Magnetic field impact on the laser heating in MagLIF

Carpenter, Kyle R.; Mancini, Roberto C.; Harding, Eric C.; Harvey-Thompson, Adam James; Geissel, Matthias; Weis, Matthew Robert; Hansen, Stephanie B.; Peterson, Kyle John John; Rochau, Gregory A.

doi:10.1063/1.5129417

Magnetic field impact on the laser heating in MagLIF

Journal Article · Tue May 05 00:00:00 EDT 2020 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5129417· OSTI ID:1691453

^[1]; Mancini, Roberto C. ^[1]; Harding, Eric C. ^[2]; Harvey-Thompson, Adam James ^[2]; ^[2]; ^[2]; Hansen, Stephanie B. ^[2]; ^[2]; Rochau, Gregory A. ^[2]

Univ. of Nevada, Reno, NV (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

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. In this paper, 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 T_e. Individual analysis of the spatially resolved spectra produces electron temperature distributions T_e(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 T_e in both cases but the differences are larger in the case with magnetic field.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000; NA0003525

OSTI ID:: 1691453

Report Number(s):: SAND--2020-11248J; 691533

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 5 Vol. 27; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Magnetic field impact on the laser heating in MagLIF

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