A STELLARATOR CONFIGURATION FOR REACTOR STUDIES

A helical coil winding law has been found for a stellarator with many of the desirable properties of the Helias. High performance computer c odes make it possible to optimize the configuration over a parameter s pace of large dimension. For reactor applications an ample gap is prov ided between the coils and the plasma. Line tracing shows that the mag netic surfaces are robust. Non-linear stability at high beta is verifi ed by equilibrium calculations in three dimensions. A neoclassical the ory of transport taking quasi-neutrality into account predicts that en ergy confinement times sufficient for ignition can be achieved economi cally. For power plant studies a more attractive modular version of th is concept called the MHH stellarator is under investigation.