Global Gyrokinetic Simulation of Tokamak Edge Pedestal Instabilities

被引：48

作者：

Wan, Weigang ^{[1
]}

Parker, Scott E. ^{[1
]}

Chen, Yang ^{[1
]}

Yan, Zheng ^{[2
]}

Groebner, Richard J. ^{[3
]}

Snyder, Philip B. ^{[3
]}

机构：

[1] Univ Colorado, Dept Phys, Boulder, CO 80309 USA

[2] Univ Wisconsin, Madison, WI 53706 USA

[3] Gen Atom Co, San Diego, CA 92186 USA

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 109卷 / 18期

关键词：

TRANSPORT; MICROTURBULENCE; ITER;

D O I：

10.1103/PhysRevLett.109.185004

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Global electromagnetic gyrokinetic simulations show the existence of near threshold conditions for both a high-n kinetic ballooning mode (KBM) and an intermediate-n kinetic version of peeling-ballooning mode (KPBM) in the edge pedestal of two DIII-D H-mode discharges. When the magnetic shear is reduced in a narrow region of steep pressure gradient, the KPBM is significantly stabilized, while the KBM is weakly destabilized and hence becomes the most-unstable mode. Collisions decrease the KBM's critical beta and increase the growth rate.

引用

页数：5

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