Prior to implosion in Magnetized Liner Inertial Fusion (MagLIF), the fuel is heated to temperatures on the order of several hundred eV with a multi-kJ, multi-ns laser pulse. We present two laser heated plasma experiments, relevant to the MagLIF preheat stage, performed at Z with beryllium liners filled with deuterium and a trace amount of argon. In one experiment, there is no magnetic field and, in the other, the liner and fuel are magnetized with an 8.5 T axial magnetic field. The recorded time integrated, spatially resolved spectra of the Ar K-shell emission are sensitive to electron temperature Te. Individual analysis of the spatially resolved spectra produces electron temperature distributions Te(z) that are resolved along the axis of laser propagation. In the experiment with magnetic field, the plasma reaches higher temperatures and the heated region extends deeper within the liner than in the unmagnetized case. Radiation magnetohydrodynamics simulations of the experiments are presented and post-processed. A comparison of the results from experimental and simulated data reveals that the simulations underpredict Te in both cases but the differences are larger in the case with magnetic field.
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Research Article|
May 05 2020
Magnetic field impact on the laser heating in MagLIF
K. R. Carpenter
;
K. R. Carpenter
a)
1
Physics Department, University of Nevada
, Reno, Nevada 89557, USA
a)Author to whom correspondence should be addressed: [email protected]
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R. C. Mancini;
R. C. Mancini
1
Physics Department, University of Nevada
, Reno, Nevada 89557, USA
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E. C. Harding;
E. C. Harding
2
Sandia National Laboratories
, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
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A. J. Harvey-Thompson;
A. J. Harvey-Thompson
2
Sandia National Laboratories
, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
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M. Geissel
;
M. Geissel
2
Sandia National Laboratories
, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
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M. R. Weis
;
M. R. Weis
2
Sandia National Laboratories
, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
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S. B. Hansen;
S. B. Hansen
2
Sandia National Laboratories
, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
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K. J. Peterson
;
K. J. Peterson
2
Sandia National Laboratories
, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
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G. A. Rochau
G. A. Rochau
2
Sandia National Laboratories
, P.O. Box 5800, Albuquerque, New Mexico 87185, USA
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a)Author to whom correspondence should be addressed: [email protected]
Phys. Plasmas 27, 052704 (2020)
Article history
Received:
September 27 2019
Accepted:
April 09 2020
Citation
K. R. Carpenter, R. C. Mancini, E. C. Harding, A. J. Harvey-Thompson, M. Geissel, M. R. Weis, S. B. Hansen, K. J. Peterson, G. A. Rochau; Magnetic field impact on the laser heating in MagLIF. Phys. Plasmas 1 May 2020; 27 (5): 052704. https://doi.org/10.1063/1.5129417
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