Microtearing modes in spherical and conventional tokamaks

被引：28
|
作者：
Moradi, S. [1 ,2 ]
Pusztai, I. [1 ,2 ,4 ]
Guttenfelder, W. [3 ]
Fulop, T. [1 ,2 ]
Mollen, A. [1 ,2 ]
机构：
[1] Chalmers Univ Technol, Dept Appl Phys, S-41296 Gothenburg, Sweden
[2] Euratom VR Assoc, Gothenburg, Sweden
[3] Princeton Plasma Phys Lab, Princeton, NJ 08543 USA
[4] MIT, Plasma Sci & Fus Ctr, Cambridge, MA 02139 USA
来源：
NUCLEAR FUSION | 2013年 / 53卷 / 06期
关键词：
KINETIC-THEORY; TEARING MODES;
D O I：
10.1088/0029-5515/53/6/063025
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：
The onset and characteristics of microtearing modes (MTM) in the core of spherical (NSTX) and conventional tokamaks (ASDEX Upgrade and JET) are studied through local linear gyrokinetic simulations with GYRO (Candy and Belli 2011 General Atomics Report GA-A26818). For experimentally relevant core plasma parameters in the NSTX and ASDEX Upgrade tokamaks, in agreement with previous works, we find MTMs as the dominant linear instability. Also, for JET-like core parameters considered in our study an MTM is found as the most unstable mode. In all of these plasmas, finite collisionality is needed for MTMs to become unstable and the electron temperature gradient is found to be the fundamental drive. However, a significant difference is observed in the dependence of the linear growth rate of MTMs on electron temperature gradient. While it varies weakly and non-monotonically in JET and ASDEX Upgrade plasmas, in NSTX it increases with the electron temperature gradient.
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页数：11
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