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Abstract

In many stellarators, envisaged as fusion devices, any alpha-particle which ever gets reflected (v(parallel) = 0) is collisionlessly lost in a time which is orders of magnitude smaller than the typical slowing-down time of approximately 0.1 s. Two classes of stellarators to which this general picture does not apply are described: quasi-helically symmetric stellarators and a class of stellarators with vanishing bootstrap current in which the collisionless alpha-particle confinement sufficiently improves at finite beta. The influence of the modular ripple in optimised coil systems realising these configurations, the angular distribution of the fast alpha-particle losses, and the application of the results to alpha-particle confinement simulation experiments in next-generation stellarators are also discussed.

Additional information

Authors: LOTZ W, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);MERKEL P, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);NÜHRENBERG J, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);STRUMBERGER E, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);NUHRENBERG J, Max-Planck-Institut fur Plasmaphysik, Garching bei Munchen (DE)
Bibliographic Reference: Article: Plasma Physics and Controlled Fusion, Vol. 34 (1992) No. 6, pp. 1037-1052
Record Number: 199211200 / Last updated on: 1994-11-29
Category: PUBLICATION
Original language: en
Available languages: en