Minimizing scatter-losses during pre-heat for magneto-inertial fusion targets

Geissel, Matthias; Harvey-Thompson, Adam J.; Awe, Thomas J.; Bliss, David E.; Glinsky, Michael E.; Gomez, Matthew R.; Harding, Eric; Hansen, Stephanie B.; Jennings, Christopher; Kimmel, Mark W.; Knapp, Patrick; Lewis, Sean M.; Peterson, Kyle; Schollmeier, Marius; Schwarz, Jens; Shores, Jonathon E.; Slutz, Stephen A.; Sinars, Daniel B.; Smith, Ian C.; Speas, C. Shane; Vesey, Roger A.; Weis, Matthew R.; Porter, John L.

doi:10.1063/1.5003038

Minimizing scatter-losses during pre-heat for magneto-inertial fusion targets

Journal Article · Tue Feb 20 23:00:00 EST 2018 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5003038· OSTI ID:1459929

^[1]; Harvey-Thompson, Adam J. ^[1]; Awe, Thomas J. ^[1]; Bliss, David E. ^[1]; Glinsky, Michael E. ^[1]; Gomez, Matthew R. ^[1]; Harding, Eric ^[1]; Hansen, Stephanie B. ^[1]; Jennings, Christopher ^[1]; Kimmel, Mark W. ^[1]; ^[1]; Lewis, Sean M. ^[1]; ^[1]; ^[1]; Schwarz, Jens ^[1]; Shores, Jonathon E. ^[1]; Slutz, Stephen A. ^[1]; Sinars, Daniel B. ^[1]; Smith, Ian C. ^[1]; Speas, C. Shane ^[1] more »

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Here, the size, temporal and spatial shape, and energy content of a laser pulse for the pre-heat phase of magneto-inertial fusion affect the ability to penetrate the window of the laser-entrance-hole and to heat the fuel behind it. High laser intensities and dense targets are subject to laser-plasma-instabilities (LPI), which can lead to an effective loss of pre-heat energy or to pronounced heating of areas that should stay unexposed. While this problem has been the subject of many studies over the last decades, the investigated parameters were typically geared towards traditional laser driven Inertial Confinement Fusion (ICF) with densities either at 10% and above or at 1% and below the laser's critical density, electron temperatures of 3–5 keV, and laser powers near (or in excess of) 1 × 10¹⁵ W/cm². In contrast, Magnetized Liner Inertial Fusion (MagLIF) currently operates at 5% of the laser's critical density using much thicker windows (1.5–3.5 μm) than the sub-micron thick windows of traditional ICF hohlraum targets. This article describes the Pecos target area at Sandia National Laboratories using the Z-Beamlet Laser Facility as a platform to study laser induced pre-heat for magneto-inertial fusion targets, and the related progress for Sandia's MagLIF program. Forward and backward scattered light were measured and minimized at larger spatial scales with lower densities, temperatures, and powers compared to LPI studies available in literature.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE Advanced Research Projects Agency - Energy (ARPA-E)

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1459929

Report Number(s):: SAND--2018-6872J; 664963

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 2 Vol. 25; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Laser entrance window transmission and reflection measurements for preheating in magnetized liner inertial fusion Davies, J. R.; Bahr, R. E.; Barnak, D. H. Physics of Plasmas, Vol. 25, Issue 6 https://doi.org/10.1063/1.5030107	journal	June 2018
Diagnosing and mitigating laser preheat induced mix in MagLIF Harvey-Thompson, A. J.; Weis, M. R.; Harding, E. C. Physics of Plasmas, Vol. 25, Issue 11 https://doi.org/10.1063/1.5050931	journal	November 2018
Phase modulation failsafe system for multi-kJ lasers based on optical heterodyne detection Armstrong, D. J.; Looker, Q. M.; Stahoviak, J. W. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5051125	journal	October 2018
Enhancing performance of magnetized liner inertial fusion at the Z facility Slutz, S. A.; Gomez, M. R.; Hansen, S. B. Physics of Plasmas, Vol. 25, Issue 11 https://doi.org/10.1063/1.5054317	journal	November 2018
Origins and effects of mix on magnetized liner inertial fusion target performance Knapp, P. F.; Gomez, M. R.; Hansen, S. B. Physics of Plasmas, Vol. 26, Issue 1 https://doi.org/10.1063/1.5064548	journal	January 2019
Constraining preheat energy deposition in MagLIF experiments with multi-frame shadowgraphy Harvey-Thompson, A. J.; Geissel, M.; Jennings, C. A. Physics of Plasmas, Vol. 26, Issue 3 https://doi.org/10.1063/1.5086044	journal	March 2019

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