Köln 2025 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 23: Poster
HK 23.32: Poster
Tuesday, March 11, 2025, 17:30–19:00, Foyer Physik
Analysis of the Composition of the Beam from a Penning Ion Source at COALA — •Daniela Tandara, Kristian König, Imke Lopp, and Wilfried Nörtershäuser — IKP, Darmstadt, Germany
High-resolution collinear laser spectroscopy enables precise measurements of nuclear quantities such as the charge radius and magnetic moments through observations of isotopic shifts and hyperfine splittings. The preparation of ion beams with low energy spread is critical for such studies as it contributes to the observed linewidth. Therefore, Penning ionization gauge (PIG) sources are a viable choice for generating ions, particularly from metals. In line with the successful deployment of a comparable source at the BECOLA facility at the Facility for Rare Isotope Beams (FRIB) for the purpose of iron ionisation, a PIG source was constructed for the COALA setup at TU Darmstadt. In this work, first studies on stable Fe+ were performed to investigate suitable optical transitions for measurements on short-lived isotopes at FRIB. A velocity filter was installed downstream of the source in order to separate ion species by their mass-to-charge ratio and identify the produced ions. Initial measurements identified a significant fraction of Fe+ among other ionized species, with Fe+ intensities exceeding expectations from prior literature. These results were corroborated by time-of-flight mass spectroscopy. Laser spectroscopy in 54,56Fe+ was performed using the 3d6 4s 6D9/2 → 3d6 p 6D9/2o transition at 259.94 nm, demonstrating the suitability of measurements in the Fe+ ion for future measurements at online facilities. This project is supported by the German Research Foundation (Project-ID: 279384907 - SFB 1245).
Keywords: Penning Ionization Gauge; Laser Spectroscopy