Trap-integrated fluorescence detection based on silicon photomultipliers in a cryogenic Penning trap

• Main Authors: Wiesinger, Markus, Stuhlmann, Florian, Bohman, Matthew A, Micke, Peter, Will, Christian, Yildiz, Hüseyin, Abbass, Fatma, Arndt, Bela P, Devlin, Jack A, Erlewein, Stefan, Fleck, Markus, Jäger, Julia I, Latacz, Barbara M, Schweitzer, Daniel, Umbrazunas, Gilbertas, Wursten, Elise, Blaum, Klaus, Matsuda, Yasuyuki, Mooser, Andreas, Quint, Wolfgang, Soter, Anna, Walz, Jochen, Smorra, Christian, Ulmer, Stefan
• Format: Journal Article
• Language: English
• Published: 04.08.2023
• Subjects: Physics - Atomic Physics
• DOI: 10.48550/arxiv.2308.02365

We present a fluorescence-detection system for laser-cooled 9Be+ ions based on silicon photomultipliers (SiPM) 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 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 experiment.