電磁力平衡コイルを用いたトカマク装置とプラズマの挙動

概要

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When a high magnetic field tokamak reactor is designed with reasonable sizes, the force-reduction technique is necessary. We have proposed Force-Balanced Coils(FBCs)for the purpose of vanishing of Lorentz forces exerted on the conductors and simplifying the construction of coil systems. The forcebalanced winding provides not only the toroidal magnetic fields but also the poloidal magnetic flux to induce the plasma current. The net radial force is reduced by a factor of 10 from that exerted on the toroidal magnetic field coils. We have manufactured a small tokamak device with FBCs(R_<major>/a_<minor>〜0.3/0.1m)to demonstrate plasma production and confinement. The toroidal magnetic field of 〜0.9T at the vessel center and the plasma current up to 〜10kA were achieved by two-step FBC excitation. The plasma column with T_e of 〜50eV and n_e of 〜2×10^<19>m^<-3> was well centered in the vacuum vessel.
社団法人プラズマ・核融合学会の論文
1999-03-25