Gyrokinetic simulations of m=0 mode in sheared flow Zpinch
Abstract
Axisymmetric stability properties of sheared flow Zpinch plasmas are studied by making use of the gyrokinetic approximation in the longwavelength limit. Numerical simulations are carried out with the highorder finitevolume 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 particleincell 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 longwavelength part of the spectra ($$kρ_i$$), while failing to adequately predict shortscale ($$kρ_i$$) stability. Here, $k$ is the axial wavelength vector and $$ρ_i$$ is the ion gyroradius.
 Authors:

 Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
 Publication Date:
 Research Org.:
 Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
 Sponsoring Org.:
 USDOE National Nuclear Security Administration (NNSA)
 OSTI Identifier:
 1560115
 Alternate Identifier(s):
 OSTI ID: 1526656
 Report Number(s):
 LLNLJRNL769250
Journal ID: ISSN 1070664X; 960511; TRN: US2000459
 Grant/Contract Number:
 AC5207NA27344
 Resource Type:
 Accepted Manuscript
 Journal Name:
 Physics of Plasmas
 Additional Journal Information:
 Journal Volume: vol. 26; Journal Issue: no. 6; Journal ID: ISSN 1070664X
 Publisher:
 American Institute of Physics (AIP)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Citation Formats
Geyko, V. I., Dorf, M., and Angus, J. R. Gyrokinetic simulations of m=0 mode in sheared flow Zpinch. United States: N. p., 2019.
Web. doi:10.1063/1.5100542.
Geyko, V. I., Dorf, M., & Angus, J. R. Gyrokinetic simulations of m=0 mode in sheared flow Zpinch. United States. https://doi.org/10.1063/1.5100542
Geyko, V. I., Dorf, M., and Angus, J. R. Mon .
"Gyrokinetic simulations of m=0 mode in sheared flow Zpinch". United States. https://doi.org/10.1063/1.5100542. https://www.osti.gov/servlets/purl/1560115.
@article{osti_1560115,
title = {Gyrokinetic simulations of m=0 mode in sheared flow Zpinch},
author = {Geyko, V. I. and Dorf, M. and Angus, J. R.},
abstractNote = {Axisymmetric stability properties of sheared flow Zpinch plasmas are studied by making use of the gyrokinetic approximation in the longwavelength limit. Numerical simulations are carried out with the highorder finitevolume 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 particleincell 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 longwavelength part of the spectra ($kρ_i$), while failing to adequately predict shortscale ($kρ_i$) stability. Here, $k$ is the axial wavelength vector and $ρ_i$ is the ion gyroradius.},
doi = {10.1063/1.5100542},
journal = {Physics of Plasmas},
number = no. 6,
volume = vol. 26,
place = {United States},
year = {2019},
month = {6}
}
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