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Title: Sensitivity of Inferred Electron Temperature from X-ray Emission of NIF Cryogenic DT Implosions

Abstract

The National Ignition Facility (NIF) at the Lawrence Livermore National Laboratory seeks to achieve thermonuclear ignition through inertial confinement fusion. The accurate assessment of the performance of each implosion experiment is a crucial step. Here we report on work to derive a reliable electron temperature for the cryogenic deuteriumtritium implosions completed on the NIF using the xray signal from the Ross filter diagnostic. These Xrays are dominated by bremsstrahlung emission. By fitting the xray signal measured through each of the individual Ross filters, the source bremsstrahlung spectrum can be inferred, and an electron temperature of the implosion hot spot inferred. Currently, each filter is weighted equally in this analysis. We present work quantifying the errors with such a technique and the results from investigating the contribution of each filter to the overall accuracy of the temperature inference. Using this research, we also compare the inferred electron temperature against other measured implosion quantities to develop a more complete understanding of the hotspot physics.

Authors:
 [1]
  1. Univ. of Dallas, Irving, TX (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1251090
Report Number(s):
LLNL-TH-687161
DOE Contract Number:  
AC52-07NA27344
Resource Type:
Thesis/Dissertation
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING

Citation Formats

Klem, Michael. Sensitivity of Inferred Electron Temperature from X-ray Emission of NIF Cryogenic DT Implosions. United States: N. p., 2015. Web. doi:10.2172/1251090.
Klem, Michael. Sensitivity of Inferred Electron Temperature from X-ray Emission of NIF Cryogenic DT Implosions. United States. doi:10.2172/1251090.
Klem, Michael. Fri . "Sensitivity of Inferred Electron Temperature from X-ray Emission of NIF Cryogenic DT Implosions". United States. doi:10.2172/1251090. https://www.osti.gov/servlets/purl/1251090.
@article{osti_1251090,
title = {Sensitivity of Inferred Electron Temperature from X-ray Emission of NIF Cryogenic DT Implosions},
author = {Klem, Michael},
abstractNote = {The National Ignition Facility (NIF) at the Lawrence Livermore National Laboratory seeks to achieve thermonuclear ignition through inertial confinement fusion. The accurate assessment of the performance of each implosion experiment is a crucial step. Here we report on work to derive a reliable electron temperature for the cryogenic deuteriumtritium implosions completed on the NIF using the xray signal from the Ross filter diagnostic. These Xrays are dominated by bremsstrahlung emission. By fitting the xray signal measured through each of the individual Ross filters, the source bremsstrahlung spectrum can be inferred, and an electron temperature of the implosion hot spot inferred. Currently, each filter is weighted equally in this analysis. We present work quantifying the errors with such a technique and the results from investigating the contribution of each filter to the overall accuracy of the temperature inference. Using this research, we also compare the inferred electron temperature against other measured implosion quantities to develop a more complete understanding of the hotspot physics.},
doi = {10.2172/1251090},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2015},
month = {5}
}

Thesis/Dissertation:
Other availability
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