BEGIN:VCALENDAR VERSION:2.0 CALSCALE:GREGORIAN PRODID:UW-Madison-Physics-Events BEGIN:VEVENT SEQUENCE:0 UID:UW-Physics-Event-3778 DTSTART:20151102T180000Z DTEND:20151102T190000Z DTSTAMP:20260419T110703Z LAST-MODIFIED:20151026T135418Z LOCATION:2241 Physics Bldg SUMMARY:Enhanced helium exhaust due to resonant magnetic perturbations at the TEXTOR tokamak and the LHD heliotron“\, Plasma Physics (Phys ics/ECE/NE 922) Seminar\, Oliver Schmitz\, Engineering Physics\, UW DESCRIPTION:
\nHelium exhaust is the most generic task for a diver tor in magnetically confined fusion plasmas. Without sufficient helium exhaust\, it will not be possible to maintain a burning plasma. Measu rements and modeling results are presented which demonstrate that reso nant magnetic perturbations can be used to improve the helium exhaust features. We compare the dynamic ergodic divertor at the TEXTOR tokama k with the helical divertor in the LHD heliotron. It is shown that a m agnetic island in the very plasma edge can be used on both devices as a fine actuator on the helium and main plasma confinement characterist ics. Modeling with the EMC3-EIRENE plasma fluid and kinetic neutral t ransport code supports that the most critical part of the challenge is condensation of the helium which recycles many times on the surfaces outside of the confined volume and close to the exhaust devices is imp ortant to generate efficient helium exhaust. The combination of result s from modeling and experiment provide consistent evidence that a comb ination of enhanced outward helium transport with improved coupling to the exhaust devices due to the edge magnetic island induced can yield a substantially enhanced overall helium exhaust. URL:https://www.physics.wisc.edu/events/?id=3778 END:VEVENT END:VCALENDAR