Spatial filter issues

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Beamlet measurements show that cone pinholes outperform other types tested with regard to both closure and back reflections. A ±150 µrad stainless steel cone remained open for a 15.5 kJ, 10:1 contrast shaped pulse with ±7.5 µrad of SSD divergence, which more than meets the requirements for a NIF ignition pulse. Measurements also showed the maximum tolerable pressures in the NIF spatial filters to be a few milliTorr, leading to recommendations of 0.1 and 0.6 mTorr for the NIF transport and cavity spatial filters, respectively.

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Boley, C. D.; Bonneau, F.; Estabrook, K. G.; Milam, D. & Murray, J. E. July 23, 1998.

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Description

Beamlet measurements show that cone pinholes outperform other types tested with regard to both closure and back reflections. A ±150 µrad stainless steel cone remained open for a 15.5 kJ, 10:1 contrast shaped pulse with ±7.5 µrad of SSD divergence, which more than meets the requirements for a NIF ignition pulse. Measurements also showed the maximum tolerable pressures in the NIF spatial filters to be a few milliTorr, leading to recommendations of 0.1 and 0.6 mTorr for the NIF transport and cavity spatial filters, respectively.

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  • Third Annual International Conference on Solid State Lasers for Application (SSLA) to Inertial Confinement Fusion, Monterey, CA, June 7-12, 1998

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  • Other: DE00003414
  • Report No.: UCRL-JC-129751
  • Grant Number: W-7405-Eng-48
  • Office of Scientific & Technical Information Report Number: 3414
  • Archival Resource Key: ark:/67531/metadc683969

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  • July 23, 1998

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  • July 25, 2015, 2:20 a.m.

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  • May 6, 2016, 11:32 p.m.

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Boley, C. D.; Bonneau, F.; Estabrook, K. G.; Milam, D. & Murray, J. E. Spatial filter issues, article, July 23, 1998; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc683969/: accessed May 26, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.