Berlin 2014 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 2: Magnetic Confinement I
P 2.4: Vortrag
Montag, 17. März 2014, 11:50–12:05, SPA HS202
Suppression of the runaway electron generation by massive gas injection at TEXTOR — •Andrey Lvovskiy1, Hans R. Koslowski1, and Long Zeng2 — 1Institute of Energy and Climate Research - Plasma Physics, Forschungszentrum Jülich GmbH, Jülich, Germany — 2Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, China
Runaway electrons (RE) are a serious threat for the first wall of the ITER tokamak. The mitigation of RE may be an insufficient action for the safety of such large tokamak. A safer approach is to completely suppress the generation of RE in ITER.
Massive gas injection (MGI) may be one of the possible techniques for the suppression of RE generation. However, there is still no clear evidence that MGI effects so.
TEXTOR tokamak is well-equipped for the MGI investigation. A small disruption mitigation valve (DMV) can inject an amount of particles up to 0.25 bar*liter in order to trigger the disruption and reliably generate RE. A larger DMV injects up to 9 bar*liter of Ar, Ne or He to suppress the RE due to collisions. The electron density is measured during disruption by a dispersion interferometer with time resolution of 2 mks for the reference to Connor-Hastie-Rosenbluth density.
The aim of MGI experiments at TEXTOR was to determine the influence of species, amount of injected gas and the time delay between DMVs on suppression of RE generation. The suppression of RE generation in case of sufficient MGI before the current quench has been observed.