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A theoretical determination has been performed of the temperature profiles in presence of symmetry-breaking magnetic perturbations and localized heat sources in magnetically confined plasmas of thermonuclear interest. The evolution of m=1 magnetic islands, associated with sawtooth relaxation oscillations commonly observed in Tokamak experiments has been studied. A Hamiltonian for magnetic field lines consistent with Kadomtsev's sawtooth model is derived. Assuming an infinite heat diffusivity along magnetic field lines, temperature profiles are obtained by means of a simple numerical model, which solves the heat balance equation in presence of m=1 magnetic islands and a localized heat source simulating electron cyclotron radio frequency heating (ECRF), a plasma heating technique used in various tokamaks including the Lausanne experiment TCV.

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Authors: ROSSI E, Politecnico di Torino (IT);PORCELLI F, Politecnico di Torino (IT)
Bibliographic Reference: Article: Proceedings of Frühjahrstagung 1998 der Schweizerische Physikalischen Gesellschaft (1998)
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