Minimum

Figure B.7. Baseball coils [Post, 1987].

"Coil current

Figure B.7. Baseball coils [Post, 1987].

transport: radial particle drifts are produced that cause increased transport losses either by collisions, as in closed toroidal magnetic configurations, or by resonant processes.

Small-scale instabilities can also be generated by anisotropies in velocity space and in particular in the loss-cone. These instabilities have been shown to be much less deleterious than theoretically predicted, provided a warm plasma is injected into the mirror, and will not be considered further (see [Post, 1987] for a discussion of the various micro-instabilities in mirrors).

To overcome all these problems, advanced mirror concepts have been proposed; they are briefly reviewed in the rest of this section.

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