Bulletin of the American Physical Society
2008 APS April Meeting and HEDP/HEDLA Meeting
Volume 53, Number 5
Friday–Tuesday, April 11–15, 2008; St. Louis, Missouri
Session 13HE: Laboratory Studies of Dense Matter II |
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Sponsoring Units: HEDP HEDLA Chair: Dieter Hoffmann, GSI Room: Hyatt Regency St. Louis Riverfront (formerly Adam's Mark Hotel), Promenade F |
Monday, April 14, 2008 10:50AM - 11:15AM |
13HE.00001: Pressure ionization and phase transition in strongly coupled plasmas at megabars Invited Speaker: The investigation of electrical conductivity and thermodynamic properties of strongly coupled nonideal plasmas quasiisentropically compressed by reverberating shock waves up to megabars was carried out. HE-driven generators of intense shock waves were used for generation of warm and dense strongly non-ideal plasma with intense interparticle interaction and mixing Fermi-Boltzmann statistics. Flash highly resolved X-ray diagnostics were used to measure adiabatic compressibility of the plasma. The thermodynamic measurements demonstrate density increase at megabar pressure just in the density range where the electrical measurements have shown sharp -- five order of magnitude -- electrical conductivity increase due to pressure ionization in strongly coupled plasmas. These thermodynamic experimental data in combination with the electrical conductivity measurements were interpreted as the experimental signature of the specific phase transition in strongly non-ideal plasma. The existence of this new phase transition is supported by the ab initio Quantum Monte-Carlo, Density Functional Theory, and Molecular Dynamic simulations. Pressure dielectrization in shock compressed Li, Na, Ca was detected and discussed. [Preview Abstract] |
Monday, April 14, 2008 11:15AM - 11:40AM |
13HE.00002: High energy density physics experiments with intense heavy ion beams Invited Speaker: The US heavy ion fusion science program has developed techniques for heating ion-beam-driven warm dense matter (WDM) targets. The WDM conditions are to be achieved by combined longitudinal and transverse space-charge neutralized drift compression of the ion beam to provide a hot spot on the target with a beam spot size of about 1 mm, and pulse length about 1-2 ns. As a technique for heating volumetric samples of matter to high energy density, intense beams of heavy ions are capable of delivering precise and uniform beam energy deposition dE/dx, in a relatively large sample size, and the ability to heat any solid-phase target material. Initial experiments use a 0.3 MeV K+ beam (below the Bragg peak) from the NDCX-1 accelerator. The NDCX-II accelerator planned for the 2010 time frame is designed to heat targets at the Bragg peak using a 3-6 MeV lithium ion beam. The range of the beams in solid matter targets is about 1 micron, which can be lengthened by using porous targets at reduced density. We have developed a WDM target chamber, a cone focusing element to concentrate ion beam energy deposition on target, and a suite of target diagnostics including a fast multi-channel optical pyrometer, optical streak camera, VISAR, and high-speed gated cameras. Initial WDM experiments for 2008 will explore target parameters such as temperature and electrical conductivity. [Preview Abstract] |
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