Soft x-ray images of the Laser Entrance Hole of NIC Hohlraums (paper, HTPD2012)

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Hohlraums at the National Ignition Facility convert laser energy into a thermal x-radiation drive, which implodes the capsule, thus compressing the fuel. The x-radiation drive is measured with a low resolution, time-resolved x-ray spectrometer that views the hohlraum's laser entrance hole (LEH) at 37{sup o} to the hohlraum axis. This measurement has no spatial resolution. To convert this to the drive inside the hohlraum, the area and fraction of the measured x-radiation which comes from the region inside the hohlraum must be known. The size of the LEH is measured with the time integrated Static X-ray Imager (SXI) which view ... continued below

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Schneider, M. B. & Meezan, N. B. April 30, 2012.

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Hohlraums at the National Ignition Facility convert laser energy into a thermal x-radiation drive, which implodes the capsule, thus compressing the fuel. The x-radiation drive is measured with a low resolution, time-resolved x-ray spectrometer that views the hohlraum's laser entrance hole (LEH) at 37{sup o} to the hohlraum axis. This measurement has no spatial resolution. To convert this to the drive inside the hohlraum, the area and fraction of the measured x-radiation which comes from the region inside the hohlraum must be known. The size of the LEH is measured with the time integrated Static X-ray Imager (SXI) which view the LEH at 18{sup o} to the hohlraum axis. A soft x-ray image has been added to the SXI to measure the fraction of x-radiation inside the LEH's Clear Aperture in order to correct the measured radiation. A multilayer mirror plus filter selects an x-ray band centered at 870 eV, near the x-ray energy peak of a 300 eV blackbody. Results from this channel and corrections to the x-radiation drive are discussed.

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PDF-file: 5 pages; size: 1.4 Mbytes

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  • Presented at: High Temperature Plasma Diagnostics, Monterey, CA, United States, May 06 - May 10, 2012

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  • Report No.: LLNL-CONF-555011
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 1043636
  • Archival Resource Key: ark:/67531/metadc843701

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  • April 30, 2012

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  • May 19, 2016, 3:16 p.m.

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  • Dec. 1, 2016, 10:37 p.m.

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Schneider, M. B. & Meezan, N. B. Soft x-ray images of the Laser Entrance Hole of NIC Hohlraums (paper, HTPD2012), article, April 30, 2012; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc843701/: accessed September 26, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.