Nonlinear evolution of double tearing modes in tokamaks

E. Fredrickson, M. Bell, R. V. Budny, E. Synakowski

Research output: Contribution to journalArticlepeer-review

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Abstract

The Δ′ formalism with neoclassical modifications has proven to be a useful tool in the study of tearing modes in high β, collisionless plasmas. In this paper the formalism developed for the inclusion of neoclassical effects on tearing modes in monotonie q-profile plasmas is extended to plasmas with hollow current profiles and double rational surfaces. First, the classical formalism of tearing modes in the Rutherford regime in low beta plasmas is extended to q profiles with two rational surfaces and it is shown that this formalism is readily extended to include neoclassical effects. The evolution of a double tearing mode on the Tokamak Fusion Test Reactor is then simulated. Reasonable agreement is found for the outer island, but the stabilizing effect of the neoclassical term is overly large for the inner island.

Original languageEnglish
Pages (from-to)4112-4120
Number of pages9
JournalPhysics of Plasmas
Volume7
Issue number10
DOIs
StatePublished - Oct 2000

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