Thomson scattering from Inertial Confinement Fusion targets

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We have applied ultraviolet Thomson scattering to accurately measure the electron and ion temperature in high-density gas-filled hohlraums at the Nova laser facility. The implementation of a short-wavelength probe laser that operates at 263 nm (4{omega}) has allowed us for the first time to investigate scalings to high gas fill densities and to characterize the hohlraum conditions of the low-Z gas plasma. as well as of the high-Z wall plasma. These measurements have provided us with a unique data set that we use to make critical comparisons with radiation-hydrodynamic modeling using the code LASNEX. This code is presently being applied ... continued below

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Baldis, H A; Estabrook, K G; Glenzer, S H & Suter, L J July 22, 1999.

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We have applied ultraviolet Thomson scattering to accurately measure the electron and ion temperature in high-density gas-filled hohlraums at the Nova laser facility. The implementation of a short-wavelength probe laser that operates at 263 nm (4{omega}) has allowed us for the first time to investigate scalings to high gas fill densities and to characterize the hohlraum conditions of the low-Z gas plasma. as well as of the high-Z wall plasma. These measurements have provided us with a unique data set that we use to make critical comparisons with radiation-hydrodynamic modeling using the code LASNEX. This code is presently being applied to design fusion targets for the National Ignition Facility. The Thomson scattering experiments show the existence of electron temperature gradients in the gas plasma that are well modeled when including a self-consistent calculation of magnetic fields. The fields are of relatively small strength not affecting the Thomson scattering spectra directly but limiting the electron thermal transport in the gas resulting into temperature gradients consistent with the experimental observations. In addition, the ion temperature data show that the stagnation time of the gas plasma on the hohlraum axis, which is driven by the radial inward flowing plasma, is sensitive to the gas fill density and is well described by the calculations.

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131 Kilobytes pages

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  • 9th International Symposium on Laser-Aided Plasma Diagnostics, Lake Tahoe, CA (US), 09/26/1999--10/01/1999

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  • Report No.: UCRL-JC-134883
  • Report No.: DP0210000
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 9357
  • Archival Resource Key: ark:/67531/metadc794832

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  • July 22, 1999

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  • Dec. 19, 2015, 7:14 p.m.

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  • May 6, 2016, 3:52 p.m.

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Baldis, H A; Estabrook, K G; Glenzer, S H & Suter, L J. Thomson scattering from Inertial Confinement Fusion targets, article, July 22, 1999; California. (digital.library.unt.edu/ark:/67531/metadc794832/: accessed June 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.