The achievable efficiency of selective leakage of charged particles in mirror machines is investigated. The purpose of selective leakage (charged particle leakage at only one mirror or leakage at a restricted area of one mirror) is to reduce the size and cost of direct conversion equipment. Selective leakage at a restricted area of one mirror can be accomplished by providing a region in one mirror which has a local minimum in field strength. If the local minimum region intersects all plasma drift surfaces, then the precession of particles about the mirror machine axis ensures that all particles will periodically sample the local minimum. The dominance of small angle scattering will cause preferential leakage at the location of the local minimum.
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