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Phys Rev Lett. 2012 Jun 15;108(24):245002. Epub 2012 Jun 12.

Resilience of quasi-isodynamic stellarators against trapped-particle instabilities.

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Max-Planck-Institut f├╝r Plasmaphysik, EURATOM Association, Teilinstitut Greifswald, Wendelsteinstra├če 1, 17491 Greifswald, Germany.


It is shown that in perfectly quasi-isodynamic stellarators, trapped particles with a bounce frequency much higher than the frequency of the instability are stabilizing in the electrostatic and collisionless limit. The collisionless trapped-particle instability is therefore stable as well as the ordinary electron-density-gradient-driven trapped-electron mode. This result follows from the energy balance of electrostatic instabilities and is thus independent of all other details of the magnetic geometry.

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