Transient and asymptotic behavior of magnetohydrodynamic waves in flowing fusion plasmas

通过基于渐近匹配方法的简化模型和非线性模拟，我们研究了柱状等离子体中的阻性壁模稳定性和误差场效应。等离子体旋转引起波频的多普勒移，导致有理表面和Alfven共振表面的分离。如果等离子体自转足够快，Alfven共振处的奇异电流会抑制误差场的穿透和有理表面磁岛的产生。通过这些研究，我们认识到了渐近匹配方法中的一些困难，因此我们基于一种新的思想发明了一种新的匹配方法来克服这些困难。

We have studied resistive-wall-mode stability and error-field effects in a cylindrical plasma both via a reduced model based on the asymptotic matching method and via nonlinear simulations. Plasma rotation induces Doppler shift of wave frequency, which results in the separation of rational and Alfven-resonant surfaces. If the plasma rotation is fast enough, the singular current at the Alfven-resonances suppress the penetration of error fields and the generation of magnetic islands at the rational surface. Through these studies, we recognized several difficulties in the asymptotic matching method, and therefore we have invented a new matching method which can remove these difficulties based on a new idea.