Köln 2025 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 2: New Methods, Technical Development I
MS 2.5: Vortrag
Montag, 10. März 2025, 18:00–18:15, HS 2 Chemie
Comparing a Conventional and an Improved Faraday Cup in an Element-Specific Analysis for Ion Beam Current Measurements — •Sarah Oehler1, Sebastian Berndt1, Vadim Gadelshin1, Raphael Hasse1, Christoph E. Düllmann1, 2, 3, Tom Kieck2, 3, Nina Kneip1, and Klaus Wendt1 — 1Johannes Gutenberg-Universität, Mainz — 2GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt — 3Helmholtz-Institut, Mainz
Faraday cups are crucial tools for ion beam current measurements in mass spectrometry, at accelerators or storage rings. Comparative measurements at the RISIKO mass separator facility in Mainz using γ-spectroscopy indicated a systematic underestimation of the ion beam current, leading to the implementation of a new Faraday cup design. This new design provides an optimized geometry and an adapted material composition for significantly improved suppression of any charged secondary particles. Within the experiment, primary ions of various elements along the Periodic Table were measured on both a conventional and the improved Faraday cup. The results show that for non-alkali and non-alkaline earth metals, the improved Faraday cup reduces loss of sputtered particles by an average of 24.8 % compared to the conventional design at 200 V repeller voltage. Further, for alkali and alkaline earth metals the corrections were observed to reach above 50 % with respect to the conventional design.
Keywords: Faraday Cup; Ion Beam Current; Mass Spectrometry; Secondary Particles