Controlling morphology and improving reproducibility of magnetized liner inertial fusion experiments

Ampleford, D. J.; Yager-Elorriaga, D. A.; Jennings, C. A.; Harding, E. C.; Gomez, M. R.; Harvey-Thompson, A. J.; Awe, T. J.; Chandler, G. A.; Dunham, G. S.; Geissel, M.; Hahn, K. D.; Hansen, S. B.; Knapp, P. F.; Lamppa, D. C.; Lewis, W. E.; Lucero, L.; Mangan, M.; Paguio, R.; Perea, L.; Robertson, G. A.; Ruiz, C. L.; Ruiz, D. E.; Schmit, P. F.; Slutz, S. A.; Smith, G. E.; Smith, I. C.; Speas, C. S.; Webb, T. J.; Weis, M. R.; Whittemore, K.; Yu, E. P.; McBride, R. D.; Peterson, K. J.; Jones, B. M.; Rochau, G. A.; Sinars, D. B.

doi:10.1063/5.0169981

Controlling morphology and improving reproducibility of magnetized liner inertial fusion experiments

Journal Article · Tue Feb 20 00:00:00 EST 2024 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0169981· OSTI ID:2567656

; ; Jennings, C. A.; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; Perea, L.; Robertson, G. A. more »

X-ray imaging indicates magnetized liner inertial fusion (MagLIF) stagnation columns have a complicated quasi-helical structure with significant variations in x-ray brightness along the column. In this work, we describe MagLIF experiments aimed at controlling these stagnation structures by varying the initial liner geometry and composition. First, by varying the initial aspect ratio of the liner, we demonstrate a change in the stagnation structures that is consistent with helical magneto Rayleigh–Taylor (MRT) instabilities feedthrough from the outer-to-inner surfaces of the liner. Second, to minimize the seed for such instabilities, we incorporate a dielectric coating on the outer surface of the beryllium liner, which has previously been shown to reduce the growth of the electrothermal instability, a likely seed for MRT growth. Using this coating, we achieve a stagnation column with significantly reduced helical structure and axial variation in x-ray brightness. We discuss how this coating changes the evolution of structures through stagnation along with the spatial uniformity of neutron production. Finally, we show that these more uniform stagnations also result in improved reproducibility in stagnation temperatures and primary DD neutron yield.

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

Grant/Contract Number:: NA0003525

OSTI ID:: 2567656

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 2 Vol. 31; ISSN 1070-664X

Publisher:: American Institute of PhysicsCopyright Statement

Country of Publication:: United States

Language:: English

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