Collisionless trapped electron and ion temperature gradient modes in an advanced tokamak equilibrium
Journal article, 2009

The linear stability of coupled collisionless trapped electron (TE) and ion temperature gradient (ITG) modes is investigated in an International Thermonuclear Experimental Reactor [C. Gormezano , Nucl. Fusion 47, S285 (2007)]-like magnetic field configuration. An advanced fluid model in the electrostatic limit and the ballooning mode formalism are used to derive an eigenvalue equation. The growth rates and real frequencies of the most unstable modes and their eigenfunctions are calculated. The coexistence of unstable ITG and TE modes and their relative strengths with respect to the fraction of trapped electrons, wave vector, and local plasma parameters, such as density gradient, electron/ion temperature gradient, and ion to electron temperature ratio are analyzed. The influence of geometrical factors, such as local/global magnetic shear and magnetic field curvature on both ITG and TE modes is also discussed.

ballooning instability

Tokamak devices

plasma toroidal confinement

plasma temperature

Author

Ansar Mahmood

Chalmers, Signals and Systems, Signalbehandling och medicinsk teknik, Biomedical Electromagnetics

Tariq Rafiq

Lehigh University

Mikael Persson

Chalmers, Signals and Systems, Signalbehandling och medicinsk teknik, Biomedical Electromagnetics

Jan Weiland

Chalmers, Department of Radio and Space Science, Transport Theory

Physics of Plasmas

1070-664X (ISSN) 1089-7674 (eISSN)

Vol. 16 2 022503- 022503

Subject Categories

Physical Sciences

DOI

10.1063/1.3076209

More information

Created

10/8/2017