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P: Fachverband Plasmaphysik

P 17: Poster Session II

P 17.35: Poster

Mittwoch, 2. April 2025, 16:15–18:15, ZHG Foyer 1. OG

Calibration and Operation of the Imaging Motional Stark Effect Diagnostic at ASDEX Upgrade — •Lea Hollendonner¹, Alexander Bock¹, Andreas Burckhart¹, Thomas Pütterich¹, Rainer Fischer¹, and the ASDEX Upgrade Team² — ¹Max Planck Institute for Plasma Physics, 85748 Garching, Germany — ²See author list of H. Zohm et al, 2024 Nucl. Fusion

Detailed knowledge on the current density distribution in the core of the plasma is essential in many research topics in the field of magnetic confinement nuclear fusion, examples comprising the investigation of sawtooth instabilities, flux pumping, or advanced scenario development. Experimentally, the current density distribution can be reconstructed from measurements of the magnetic field pitch angle. Of all diagnostics capable of measuring the field pitch angle in the plasma core, the Imaging Motional Stark Effect (IMSE) diagnostic offers the highest resolution. Moreover, it provides a two-dimensional image instead of data from a limited amount of channels. In order to routinely operate the IMSE with high resolution, the calibration must be equally accurate. Fine-tuning of the IMSE calibration is challenging and open to optimization. This work presents the state of the IMSE diagnostic at ASDEX Upgrade and investigates possibilities to improve the calibration of the diagnostic.

Keywords: magnetic confinement; core plasma physics; plasma diagnostics; current density; interferometry