Geometric curvature effect on suppressing the Ion-Temperature-Gradient mode near the magnetic axis

2025/01/06 by T.S. Wu, Shaojie Wang, Wu, Tiannan +1
Engineering · #Characterization and Applications of Magnetic Nanoparticles #FOS: Physical sciences #Laser-induced spectroscopy and plasma #Plasma Diagnostics and Applications #Plasma Physics (physics.plasm-ph)

paper · pdf · doi:10.48550/arxiv.2501.02960

openalex publication_date 2025/01/06 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

Global gyrokinetic simulation of the ion temperature gradient mode shows that the radial electric field (E_r) well upshifts the critical temperature gradient near the magnetic axis, in the weak but not in the strong magnetic shear configuration. The geometric curvature effect significantly influences the E × B shear and the wave number near the axis, so that the E_r well suppresses the high-n modes but has little effect on the low-n modes, which are suppressed by the weak magnetic shear effect. This new finding unravels the formation mechanism of the internal transport barrier in the weak central magnetic shear discharges.

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