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Stability threshold of kinetic-ballooning mode in DIII-D tokamak pedestal
Author: Ihor Holod
Requested Type: Poster Only
Submitted: 2015-01-22 11:02:05
Co-authors: D. Fulton, X. Liu, S. Taimourzadeh, Z. Lin
Contact Info:
University of California Irvine
University of California
Irvine, CA 92697
USA
Abstract Text:
The pedestal height and width in tokamak H-mode operation are believed to be constrained by mesoscale peeling-ballooning modes and microinstabilities, such as kinetic ballooning mode (KBM). Previous gyrokinetic simulations searching for KBM in the DIII-D pedestal were not conclusive, and indicated the importance of nonlocal effects and the sensitivity to the geometry. In this work, we use gyrokinetic toroidal code (GTC), which has been verified for KBM simulation, to study the microturbulence in the DIII-D pedestal using realistic geometry and plasma profiles. In electromagnetic simulation using experimental pressure value, KBM is found to be marginally dominant in the maximum gradient region. Linear properties of observed KBM are investigated.
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