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Evidence of magnetic islands in Tokamak plasmas is given by the external magnetic field fluctuations. In the CT-6B Tokamak MHD activity is detected by a poloidal array of external Mirnov coils. The beginning of MHD oscillation behavior varies by changing plasma displacement and vessel pressure. During current rise, flat and ramp down phases, polar plots of Mirnov array signals are compared with safety factor q_a=5a~2B~/RI_p near limiter that it is calculated by two different plasma radius (a) and (a-dx).
Evidence of magnetic islands in Tokamak plasmas is given by the external magnetic field fluctuations. In the CT-6B Tokamak MHD activity was detected by a poloidal array of external Mirnov coils. The beginning of MHD oscillation behavior varies by changing the plasma displacement and vessel pressure. During current rise, flat and ramp down phases, polar plots of Mirnov array signals are compared with safety factor q_a = 5a ~ 2B ~ / RI_p near limiter that it is calculated by two different plasma radius (a) and (a-dx).