2015/09/14 by J. H. E. Proll, P. Helander, J. W. Connor +1 · 1 citation
Physics and Astronomy · #physics.plasm-ph
paper · pdf · doi:10.1103/physrevlett.108.245002
published as Phys. Rev. Lett. 108, 245002 (2012)
arxiv created 2015/09/14 · arxiv updated 2015/09/15
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.