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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]
  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. https://doi.org/10.1063/1.4961074.
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
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.
@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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Works referenced in this record:

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journal, July 2013

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    Works referencing / citing this record:

    Thermal Temperature Measurements of Inertial Fusion Implosions
    journal, August 2018


    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

    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

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


    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