Jena 2013 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 17: Poster: Magnetischer Einschluss
P 17.4: Poster
Donnerstag, 28. Februar 2013, 14:00–16:00, Poster EG
Mitigation of disruptions by massive gas injection at TEXTOR — •Andrey Lvovskiy1, Hans R. Koslowski1, Michael Lehnen1, and Long Zeng1,2 — 1Institute of Energy and Climate Research - Plasma Physics, Forschungszentrum Jülich GmbH, Association EURATOM-FZJ, Trilateral Euregio Cluster, D-52425 Jülich, Germany — 2Institute of Plasma Physics, Chinese Academy of Sciences, 230031 Hefei, China
Disruptions are serious issue for safe and reliable operation of tokamak-based fusion machine. Consequences of disruptions such as electromagnetic loads, thermal loads and runaway electrons could cause damage of plasma facing components and even vacuum vessel of future large tokamak ITER. Avoidance or at least mitigation of disruptions is strongly necessary for ITER operation.
Massive gas injection (MGI) could be an efficient way of disruption mitigation. Noble gas MGI mitigates thermal and electromagnetic loads as well as runaway generation.
In this work presented experiments on disruption mitigation at TEXTOR with injection of Ar, He and Ne in wide gas pressure range.
Major diagnostics in the described experiments was a dispersion interferometer (DI). CO2-laser based DI uses separation of reference and sample beams in the frequency space instead of geometric space. Therefore DI is sustainable to influence of vibrations. Advanced modulation technique allows reliable work of DI in wide phase range as well as at rapid and strong change of phase. Because of these advantages DI is a well suitable diagnostics for density control during disruptions.