Thermal recovery of NIF amplifiers

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Description

The issue of thermal recovery of the NIF amplifiers has taken on increased emphasis as program goals move toward increasing the shot rate to once every four hours. This paper addresses the technical issues associated with achieving thermal recovery in the NIF amplifiers. We identify two temperature related thermal recovery quantities: (1) the difference between the average slab temperature and the temperature of other surfaces in the amplifier cavity, and (2) the temperature difference in the slab over the aperture. The first quantity relates to optical disturbances in the gas column in the system, while the second quantity is associated ... continued below

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14 p.

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Sutton, S.; Marshall, C.; Petty, C.; Smith, L.; van Wonterghem, B. & Mills, S. February 1, 1997.

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Description

The issue of thermal recovery of the NIF amplifiers has taken on increased emphasis as program goals move toward increasing the shot rate to once every four hours. This paper addresses the technical issues associated with achieving thermal recovery in the NIF amplifiers. We identify two temperature related thermal recovery quantities: (1) the difference between the average slab temperature and the temperature of other surfaces in the amplifier cavity, and (2) the temperature difference in the slab over the aperture. The first quantity relates to optical disturbances in the gas column in the system, while the second quantity is associated with optical aberrations in the laser media itself. Calculations and experiments are used to quantify recovery criteria, and develop cooling approaches. The cooling approaches discussed are (1) active cooling of the flashlamps with ambient gas and chilled gas, and (2) active cooling of the slab edge cladding. Calculations indicate that the NIF baseline cooling approach of 20 cfm per lamp ambient temperature gas flow in both the central and side flashlamp cassettes is capable of meeting thermal recovery requirements for an 8 hour shot period, while to achieve a 4 hour shot period requires use of chilled gas and edge cladding cooling. In addition, the effect of changing the amplifier cavity and beamtube fill gas from nitrogen to helium is addressed, showing that a factor of 8 reduction in the sensitivity to thermal disturbances is possible. 6 refs., 9 figs., 1 tab.

Physical Description

14 p.

Notes

INIS; OSTI as DE97053197

Medium: P; Size: 14 p.

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  • 2. annual solid state lasers for applications to inertial confinement fusion (ICF), Paris (France), 22-25 Oct 1996

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  • Other: DE97053197
  • Report No.: UCRL-JC--124528
  • Report No.: CONF-9610225--40
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/562469 | External Link
  • Office of Scientific & Technical Information Report Number: 562469
  • Archival Resource Key: ark:/67531/metadc692046

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  • February 1, 1997

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • April 7, 2017, 2:48 p.m.

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Sutton, S.; Marshall, C.; Petty, C.; Smith, L.; van Wonterghem, B. & Mills, S. Thermal recovery of NIF amplifiers, report, February 1, 1997; California. (digital.library.unt.edu/ark:/67531/metadc692046/: accessed August 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.