Analysis of RWM in JT-60 Super-Conducting Tokamak
G. Kurita, T. Tuda, S. Takeji, S. Ishida, A. Sakasai, M. Kikuchi and M. Azumi
Japan Atomic Energy Research Institute,
Abstract.
In order to establish the way to fusion reactor, it is necessary that the plasma beta value must be greater than the value limited by ideal external kink mode without wall stabilization. The maximum beta value is represented by normalized beta, 
, as 3, which can be increased by considering the effect of the ideal wall. In the real system, however, the conducting wall has finite resistivity, and the mode appears as the resistive wall mode, RWM. We must find, therefore, the means to suppress or control RWM to obtain higher beta value.
To analyze RWM in a tokamak, we have developed the linear MHD stability code using full set of resistive MHD equations, AEOLUS-FL, with pseudo-vacuum of highly resistive plasma region. The linearized MHD equations are solved as eigen-value problem, and time integration scheme is also employed to do feedback control simulation. In these analyses, we use the equilibria of JT-60 Super-Conducting tokamak, whose maximum stable value is around 6 against both n= ballooning and n=1&2 external kink modes with ideal conducting wall placed at b/a=1.2