Role of Trapped Electrons on Global Gyrokinetic Linear Stability of Collisionless Microtearing Modes

Joint Varenna-Lausanne International Workshop 2014

Swamy, Aditya K.^1 ; Ganesh, R.^1 ; Chowdhury, J.^2 ; Brunner, S.^3 ; Vaclavik, J.^3 ; Villard, L.^3

Institute for Plasma Research, Bhat, Gandhinagar, India^1

Department of Physics, University of Colorado, Boulder

CO

80309, United States^2

CRPP, EPFL, Lausanne

1015, Switzerland^3

关键词: Collisionless;    Large aspect ratio;    Linear Stability;    Mode structure;    Passing electrons;    Reference parameters;    Spherical Tokamak;    Trapped electrons;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/561/1/012017/pdf
DOI  :  10.1088/1742-6596/561/1/012017

来源: IOP

【 摘 要 】

Unstable collisional MicroTearing Mode (MTMs) have been found in experiments of high-β Spherical Tokamaks and are believed to be driven by drift resonance of trapped electrons. It has been recently shown that at large aspect ratio, the magnetic drift resonance of highly passing electrons is a minimal mechanism to drive the collisionless MTM unstable. In this work, a preliminary study of inclusion of trapped electrons in large aspect ratio tokamaks indicate that for the reference parameters investigated, the collisionless MTM retain their essential mode structures, while growth rates are only moderately affected.