Göttingen 2025 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 10: Poster Session I
P 10.47: Poster
Dienstag, 1. April 2025, 16:15–18:15, ZHG Foyer 1. OG
A new imaging diagnostic for ASDEX Upgrade divertor fluctuation studies — •Manuel Herschel1,2, Michael Griener1, Tim Happel1, Tilmann Lunt1, and The ASDEX Upgrade Team3 — 1Max Planck Institute for Plasma Physics, Garching, Germany — 2Technical University of Munich, Physics Department, Chair for Plasma Edge and Divertor Physics, 85747 Garching, Germany — 3see author list of H. Zohm et al, 2024 Nucl. Fusion 64 112001
In magnetic confinement fusion devices, so-called divertors are used to distribute heat loads on the wall and control impurity influxes into the main plasma volume. Recently, the ASDEX Upgrade fusion experiment has been equipped with a new flexible upper divertor to study various power exhaust scenarios.
To investigate the effect of the different divertor configurations in ASDEX Upgrade, powerful diagnostics are necessary. In this work, a novel multi-color gas puff imaging system is presented. The system consists of a fast helium injection valve to excite localized light emission from helium neutrals and an optical setup including an image splitter, spectral filters and a fast camera. The diagnostic is optimized for timescales below 10 µ s and a spatial resolution of around 1 cm. The simultaneous imaging of two spectral lines allows compensation of shadowing effects. This enables the observation of fast turbulent structure dynamics in the divertor region.
The final setup and the design choices behind the components are presented, as well as the progress towards first measurements under various plasma conditions.
Keywords: Nuclear Fusion; ASDEX Upgrade; Gas Puff Imaging