Code-to-code comparison between FLASH and HYDRA in gas-puff Z-pinch modeling

Michta, D.; Tranchant, V.; Narkis, J.; Hansen, E. C.; Adams, M. B. P.; Moczulski, K.; Reyes, A.; Conti, F.; Beg, F. N.; Tzeferacos, P.

doi:10.1063/5.0231394

Code-to-code comparison between FLASH and HYDRA in gas-puff Z-pinch modeling

Journal Article · Mon Dec 30 23:00:00 EST 2024 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0231394· OSTI ID:2484255

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The numerical modeling of gas-puff Z pinches involves the nonlinear coupling of a broad range of complex, multi-physics phenomena that makes such simulations challenging. The challenge is further compounded by nonlinear instabilities that can impact the dynamics of imploding gas-puff Z pinches, such as the magneto Rayleigh–Taylor instability (MRTI). If the growth rate and amplitude of the latter is comparable to the relevant timescales and properties of the imploding plasma, the MRTI can dramatically alter implosion dynamics, dictate pinch stability, and govern the plasma properties achievable in pulsed-power-driven laboratory experiments. National Laboratories and academic teams have developed numerical tools that can accurately model Z-pinch configurations and provide reliable design capabilities that can guide experimental choices and assist in interpreting experimental results. Most such tools, however, are not broadly available. Here, we present newly developed Z-pinch simulation capabilities of the publicly available FLASH code, applied in the study of MRTI growth and dynamical effects in gas-puff implosions. To verify the new implementations, we perform a comparison of FLASH gas-puff implosion simulations with previously published calculations with the HYDRA code from Lawrence Livermore National Laboratory, which have been validated with experimental data from the CESZAR pulsed-power driver at the University of California, San Diego. The experiments involved double- and triple-nozzle configurations, in an experimental attempt to stabilize the pinch to the MRTI. The code-to-code comparison shows similar results between the FLASH and HYDRA simulations, supporting the use of FLASH in the modeling of future gas-puff Z-pinch experiments at CESZAR.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: NONE; SC0023246; AR0001272; NA0003842; NA0003856; NA0004144

OSTI ID:: 2484255

Alternate ID(s):: OSTI ID: 2511365
OSTI ID: 2519026

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 12 Vol. 31; ISSN 1070-664X

Publisher:: American Institute of PhysicsCopyright Statement

Country of Publication:: United States

Language:: English

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Code-to-code comparison between FLASH and HYDRA in gas-puff Z-pinch modeling

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Code-to-code comparison between FLASH and HYDRA in gas-puff Z-pinch modeling

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