Thursday, June 30, 2011 11:00AM - 11:15AM |
T4.00001: Gigabar shock experiments at the National Ignition Facility Damian Swift, James Hawreliak, Steven Rothman, David Braun, Damien Hicks, Paula Rosen, Gilbert Collins The unprecedented laser capabilities of the National Ignition Facility (NIF) make it possible for the first time to countenance laboratory-scale experiments in which gigabar pressures can be applied to a reasonable volume of material, and sustained long enough for $\sim$percent level equation of state measurements to be made. We describe the design for planned experiments at the NIF, using a hohlraum drive to induce a spherically-converging shock in samples of different materials. Convergence effects increase the shock pressure to several gigabars over a radius of over 100 microns. The shock speed and compression will be measured radiographically over a range of pressures using an x-ray streak camera. In some cases, we will use doped layers to allow a radiographic measurement of particle velocity. This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. [Preview Abstract] |
Thursday, June 30, 2011 11:15AM - 11:30AM |
T4.00002: Principal Quasi-Isentropes of Several Materials to Multi-Megabar Pressure from Analysis of Magnetically Driven Ramp Compression Data Jean-Paul Davis, Matthew Martin, Marcus Knudson Quasi-isentropic ramp-wave experiments promise accurate equation-of-state (EOS) data in the solid phase at relatively low temperatures and multimegabar pressures. In this range of pressure, isothermal diamond-anvil techniques have limited pressure accuracy due to reliance on theoretical EOS of calibration standards, thus accurate quasi-isentropic compression data would help immensely in constraining EOS models. Multi-megabar ramp compression experiments using the Z Machine at Sandia as a magnetic drive with stripline targets have been performed on tantalum, copper, gold, beryllium, molybdenum, and aluminum metals as well as lithium fluoride crystal. Much of the data from these experiments are analyzed using a single-sample inverse Lagrangian approach. This technique, and the quantification of its uncertainties, will be described in detail. Results will be presented for selected materials, with comparisons to independently developed EOS. *Sandia National Laboratories is a multi-program laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the U.S. Department of Energy's National Nuclear Security Administration under contract DE-AC04-94AL85000. [Preview Abstract] |
Thursday, June 30, 2011 11:30AM - 11:45AM |
T4.00003: A Simple Isentropic Compression Experiment (ICE) Machine Douglas Tasker, Charles Mielke, George Rodriguez, Dwight Rickel A single-turn magnet pulsed power system at the Los Alamos National Laboratory (LANL) National High Magnetic Field Laboratory (NHMFL) was originally designed to measure actinide samples in extremes of high magnetic field (to 300 Tesla) ...[1, 2]. A simple modification to the system has converted it to a fast turnaround, inexpensive, magnetic isentropic compression system. For the design and predictions of performance of the NHMFL-ICE experiment a circuit code simulation was chosen to model all aspects of the experiment, electrical and physical. To this end, accurate dynamic load models were developed to simulate the compression and expansion of the dynamic load at high pressures using shock physics principles. This paper describes the potential performance of the system, recent experiments, and plans for a portable system. Portability will allow the machine to be used at various facilities such as the LANL proton radiography facility, LANSCE. To match the 2-$\mu $s rise time of the system the sample dimensions can be up to 5~mm thickness. The maximum stresses are $\sim $50GPa (0.5~Mbar) with the present design. \\[4pt] [1] S. E. Sebastian\textit{, et al.}, \textit{Procs. Natl. Acad. Sciences, }\underline {107}, 6175-6179. \\[0pt] [2] A. M. Alsmadi\textit{, et al.}, \textit{JAP} \underline {105}, 07E108-3. [Preview Abstract] |
Thursday, June 30, 2011 11:45AM - 12:00PM |
T4.00004: Paris-Edinburgh cell applications at HPCAT Changyong Park, Guoyin Shen, Yanbin Wang A Paris-Edinburgh cell (model VX-3) has been installed at HPCAT 16BM-B, a bending magnet white X-ray beamline at the Advanced Photon Source. The PE anvil and the heater assembly are specifically designed to contain the sample volume ranging from 0.03 mm$^{3}$ to $>$1.2 mm$^{3}$ while the entire sample volume can be seen through X-ray windows widely open in radial direction. The pressure and temperature of sample can reach up to 7 GPa and 2,300K, respectively. For diffraction experiment, the maximum momentum transfer, Q=4$\pi $sin($\theta )$/$\lambda $, can reach up to $\sim $40 {\AA}$^{-1}$. A real-time white-beam radiography imaging system obtains the absorption contrast images of compressed sample with 7x magnification, 5 $\mu $m image resolutions, and update rate of 0.1 msec to 60 sec per frame. A table top channel-cut monochromator which can provide 30-90 keV monochromatic X-rays is also available for transmission measurement. These series of new instrumental developments are expected to widen the range of user sciences at HPCAT with new opportunities for in-situ measurement of real-time radiography, amorphous and liquid structure, ultrasound velocity, density, electrical resistivity and thermal conductivity. [Preview Abstract] |
Thursday, June 30, 2011 12:00PM - 12:15PM |
T4.00005: CQ-4: a 4 MA, 500ns Compact Pulsed Power Generator Dedicated to Magnetically Driven Quasi-isentropic Compression Experiments (ICE) and Hypervelocity Flyer Plates Guiji Wang, Jianheng Zhao, Chengwei Sun, Bin Kuai, Jianjun Mo, Gang Wu Compact pulsed power generators have been widely used to produce high magnetic pressure to study dynamic behaviors of materials and do some hypervelocity impact experiments. After the compact pulsed power generator CQ-1.5 developed by us, a larger current and shorter rise time compact pulsed power generator CQ-4 has been designed and being constructed. The generator CQ-4 is composed of 20 energy-storage modules in parallel, of which is constituted by a 1.6$\mu $F, 100kV capacitor and a coaxial field-distortion spark gas switch with inductance of 25nH. The energy is transmitted by the aluminum strip transmission lines insulated by 16 layers of Mylar films, of which is 0.1 mm in thickness. Before the short-circuit load, 72 peaking capacitors in parallel with the energy-storage capacitors are used to shape the discharging current waveforms in load. Each peaking capacitor is with rated capacitance of 0.1$\mu $F and rated voltage of 120 kV. When the capacitor is charged to 70- 80 kV, the peak current can reach 4-5MA, and the rise time is 400-500ns (0-100{\%}). The expected magnetic pressure can be up to 100GPa on the metallic loads and a hypervelocity of 12-15km/s can be reached for the aluminum flyer plates with size of 10mm in diameter and 1.0mm in thickness. [Preview Abstract] |
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