Diagnosing and mitigating laser preheat induced mix in MagLIF

Harvey-Thompson, A. J.; Weis, M. R.; Harding, E. C.; Geissel, M.; Ampleford, D. J.; Chandler, G. A.; Fein, J. R.; Glinsky, M. E.; Gomez, M. R.; Hahn, K. D.; Hansen, S. B.; Jennings, C. A.; Knapp, P. F.; Paguio, R. R.; Perea, L.; Peterson, K. J.; Porter, J. L.; Rambo, P. K.; Robertson, G. K.; Rochau, G. A.; Ruiz, D. E.; Schwarz, J.; Shores, J. E.; Sinars, D. B.; Slutz, S. A.; Smith, G. E.; Smith, I. C.; Speas, C. S.; Whittemore, K.

doi:10.1063/1.5050931

Diagnosing and mitigating laser preheat induced mix in MagLIF

Journal Article · Thu Nov 15 23:00:00 EST 2018 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5050931· OSTI ID:1492367

Harvey-Thompson, A. J. ^[1]; ^[1]; Harding, E. C. ^[1]; ^[1]; ^[1]; Chandler, G. A. ^[1]; ^[1]; Glinsky, M. E. ^[1]; ^[1]; Hahn, K. D. ^[1]; Hansen, S. B. ^[1]; Jennings, C. A. ^[1]; ^[1]; Paguio, R. R. ^[2]; Perea, L. ^[1]; ^[1]; Porter, J. L. ^[1]; Rambo, P. K. ^[1]; Robertson, G. K. ^[1]; Rochau, G. A. ^[1] more »

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
General Atomics, San Diego, CA (United States)

A series of Magnetized Liner Inertial Fusion (MagLIF) experiments have been conducted in order to investigate the mix introduced from various target surfaces during the laser preheat stage. The material mixing was measured spectroscopically for a variety of preheat protocols by employing mid-atomic number surface coatings applied to different regions of the MagLIF target. The data show that the material from the top cushion region of the target can be mixed into the fuel during preheat. For some preheat protocols, our experiments show that the laser-entrance-hole (LEH) foil used to contain the fuel can be transported into the fuel a significant fraction of the stagnation length and degrade the target performance. Preheat protocols using pulse shapes of a few-ns duration result in the observable LEH foil mix both with and without phase-plate beam smoothing. In order to reduce this material mixing, a new capability was developed to allow for a low energy (~20 J) laser pre-pulse to be delivered early in time (–20 ns) before the main laser pulse (~1.5 kJ). In experiments, this preheat protocol showed no indications of the LEH foil mix. As a result, the experimental results are broadly in agreement with pre-shot two-dimensional HYDRA simulations that helped motivate the development of the early pre-pulse capability.

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

OSTI ID:: 1492367

Report Number(s):: SAND--2018-13636J; 670631

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 11 Vol. 25; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Nernst thermomagnetic waves in magnetized high energy density plasmas Velikovich, A. L.; Giuliani, J. L.; Zalesak, S. T. Physics of Plasmas, Vol. 26, Issue 11 https://doi.org/10.1063/1.5122178	journal	November 2019

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