Вплив зсуву магнітного поля на дрейфову нестійкість E × B у плазмі

• Date: 2023
• Main Authors: Nasrin, S., Das, S., Bose, M.
• Format: Article
• Language: English
• Published: Publishing house "Academperiodika" 2023
• Subjects: магнiтний зсув; дрейфова нестiйкiсть; частота зiткнень; градiєнт густини
• Online Access: https://ujp.bitp.kiev.ua/index.php/ujp/article/view/2023079
• Journal Title: Ukrainian Journal of Physics

The influence of the magnetic shear on ion drift waves has been investigated for plasmas in the plane slab geometry with a density gradient. A differential equation is derived to describe the mode structure along the density gradient. The magnetic shear localizes the mode around a mode-rational surface, which is perpendicular to the magnetic field. The non-local growth rate turned out to be smaller as compared to the shearless one. The magnetic shear stabilizes long wavelength modes (kρi < 1 ), whereas it destabilizes, as the mode tends toward the short wavelength region, where the density gradient provides a destabilizing effect for the magnetic shear-driven resistive drift mode. However, the effect due to the collision frequency is significantly low in our analysis. The combined effects of E×B flows and the magnetic shear enhance the confinement over a narrow radial region with an internal transport barrier, where stability is attained.