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Title: Hotspot electron temperature from x-ray continuum measurements on the NIF

Abstract

We report on measurements of the electron temperature in the hotspot of inertially confined, layered, spherical implosions on the National Ignition Facility using a differential filtering diagnostic. Measurements of the DT and DD ion temperatures using neutron time-of-flight detectors are complicated by the contribution of hot spot motion to the peak width, which produce an apparent temperature higher than the thermal temperature. The electron temperature is not sensitive to this non-thermal velocity and is thus a valuable input to interpreting the stagnated hot spot conditions. Here we show that the current differential filtering diagnostic provides insufficient temperature resolution for the hot spot temperatures of interest. We then propose a new differential filter configuration utilizing larger pinhole size to increase spectral fluence, as well as thicker filtration. In conclusion, this new configuration will improve measurement uncertainty by more than a factor of three, allowing for a more accurate hotspot temperature.

Authors:
ORCiD logo [1];  [1];  [1];  [1];  [1];  [1]; ORCiD logo [1]; ORCiD logo [1];  [1];  [1]; ORCiD logo [1];  [1]
+ Show Author Affiliations
  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
OSTI Identifier:
1289377
Report Number(s):
LLNL-CONF-698884
Journal ID: ISSN 0034-6748; RSINAK
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 87; Journal Issue: 11; Conference: Proceedings of the 21st Topical Conference on High-Temperature Plasma Diagnostics, Madison, WI (United States), 5-9 Jun 2016; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; 42 ENGINEERING

Citation Formats

Jarrott, L. C., Benedetti, L. R., Chen, H., Izumi, N., Khan, S. F., Ma, T., Nagel, S. R., Landen, O. L., Pak, A., Patel, P. K., Schneider, M., and Scott, H. A. Hotspot electron temperature from x-ray continuum measurements on the NIF. United States: N. p., 2016. Web. doi:10.1063/1.4961074.
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Jarrott, L. C., Benedetti, L. R., Chen, H., Izumi, N., Khan, S. F., Ma, T., Nagel, S. R., Landen, O. L., Pak, A., Patel, P. K., Schneider, M., & Scott, H. A. Hotspot electron temperature from x-ray continuum measurements on the NIF. United States. https://doi.org/10.1063/1.4961074
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Jarrott, L. C., Benedetti, L. R., Chen, H., Izumi, N., Khan, S. F., Ma, T., Nagel, S. R., Landen, O. L., Pak, A., Patel, P. K., Schneider, M., and Scott, H. A. Wed . "Hotspot electron temperature from x-ray continuum measurements on the NIF". United States. https://doi.org/10.1063/1.4961074. https://www.osti.gov/servlets/purl/1289377.
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@article{osti_1289377,
title = {Hotspot electron temperature from x-ray continuum measurements on the NIF},
author = {Jarrott, L. C. and Benedetti, L. R. and Chen, H. and Izumi, N. and Khan, S. F. and Ma, T. and Nagel, S. R. and Landen, O. L. and Pak, A. and Patel, P. K. and Schneider, M. and Scott, H. A.},
abstractNote = {We report on measurements of the electron temperature in the hotspot of inertially confined, layered, spherical implosions on the National Ignition Facility using a differential filtering diagnostic. Measurements of the DT and DD ion temperatures using neutron time-of-flight detectors are complicated by the contribution of hot spot motion to the peak width, which produce an apparent temperature higher than the thermal temperature. The electron temperature is not sensitive to this non-thermal velocity and is thus a valuable input to interpreting the stagnated hot spot conditions. Here we show that the current differential filtering diagnostic provides insufficient temperature resolution for the hot spot temperatures of interest. We then propose a new differential filter configuration utilizing larger pinhole size to increase spectral fluence, as well as thicker filtration. In conclusion, this new configuration will improve measurement uncertainty by more than a factor of three, allowing for a more accurate hotspot temperature.},
doi = {10.1063/1.4961074},
journal = {Review of Scientific Instruments},
number = 11,
volume = 87,
place = {United States},
year = {2016},
month = {8}
}
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Publisher's Version of Record
https://doi.org/10.1063/1.4961074
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Cited by: 19 works
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Works referenced in this record:

Progress towards ignition on the National Ignition Facility
journal, July 2013

  • Edwards, M. J.; Patel, P. K.; Lindl, J. D.
  • Physics of Plasmas, Vol. 20, Issue 7
  • DOI: 10.1063/1.4816115

Imaging of high-energy x-ray emission from cryogenic thermonuclear fuel implosions on the NIF
journal, October 2012

  • Ma, T.; Izumi, N.; Tommasini, R.
  • Review of Scientific Instruments, Vol. 83, Issue 10
  • DOI: 10.1063/1.4733313

The experimental plan for cryogenic layered target implosions on the National Ignition Facility—The inertial confinement approach to fusion
journal, May 2011

  • Edwards, M. J.; Lindl, J. D.; Spears, B. K.
  • Physics of Plasmas, Vol. 18, Issue 5
  • DOI: 10.1063/1.3592173

The high-foot implosion campaign on the National Ignition Facility
journal, May 2014

  • Hurricane, O. A.; Callahan, D. A.; Casey, D. T.
  • Physics of Plasmas, Vol. 21, Issue 5
  • DOI: 10.1063/1.4874330

High-energy x-ray backlighter spectrum measurements using calibrated image plates
journal, February 2011

  • Maddox, B. R.; Park, H. S.; Remington, B. A.
  • Review of Scientific Instruments, Vol. 82, Issue 2
  • DOI: 10.1063/1.3531979

Advances in NLTE modeling for integrated simulations
journal, January 2010

Measurement of electron temperature of imploded capsules at the National Ignition Facility
journal, October 2012

  • Izumi, N.; Ma, T.; Barrios, M.
  • Review of Scientific Instruments, Vol. 83, Issue 10
  • DOI: 10.1063/1.4738660
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    Works referencing / citing this record:

    The role of hot spot mix in the low-foot and high-foot implosions on the NIF
    journal, May 2017

    • Ma, T.; Patel, P. K.; Izumi, N.
    • Physics of Plasmas, Vol. 24, Issue 5
    • DOI: 10.1063/1.4983625

    Synthetic nuclear diagnostics for inferring plasma properties of inertial confinement fusion implosions
    journal, December 2018

    • Crilly, A. J.; Appelbe, B. D.; McGlinchey, K.
    • Physics of Plasmas, Vol. 25, Issue 12
    • DOI: 10.1063/1.5027462

    Implementing time resolved electron temperature capability at the NIF using a streak camera
    journal, October 2018

    • Khan, S. F.; Jarrott, L. C.; Patel, P. K.
    • Review of Scientific Instruments, Vol. 89, Issue 10
    • DOI: 10.1063/1.5039382

    Ultrafast measurements of ion temperature in high-energy-density plasmas by nuclear resonance fluorescence
    journal, June 2019

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