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Author(s):
T. Hayashi, T. Sato, H.J. Gardner and J.D. Meiss
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Title:
Evolution of Magnetic Islands in a Heliac
Date of publication:
Sep.1994
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Key words:
heliac, three dimensional equilibrium, magnetic island, self-healing of magnetic island, finite pressure effect, homoclinic bifurcation, stellarator
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Abstract:
Simulations of three-dimensional equilibria in the H-1 Heliac with the HINT code show that the size of a dangerous magnetic island should increase with plasma pressure but that a destruction of the equilibrium at low beta is avoided because the rotational transform evolves to exclude the rational surface surface concerned. At higher pressures there is evidence of near-resonant flux surface deformations which may lead to an equilibrium limit. A reconnected equilibrium at still higher pressures exhibits a double island structure which is similar t homoclinic phase portraits which have been observed after separatrix reconnection in Hamiltonian systems.
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