Investigating shear flow through continuum gyrokinetic simulations of limiter biasing in the Texas Helimak

Bernard, T. N.; Stoltzfus-Dueck, T.; Gentle, K. W.; Hakim, A.; Hammett, G. W.; Shi, E. L.

doi:10.1063/5.0003904

Title: Investigating shear flow through continuum gyrokinetic simulations of limiter biasing in the Texas Helimak

Journal Article · Mon Jun 15 00:00:00 EDT 2020 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0003904· OSTI ID:1633443

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General Atomics, San Diego, CA (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Univ. of Texas, Austin, TX (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Princeton Univ., NJ (United States)

Previous limiter-biasing experiments on the Texas Helimak, a simple magnetized torus, have been inconclusive on the effect of flow shear on turbulence levels. To explore this, the first gyrokinetic simulations of limiter biasing in the Helimak using the plasma physics code Gkeyll have been carried out, and results are presented here. For the scenarios considered, turbulence is mostly driven by the interchange instability, which depends on gradients of steady state density profiles. An analysis of both experimental and simulation data demonstrates that shear rates are mostly less than than local linear growth rates, and not all requirements for shear stabilization are met. Yet, the mostly vertical shear flow has an important effect on bulk transport and experimental steady-state density profiles, and changes to the gradients correspond to changes in turbulence levels.

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Research Organization:: General Atomics, San Diego, CA (United States) Univ. of Texas, Austin, TX (United States); Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES); National Science Foundation (NSF)

Grant/Contract Number:: FG02-95ER54309; FG02-04ER54742; AC02-09CH11466; ACI-1548562; FG02-04ER-54742

OSTI ID:: 1633443

Alternate ID(s):: OSTI ID: 1633374; OSTI ID: 1668751

Report Number(s):: 2020_239; TRN: US2201198

Journal Information:: Physics of Plasmas, Vol. 27, Issue 6; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Cited by: 2 works

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