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Title: Temperature distributions and gradients in laser-heated plasmas relevant to magnetized liner inertial fusion

Abstract

We present two-dimensional temperature measurements of magnetized and unmagnetized plasma experiments performed at Z relevant to the preheat stage in magnetized liner inertial fusion. The deuterium gas fill was doped with a trace amount of argon for spectroscopy purposes, and time-integrated spatially resolved spectra and narrow-band images were collected in both experiments. The spectrum and image data were included in two separate multiobjective analysis methods to extract the electron temperature spatial distribution T e ( r , z ) . The results indicate that the magnetic field increases T e , the axial extent of the laser heating, and the magnitude of the radial temperature gradients. Comparisons with simulations reveal that the simulations overpredict the extent of the laser heating and underpredict the temperature. Temperature gradient scale lengths extracted from the measurements also permit an assessment of the importance of nonlocal heat transport.

Authors:
ORCiD logo [1];  [1];  [2];  [2];  [2];  [2];  [2];  [2];  [2]
  1. Univ. of Nevada, Reno, NV (United States). Physics Dept.
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1667428
Report Number(s):
SAND-2020-9439J
Journal ID: ISSN 2470-0045; 690458
Grant/Contract Number:  
AC04-94AL85000; 1575018; NA0003525
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review E
Additional Journal Information:
Journal Volume: 102; Journal Issue: 2; Journal ID: ISSN 2470-0045
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; magnetoinertial fusion; magnetized plasma; x-ray emission spectroscopy; plasma physics

Citation Formats

Carpenter, K. R., Mancini, R. C., Harding, E. C., Harvey-Thompson, A. J., Geissel, M., Weis, M. R., Hansen, S. B., Peterson, K. J., and Rochau, G. A.. Temperature distributions and gradients in laser-heated plasmas relevant to magnetized liner inertial fusion. United States: N. p., 2020. Web. https://doi.org/10.1103/physreve.102.023209.
Carpenter, K. R., Mancini, R. C., Harding, E. C., Harvey-Thompson, A. J., Geissel, M., Weis, M. R., Hansen, S. B., Peterson, K. J., & Rochau, G. A.. Temperature distributions and gradients in laser-heated plasmas relevant to magnetized liner inertial fusion. United States. https://doi.org/10.1103/physreve.102.023209
Carpenter, K. R., Mancini, R. C., Harding, E. C., Harvey-Thompson, A. J., Geissel, M., Weis, M. R., Hansen, S. B., Peterson, K. J., and Rochau, G. A.. Mon . "Temperature distributions and gradients in laser-heated plasmas relevant to magnetized liner inertial fusion". United States. https://doi.org/10.1103/physreve.102.023209. https://www.osti.gov/servlets/purl/1667428.
@article{osti_1667428,
title = {Temperature distributions and gradients in laser-heated plasmas relevant to magnetized liner inertial fusion},
author = {Carpenter, K. R. and Mancini, R. C. and Harding, E. C. and Harvey-Thompson, A. J. and Geissel, M. and Weis, M. R. and Hansen, S. B. and Peterson, K. J. and Rochau, G. A.},
abstractNote = {We present two-dimensional temperature measurements of magnetized and unmagnetized plasma experiments performed at Z relevant to the preheat stage in magnetized liner inertial fusion. The deuterium gas fill was doped with a trace amount of argon for spectroscopy purposes, and time-integrated spatially resolved spectra and narrow-band images were collected in both experiments. The spectrum and image data were included in two separate multiobjective analysis methods to extract the electron temperature spatial distribution Te(r,z). The results indicate that the magnetic field increases Te, the axial extent of the laser heating, and the magnitude of the radial temperature gradients. Comparisons with simulations reveal that the simulations overpredict the extent of the laser heating and underpredict the temperature. Temperature gradient scale lengths extracted from the measurements also permit an assessment of the importance of nonlocal heat transport.},
doi = {10.1103/physreve.102.023209},
journal = {Physical Review E},
number = 2,
volume = 102,
place = {United States},
year = {2020},
month = {8}
}

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