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Trap-integrated fluorescence detection with silicon photomultipliers for sympathetic laser cooling in a cryogenic Penning trap

MPS-Authors
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Wiesinger,  M.       
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Bohman,  M.       
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Will,  C.       
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Erlewein,  S.       
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Jäger,  J. I.       
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Blaum,  K.       
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Mooser,  A.       
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Citation

Wiesinger, M., Stuhlmann, F., Bohman, M., Micke, P., Will, C., Yildiz, H., et al. (2023). Trap-integrated fluorescence detection with silicon photomultipliers for sympathetic laser cooling in a cryogenic Penning trap. Review of Scientific Instruments, 94: 123202. doi:10.1063/5.0170629.


Cite as: https://hdl.handle.net/21.11116/0000-000E-1BF0-5
Abstract
We present a fluorescence-detection system for laser-cooled 9Be+ ions based on silicon photomultipliers (SiPMs) operated at 4 K and integrated into our cryogenic 1.9 T multi-Penning-trap system. Our approach enables fluorescence detection in a hermetically sealed cryogenic Penning-trap chamber with limited optical access, where state-of-the-art detection using a telescope and photomultipliers at room temperature would be extremely difficult. We characterize the properties of the SiPM in a cryocooler at 4 K, where we measure a dark count rate below 1 s−1 and a detection efficiency of 2.5(3)%. We further discuss the design of our cryogenic fluorescence-detection trap and analyze the performance of our detection system by fluorescence spectroscopy of 9Be+ ion clouds during several runs of our sympathetic laser-cooling experiment.