| 摘要 |
An inverted orbit mass filter includes a cylindrical container located at a radial distance (rout) from its longitudinal axis, and a cylindrical collector located at a radial distance (rcoll) from the axis and coaxially positioned in the container to establish a plasma chamber therebetween. A uniform magnetic field is axially aligned in the chamber and an inwardly directed radial electric field is crossed with the magnetic field. A multi-species plasma including both low mass charged particles (M1) and high mass charged particles (M2) is injected into the chamber between the container (rout) and a radial distance (rin) from the axis. In their relationship to each other: rout>rin>rcoll. Inside the chamber the multi-species plasma has a low collisional density wherein there is a very low probability of particle collision. Consequently, with respective cyclotron trajectories T1 and T2 for the particles M1 and M2, when T1<(rin-rcoll) and T2>(rout-rin) then the particles M2 will be influenced by the magnetic and electric fields into collision with the collector, and the particles M1 will avoid the collector and, therefore, pass through the chamber for subsequent collection.
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