SAMOP 2023 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 7: Poster
MS 7.4: Poster
Donnerstag, 9. März 2023, 16:30–19:00, Empore Lichthof
A Faraday cup for absolute ion beam current determination at the RISIKO mass separator — •Raphael Hasse1, Sebastian Berndt1, Vadim Gadelshin1, Christoph E. Düllmann1,2,3, Tom Kieck2,3, Nina Kneip4, and Klaus Wendt1 — 1Johannes Gutenberg-Universität Mainz — 2GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt — 3Helmholtz-Institut Mainz — 4Leibniz Universität Hannover
Faraday cups are commonly used for ion beam current measurements. They provide an easy and robust way to quantitatively determine ion currents for different applications in mass spectrometry, accelerator operation and others. Based on comparative measurements using γ spectroscopy, which indicated a systematic underestimation of the ion beam current in earlier measurements, a new Faraday cup was developed and characterized at the RISIKO mass separator of the Johannes Gutenberg-University Mainz. During this work several target shapes and repeller configurations were investigated in simulations, optimized to compensate and minimize errors due to the loss of charged secondary particles, i. e., secondary electrons and sputtered secondary ions. Calibration measurements with 165Ho using resonance ionization mass spectrometry confirm an absolute quantification of ion beams in the range of 100 pA to 100 nA with a precision of better than 5 %.