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:
-
- 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.
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}
}
Web of Science
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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
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
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
Ultrafast measurements of ion temperature in high-energy-density plasmas by nuclear resonance fluorescence
journal, June 2019
- Yu, Yong; Shen, Baifei
- Physics of Plasmas, Vol. 26, Issue 6