Greifswald 2024 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 25: Poster III
P 25.13: Poster
Donnerstag, 29. Februar 2024, 16:30–18:30, ELP 6: Foyer
Plasma termination due to tungsten TESPEL injection in large stellarators — •Hjördis Bouvain1,2, Andreas Dinklage1, Naoki Tamura3, Hiroshi Kasahara3, Kieran McCarthy4, Daniel Medina-Roque4, Hiroe Igami3, and The LHD Experiment Team3 — 1Max-Planck-Institut for Plasma Physics, Greifswald, Germany — 2Universität Greifswald, Greifswald, Germany — 3National Institute for Fusion Science, Toki, Japan — 4Centre for Energy, Environmental and Technical Research, Madrid, Spain
Tungsten is being assessed to replace carbon as material for plasma-facing components in W7-X. In stellarators, it is assumed that exposure to massive amounts of tungsten may lead to thermal quenches but not to current quenches like in tokamaks. Still, a thermal quench releases energy rapidly and localised heat loads may affect the integrity of the plasma facing components. For first quantitative assessments of the impact of thermal quenches in helical devices, the plasma response to massive tungsten TESPEL injections ultimately leading to plasma termination was analysed in LHD. Above a threshold, plasma termination within one energy confinement time is due to the formation of cold fronts propagating from the injection point inwards to the plasma centre. We could show that the application of additional ECRH mitigates the termination process.
Keywords: tungsten; TESPEL; LHD