Ballooning theory for micro-tearing mode in tokamak

This paper aims to investigate the impact of magnetic drift on the linear micro-tearing mode by using a kinetic approach to derive a reduced two-field eigen system in real space. Since the magnetic drift in real space has derivatives, it is more efficient to solve the mode equations in a Fourier-bal...

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Veröffentlicht in:Physics of plasmas 2023-08, Vol.30 (8)
Hauptverfasser: Xie, T., Mahajan, S. M., Hatch, D. R.
Format: Artikel
Sprache:eng
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Zusammenfassung:This paper aims to investigate the impact of magnetic drift on the linear micro-tearing mode by using a kinetic approach to derive a reduced two-field eigen system in real space. Since the magnetic drift in real space has derivatives, it is more efficient to solve the mode equations in a Fourier-ballooning representation using the two-dimensional (2D) ballooning transform. The lowest-order eigen system in the Fourier-ballooning representation consists of two integral equations, which are numerically solved using the finite difference method for both eigenvalues and wave functions. The main results will be presented through graphical eigenvalue scans for each parameter. Furthermore, we present a graphical comparison between the predictions of the ballooning theory and GENE gyrokinetic code simulation in the pedestal region.
ISSN:1070-664X
1089-7674
DOI:10.1063/5.0157408