Microturbulence in DIII-D tokamak pedestal. II. Electromagnetic instabilities
- Univ. of California, Irvine, CA (United States)
Here, gyrokinetic simulations have been used to identify electromagnetic microinstabilities in the H-mode pedestal region of DIII-D shot 131 997 using global gyrokinetic code GTC. It was found that dominant instability at the top of the pedestal is the ion temperature gradient mode (ITG). In the maximum gradient location the most unstable mode is the kinetic ballooning mode (KBM) for the dominant poloidal wavenumber κ0≈1 cm-1. For shorter wavelengths the dominant instability is the trapped-electron mode (TEM). In this work, we have shown the ITG–KBM transition at the pedestal top, and TEM–KBM transition in the steep pressure gradient region as plasma pressure increases while gradients remain unchanged.
- Research Organization:
- Univ. of California, Oakland, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Univ. of California, Irvine, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- Grant/Contract Number:
- AC02-05CH11231; AC05-00OR22725; SC0010416
- OSTI ID:
- 1565346
- Alternate ID(s):
- OSTI ID: 1238832
- Journal Information:
- Nuclear Fusion, Vol. 55, Issue 9; ISSN 0029-5515
- Publisher:
- IOP ScienceCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Kinetic particle simulations in a global toroidal geometry
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journal | August 2019 |
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