Evolution of elastic x-ray scattering in laser-shocked warm dense lithium

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Kugland, N. L. ; Gregori, G. ; Bandyopadhyay, S. ; Brenner, C. M. ; Brown, C. R. D. ; Constantin, C. ; Glenzer, S. H. ; Khattak, F. Y. ; Kritcher, A. L. ; Niemann, C. ; Otten, A. ; Pasley, J. ; Pelka, A. ; Roth, M. ; Spindloe, C. ; Riley, D. (2009)
  • Subject: 3109 | 2613 | 3104

We have studied the dynamics of warm dense Li with near-elastic x-ray scattering. Li foils were heated and compressed using shock waves driven by 4-ns-long laser pulses. Separate 1-ns-long laser pulses were used to generate a bright source of 2.96 keV Cl Ly-alpha photons for x-ray scattering, and the spectrum of scattered photons was recorded at a scattering angle of 120 degrees using a highly oriented pyrolytic graphite crystal operated in the von Hamos geometry. A variable delay between the heater and backlighter laser beams measured the scattering time evolution. Comparison with radiation-hydrodynamics simulations shows that the plasma is highly coupled during the first several nanoseconds, then relaxes to a moderate coupling state at later times. Near-elastic scattering amplitudes have been successfully simulated using the screened one-component plasma model. Our main finding is that the near-elastic scattering amplitudes are quite sensitive to the mean ionization state Z and by extension to the choice of ionization model in the radiation-hydrodynamics simulations used to predict plasma properties within the shocked Li.
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    N. L. Kugland,1,2 G. Gregori,3 S. Bandyopadhyay,4 C. M. Brenner,5,4 C. R. D. Brown,6,7 C. Constantin,1 S. H. Glenzer,2 F. Y. Khattak,8 A. L. Kritcher,9,2 C. Niemann,1,2 A. Otten,10 J. Pasley,11,4 A. Pelka,10 M. Roth,10 C. Spindloe,4 and D. Riley12 1Physics Department, University of California-Los Angeles, Los Angeles, California 90095, USA 2Lawrence Livermore National Laboratory, Livermore, California 94550, USA 3Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom 4CLF, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, United Kingdom 5SUPA, Department of Physics, University of Strathclyde, 107 Rottenrow, Glasgow G4 0NG, United Kingdom 6Imperial College, The Blackett Laboratory, Imperial College London, London SW7 2AZ, United Kingdom 7AWE Plc., Aldermaston, Reading RG7 4PR, United Kingdom 8Department of Physics, Kohat University of Science and Technology, Kohat 26000, NWFP, Pakistan 9Nuclear Engineering Department, University of California-Berkeley, Berkeley, California 94709, USA 10Institut für Kernphysik, Technische Universität Darmstadt, Schloßgartenstrasse 9, D-64289 Darmstadt, Germany 11Department of Physics, University of York, Heslington, York YO10 5DD, United Kingdom 12School of Mathematics and Physics, Queen's University of Belfast, Belfast BT7 1NN, United Kingdom Received 17 June 2009; published 17 December 2009

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