Essentially different distributions of current in the inverse problem for the Grad-Shafranov equation |
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Authors: | A S Demidov and V V Savel’ev |
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Institution: | (1) Control Systems Group, Nehajska 62, 10110 Zagreb, Croatia |
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Abstract: | The paper answers a question debated by physicists for many years. It is proved that, for almost equal gradients of the magnetic
flux u at its zero-level curve ∂ω, which is the piecewise smooth boundary of a simply-connected domain ω ⋐ ℝ2, the inverse problem for the Grad-Shafranov equation of plasma equilibrium in a tokamak (in the cylindrical approximation)
admits essentially different profiles of distributions f
u
: ω ∋ (x, y) ↦ f(u(x, y)) = u
xx
(x, y) + u
yy
(x, y) ⩾ 0 in the class of third-order polynomials f(u) = Σ
m=03
a
m
u
m
. |
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Keywords: | |
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