SMuK 2021 – scientific programme

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P: Fachverband Plasmaphysik

P 15: Magnetic Confinement V & Helmholtz Graduate School V

P 15.3: Talk

Thursday, September 2, 2021, 17:25–17:50, H5

Localization of magnetic reconnection during sawtooth crash in ASDEX Upgrade — •Oleg Samoylov, Valentine Igochine, Andreas Stegmeir, Hartmut Zohm, and The ASDEX Upgrade Team — Max Planck Institute for Plasma Physics, Boltzmannstr. 2, 85748 Garching, Germany

The work discusses the toroidal localization of magnetic reconnection during sawtooth crashes. Numerical analysis with realistic heat diffusion coefficients shows that heat distributes itself helically along the torus faster than the temporal resolution of any existing ECE diagnostics. It makes local and global (helically axisymmetric) magnetic reconnection indistinguishable for an observer, while a local crash in which the heat stays confined within a finite helical region could be distinguished. Statistical analysis of sawtooth crashes with the ECEI diagnostic is conducted in ASDEX Upgrade. Our data reveals no evidence of a local sawtooth crash and supports the numerical results.