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Q: Fachverband Quantenoptik und Photonik
Q 13: Nuclear Clocks
Q 13.2: Vortrag
Montag, 2. März 2026, 17:15–17:30, P 11
Commissioning of a Low-Energy Ion Beamline for Future 229Th Nuclear Clock Applications Using a Cs Ion Source as a Proxy — •Srinivasa Pradeep Arasada1, Florian Zacherl1, Valerii Andriushkov2,3, Keerthan Subramanian1, Jonas Stricker1,2, Ke Zhang1, Yumiao Wang1,4, Darius Fenner1, Ferdinand Schmidt-Kaler1, Dmitry Budker1,2,3,5, Christoph E. Düllmann1,2,3, and Lars von der Wense1 — 1Johannes Gutenberg Universität Mainz, Germany — 2Helmholtz Institute Mainz, Germany — 3GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany — 4Fudan University, Shanghai, China — 5University of California, Berkeley, USA
The development of a 229Th nuclear clock requires robust methods for extracting and preparing low-energy thorium ion beams. As a critical step toward this goal, we report the successful commissioning of a new ion beamline, comprising a buffer-gas stopping cell for thermalization and an RFQ ion guide for beam cooling. Using a stable cesium beam as a proxy for future 229Th experiments, we have established and optimized the complete ion transport sequence. A MCP detector provided clear evidence that the ions were successfully extracted, guided, and detected. This work validates the core functionality of the apparatus and establishes the necessary baseline for subsequent efficiency measurements and the future integration of a 233U source at the University of Mainz. This project is supported by the BMFTR Quantum Futur II Grant Project *NuQuant*(FKZ 13N16295A) and DFG Project *TACTICa*(grant agreement no.495729045).
Keywords: Nuclear Clock; Buffer-gas stopping cell; Beamline