Drift-wave stability in the field-reversed configuration
Abstract
Gyrokinetic simulations of C-2-like field-reversed configuration (FRC) find that electrostatic drift-waves are locally stable in the core. The stabilization mechanisms include finite Larmor radius effects, magnetic well (negative grad-B), and fast electron short circuit effects. In the scrape-off layer (SOL), collisionless electrostatic drift-waves in the ion-to-electron-scale are destabilized by electron temperature gradients due to the resonance with locally barely trapped electrons. Collisions can suppress this instability, but a collisional drift-wave instability still exists at realistic pressure gradients. Simulation results are in qualitative agreement with C-2 FRC experiments. In particular, the lack of ion-scale instability in the core is not inconsistent with experimental measurements of a fluctuation spectrum showing a depression at ion-scales. Here, the pressure gradient thresholds for the SOL instability from simulations are also consistent with the critical gradient behavior observed in experiments.
- Authors:
-
[1];
[1];
[2];
- Univ. of California, Irvine, CA (United States)
- Tri Alpha Energy, Inc., Rancho Santa Margarita, CA (United States)
- Univ. of California, Irvine, CA (United States); Tri Alpha Energy, Inc., Rancho Santa Margarita, CA (United States)
- University of California, Los Angeles, CA (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Univ. of California, Oakland, CA (United States); UT-Battelle LLC/ORNL, Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1543837
- Alternate Identifier(s):
- OSTI ID: 1373626
- Grant/Contract Number:
- AC02-05CH11231; AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 24; Journal Issue: 8; 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; Physics
Citation Formats
Lau, Calvin K., Fulton, D. P., Holod, I., Lin, Z., Binderbauer, M., Tajima, T., and Schmitz, L. Drift-wave stability in the field-reversed configuration. United States: N. p., 2017.
Web. doi:10.1063/1.4993630.
Lau, Calvin K., Fulton, D. P., Holod, I., Lin, Z., Binderbauer, M., Tajima, T., & Schmitz, L. Drift-wave stability in the field-reversed configuration. United States. doi:10.1063/1.4993630.
Lau, Calvin K., Fulton, D. P., Holod, I., Lin, Z., Binderbauer, M., Tajima, T., and Schmitz, L. Wed .
"Drift-wave stability in the field-reversed configuration". United States. doi:10.1063/1.4993630. https://www.osti.gov/servlets/purl/1543837.
@article{osti_1543837,
title = {Drift-wave stability in the field-reversed configuration},
author = {Lau, Calvin K. and Fulton, D. P. and Holod, I. and Lin, Z. and Binderbauer, M. and Tajima, T. and Schmitz, L.},
abstractNote = {Gyrokinetic simulations of C-2-like field-reversed configuration (FRC) find that electrostatic drift-waves are locally stable in the core. The stabilization mechanisms include finite Larmor radius effects, magnetic well (negative grad-B), and fast electron short circuit effects. In the scrape-off layer (SOL), collisionless electrostatic drift-waves in the ion-to-electron-scale are destabilized by electron temperature gradients due to the resonance with locally barely trapped electrons. Collisions can suppress this instability, but a collisional drift-wave instability still exists at realistic pressure gradients. Simulation results are in qualitative agreement with C-2 FRC experiments. In particular, the lack of ion-scale instability in the core is not inconsistent with experimental measurements of a fluctuation spectrum showing a depression at ion-scales. Here, the pressure gradient thresholds for the SOL instability from simulations are also consistent with the critical gradient behavior observed in experiments.},
doi = {10.1063/1.4993630},
journal = {Physics of Plasmas},
number = 8,
volume = 24,
place = {United States},
year = {2017},
month = {8}
}
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