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

Journal Article · Tue Dec 15 00:00:00 EST 2009 · Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics (Print)

DOI:https://doi.org/10.1103/PHYSREVE.80.066406· OSTI ID:21347386

Kugland, N L; Niemann, C ^[1]; Gregori, G ^[2]; Bandyopadhyay, S; Spindloe, C ^[3]; Brenner, C M ^[4]; Brown, C R. D. ^[5]; Constantin, C ^[1]; Glenzer, S H ^[6]; Khattak, F Y ^[7]; Kritcher, A L ^[8]; Otten, A; Pelka, A; Roth, M ^[9]; Pasley, J ^[10]; Riley, D ^[11]

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1. Physics Department, University of California-Los Angeles, Los Angeles, California 90095 (United States)
2. Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU (United Kingdom)
3. CLF, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX (United Kingdom)
4. SUPA, Department of Physics, University of Strathclyde, 107 Rottenrow, Glasgow G4 0NG (United Kingdom)
5. Imperial College, Blackett Laboratory, Imperial College London, London SW7 2AZ (United Kingdom)
6. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
7. Department of Physics, Kohat University of Science and Technology, Kohat 26000, NWFP (Pakistan)
8. Nuclear Engineering Department, University of California-Berkeley, Berkeley, California 94709 (United States)
9. Institut fuer Kernphysik, Technische Universitaet Darmstadt, Schlossgartenstrasse 9, D-64289 Darmstadt (Germany)
10. Department of Physics, University of York, Heslington, York YO10 5DD (United Kingdom)
11. School of Mathematics and Physics, Queen's University of Belfast, Belfast BT7 1NN (United Kingdom)

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 deg. 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.

• OSTI ID: 21347386
• Journal Information: Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics (Print), Vol. 80, Issue 6; Other Information: DOI: 10.1103/PhysRevE.80.066406; (c) 2009 The American Physical Society; ISSN 1539-3755
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AMPLITUDES
CRYSTALS
ELASTIC SCATTERING
EVOLUTION
FOILS
GEOMETRY
GRAPHITE
HYDRODYNAMICS
IONIZATION
KEV RANGE 01-10
LASERS
LITHIUM
PHOTONS
PLASMA
PLASMA DIAGNOSTICS
PLASMA HEATING
PLASMA SIMULATION
PULSES
SHOCK WAVES
X-RAY DIFFRACTION
ALKALI METALS
BOSONS
CARBON
COHERENT SCATTERING
DIFFRACTION
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
FLUID MECHANICS
HEATING
KEV RANGE
MASSLESS PARTICLES
MATHEMATICS
MECHANICS
METALS
MINERALS
NONMETALS
SCATTERING
SIMULATION