Using collective x-ray Thomson scattering to measure temperature and density of warm dense matter

Conference · Wed Jul 29 04:00:00 EDT 2009

DOI:https://doi.org/10.1117/12.825395· OSTI ID:964502

Doeppner, T; Davis, P F; Kritcher, A L; Landen, O L; Lee, H J; Regan, S P; Glenzer, S

Collective x-ray Thomson scattering allows measuring plasmons, i.e electron plasma oscillations (Langmuir waves). This is manifest in the appearance of spectrally up- and down-shifted spectral features in addition to the Rayleigh signal. The ratio of the up- and down-shifted signals is directly related to detailed balance, allowing to determine the plasma temperature from first principles. The spectral shift of the plasmon signals is sensitive to temperature and electron density. We discuss the experimental considerations that have to be fulfilled to observe plasmon signals with x-ray Thomson scattering. As an example, we describe an experiment that used the Cl Ly-{alpha} x-ray line at 2.96 keV to measure collective Thomson scattering from solid beryllium, isochorically heated to 18 eV. Since temperature measurement based on detailed balance is based on first principles, this method is important to validate models that, for example, calculate the static ion-ion structure factor S{sub ii}(k).

• Research Organization: Lawrence Livermore National Laboratory (LLNL), Livermore, CA
• Sponsoring Organization: USDOE
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 964502
• Report Number(s): LLNL-CONF-415592
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BERYLLIUM
ELECTRON DENSITY
ELECTRON TEMPERATURE
ELECTRONS
ION TEMPERATURE
OPTICS
PLASMA WAVES
PLASMONS
SPECTRAL SHIFT
STRUCTURE FACTORS
TEMPERATURE MEASUREMENT
THOMSON SCATTERING