The Experiment on the Spatial Confinement of Plasma in the Heliotron B Magnetic Field

概要

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A magnetic field named the Heliotron field is produced by the electric current in a series of the pair coils wound around the discharge tube with regular intervals. The electric current in each coil of the pair differs both in intesity and direction. The lines of force near the tube axis undulate without crossing the wall. while these near the tube wall cross the wall. Thus the high temperature plasma can be produced by ohmic heating in the central region of this field being prevented from touching the wall. Recently a series of experiments were carried out in order to verify the spatial confinement of the plasma by this field. The plasma current flows only within the central region whose mean cross section diameter is about 3 cm, and the plasma has, a sharp boundary. Outside the region there is no current. The spectra from the hydrogen discharge in the Heliotron field are mainly composed of the pure Balmer series, and the impurity spectral lines are very weak or harkly perceptible. The outgases are very little in the Heliotron field discharge. The electron temperature is about 1.4×10<SUP>5</SUP> °K. From these experimental results, it could be concluded that the hot plasma is almost perfectly isolated from the stainless steel tube wall by the Heliotron magnetic field.
社団法人プラズマ・核融合学会の論文