| 摘要 |
A toroidal shaped plasma mass filter for separating heavy mass ions (M2) from light mass ions (M1) includes a platform having an annular shaped surface with a circular axis of rotation located midway between the inner and outer circumferences of the platform. An arched wall covers the platform to create a plasma chamber with the wall at least at a distance "a" from the axis of rotation. A plasma source is mounted on the platform in the chamber between the axis of rotation and the wall to generate a multi-species containing light mass particles (M1) and heavy mass particles (M2). In the chamber, the toroidal component, Bphi, of a helical magnetic field, B, is crossed with an electrical field, Er, having a positive potential Vctr along the axis of rotation. The crossed magnetic and electric fields thus rotate the multi-species plasma around the axis of rotation, and thereby separate the light mass particles (M1) from the heavy mass particles (M2) in accordance with the expression Mc=ea2Bphi2/8Vctr. In this expression Mc is selected as a cut-off mass that is greater than M1 and less than M2 (M1<Mc<M2). In operation the heavy mass particles (M2) are collected on the chamber wall and the light mass particles (M1) are trapped by a collector on the platform.
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