Abstract

Multiple-mirror systems offer significant enhancement of the power balance above that attainable from a conventional single-cell mirror reactor. Several multiple-mirror configurations are under experimental investigation: the tandem mirror, the high-density multiple-mirror, and the field-reversed mirror. This paper is largely devoted to tandem mirror and field-reversed mirror experiments at the Lawrence Livermore Laboratory (LLL), and briefly summarizes results of experiments in which field-reversal has been achieved. In the tandem experiment, high-energy, high-density plasmas (nearly identical to 2XIIB plasmas) are located at each end of a solenoid where plasma ions are electrostatically confined by the high positive potentials arising in the “end plug” plasmas. End plug ions are magnetically confined, and electrons are electrostatically confined by the overall positive potential of the system. The field-reversed mirror reactor consists of several small field-reversed mirror plasmas linked together for economic reasons. In the LLL Beta II experiment, generation of a field-reversed plasma ring will be investigated using a high-energy plasma gun with a transverse radial magnetic field. This plasma will be further heated and sustained by injection of intense, high- energy neutral beams.

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