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P: Fachverband Plasmaphysik
P 15: Poster: Theorie/Modellierung
P 15.2: Poster
Wednesday, March 14, 2012, 16:30–19:00, Poster.III
Resilience of quasi-isodynamic stellarators against trapped-particle instabilities — •Josefine Henriette Elise Proll1, Per Helander1, and John William Connor2,3 — 1Max-Planck-Institut für Plasmaphysik, Wendelsteinstraße 1, 17491 Greifswald, Germany — 2Culham Centre for Fusion Energy, Abingdon OX14 3DB, United Kingdom — 3Imperial College of Science, Technology and Medicine, London SW7 2BZ, United Kingdom
It is shown that one of the most important classes of orbit-optimized stellarators, so-called quasi-isodynamic ones, are immune to all the usual linear trapped-particle instabilities in the electrostatic and collisionless limit. This result, which is valid for frequencies below the electron-bounce frequency, follows from the requirement of positive entropy production and is thus independent of all other details of the magnetic geometry.