Stabilization of m=1 Helical Instability by Means of Feedback Field

概要

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A method is presented for theoretically stabilizing the m=1 helicalmode instability of the current-carrying plasma; the method consists in applying the controlled helical feedback field, proportional to the displacement. The normal-mode method including the restoring force due to the feedback field is adopted in order to investigate the stability criterion; it is shown that the plasma can be stabilized if the feedback gain G satisfies the condition in the absence of the conducting wall G>(2nq(1-nq))/(α+nq), where the parameter α represents the current distribution, n is the mode number of the longitudinal direction and q the safety factor. The example of G is calculated for a Tokamak-type plasma.
社団法人日本物理学会の論文
1974-10-15