Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027-6902, USA.
Phys Rev Lett. 2011 May 27;106(21):215002. doi: 10.1103/PhysRevLett.106.215002. Epub 2011 May 23.
Active measurements of the plasma stability in tokamak plasmas reveal the importance of kinetic resonances for resistive wall mode stability. The rotation dependence of the magnetic plasma response to externally applied quasistatic n=1 magnetic fields clearly shows the signatures of an interaction between the resistive wall mode and the precession and bounce motions of trapped thermal ions, as predicted by a perturbative model of plasma stability including kinetic effects. The identification of the stabilization mechanism is an essential step towards quantitative predictions for the prospects of "passive" resistive wall mode stabilization, i.e., without the use of an "active" feedback system, in fusion-alpha heated plasmas.
对托卡马克等离子体中的等离子体稳定性进行的主动测量揭示了动力学共振对于电阻壁模稳定性的重要性。对外加准静态 n=1 磁场的磁等离子体响应的旋转依赖性清楚地显示了电阻壁模与被俘获热离子的进动和弹跳运动之间相互作用的特征，这与包括动力学效应的等离子体稳定性微扰模型的预测相符。对稳定机制的识别是朝着对“无源”电阻壁模稳定的前景进行定量预测迈出的重要一步，即无需使用“有源”反馈系统，即可在聚变-α加热等离子体中实现。
