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Both neoclassical theory and certain turbulence theories of particle transport in tokamaks predict the existence of bootstrap (ie. pressure-driven) currents. Two new applications of this form of noninductive current are considered in this work. The first, an earlier model of the nonlinearly saturated m = 1 tearing mode, is extended to include the stabilising effect of a bootstrap current inside the island and is used to explain several observed features of the so-called snake. The second application involves an AC form of bootstrap current, produced by pressure-gradient fluctuations. It is suggested that a time-dependent, RF power source can be used to produce localised pressure fluctuations of suitable frequency and amplitude to implement the dynamic stabilisation method for suppressing gross modes in tokamaks - the jitter method.

Additional information

Authors: THYAGARAJA A, AEA Fusion, Culham Laboratory, Abingdon, Oxon. (GB);HAAS F A, AEA Fusion, Culham Laboratory, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: AEA FUS 223 EN (1993) 15 pp.
Availability: Available from the Librarian, UKAEA, Culham Laboratory, Abingdon, Oxon. OX14 3DB (GB)
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