SAMOP 2021 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 7: Accelerator Mass Spectrometry I
MS 7.3: Vortrag
Donnerstag, 23. September 2021, 11:30–11:45, H3
Investigation of the beam trajectory and beam profile development in the 135∘ gas-filled magnet at the AMS device for medium mass isotopes at the Cologne University — •Susan Herb, Gereon Hackenberg, Markus Schiffer, Stefan Heinze, and Alfred Dewald — Institute of Nuclear Physics, University of Cologne, Germany
First 53Mn and 60Fe test measurements revealed that improvements of the AMS set-up at the FN tandem accelerator should be made to enable the measurement of lower level isotopic ratios of 10−13 and 10−16, respectively. Therefore, we aim to improve the isobar separation of the high energy mass spectrometer and its transmission. The beam profile along the ion paths through the 135∘ gas-filled magnet was measured in the dispersive direction (x-axis) with homemade silicon pin diode detector arrays. It was measured at 4 locations along the flight path in x direction and two-dimensional (x/y) at the exit of the magnet. We also investigated the effect of using nitrogen or helium gas. The measured data was used to test our in-house developed Monte-Carlo simulation code, which simulates the ion transport in a gas-filled magnet. The first version of the code was designed for nitrogen gas and was now adapted for helium. The comparison of the calculated and the measured beam trajectories revealed that the gas density effect influencing the ion charge has to be considered [1]. The contribution will report on details of the conducted measurements and compare it with the calculations. Ongoing developments of the simulation code will be discussed. [1] Betz, 1972, Reviews of Modern Physics, 44.