Göttingen 2025 – scientific programme
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P: Fachverband Plasmaphysik
P 10: Poster Session I
P 10.46: Poster
Tuesday, April 1, 2025, 16:15–18:15, ZHG Foyer 1. OG
Commissioning of a dispersion interferometer for disruption studies at ASDEX Upgrade — •Andrew Moreau1,2, Alexander Bock1, Kai Jakob Brunner3, Riccardo Nocentini1, Emre Sözer1, Andreas Burckhart1, Jens Knauer3, Thomas Pütterich1,2, and the ASDEX Upgrade team4 — 1Max Planck Institute for Plasma Physics, Garching, Germany — 2Ludwig Maximilian University, Munich, Germany — 3Max Planck Institute for Plasma Physics, Greifswald, Germany — 4See author list of H. Zohm et al, 2024 Nucl. Fusion
Disruptions are off-normal events where thermal and particle confinement are lost in magnetic confinement plasma devices. Future reactors carry a high risk of unmitigated disruptions causing unacceptable force and heat loads for the health of the devices. It is essential to develop instruments which can reliably track quantities, such as electron density, through the entire phase of disruptions and their mitigation schemes as we learn to characterize and control the plasma state.
At ASDEX Upgrade, two systems have measured line-integrated electron density, a 195 µ m interferometer and a 10.6 µ m two-colour interferometer. These interferometers either refract heavily during disruptions or are extremely noisy from incomplete vibration compensation and both suffer from ambiguities in the phase tracking (fringe jumps). We present the commissioning of a dispersion interferometer, probing at 5.3 µ m, which uses second-harmonic coherence conservation to intrinsically eliminate vibrational noise and is more resilient against refraction and fringe jumps from the shorter wavelength.
Keywords: diagnostics; disruptions; MHD stability; control; core plasma physics