Investigating shear flow through continuum gyrokinetic simulations of limiter biasing in the Texas Helimak
Abstract
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.
- Authors:
-
[1];
[2];
[2];
[2];
[4]
- 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)
- Publication Date:
- Research Org.:
- General Atomics, San Diego, CA (United States) Univ. of Texas, Austin, TX (United States); Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES); National Science Foundation (NSF)
- OSTI Identifier:
- 1633443
- Alternate Identifier(s):
- OSTI ID: 1633374; OSTI ID: 1668751
- Report Number(s):
- 2020_239
Journal ID: ISSN 1070-664X; TRN: US2201198
- Grant/Contract Number:
- FG02-95ER54309; FG02-04ER54742; AC02-09CH11466; ACI-1548562; FG02-04ER-54742
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 27; Journal Issue: 6; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Citation Formats
Bernard, T. N., Stoltzfus-Dueck, T., Gentle, K. W., Hakim, A., Hammett, G. W., and Shi, E. L. Investigating shear flow through continuum gyrokinetic simulations of limiter biasing in the Texas Helimak. United States: N. p., 2020.
Web. doi:10.1063/5.0003904.
Bernard, T. N., Stoltzfus-Dueck, T., Gentle, K. W., Hakim, A., Hammett, G. W., & Shi, E. L. Investigating shear flow through continuum gyrokinetic simulations of limiter biasing in the Texas Helimak. United States. https://doi.org/10.1063/5.0003904
Bernard, T. N., Stoltzfus-Dueck, T., Gentle, K. W., Hakim, A., Hammett, G. W., and Shi, E. L. Mon .
"Investigating shear flow through continuum gyrokinetic simulations of limiter biasing in the Texas Helimak". United States. https://doi.org/10.1063/5.0003904. https://www.osti.gov/servlets/purl/1633443.
@article{osti_1633443,
title = {Investigating shear flow through continuum gyrokinetic simulations of limiter biasing in the Texas Helimak},
author = {Bernard, T. N. and Stoltzfus-Dueck, T. and Gentle, K. W. and Hakim, A. and Hammett, G. W. and Shi, E. L.},
abstractNote = {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.},
doi = {10.1063/5.0003904},
journal = {Physics of Plasmas},
number = 6,
volume = 27,
place = {United States},
year = {Mon Jun 15 00:00:00 EDT 2020},
month = {Mon Jun 15 00:00:00 EDT 2020}
}
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Works referencing / citing this record:
A Deep Dive into the Distribution Function: Understanding Phase Space Dynamics with Continuum Vlasov-Maxwell Simulations
preprint, January 2020
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- arXiv
Magnetic Fluctuations in Gyrokinetic Simulations of Tokamak Scrape-Off Layer Turbulence
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