Göttingen 2025 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 20: Magnetic Confinment Fusion/HEPP V
P 20.5: Vortrag
Donnerstag, 3. April 2025, 15:35–15:50, ZHG102
Helium exhaust studies in ASDEX Upgrade with a quadrupole mass spectrometer — •Simon Krumm1,2, Athina Kappatou1, Volker Rohde1, Thomas Pütterich1,2, Andreas Redl1, and the ASDEX Upgrade Team3 — 1Max-Planck- Institut für Plasmaphysik, 85748 Garching, Germany — 2Ludwig- Maximilians-Universität München, 80539 München, Germany — 3see the author list of H. Zohm et al. 2024 NF 64 112001
Helium is the product of the fusion reaction used in future fusion power plants. Thermalised helium dilutes the fuel and has to be efficiently removed to sustain the fusion process. To understand and optimise helium exhaust processes, diagnostics are necessary to measure helium from the plasma core all the way to the pump ducts. To measure helium in the pump ducts and to determine pumping speeds, quadrupole mass spectrometers are used. However, the low mass difference between molecular deuterium and helium makes mass spectrometry challenging. We present the application of the Threshold Ionisation Mass Spectrometry (TIMS) method to accurately measure He and D partial pressures with high time resolution. Following its performance characterisation in a laboratory we then utilise the diagnostic in ASDEX Upgrade plasmas to study helium exhaust dynamics and to determine the helium pumping speed achieved with ASDEX Upgrades's new activated charcoal coated cryopump.
Keywords: magnetic confinement; plasma diagnostic; Helium transport; mass spectrometry