Abstract
Advanced fusion such as D-³He requires an ultra-high-β plasma. The field-reversed configuration (FRC) plasma is a candidate because of its intrinsic ultra-high-β: ≈1. The FRC can be produced by merging spheromaks with counter helicities. This result strongly implies that the FRC represents a new relaxed state, which is not a Taylor's state. Recently, the two-fluid relaxation theory has been developed to describe a relaxed state with finite pressure gradient such as FRC. The theory calls for an Alfvenic flow in the relaxed state. In order to drive such a fast flow, preliminary experiments have been performed to which external electrodes or non-neutral plasmas are applied.
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