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

被引：19

作者：

Holod, I. ^{[1
]}

Fulton, D. ^{[1
]}

Lin, Z. ^{[1
]}

机构：

[1] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA

来源：

NUCLEAR FUSION | 2015年 / 55卷 / 09期

关键词：

microturbulence; kinetic ballooning mode; plasma pedestal; gyrokinetic;

D O I：

10.1088/0029-5515/55/9/093020

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

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 k(theta) approximate to 1 cm(-1). For shorter wavelengths the dominant instability is the trapped-electron mode (TEM). We have demonstrated 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.

引用

页数：5

共 21 条

[1] Benchmarking gyrokinetic simulations in a toroidal flux-tube [J].

Chen, Y. ;

Parker, S. E. ;

Wan, W. ;

Bravenec, R. .

PHYSICS OF PLASMAS, 2013, 20 (09)

[2] Kinetic electron closures for electromagnetic simulation of drift and shear-Alfven waves. I. [J].

Cohen, BI ;

Dimits, AM ;

Nevins, WM ;

Chen, Y ;

Parker, S .

PHYSICS OF PLASMAS, 2002, 9 (01) :251-262

[3] Gyrokinetic simulation model for kinetic magnetohydrodynamic processes in magnetized plasmas [J].

Deng, W. ;

Lin, Z. ;

Holod, I. .

NUCLEAR FUSION, 2012, 52 (02)

[4] Kinetic Instabilities that Limit β in the Edge of a Tokamak Plasma: A Picture of an H-Mode Pedestal [J].

Dickinson, D. ;

Roach, C. M. ;

Saarelma, S. ;

Scannell, R. ;

Kirk, A. ;

Wilson, H. R. .

PHYSICAL REVIEW LETTERS, 2012, 108 (13)

[5] Edge stability and transport control with resonant magnetic perturbations in collisionless tokamak plasmas [J].

Evans, Todd E. ;

Moyer, Richard A. ;

Burrell, Keith H. ;

Fenstermacher, Max E. ;

Joseph, Ilon ;

Leonard, Anthony W. ;

Osborne, Thomas H. ;

Porter, Gary D. ;

Schaffer, Michael J. ;

Snyder, Philip B. ;

Thomas, Paul R. ;

Watkins, Jonathan G. ;

West, William P. .

NATURE PHYSICS, 2006, 2 (06) :419-423

[6] Microturbulence in DIII-D tokamak pedestal. I. Electrostatic instabilities [J].

Fulton, D. P. ;

Lin, Z. ;

Holod, I. ;

Xiao, Y. .

PHYSICS OF PLASMAS, 2014, 21 (04)

[7] Improved understanding of physics processes in pedestal structure, leading to improved predictive capability for ITER [J].

Groebner, R. J. ;

Chang, C. S. ;

Hughes, J. W. ;

Maingi, R. ;

Snyder, P. B. ;

Xu, X. Q. ;

Boedo, J. A. ;

Boyle, D. P. ;

Callen, J. D. ;

Canik, J. M. ;

Cziegler, I. ;

Davis, E. M. ;

Diallo, A. ;

Diamond, P. H. ;

Elder, J. D. ;

Eldon, D. P. ;

Ernst, D. R. ;

Fulton, D. P. ;

Landreman, M. ;

Leonard, A. W. ;

Lore, J. D. ;

Osborne, T. H. ;

Pankin, A. Y. ;

Parker, S. E. ;

Rhodes, T. L. ;

Smith, S. P. ;

Sontag, A. C. ;

Stacey, W. M. ;

Walk, J. ;

Wan, W. ;

Wang, E. H. -J. ;

Watkins, J. G. ;

White, A. E. ;

Whyte, D. G. ;

Yan, Z. ;

Belli, E. A. ;

Bray, B. D. ;

Candy, J. ;

Churchill, R. M. ;

Deterly, T. M. ;

Doyle, E. J. ;

Fenstermacher, M. E. ;

Ferraro, N. M. ;

Hubbard, A. E. ;

Joseph, I. ;

Kinsey, J. E. ;

LaBombard, B. ;

Lasnier, C. J. ;

Lin, Z. ;

Lipschultz, B. L. .

NUCLEAR FUSION, 2013, 53 (09)

[8] STEEPEST-DESCENT MOMENT METHOD FOR 3-DIMENSIONAL MAGNETOHYDRODYNAMIC EQUILIBRIA [J].

HIRSHMAN, SP ;

WHITSON, JC .

PHYSICS OF FLUIDS, 1983, 26 (12) :3553-3568

[9] Verification of electromagnetic fluid-kinetic hybrid electron model in global gyrokinetic particle simulation [J].

Holod, I. ;

Lin, Z. .

PHYSICS OF PLASMAS, 2013, 20 (03)

[10] Electromagnetic formulation of global gyrokinetic particle simulation in toroidal geometry [J].

Holod, I. ;

Zhang, W. L. ;

Xiao, Y. ;

Lin, Z. .

PHYSICS OF PLASMAS, 2009, 16 (12)

← 1 2 3 →