Compton scattering measurements from dense plasmas

Journal Article · Thu Jun 12 00:00:00 EDT 2008 · Journal of Physics. Conference Series (Online)

DOI:https://doi.org/10.1088/1742-6596/112/3/032071· OSTI ID:1334258

Glenzer, S. H. ^[1]; Neumayer, P. ^[1]; Doppner, T. ^[1]; Landen, O. L. ^[1]; Lee, R. W. ^[1]; Wallace, R. J. ^[1]; Weber, S. ^[1]; Lee, H. J. ^[2]; Kritcher, A. L. ^[2]; Falcone, R. ^[2]; Regan, S. P. ^[3]; Sawada, H. ^[3]; Meyerhofer, D. D. ^[3]; Gregori, G. ^[4]; Fortmann, C. ^[5]; Schwarz, V. ^[5]; Redmer, R. ^[5]

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1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
2. Univ. of California, Berkeley, CA (United States)
3. Lab. for Laser Energetics, Rochester, NY (United States)
4. Univ. of Oxford, Oxford (United Kingdom)
5. Univ. Rostock, Rostock (Germany)

Here, Compton scattering techniques have been developed for accurate measurements of densities and temperatures in dense plasmas. One future challenge is the application of this technique to characterize compressed matter on the National Ignition Facility where hydrogen and beryllium will approach extremely dense states of matter of up to 1000 g/cc. In this regime, the density, compressibility, and capsule fuel adiabat may be directly measured from the Compton scattered spectrum of a high-energy x-ray line source. Specifically, the scattered spectra directly reflect the electron velocity distribution. In non-degenerate plasmas, the width provides an accurate measure of the electron temperatures, while in partially Fermi degenerate systems that occur in laser-compressed matter it provides the Fermi energy and hence the electron density. Both of these regimes have been accessed in experiments at the Omega laser by employing isochorically heated solid-density beryllium and moderately compressed beryllium foil targets. In the latter experiment, compressions by a factor of 3 at pressures of 40 Mbar have been measured in excellent agreement with radiation hydrodynamic modeling.

• Research Organization: Univ. of California, Berkeley, CA (United States)
• Sponsoring Organization: USDOE
• Grant/Contract Number: FG52-07NA28057; FG52-06NA26212
• OSTI ID: 1334258
• Alternate ID(s): OSTI ID: 1334336
• Journal Information: Journal of Physics. Conference Series (Online), Vol. 112, Issue 3; ISSN 1742-6596
• Publisher: Institute of Physics (IOP)
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY