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报告题目；Resistive instabilities in general toroidal plasmas with neoclassical bootstrap currents
报 告 人：石同辉 副研究员
主 持 人：孙有文 研究员
时 间：2025年7月25日（星期五）下午14:00-15:00
地 点：8-2楼224会议室
报告内容简介：
Using a neoclassical fluid model, we derived the singular layer equations modified by bootstrap currents and also obtained the dispersion relations. Additionally, we provided the stable criterion of resistive interchange mode D_Rbs and the critical value \Delta_cbs of tearing mode stability parameter \Delta' characterizing the external ideal MHD region. It is found that, in tokamak plasmas with positive magnetic shear, bootstrap currents has a destabilizing effect on resistive interchange modes, which not only increases the value of stable criterion but also enhances the growth rate. Additionally, it has a stabilizing effect on the growth rate of neoclassical tearing mode in a low growth rate region. However, bootstrap currents can obviously decrease the critical value \Delta_c, where tearing mode is stable when \Delta'<\Delta_cbs. In plasmas with negative magnetic shear, the opposite conclusion holds. Furthermore, the coupling effect between bootstrap currents and Pfirsch-Schlüter currents via magnetic field curvature is first found, always has a stabilized influence on resistive interchange mode, and can increase the value of \Delta_c. This coupling effect is dependent of the sign of magnetic shear and can be enhanced in low-aspect-ratio tokamaks (such as spherical tokamaks) or in plasma regions with low magnetic shear (as designed in ITER hybrid scenarios). Our results are valid to low n resistive instabilities in toroidal plasmas with arbitrary aspect ratio and \beta. Overall, this investigation has broad parametric applications and deepens our understanding of the physical mechanisms underlying the influence of neoclassical effects on resistive instabilities.
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