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Radio-frequency preferential plugging of multi-ion-species plasma in cusped magnetic devices

The r.f. preferential plugging of multi-ion-species plasma is studied theoretically and experimentally in a magnetic-cusp plasma. In a He+, N+ and plasma He+ is effectively plugged in, while N+ and are allowed to escape freely from a container by the applied r.f. field. In a H+, and plasma, all ion species are plugged in the container. These experiments can be explained by theory.