Microturbulence in DIII-D tokamak pedestal. I. Electrostatic instabilities
Abstract
Gyrokinetic simulations of electrostatic driftwave instabilities in a tokamak edge have been carried out to study the turbulent transport in the pedestal of an H-mode plasma. The simulations use annulus geometry and focus on two radial regions of a DIII-D experiment: the pedestal top with a mild pressure gradient and the middle of the pedestal with a steep pressure gradient. A reactive trapped electron instability with a typical ballooning mode structure is excited by trapped electrons in the pedestal top. In the middle of the pedestal, the electrostatic instability exhibits an unusual mode structure, which peaks at the poloidal angle $θ=±π/2$. The simulations find that this unusual mode structure is due to the steep pressure gradients in the pedestal but not due to the particular DIII-D magnetic geometry. Finally, realistic DIII-D geometry appears to have a stabilizing effect on the instability when compared to a simple circular tokamak geometry.
- Authors:
-
- Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy
- Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy; Peking Univ., Beijing (China). Fusion Simulation Center
- Zhejiang Univ., Hangzhou (China). Inst. of Fusion Theory and Simulation
- Publication Date:
- Research Org.:
- Univ. of California, Irvine, CA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- OSTI Identifier:
- 1565174
- Grant/Contract Number:
- AC02-05CH11231; AC05-00OR22725; FG02-07ER54916; SC0010416
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 21; Journal Issue: 4; 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
Fulton, D. P., Lin, Z., Holod, I., and Xiao, Y. Microturbulence in DIII-D tokamak pedestal. I. Electrostatic instabilities. United States: N. p., 2014.
Web. doi:10.1063/1.4871387.
Fulton, D. P., Lin, Z., Holod, I., & Xiao, Y. Microturbulence in DIII-D tokamak pedestal. I. Electrostatic instabilities. United States. https://doi.org/10.1063/1.4871387
Fulton, D. P., Lin, Z., Holod, I., and Xiao, Y. Tue .
"Microturbulence in DIII-D tokamak pedestal. I. Electrostatic instabilities". United States. https://doi.org/10.1063/1.4871387. https://www.osti.gov/servlets/purl/1565174.
@article{osti_1565174,
title = {Microturbulence in DIII-D tokamak pedestal. I. Electrostatic instabilities},
author = {Fulton, D. P. and Lin, Z. and Holod, I. and Xiao, Y.},
abstractNote = {Gyrokinetic simulations of electrostatic driftwave instabilities in a tokamak edge have been carried out to study the turbulent transport in the pedestal of an H-mode plasma. The simulations use annulus geometry and focus on two radial regions of a DIII-D experiment: the pedestal top with a mild pressure gradient and the middle of the pedestal with a steep pressure gradient. A reactive trapped electron instability with a typical ballooning mode structure is excited by trapped electrons in the pedestal top. In the middle of the pedestal, the electrostatic instability exhibits an unusual mode structure, which peaks at the poloidal angle $θ=±π/2$. The simulations find that this unusual mode structure is due to the steep pressure gradients in the pedestal but not due to the particular DIII-D magnetic geometry. Finally, realistic DIII-D geometry appears to have a stabilizing effect on the instability when compared to a simple circular tokamak geometry.},
doi = {10.1063/1.4871387},
journal = {Physics of Plasmas},
number = 4,
volume = 21,
place = {United States},
year = {Tue Apr 15 00:00:00 EDT 2014},
month = {Tue Apr 15 00:00:00 EDT 2014}
}
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