Nonlinear evolution of double tearing modes in tokamaks

Fredrickson, E.; Bell, M.; Budny, R. V.; Synakowski, E.
October 2000
Physics of Plasmas;Oct2000, Vol. 7 Issue 10
Academic Journal
The Δ[sup ′] 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 monotonic 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. © 2000 American Institute of Physics.


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