Accelerated thermal recovery for flash-lamp-pumped solid-state laser amplifiers final report for 97-ERD-133

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We have developed a cost-effective method for accelerating the thermal wavefront recovery and shot rate of large, flashlamp-pumped, Nd:glass, Brewster-angle slab lasers of the type used for studying inertial confinement fusion (ICF) and laser-plasma interactions. This method removes waste pump heat by flowing slightly-chilled, turbulent gas over the flashlamps and blastshields after each shot, with the cooled blastshields serving as heat sinks for radiatively extracting residual heat deposited in the laser slabs. We performed both experiments and modeling to characterize residual optical distortions arising from both temperature gradients within the laser slabs as well as from buoyantly-driven convection currents in ... continued below

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439 Kilobytes pages

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Erlandson, A C; London, R; Manes, K; Marshall, C; Petty, C; Pierce, R et al. September 3, 1999.

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Description

We have developed a cost-effective method for accelerating the thermal wavefront recovery and shot rate of large, flashlamp-pumped, Nd:glass, Brewster-angle slab lasers of the type used for studying inertial confinement fusion (ICF) and laser-plasma interactions. This method removes waste pump heat by flowing slightly-chilled, turbulent gas over the flashlamps and blastshields after each shot, with the cooled blastshields serving as heat sinks for radiatively extracting residual heat deposited in the laser slabs. We performed both experiments and modeling to characterize residual optical distortions arising from both temperature gradients within the laser slabs as well as from buoyantly-driven convection currents in the amplifier cavity and attached beam tubes. The most rapid thermal recovery was achieved by reducing the temperature of the cooling gas by 0.5-1 C below the ambient temperature for about two hours after the shot. Model predictions for the 1.8-MJ National Ignition Facility (NIF) laser now being built at Lawrence Livermore National Laboratory (LLNL) show that such chilled-gas cooling would increase the thermal-distortion-limited shot rate from about one shot every eight hours to one shot every three to four hours, thus significantly increasing the potential scientific productivity of this major Department of Energy (DOE) facility.

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439 Kilobytes pages

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  • Other Information: PBD: 3 Sep 1999

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  • Report No.: UCRL-ID-135668
  • Report No.: YN0100000
  • Report No.: 97-ERD-133
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/14284 | External Link
  • Office of Scientific & Technical Information Report Number: 14284
  • Archival Resource Key: ark:/67531/metadc621838

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  • September 3, 1999

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  • June 16, 2015, 7:43 a.m.

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  • May 5, 2016, 8:59 p.m.

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Erlandson, A C; London, R; Manes, K; Marshall, C; Petty, C; Pierce, R et al. Accelerated thermal recovery for flash-lamp-pumped solid-state laser amplifiers final report for 97-ERD-133, report, September 3, 1999; California. (digital.library.unt.edu/ark:/67531/metadc621838/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.