Turbulence, transport, and zonal flows in the Madison symmetric torus reversed-field pinch
Abstract
The robustness and the effect of zonal flows in trapped electron mode (TEM) turbulence and Ion Temperature Gradient (ITG) turbulence in the reversed-field pinch (RFP) are investigated here from numerical solutions of the gyrokinetic equations with and without magnetic external perturbations introduced to model tearing modes. For simulations without external magnetic field perturbations, zonal flows produce a much larger reduction of transport for the density-gradient-driven TEM turbulence than they do for the ITG turbulence. Zonal flows are studied in detail to understand the nature of their strong excitation in the RFP and to gain insight into the key differences between the TEM- and ITG-driven regimes. The zonal flow residuals are significantly larger in the RFP than in tokamak geometry due to the low safety factor. Collisionality is seen to play a significant role in the TEM zonal flow regulation through the different responses of the linear growth rate and the size of the Dimits shift to collisionality, while affecting the ITG only minimally. A secondary instability analysis reveals that the TEM turbulence drives zonal flows at a rate that is twice that of the ITG turbulence. In addition to interfering with zonal flows, the magnetic perturbations are found to obviatemore »
- Authors:
-
- Univ. of Wisconsin, Madison, WI (United States). Dept. of Physics
- Jakob-Brucker-Gymnasium, Kaufbeuren (Germany); Max Planck Inst. for Plasma Physics, Garching (Germany)
- Publication Date:
- Research Org.:
- Univ. of Wisconsin, Madison, WI (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES); National Science Foundation (NSF)
- OSTI Identifier:
- 1523258
- Alternate Identifier(s):
- OSTI ID: 1414036
- Grant/Contract Number:
- FG02-85ER53212; TG-PHY130027
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 24; Journal Issue: 12; 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
Williams, Z. R., Pueschel, M. J., Terry, P. W., and Hauff, T. Turbulence, transport, and zonal flows in the Madison symmetric torus reversed-field pinch. United States: N. p., 2017.
Web. doi:10.1063/1.5000252.
Williams, Z. R., Pueschel, M. J., Terry, P. W., & Hauff, T. Turbulence, transport, and zonal flows in the Madison symmetric torus reversed-field pinch. United States. https://doi.org/10.1063/1.5000252
Williams, Z. R., Pueschel, M. J., Terry, P. W., and Hauff, T. Tue .
"Turbulence, transport, and zonal flows in the Madison symmetric torus reversed-field pinch". United States. https://doi.org/10.1063/1.5000252. https://www.osti.gov/servlets/purl/1523258.
@article{osti_1523258,
title = {Turbulence, transport, and zonal flows in the Madison symmetric torus reversed-field pinch},
author = {Williams, Z. R. and Pueschel, M. J. and Terry, P. W. and Hauff, T.},
abstractNote = {The robustness and the effect of zonal flows in trapped electron mode (TEM) turbulence and Ion Temperature Gradient (ITG) turbulence in the reversed-field pinch (RFP) are investigated here from numerical solutions of the gyrokinetic equations with and without magnetic external perturbations introduced to model tearing modes. For simulations without external magnetic field perturbations, zonal flows produce a much larger reduction of transport for the density-gradient-driven TEM turbulence than they do for the ITG turbulence. Zonal flows are studied in detail to understand the nature of their strong excitation in the RFP and to gain insight into the key differences between the TEM- and ITG-driven regimes. The zonal flow residuals are significantly larger in the RFP than in tokamak geometry due to the low safety factor. Collisionality is seen to play a significant role in the TEM zonal flow regulation through the different responses of the linear growth rate and the size of the Dimits shift to collisionality, while affecting the ITG only minimally. A secondary instability analysis reveals that the TEM turbulence drives zonal flows at a rate that is twice that of the ITG turbulence. In addition to interfering with zonal flows, the magnetic perturbations are found to obviate an energy scaling relation for fast particles.},
doi = {10.1063/1.5000252},
journal = {Physics of Plasmas},
number = 12,
volume = 24,
place = {United States},
year = {Tue Dec 19 00:00:00 EST 2017},
month = {Tue Dec 19 00:00:00 EST 2017}
}
Web of Science
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