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

Abstract

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.

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (US)
Sponsoring Org.:
USDOE Office of Defense Programs (DP) (US)
OSTI Identifier:
14284
Report Number(s):
UCRL-ID-135668; YN0100000; 97-ERD-133
YN0100000; 97-ERD-133; TRN: US0110988
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 3 Sep 1999
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; AMPLIFIERS; CONVECTION; HEAT SINKS; INERTIAL CONFINEMENT; SOLID STATE LASERS; TEMPERATURE GRADIENTS; US NATIONAL IGNITION FACILITY; WASTE HEAT; MATHEMATICAL MODELS

Citation Formats

Erlandson, A C, London, R, Manes, K, Marshall, C, Petty, C, Pierce, R, Smith, L, Sutton, S, and Zapata, L. Accelerated thermal recovery for flash-lamp-pumped solid-state laser amplifiers final report for 97-ERD-133. United States: N. p., 1999. Web. doi:10.2172/14284.
Erlandson, A C, London, R, Manes, K, Marshall, C, Petty, C, Pierce, R, Smith, L, Sutton, S, & Zapata, L. Accelerated thermal recovery for flash-lamp-pumped solid-state laser amplifiers final report for 97-ERD-133. United States. doi:10.2172/14284.
Erlandson, A C, London, R, Manes, K, Marshall, C, Petty, C, Pierce, R, Smith, L, Sutton, S, and Zapata, L. Fri . "Accelerated thermal recovery for flash-lamp-pumped solid-state laser amplifiers final report for 97-ERD-133". United States. doi:10.2172/14284. https://www.osti.gov/servlets/purl/14284.
@article{osti_14284,
title = {Accelerated thermal recovery for flash-lamp-pumped solid-state laser amplifiers final report for 97-ERD-133},
author = {Erlandson, A C and London, R and Manes, K and Marshall, C and Petty, C and Pierce, R and Smith, L and Sutton, S and Zapata, L},
abstractNote = {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.},
doi = {10.2172/14284},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {9}
}

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