Global Gyrokinetic Simulation of Tokamak Edge Pedestal Instabilities

被引：46
|
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.
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页数：5
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