Two novel applications of bootstrap currents : Snakes and jitter stabilization
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.
Bibliographic Reference: Report: AEA FUS 223 EN (1993) 15 pp.
Availability: Available from the Librarian, UKAEA, Culham Laboratory, Abingdon, Oxon. OX14 3DB (GB)
Record Number: 199310619 / Last updated on: 1994-11-29
Original language: en
Available languages: en