Locking of multiple resonant mode structures in the reversed-field pinch

A. K. Hansen, A. F. Almagri, D. J. Den Hartog, S. C. Prager, J. S. Sarff

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21 Scopus citations


Locking of a rotating mode by applying a resonant magnetic perturbation having the same helicity has been observed on various devices. Experiments have been carried out on the Madison Symmetric Torus reversed-field pinch (RFP) [Dexter et al., Fusion Technol. 19, 131 (1991)] which show that an externally applied magnetic perturbation can cause locking of the dominant magnetic modes (poloidal mode number m=l, toroidal mode numbers n= 5-10) when the perturbation is resonant with them. A perturbation which is not resonant (m = 0 or 2) produces no such effect. Thus, resonant torques may lock a stochastic magnetic structure arising from several modes, as likely exists in the RFP, as well as a distinct island as exists in tokamaks, although the details of the interaction are likely to be different.

Original languageEnglish (US)
Pages (from-to)2942-2946
Number of pages5
JournalPhysics of Plasmas
Issue number8
StatePublished - 1998

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics


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