导体壳对电阻磁流体不稳定性的影响

结合HL-1装置的条件,采用撕裂模的准线性理论,研究了托克马克中导体壁对m=2/n=1扰动模的稳定作用。着重研究了导体壁位置,等离子体电流分布,等离子体位形对这种稳定效应的影响。结果表明,共振面的位置与壁的稳定作用有密切关系,存q_a接近于2的位形中,m=2的撕裂模扰动可以被靠近等离子体的导体壁完全抑制。导体壁的稳定效应与等离子体电流分布相联系,在一些现实的电流分布中,只要适当地压低等离子体边界区的电流密度,壁的稳定效应会更加显现出来。

EFFECT OF A CONDUCTING WALL ON RESISTIVE MHD INSTABILITIES

By using the quasi-linear theory of tearing mode,the effect of a Conducting wall on the resistive MHD instabilities has been studied under the condition of the HL-1 tokamak.It is shown that the position of the resonant surface is of paramount importance,and the m=2/n=1(m and n are the poloidal and toroidal mode number respectively)island can be completely stabilized by a close fitting conducting shell if qa is close to 2,so that it is in favour of low-g operation.The stabilizing effect of a conducting wall is closely related to the current density profile.It will be more effective when the current density in the periphery region is reduced with realistic current profiles.