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

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.

doi:10.1063/1.4961074

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

Journal Article · Wed Aug 24 00:00:00 EDT 2016 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4961074· OSTI ID:1289377

^[1]; Benedetti, L. R. ^[1]; Chen, H. ^[1]; Izumi, N. ^[1]; Khan, S. F. ^[1]; Ma, T. ^[1];

^[1];

^[1]; Pak, A. ^[1]; Patel, P. K. ^[1];

^[1]; Scott, H. A. ^[1]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

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.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1289377

Report Number(s):: LLNL-CONF-698884; RSINAK

Journal Information:: Review of Scientific Instruments, Vol. 87, Issue 11; Conference: Proceedings of the 21st Topical Conference on High-Temperature Plasma Diagnostics, Madison, WI (United States), 5-9 Jun 2016; ISSN 0034-6748

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 19 works

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References (7)

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Cited By (4)

The role of hot spot mix in the low-foot and high-foot implosions on the NIF Ma, T.; Patel, P. K.; Izumi, N. Physics of Plasmas, Vol. 24, Issue 5 https://doi.org/10.1063/1.4983625	journal	May 2017
Synthetic nuclear diagnostics for inferring plasma properties of inertial confinement fusion implosions Crilly, A. J.; Appelbe, B. D.; McGlinchey, K. Physics of Plasmas, Vol. 25, Issue 12 https://doi.org/10.1063/1.5027462	journal	December 2018
Implementing time resolved electron temperature capability at the NIF using a streak camera Khan, S. F.; Jarrott, L. C.; Patel, P. K. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5039382	journal	October 2018
Ultrafast measurements of ion temperature in high-energy-density plasmas by nuclear resonance fluorescence Yu, Yong; Shen, Baifei Physics of Plasmas, Vol. 26, Issue 6 https://doi.org/10.1063/1.5097641	journal	June 2019

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