Bremen 2017 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 2: Helmholtz Graduate School I

P 2.3: Vortrag

Montag, 13. März 2017, 09:20–09:45, HS 1010

Impact of 3D Magnetic Perturbations on Divertor Heat Load in ASDEX Upgrade — •Michael Faitsch, Bernhard Sieglin, Thomas Eich, Albrecht Herrmann, Wolfgang Suttrop, and the ASDEX Upgrade Team — Max-Planck-Institute for Plasma Physics, Boltzmannstr. 2, D-85748 Garching, Germany

The reduction of transient heat loads due to edge localized modes (ELM) in H-mode is required for the sustained operation of ITER/DEMO. The application of 3D magnetic perturbation (MP) fields is investigated as a method for ELM control and full ELM suppression which has recently been established on ASDEX Upgrade (AUG). However, these 3D fields lead to toroidal asymmetries of the heat load pattern in the divertor that may be problematic for future devices. AUG is equipped with a versatile coil set and a high resolution infrared (IR) camera system to characterize the impact of MPs on divertor heat loads to the highest accuracy. The 2D heat flux with constant divertor conditions in L- and H-mode is studied in AUG with slow rotating (1 Hz) n = 1,2,3 MP fields. In H-mode both ELM and inter-ELM data is obtained.

The resulting 2D heat flux pattern varies for distinct differential phases. The presented data indicate that at least in L-Mode enhanced cross-field transport due to the MP is negligible. With increasing density the characteristic of the 2D heat flux structure is reduced. This is accredited to the increase of the divertor power spreading S. However, ELM filaments and divertor striations lock to the perturbation leading to enhanced sputtering at distinct toroidal locations.