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Circulating-particle-induced Alffen instabilities in optimized stellarators and losses of #alpha#-particles in a Helias reactor

  • Kolesnichenko, Ya.I.
  • Lutsenko, V.V.
  • Max-Planck-Institut fuer Plasmaphysik, G...
Publication Date
Jan 01, 2001
OpenGrey Repository


The work investigates the Alfven instabilities that can be driven by circulating energetic ions in optimized stellarators of Wendelstein line. A general expression for the growth rate of the instabilities is obtained and analyzed. It is shown that the absence of the axial symmetry makes it possible that various types of Alfven eigenmodes will be destabilized; both the kind of destabilized Alfven eigenmodes and the type of the resonances driving the instability may differ from those in tokamaks. In particular, an important role of the helicility-induced resonance is predicted. The upper limits of the local energy losses of circulating #alpha#-particles caused by various Alfven instabilities in a four-period Helias reactor are evaluated. It is found that certain destabilized Alfven eigenmodes will affect only alphas with the energy well below 3.5 MeV, which seems to open a possibility to remove the helium ash by exciting the corresponding Alfen eigenmodes by either energetic particles or an antenna system. (orig.) / Available from TIB Hannover: RA 71(III/269) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische Informationsbibliothek / SIGLE / DE / Germany

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