Hannover 2016 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 5: Poster Session- Helmholtz Graduate School for Plasma Physics
P 5.27: Poster
Montag, 29. Februar 2016, 16:30–19:00, Empore Lichthof
Divertor radiation in the ASDEX Upgrade Tokamak — •Till Sehmer1, Matthias Bernert1, Jürgen Koll1, Hans Meister1, Felix Reimold2, Marco Wischmeier1, Ursel Fantz1, and The ASDEX Upgrade Team1 — 1Max-Planck-Institut für Plasmaphysik, Boltzmannstraße 2, 85748 Garching, Germany — 2Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung - Plasmaphysik, 52425 Jülich, Germany
To reduce in ITER the expected power flux density onto the divertor target, the plasma-wall interaction in the divertor needs to be strongly reduced. The fundamental path to achieve this is using radiation from seeded impurities, whereas the localization of this radiation (e.g. inside/outside confined region), which could have an impact onto the power balance, is a key challenge. The absolute radiated power distribution can be measured by foil bolometers. To study at the ASDEX Upgrade tungsten divertor the localization and quantification of radiation, the respective line of sight density of the bolometers has been improved by two additional cameras. The divertor radiation enhanced by nitrogen (N2) seeding has been investigated, using variations of (1) the external heating power or (2) the N2 seeding rate. While in both cases the inner divertor stays fully detached, measurements indicate that the region of dominant radiation moves from the inner divertor through the X-Point into the confined region. In the outer divertor however, the measurements indicate either an immediate upwards shift or a continuous movement of the radiation away from the target, depending on experimental conditions.