Resilience of Quasi-Isodynamic Stellarators against Trapped-Particle Instabilities

Resilience of Quasi-Isodynamic Stellarators against Trapped-Particle Instabilities

Resilience of Quasi-Isodynamic Stellarators against Trapped-Particle Instabilities 150 150 UKAEA Opendata

Resilience of Quasi-Isodynamic Stellarators against Trapped-Particle Instabilities

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-densitygradient- 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.

Collection:
Journals
Journal:
Publisher:
Published date:
14/08/2012