The gyrokinetic dispersion relation of microtearing modes in collisionless toroidal plasmas

被引：0
|
作者：
Chandran, B. D. G. [1 ,2 ]
Schekochihin, A. A. [3 ,4 ]
机构：
[1] Univ New Hampshire, Space Sci Ctr, Durham, NH 03824 USA
[2] Univ New Hampshire, Dept Phys & Astron, Durham, NH 03824 USA
[3] Univ Oxford, Rudolf Peierls Ctr Theoret Phys, Oxford OX1 3NP, England
[4] Univ Oxford, Merton Coll, Oxford OX1 4JD, England
来源：
JOURNAL OF PLASMA PHYSICS | 2024年 / 90卷 / 02期
基金：
英国工程与自然科学研究理事会;
关键词：
fusion plasma; plasma confinement; plasma instabilities; KINETIC-THEORY; EQUILIBRIUM; TRANSPORT; DRIVEN;
D O I：
10.1017/S0022377824000175
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：
We solve the linearized gyrokinetic equation, quasineutrality condition and Ampere's law to obtain the dispersion relation of microtearing modes (MTMs) in collisionless low-$\beta$ toroidal plasmas. Consistent with past studies, we find that MTMs are driven unstable by the electron temperature gradient and that this instability drive is mediated by magnetic drifts. The dispersion relation that we derive can be evaluated numerically very quickly and may prove useful for devising strategies to mitigate MTM instability in fusion devices.
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页数：22
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