An Optimized Helical Axis Stellarator with Modulated I = 1 Helical Coil

概要

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A new helical axis stellarator with an aspect ratio of 11 based on the modulated I = 1 helical coil is presented. Bumpiness of the magnetic field comparable to the I = 1 helical component with the opposite sign is realized to reduce the neoclassical diffusivity. The bumpy field is also effective to control the bootstrap current. An optimized configuration with reduced neoclassical transport has almost flat rotational transform of 0.7 and the magnetic well at zero beta. The equilibrium beta limit determined by the Shafranov shift of the half radius shift is (β)〜 4.5% and Mercier mode is stable up to there, where (β) is a volume average beta. With the increase of beta, confinement of high energetic trapped particles is improved. Possibility of existence of a divertor configuration is also shown.
社団法人プラズマ・核融合学会の論文
1997-07-25