Soft x-ray spectroscopy measurements of plasma conditions at early times in ICF experiments on OMEGA. Semi-annual report, November 1, 1998--April 30, 1999

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Since arrival of FY-99 funding in December, the authors have been preparing for the first series of experiments under this grant on the OMEGA laser facility, which just took place (for one day) on April 27, 1999. The campaign was successful and results will be included in the next progress report following analyses. For the first time, they fielded their Ten Inch Manipulator (TIM-) mounted flat-field, grazing-incidence extreme-ultraviolet (euv) spectrograph with a four-channel gated-stripline microchannel plate (MCP) detector. This spectrograph covers the spectral range of 30--250 {angstrom} (hv = 50--400 eV). As in a previous campaign of May 1998, where ... continued below

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12 p.

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Griem, H.R. & Elton, R.C. May 3, 1999.

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Description

Since arrival of FY-99 funding in December, the authors have been preparing for the first series of experiments under this grant on the OMEGA laser facility, which just took place (for one day) on April 27, 1999. The campaign was successful and results will be included in the next progress report following analyses. For the first time, they fielded their Ten Inch Manipulator (TIM-) mounted flat-field, grazing-incidence extreme-ultraviolet (euv) spectrograph with a four-channel gated-stripline microchannel plate (MCP) detector. This spectrograph covers the spectral range of 30--250 {angstrom} (hv = 50--400 eV). As in a previous campaign of May 1998, where the authors used this instrument with time-integrated photographic recording, the spectrograph reached closer to the target than did the previous version mounted on the chamber wall; such that the sensitivity increased by at least a factor-of-10 for viewing weak spectral features. The analysis during this reporting period of the euv spectroscopic results from the October 1998 NLUF/OMEGA campaign of Mg X, XI and XII spectra from n = 3 to n = 2 transitions are shown in Fig. 1 versus time. The data plotted represent a composite between the three most sensitive striplines, delayed relative to each other, for a number of shots. The intended emphasis was on the early portion of the event while the laser intensity is rising to a peak. This measured euv history agrees with that from the x-ray streak spectrographic data shown in Fig. 2 from the same campaign, i.e., the peak period of emission being in the first 1.5 ns.

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12 p.

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INIS; OSTI as DE99002841

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  • Other Information: PBD: 3 May 1999

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  • Other: DE99002841
  • Report No.: DOE/SF/21783--1
  • Grant Number: FG03-99SF21783
  • DOI: 10.2172/354985 | External Link
  • Office of Scientific & Technical Information Report Number: 354985
  • Archival Resource Key: ark:/67531/metadc688603

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  • May 3, 1999

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  • July 25, 2015, 2:20 a.m.

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Griem, H.R. & Elton, R.C. Soft x-ray spectroscopy measurements of plasma conditions at early times in ICF experiments on OMEGA. Semi-annual report, November 1, 1998--April 30, 1999, report, May 3, 1999; United States. (digital.library.unt.edu/ark:/67531/metadc688603/: accessed December 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.