Study on degradation of VUV-sensitivity of MPPC for liquid xenon scintillation detector by radiation damage in MEG II experiment

In the MEG II experiment, the liquid xenon gamma-ray detector uses Multi-Pixel Photon Counters (MPPC) which are sensitive to vacuum ultraviolet (VUV) light under a high-intensity muon beam environment. In the commissioning phase of the detector with the beam, a significant degradation in the photon...

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Bibliographic Details
Published in:arXiv.org 2022-11
Main Authors: Ieki, K, Iwamoto, T, Kobayashi, S, Mori, Toshinori, Ogawa, S, Onda, R, Ootani, W, Shimada, K, Toyoda, K
Format: Article
Language:English
Subjects:
Damage detection
Damage localization
Degradation
Gamma ray detectors
Holes (electron deficiencies)
Luminous intensity
Muons
Particle beams
Photon counters
Photons
Radiation damage
Xenon
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Summary:In the MEG II experiment, the liquid xenon gamma-ray detector uses Multi-Pixel Photon Counters (MPPC) which are sensitive to vacuum ultraviolet (VUV) light under a high-intensity muon beam environment. In the commissioning phase of the detector with the beam, a significant degradation in the photon detection efficiency (PDE) for VUV light was found, while the degradation in the PDE for visible light was much less significant. This implies that the radiation damage is localized to the surface of the MPPC where incoming VUV photons create electron-hole pairs. It was also found that the PDE can recover to the original level by thermal annealing.
ISSN:2331-8422
DOI:10.48550/arxiv.2211.09882