Köln 2025 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 5: Poster

MS 5.3: Poster

Dienstag, 11. März 2025, 17:30–19:00, Foyer Physik

Investigation of a New Control Loop for the Stability of the Cologne 10 MV AMS System — •Marcus Sickmöller, Markus Schiffer, Gereon Weingarten, and Dennis Mücher — Institute for Nuclear Physics, University of Cologne

This work focuses on improving the voltage stability of the 10 MV tandem accelerator at the University of Cologne for improved Accelerator Mass Spectrometry (AMS) measurements. AMS requires pulsed ion beams with highly stable beam energies for precise isotopic ratio measurements, such as Fe-60 and Mn-53. Until now, the slit control mode, which offers superior long-term voltage stability (50-100 V/MV compared to 500-1000 V/MV in the Generating Voltmeter (GV) mode), could not be utilized due to the pulsed nature of AMS beams.

In this research project, modifications to the accelerator enabled the slit control mode to be applied for the first time with pulsed beams. A comparative analysis showed that the slit control mode significantly reduces beam instability caused by voltage fluctuations, enhancing measurement precision. However, challenges were observed during extended non-active pulse times, indicating areas for further optimization.

This work provides a starting point for improving terminal voltage stability in pulsed beam operation, making it comparable to that of non-pulsed beams.