Thermal Cesium Release in PMTs Revealed by Resonant Laser Spectroscopy and Its Correlation with Quantum Efficiency
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866912589810761728 |
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| author | De Benedittis, Antonio Migliozzi, Pasquale Mollo, Carlos Maximiliano Simonelli, Andreino |
| author_facet | De Benedittis, Antonio Migliozzi, Pasquale Mollo, Carlos Maximiliano Simonelli, Andreino |
| contents | We report optical evidence of cesium (Cs) evaporation from a bialkali (SbKCs) photo-cathode during controlled heating of a photomultiplier tube (PMT). A DFB laser scanned across the 852.113 nm Cs D2 line reveals absorption features only above 60 degrees Celsius, indicating thermal desorption. The absorption correlates with temperature and offers a non-invasive method to monitor photocathode degradation in sealed detectors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_13168 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Thermal Cesium Release in PMTs Revealed by Resonant Laser Spectroscopy and Its Correlation with Quantum Efficiency De Benedittis, Antonio Migliozzi, Pasquale Mollo, Carlos Maximiliano Simonelli, Andreino Optics Instrumentation and Methods for Astrophysics High Energy Physics - Experiment We report optical evidence of cesium (Cs) evaporation from a bialkali (SbKCs) photo-cathode during controlled heating of a photomultiplier tube (PMT). A DFB laser scanned across the 852.113 nm Cs D2 line reveals absorption features only above 60 degrees Celsius, indicating thermal desorption. The absorption correlates with temperature and offers a non-invasive method to monitor photocathode degradation in sealed detectors. |
| title | Thermal Cesium Release in PMTs Revealed by Resonant Laser Spectroscopy and Its Correlation with Quantum Efficiency |
| topic | Optics Instrumentation and Methods for Astrophysics High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2509.13168 |