Characterization of High-Temperature Laser-Produced Plasmas Using Thomson Scattering

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Ultraviolet Thomson scattering has been fielded at the Omega Laser Facility to achieve accurate measurements of the plasma conditions in laser-produced high-temperature plasmas. Recent applications to hohlraum targets that have been filled with CH gas or SiO{sub 2} foams have demonstrated a new high temperature plasma regime of importance to laser-plasma interaction studies in a strongly damped regime such as those occurring in indirect drive inertial confinement fusion experiments. The Thomson scattering spectra show the collective ion acoustic features that fit the theory for two ion species plasmas and from which we infer the electron and ion temperature. We find ... continued below

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8 p. (0.3 MB)

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Glenzer, S H; Froula, D H; Ross, S; Niemann, C; Meezan, N & Divol, L September 16, 2005.

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Ultraviolet Thomson scattering has been fielded at the Omega Laser Facility to achieve accurate measurements of the plasma conditions in laser-produced high-temperature plasmas. Recent applications to hohlraum targets that have been filled with CH gas or SiO{sub 2} foams have demonstrated a new high temperature plasma regime of importance to laser-plasma interaction studies in a strongly damped regime such as those occurring in indirect drive inertial confinement fusion experiments. The Thomson scattering spectra show the collective ion acoustic features that fit the theory for two ion species plasmas and from which we infer the electron and ion temperature. We find that the electron temperature scales from 2-4 keV when increasing the heater beam energy into the hohlraum from 8-17 kJ, respectively. Simultaneous measurements of the stimulated Raman scattering from a green 527 nm interaction beam show that the reflectivity decreases from 20% to 1% indicating that this instability is strongly damped at high temperatures. These findings support green laser beams as possible driver option for laser-driven fusion experiments.

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8 p. (0.3 MB)

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PDF-file: 8 pages; size: 0.3 Mbytes

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  • Presented at: 12th International Symposium on Laser-Aided Plasma Diagnostics, Snowbird, UT, United States, Oct 25 - Oct 29, 2005

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  • Report No.: UCRL-PROC-215698
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 883570
  • Archival Resource Key: ark:/67531/metadc876959

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Office of Scientific & Technical Information Technical Reports

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  • September 16, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • April 17, 2017, 1:34 p.m.

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Glenzer, S H; Froula, D H; Ross, S; Niemann, C; Meezan, N & Divol, L. Characterization of High-Temperature Laser-Produced Plasmas Using Thomson Scattering, article, September 16, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc876959/: accessed May 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.