Scaling laser preheat for MagLIF with the Z-Beamlet laser

Weis, Matthew Robert; Harvey-Thompson, Adam James; Ruiz, Daniel Edward

doi:10.1063/5.0029850

Title: Scaling laser preheat for MagLIF with the Z-Beamlet laser

Journal Article · Fri Jan 15 00:00:00 EST 2021 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0029850· OSTI ID:1765779

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

Optimizing the performance of the Magnetized Liner Inertial Fusion (MagLIF) platform on the Z pulsed power facility requires coupling greater than 2 kJ of preheat energy to an underdense fuel in the presence of an applied axial magnetic field ranging from 10 to 30 T. Achieving the suggested optimal preheat energies has not been experimentally achieved so far. In this work, we explore the preheat design space for cryogenically cooled MagLIF targets, which represent a viable candidate for increasing preheat energies. Using 2D and 3D HYDRA MHD simulations, we first discuss the various physical effects that occur during laser preheat, such as laser energy deposition, self-focusing, and filamentation. After identifying the changes that different phase plates, gas-fill densities, and magnetic fields bring to the aforementioned physical effects, we, then, consider higher laser energies that are achievable with modest upgrades to the Z Beamlet laser. Lastly, with a 6.0-kJ upgraded laser, 3D calculations suggest that it is possible to deliver 4.25 kJ into the MagLIF fuel, resulting in an expected deuterium neutron yield of Y_DD ≃ 1.5 × 10¹⁴, or roughly 50 kJ of DT equivalent yield, at 20-MA current drive. This represents a 10-fold increase in the currently achieved yields for MagLIF.

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

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

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

OSTI ID:: 1765779

Alternate ID(s):: OSTI ID: 1760047

Report Number(s):: SAND-2021-0755J; 693603; TRN: US2206269

Journal Information:: Physics of Plasmas, Vol. 28, Issue 1; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Title: Scaling laser preheat for MagLIF with the Z-Beamlet laser

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