Physics issues of compact drift optimized stellarators

摘要

Physics issues are discussed for compact stellarator configurations which achieve good confinement by the fact that the magnetic field modulus |B| in magnetic co-ordinates is dominated by poloidally symmetric components. Two distinct configuration types are considered (1)those which achieve their drift optimization and rotational transform at low βand low bootstrap current by appropriate plasma shaping; and(2) those which have a greater reliance on plasmaβand bootstrap currents for supplying the transform and obtaining quasi-poloidal symmetry.