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Stable MHD modes have been externally excited by electrode exciters placed at the edge of the CHS heliotron/torsatron plasma. The excited modes are related to the rational surface m = 3/n = 2 (m, n: poloidal and toroidal mode number, respectively) near the edge. These stability margins can be estimated based on the plasma response to externally applied small magnetic field perturbations. This experiment suggests a possibility that the stability margin of MHD modes can be investigated by applying small magnetic field perturbations externally.

Excitation of Stable MHD Mode Using Electrodes on the Compact Helical System Plasmas