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Title: Absolute calibration of the continuum x-ray spectrometer (ConSpec) at the National Ignition Facility

Abstract

We illustrate the absolute calibration of the continuum x-ray spectrometer (ConSpec), designed to measure the hot-spot electron temperature of inertial confinement fusion (ICF) implosions at the National Ignition Facility (NIF). The spectrometer measures emission from photon energies of 20 to 30 keV where opacity effects in ICF implosions at the NIF are negligible and provides spatial resolution to separate the hot-spot emission from other x-ray sources, such as the gold emission from the hohlraum wall. Using a combination of x-ray ray tracing and calibration data taken using a well characterized x-ray source, we measure the dispersion, spatial resolution, and absolute sensitivity of the instrument. Finally, we present an example spectrum measured at the NIF and demonstrate the ability to measure the hot-spot electron temperature with uncertainty under 10%.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1597605
Report Number(s):
LLNL-JRNL-790347
Journal ID: ISSN 1748-0221; 988027
Grant/Contract Number:  
AC52-07NA27344; NA0001944; 18-ERD-015
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Instrumentation
Additional Journal Information:
Journal Volume: 14; Journal Issue: 12; Journal ID: ISSN 1748-0221
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; Plasma physics

Citation Formats

MacDonald, M. J., Kozioziemski, B., MacPhee, A. G., Schneider, M. B., Ayers, J., and Thorn, D. B. Absolute calibration of the continuum x-ray spectrometer (ConSpec) at the National Ignition Facility. United States: N. p., 2019. Web. doi:10.1088/1748-0221/14/12/P12009.
MacDonald, M. J., Kozioziemski, B., MacPhee, A. G., Schneider, M. B., Ayers, J., & Thorn, D. B. Absolute calibration of the continuum x-ray spectrometer (ConSpec) at the National Ignition Facility. United States. doi:https://doi.org/10.1088/1748-0221/14/12/P12009
MacDonald, M. J., Kozioziemski, B., MacPhee, A. G., Schneider, M. B., Ayers, J., and Thorn, D. B. Thu . "Absolute calibration of the continuum x-ray spectrometer (ConSpec) at the National Ignition Facility". United States. doi:https://doi.org/10.1088/1748-0221/14/12/P12009. https://www.osti.gov/servlets/purl/1597605.
@article{osti_1597605,
title = {Absolute calibration of the continuum x-ray spectrometer (ConSpec) at the National Ignition Facility},
author = {MacDonald, M. J. and Kozioziemski, B. and MacPhee, A. G. and Schneider, M. B. and Ayers, J. and Thorn, D. B.},
abstractNote = {We illustrate the absolute calibration of the continuum x-ray spectrometer (ConSpec), designed to measure the hot-spot electron temperature of inertial confinement fusion (ICF) implosions at the National Ignition Facility (NIF). The spectrometer measures emission from photon energies of 20 to 30 keV where opacity effects in ICF implosions at the NIF are negligible and provides spatial resolution to separate the hot-spot emission from other x-ray sources, such as the gold emission from the hohlraum wall. Using a combination of x-ray ray tracing and calibration data taken using a well characterized x-ray source, we measure the dispersion, spatial resolution, and absolute sensitivity of the instrument. Finally, we present an example spectrum measured at the NIF and demonstrate the ability to measure the hot-spot electron temperature with uncertainty under 10%.},
doi = {10.1088/1748-0221/14/12/P12009},
journal = {Journal of Instrumentation},
number = 12,
volume = 14,
place = {United States},
year = {2019},
month = {12}
}

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