Numerical Improvements in Magnetohydrodynamic, Pulsed Power Simulations of Near-Target Plasmas

Farmer, William A.; Ellison, C. L.; Hammer, J. H.; LeChien, K. R.; Meezan, Nathan B.; Raman, Kumar S.; Svidzinski, Vladimir; Tummel, Kurt

doi:10.1109/tps.2024.3352420

Title: Numerical Improvements in Magnetohydrodynamic, Pulsed Power Simulations of Near-Target Plasmas

Journal Article · 23 January 2024 · IEEE Transactions on Plasma Science

DOI: https://doi.org/10.1109/tps.2024.3352420 · OSTI ID:2340985

^[1]; Ellison, C. L. ^[2]; Hammer, J. H. ^[1]; LeChien, K. R. ^[2];

^[1];

^[1]

Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Pacific Fusion, Fremont, CA (United States)

Magnetohydrodynamic (MHD) simulations of pulsed power experiments frequently result in unphysical runaway heating when extended to low values of mass density. Traditionally, this has been addressed by the use of conductivity floors below which the plasma is given an arbitrarily low conductivity value. Here, a low-density treatment is presented that allows for low-density material to carry current while maintaining a stable temperature. This treatment is implemented in the Ares multiphysics code. Numerical modifications to the conventional vacuum treatment include an energy-conserving density floor, a modified averaging procedure to determine the thermal conductivity at the edge of adjacent zones, and a modified averaging procedure for determining the thermal conductivity in mixed zones that contain material from differing regions. Additionally, anomalous resistivity and Bohm diffusion models are implemented as simplified models for microphysics-induced enhancement of collisional transport. Importantly, the advantage of these various improvements are illustrated in a simple 1-D pulsed power target where the combined changes result in stable temperatures within the lower density regions.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

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

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 2340985

Report Number(s):: LLNL-JRNL-854341; 1081342

Journal Information:: IEEE Transactions on Plasma Science, Journal Name: IEEE Transactions on Plasma Science Journal Issue: 10 Vol. 52; ISSN 0093-3813

Publisher:: IEEECopyright Statement

Country of Publication:: United States

Language:: English

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