skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Thomson-scattering measurements of high electron temperature hohlraum plasmas for laser-plasma interaction studies

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
894769
Report Number(s):
UCRL-JRNL-219323
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas, vol. 13, N/A, May 24, 2006, pp. 052704
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 70 PLASMA PHYSICS AND FUSION

Citation Formats

Froula, D H, Ross, J S, Divol, L, Meezan, N, MacKinnon, A J, Wallace, R, and Glenzer, S H. Thomson-scattering measurements of high electron temperature hohlraum plasmas for laser-plasma interaction studies. United States: N. p., 2006. Web. doi:10.1063/1.2203232.
Froula, D H, Ross, J S, Divol, L, Meezan, N, MacKinnon, A J, Wallace, R, & Glenzer, S H. Thomson-scattering measurements of high electron temperature hohlraum plasmas for laser-plasma interaction studies. United States. doi:10.1063/1.2203232.
Froula, D H, Ross, J S, Divol, L, Meezan, N, MacKinnon, A J, Wallace, R, and Glenzer, S H. Tue . "Thomson-scattering measurements of high electron temperature hohlraum plasmas for laser-plasma interaction studies". United States. doi:10.1063/1.2203232. https://www.osti.gov/servlets/purl/894769.
@article{osti_894769,
title = {Thomson-scattering measurements of high electron temperature hohlraum plasmas for laser-plasma interaction studies},
author = {Froula, D H and Ross, J S and Divol, L and Meezan, N and MacKinnon, A J and Wallace, R and Glenzer, S H},
abstractNote = {},
doi = {10.1063/1.2203232},
journal = {Physics of Plasmas, vol. 13, N/A, May 24, 2006, pp. 052704},
number = ,
volume = ,
place = {United States},
year = {Tue Feb 07 00:00:00 EST 2006},
month = {Tue Feb 07 00:00:00 EST 2006}
}
  • Accurate measurements of the plasma conditions in laser-produced high-temperature plasmas have been achieved using the recently activated 4{omega} Thomson-scattering diagnostic at the Omega Laser Facility, Soures et al., Laser Part. Beams 11 (1993). These diagnostic measurements were performed in a new hohlraum target platform that will be used to study laser-plasma interaction in a strongly damped regime comparable to those occurring in indirect drive inertial confinement fusion plasmas. The Thomson-scattering spectra show the collective ion-acoustic features that fit the theory for two ion species plasmas allowing us to accurately and independently determine both the electron and ion temperatures. The electronmore » temperature was found to range from 2 to 4 keV as the total heater beam energy deposited into the hohlraum was increased from 8 to 17 kJ. The results are compared to 2D hydrodynamic simulations using flux limited diffusion and nonlocal heat flux models. The target platform presented provides a novel test bed to investigate laser-plasma interaction physics in the strongly damped backscatter regime.« less
  • Time resolved Thomson scattering from thermal plasma fluctuations is used to measure the electron and ion temperatures in the interaction of a short pulse (1 nsec FWHM), high intensity (approx.2 x 10/sup 14/ W/cm/sup 2/) CO/sub 2/ laser beam with a preformed carbon plasma. Time histories of the plasma temperatures with a temporal resolution of approx.150 psec were obtained in a single irradiation/discharge event by streaking the Thomson scattering spectrum. The experimentally measured electron temperature was found to be lower than that predicted by computer simulations. The discrepancy is attributed mainly to a decrease in the inverse bremsstrahlung absorption coefficientmore » at high laser intensities (v/sub osc//v/sub e/>1) .« less
  • X-ray Thomson scattering (XRTS) is a powerful diagnostic for probing warm and hot dense matter. We present the design and results of the first XRTS experiments with hohlraum-driven CH 2 targets on the OMEGA laser. X-rays seen directly from the XRTS x-ray source overshadow the elastic scattering signal from the target capsule, but can be controlled in future experiments. From the inelastic scattering signal, an average plasma temperature is inferred that is in reasonable agreement with the temperatures predicted by simulations. Here, knowledge gained in this experiment show a promising future for further XRTS measurements on indirectly driven OMEGA targets.
  • We present the first simultaneous measurements of the Thomson scattering and electron cyclotron emission radiometer diagnostics performed at TCABR tokamak with Alfven wave heating. The Thomson scattering diagnostic is an upgraded version of the one previously installed at the ISTTOK tokamak, while the electron cyclotron emission radiometer employs a heterodyne sweeping radiometer. For purely Ohmic discharges, the electron temperature measurements from both diagnostics are in good agreement. Additional Alfven wave heating does not affect the capability of the Thomson scattering diagnostic to measure the instantaneous electron temperature, whereas measurements from the electron cyclotron emission radiometer become underestimates of the actualmore » temperature values.« less
  • Electron temperature and electron density measurements were made in an atmospheric-pressure argon plasma jet by line-shape analysis of Thomson-scattered laser light. The dependence of electron temperature and electron density on the scattering angle was investigated. Measurements were made using incident laser wavelengths of 532 and 355 nm. At 532 nm, the electron-ion collision frequency exceeds the Landau damping rate for shallow scattering angles, and the electron plasma wave resonance structure in the Thomson line shape is broadened. This resulted in dramatic increase in the apparent electron temperature as a function of decreasing scattering angle. At 355 nm, collisions do notmore » affect the Thomson line shape. In this case, an angular dependence of the measured electron temperature is not expected and was not observed. Data taken at 532 nm at larger scattering angles are consistent with the 355-nm results, and show that the electrons are not in thermodynamic equilibrium with the heavy particles. (c) 2000 The American Physical Society.« less