A seminar by Per Helander
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The W7-X stellarator has recently attained plasmas with very good confinement, comparable to the tokamak H-mode, in discharges lasting up to 40 seconds. In this talk, I will describe some of these experiments and the basic theoretical ideas underlying the design of W7-X. When followed to their logical conclusion, they lead to the concept of a quasi-isodynamic stellarator. Theoretically, such a device should benefit from a number of highly desirable properties, which are already present in W7-X but could be enhanced further in future stellarators. In particular, there should be relatively little turbulence, and hence good confinement, in plasmas with steep density profiles, as observed in the W7-X experiments.
