| CMS Note | |
| Report number | CMS-CR-2018-163 |
| Title | First results from the CMS SiPM-based hadronic endcap calorimeter |
| Author(s) | De Guio, Federico (Texas Tech.) |
| Collaboration | CMS Collaboration |
| Publication | 2019 |
| Imprint | 15 Aug 2018 |
| Number of pages | 8 |
| In: | J. Phys.: Conf. Ser. 1162 (2019) 012009 |
| In: | 18th International Conference on Calorimetry in Particle Physics, Eugene, Usa, 21 - 25 May 2018, pp.012009 |
| DOI | 10.1088/1742-6596/1162/1/012009 |
| Subject category | Detectors and Experimental Techniques |
| Accelerator/Facility, Experiment | CERN LHC ; CMS |
| Abstract | The CMS hadronic calorimeter employs a plastic-scintillator-based endcap detector. In early 2017, a 20$^{\circ}$ wedge of the endcap was upgraded with silicon photomultipliers (SiPMs) and readout electronics based on the QIE11 digitizer. Based on the excellent experience with this 20$^{\circ}$ pilot system in 2017, the entire endcap detector was upgraded with SiPMs in early 2018. We report on the first ever operation of SiPMs in a high-rate collider detector. We compare SiPM performance to that of the previous hybrid photodiode / QIE8-based readout and describe how the factor three improvement in photon-detection efficiency, increased longitudinal segmentation, and improved response stability allow for mitigation of scintillator radiation damage and simplified calibration. We report in situ measurements of radiation-induced SiPM dark current. Overall, we show that the upgraded SiPM-based system brings more than 50\% improvement in radiation-induced response degradation. |
| Copyright/License | Publication: (License: CC-BY-3.0) |
Corresponding record in: Inspire
Element opprettet 2018-08-29, sist endret 2022-01-14
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