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Title: Prevention of Residual Gas Condensation on the Laser Entry Hole Windows on Cryogenic NIF Targets Using a Protective Warm Film

Many of the early cryogenic shots on NIF were plagued by buildup of considerable mass of extraneous ice on the LEH windows, a consequence of condensation of the residual air in the surrounding chamber. Thickness of this ice depended on the exact chamber pressure and the target fielding time duration, both extremely difficult to keep constant given the broad range of target types being shot. In this paper, we describe our work in designing a robust solution in the form of a second thin film that shielded the LEH window from the contaminating ice. Several detailed cryogenic considerations were required to ensure the proper functioning of this new window, which were simulated and verified experimentally. Data from numerous subsequent shots showed marked improvement in performance, which made this new feature an essential component for all cryogenic NIF targets.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Report Number(s):
LLNL-JRNL-737820
Journal ID: ISSN 1536-1055
Grant/Contract Number:
AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
Fusion Science and Technology
Additional Journal Information:
Journal Volume: 73; Journal Issue: 3; Journal ID: ISSN 1536-1055
Publisher:
American Nuclear Society
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 70 PLASMA PHYSICS AND FUSION
OSTI Identifier:
1430923

Bhandarkar, Suhas, Fair, Jim, Haid, Ben, Mapoles, Evan, Atherton, Jeff, Thomas, Cliff, Moody, John, Kroll, Jeremy, and Nikroo, Abbas. Prevention of Residual Gas Condensation on the Laser Entry Hole Windows on Cryogenic NIF Targets Using a Protective Warm Film. United States: N. p., Web. doi:10.1080/15361055.2017.1406249.
Bhandarkar, Suhas, Fair, Jim, Haid, Ben, Mapoles, Evan, Atherton, Jeff, Thomas, Cliff, Moody, John, Kroll, Jeremy, & Nikroo, Abbas. Prevention of Residual Gas Condensation on the Laser Entry Hole Windows on Cryogenic NIF Targets Using a Protective Warm Film. United States. doi:10.1080/15361055.2017.1406249.
Bhandarkar, Suhas, Fair, Jim, Haid, Ben, Mapoles, Evan, Atherton, Jeff, Thomas, Cliff, Moody, John, Kroll, Jeremy, and Nikroo, Abbas. 2018. "Prevention of Residual Gas Condensation on the Laser Entry Hole Windows on Cryogenic NIF Targets Using a Protective Warm Film". United States. doi:10.1080/15361055.2017.1406249.
@article{osti_1430923,
title = {Prevention of Residual Gas Condensation on the Laser Entry Hole Windows on Cryogenic NIF Targets Using a Protective Warm Film},
author = {Bhandarkar, Suhas and Fair, Jim and Haid, Ben and Mapoles, Evan and Atherton, Jeff and Thomas, Cliff and Moody, John and Kroll, Jeremy and Nikroo, Abbas},
abstractNote = {Many of the early cryogenic shots on NIF were plagued by buildup of considerable mass of extraneous ice on the LEH windows, a consequence of condensation of the residual air in the surrounding chamber. Thickness of this ice depended on the exact chamber pressure and the target fielding time duration, both extremely difficult to keep constant given the broad range of target types being shot. In this paper, we describe our work in designing a robust solution in the form of a second thin film that shielded the LEH window from the contaminating ice. Several detailed cryogenic considerations were required to ensure the proper functioning of this new window, which were simulated and verified experimentally. Data from numerous subsequent shots showed marked improvement in performance, which made this new feature an essential component for all cryogenic NIF targets.},
doi = {10.1080/15361055.2017.1406249},
journal = {Fusion Science and Technology},
number = 3,
volume = 73,
place = {United States},
year = {2018},
month = {1}
}