Microturbulence in DIII-D tokamak pedestal. II. Electromagnetic instabilities

Holod, I.; Fulton, D.; Lin, Z.

doi:10.1088/0029-5515/55/9/093020

Title: Microturbulence in DIII-D tokamak pedestal. II. Electromagnetic instabilities

Journal Article · Mon Aug 17 00:00:00 EDT 2015 · Nuclear Fusion

DOI:https://doi.org/10.1088/0029-5515/55/9/093020· OSTI ID:1565346

Holod, I. ^[1]; Fulton, D. ^[1]; Lin, Z. ^[1]

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.

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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

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Cited by: 13 works

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