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 Q5: High Energy Density Physics/Warm Dense Matter III |
Hide Abstracts |
Chair: Michael Desjarlais, Sandia National Laboratories Room: Renaissance Ballroom D |
Wednesday, June 29, 2011 4:00PM - 4:15PM |
Q5.00001: Creation of Solid Density Warm Dense Matter with LCLS Justin Wark, Sam Vinko, Orlando Ciricosta, Andrew Higginbotham, Chris Murphy, Philip Heimann, Byoung-ick Cho, Kyle Engelhorn, Roger Falcone, Bob Nagler, Haeja Lee, Jacek Krzywinski, Bill Schlotter, Josh Turner, Marc Messersmidt, Sven Toleikis, Ulf Zastrau, Tomas Burian, Ludek Vysin, Libor Juha, Yuan Ping, Richard Lee, Anna Levy, Colin Brown, Jerome Gaudin LCLS is the first true hard x-ray laser in the world, delivering x-rays with photon energies from 1 to 10 keV, with several mJ per pulse, with durations of a few 100 to less than 10 fsec at a repitition rate of 120 Hz. It is a billion times brighter than any sychrotron source in existence. We show initial experiments demonstrating the creation of warm solid-density matter with temperatures up to 200 eV in relatively large volumes, created by focussing the output of LCLS to intensities of order 10$^{18}$Wcm$^{-2}$ onto solid targets. Fluorescence from the targets allows charge states and temperatures to be deduced, and compared with code calculations. [Preview Abstract] |
Wednesday, June 29, 2011 4:15PM - 4:30PM |
Q5.00002: Warm dense matter study at Matter in Extreme Conditions (MEC) Instrument with LCLS in SLAC Eric Galtier, Hae Ja Lee, Bob Nagler The Matter in Extreme Conditions (MEC) instrument is being designed to study warm dense matter and high energy density matter. The lack of an appropriate x-ray light source has led to a paucity of robust techniques to create and probe high energy density matter. With the very recent advent of a high peak brightness x-ray source, the LCLS, MEC instrument can deliver the capability of studying phenomena of solid material under extreme conditions. We will describe the LCLS Materials under MEC instrument as well as the warm dense matter experimental program at LCLS. [Preview Abstract] |
Wednesday, June 29, 2011 4:30PM - 4:45PM |
Q5.00003: Double Shock Experiments on the Sandia Z Machine Heath Hanshaw, Marcus Knudson, Michael Desjarlais, Ray Lemke The double shock layered high-velocity flyer plate is one new capability being developed on Sandia's Z machine. With this technique, dynamic material data at high energy densities can be obtained at points in phase space which lie neither on principal Hugoniots nor on quasi-isentropic ramp curves. For example, the hypothesized HCP to BCC phase transition in beryllium can be measured, as can the high pressure melt curve. Another example is a postulated refreeze of tantalum. We discuss the double shock experiments being performed on Z, including accessible conditions, design and experimental methods, and analysis of results. \newline \newline 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] |
Wednesday, June 29, 2011 4:45PM - 5:00PM |
Q5.00004: Temperature measurements and hydrogen transformation under dynamic compression up to 150 GPa Nikolaev Dmitry, Ternovoi Vladimir, Pyalling Alexei, Kvitov Sergey, Fortov Vladimir Lithium fluoride single crystal window was used for registration of optical light emission during quasi-isentropic compression of hydrogen to the pressures 100-150 GPa. Initially gaseous hydrogen samples at 78 K temperature and different pressures in the range 4-30 MPa were investigated. Recorded brightness temperature profiles at near infrared wavelengths were analyzed to evaluate optical and transport properties of the investigated hydrogen sample and window. Different models of hydrogen EOS were used for one-dimensional hydrodynamic simulation of compression process and estimation of hydrogen temperature within compressed layer. The obtained data demonstrate abrupt change of final temperatures after heating higher then 3500K. [Preview Abstract] |
Wednesday, June 29, 2011 5:00PM - 5:30PM |
Q5.00005: Probing Warm Dense Matter electronic structure using X-ray absorption Near Edge Spectroscopy (XANES) Invited Speaker: The behavior and physical properties of warm dense matter, fundamental for various branches of physics including planetology and Inertial Confinement Fusion, are non trivial to simulate either theoretically, numerically or experimentally. Despite important progress obtained in the last decade on macroscopic characterization (e.g. equations of state), microscopic studies are today necessary to investigate finely the WDM structure changes, the phase transitions and to test physical hypothesis and approximations commonly used in calculations. In this work, highly compressed aluminum has been investigated with the aim of bringing information on the evolution of its electronic structure by using K-edge shift and XANES. The experiment was performed at LULI laboratory where we used one long pulse (500 ps, I$_{L}$~$\approx $~8~10$^{13}$~W/cm$^{2})$ to create a uniform shock and a second ps beam (I$_{L}$~$\approx $~10$^{17}$~W/cm$^{2})$ to generate an ultra-short broadband X-ray source near the Al K-edge. The spectra were registered by using two conical KAP Bragg crystals. The main target was designed to probe the Aluminum in reshocked conditions allowing us to probe and to test theories in an extreme regime up to now unexplored ($\rho \quad \approx $ 3 $\rho _{0}$ and T$\approx $ 8 eV). The hydrodynamical Al conditions were measured by using VISARs interferometers and self-emission diagnostics. By increasing the delay between the two beams, we have been able to observe the modification of absorption spectra for unloading Al conditions ($\rho $ $\ge $ 0.5 g/cc), and to put in evidence the relocalization of the 3p valence electrons occurring in the metal-non metal transition. All data have been compared to ab initio and dense plasma calculations. [Preview Abstract] |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700