Gyrokinetic simulations of m=0 mode in sheared flow Z-pinch

Geyko, V. I.; Dorf, M.; Angus, J. R.

doi:10.1063/1.5100542

Title: Gyrokinetic simulations of m=0 mode in sheared flow Z-pinch

Journal Article · 17 June 2019 · Physics of Plasmas

DOI: https://doi.org/10.1063/1.5100542 · OSTI ID:1560115

Geyko, V. I. ^[1]; Dorf, M. ^[1]; Angus, J. R. ^[1]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Axisymmetric stability properties of sheared flow Z-pinch plasmas are studied by making use of the gyrokinetic approximation in the long-wavelength limit. Numerical simulations are carried out with the high-order finite-volume code COntinuum Gyrokinetic Edge New Technology (COGENT) and are analyzed for the parameters characteristic of the FuZE experiment. Reduction of the linear growth rate with increasing shear is observed, and the results are elucidated by making use of a local dispersion relation analysis. In addition, COGENT simulations are compared with fully kinetic particle-in-cell simulations, and with an ideal magnetohydrodynamics (MHD) model. Good agreement between the gyrokinetic and fully kinetic results for the linear stability is found, with the gyrokinetic model requiring much less computational time due to its ability to step over particle gyroperiod. The ideal MHD model is found to be consistent with the kinetic models in the long-wavelength part of the spectra ($$kρ_i$$), while failing to adequately predict short-scale ($$kρ_i$$) stability. Here, $$k$$ is the axial wavelength vector and $$ρ_i$$ is the ion gyroradius.

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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:: 1560115

Report Number(s):: LLNL--JRNL-769250; 960511

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: no. 6 Vol. vol. 26; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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