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- W2022024488 abstract "The non-linear evolution of several unstable equilibria, representative of helicity-injected spheromak configurations inside a cylindrical flux conserver, is studied by means of three dimensional resistive MHD simulations. These equilibria are force-free (∇ x B = λ(ψ)B) but do not correspond to minimum energy states, having linear λ(ψ) profiles with negative slope. Several aspects of this process are studied (magnetic energy relaxation, selective helicity decay, relaxed profiles) for different initial A slopes. The stability threshold predicted by linear theory is recovered. The results show that complete plasma relaxation leading to a uniform A, is achieved only if the initial profile is hollow enough. The evolution for cases just above the stability threshold is more gentle and does not end in a Taylor state. The final state in these cases has a linear λ(ψ) profile, as the initial condition, but with a smaller slope." @default.
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- W2022024488 date "2009-05-01" @default.
- W2022024488 modified "2023-09-25" @default.
- W2022024488 title "Selective decay in a helicity-injected spheromak" @default.
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- W2022024488 doi "https://doi.org/10.1088/1742-6596/166/1/012010" @default.
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