Microturbulence in DIII-D tokamak pedestal. I. Electrostatic instabilities

Fulton, D. P.; Lin, Z.; Holod, I.; Xiao, Y.

doi:10.1063/1.4871387

Title: Microturbulence in DIII-D tokamak pedestal. I. Electrostatic instabilities

Journal Article · Tue Apr 15 00:00:00 EDT 2014 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4871387· OSTI ID:1565174

Fulton, D. P. ^[1]; Lin, Z. ^[2]; Holod, I. ^[1]; Xiao, Y. ^[3]

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

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.

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Research Organization:: Univ. of California, Irvine, CA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: AC02-05CH11231; AC05-00OR22725; FG02-07ER54916; SC0010416

OSTI ID:: 1565174

Journal Information:: Physics of Plasmas, Vol. 21, Issue 4; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 35 works

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