1981 年 50 巻 6 号 p. 1823-1824
Compact toroidal plasma has been experimentally obtained in a drum-type copper vessel on injecting an annular plasma stream from a magnetized plasma gun. Toroidal and poloidal magnetic fields, Bt and Bp, of the plasma toroid show a typical exponential decay with 110 μs and no MHD instability is observed. Experimental data of Bt and Bp configuration for long confinement are described fairly well by the model, which is the fundamental-mode state of the minimum energy force-free equilibrium estimated from the low-β limit Grad-Shafranov equation. The configuration of the stable plasma is hence fully-determined by the metal vessel geometry.
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