Abstract
In the edge plasma of the CT‐6B and IRAN‐T1 tokamaks the shape of plasma column based on MHD behavior has been studied. The bulk of plasma behavior during plasma column rotation as non‐rigid body plasma has been investigated. We found that mode number and rotation frequency of plasma column are different in angle position, so that the mode number detected from Mirnov coils array located in poloidal angle on the inner side of chamber is more than outer side which it can be because of toroidal magnetic field effects. The results of IR‐T1 and CT‐6B tokamaks compared with each other, so that in the CT‐6B because of its coils number must be less, but because of its Iron core the effect of toroidal magnetic field became more effective with respect to IR‐T1. In addition, it is shown that the plasma column behaves as non‐Rigid body plasma so that the poloidal rotation velocity variation in CT‐6B is more than IR‐T1. A relative correction for island rotation frequency has been suggested in connection with IRAN‐T1 and CT‐6B tokamak results, which can be considered for optical measurement purposes and also for future advanced tokamak control design.
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