Bremen 2017 – scientific programme
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P: Fachverband Plasmaphysik
P 28: Helmholtz Graduate School III
P 28.2: Talk
Thursday, March 16, 2017, 14:25–14:50, HS 1010
New Massive Gas Injection system for disruption mitigation studies at ASDEX Upgrade — •Mathias Dibon1,2, Albrecht Herrmann1, Klaus Mank1, Vitus Mertens1, Rudolf Neu1,2, Gabriella Pautasso1, Bernhard Ploeckl1, and ASDEX Upgrade Team1 — 1Max-Planck-Institute for Plasmaphysics, Boltzmannstr. 2, 85748 Garching, Germany — 2Technical University Munich, Boltzmannstr. 15, 85748 Garching, Germany
Tokamak fusion devices rely on a high plasma current (several MA) for magnetic confinement. When the plasma suddenly loses most of its thermal energy due to instabilities, the plasma current disrupts. This leads to high heat loads onto the plasma facing components, large forces on the vacuum vessel due to induced eddy and halo currents in the strong toroidal magnetic field and electrons at relativistic energies. Massive gas injection (MGI) has proven to be an effective tool for mitigating heat loads, induced currents and runaway electrons. For this purpose, the tokamak ASDEX Upgrade has been equipped with a new system of in-vessel fast gas valves which are able to release a strong pulse of noble gas into the vessel within milliseconds (typical flow rate 105 Pam3/s). The system consists of two pairs of valves located on opposite toroidal positions. The first pair is composed of two identical spring-driven valves (max. gas inventory 640 Pam3), one on the mag. low field side (LFS) and one the high field side (HFS). The second pair includes a piezoelectric valve (210 Pam3) on the HFS and a spring-driven valve (400 Pam3) on the LFS. Details on the valve development and the in-vessel setup will be presented.