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arXiv · 2402.19136

Radiation Hardness Studies of RPC Based on Diamond-Like Carbon Electrodes for MEG II Experiment

Masato Takahashi·Sei Ban·Weiyuan Li·Atsuhiko Ochi·Wataru Ootani·Atsushi Oya·Hiromu Suzuki·Kensuke Yamamoto
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Abstract

A novel type of resistive plate chamber, based on diamond-like carbon (DLC) electrodes is under development for background identification in the MEG II experiment. The DLC-RPC is required to have a radiation hardness to mass irradiation since it is planned to be placed in a high-intensity and low-momentum muon beam. In this study, the aging test using a high-intensity X-ray beam was conducted to evaluate the radiation hardness of the DLC-RPC. The accumulated charge due to X-ray irradiation reached about 54 C/cm$^2$, which is approximately half of the one-year irradiation dose expected in the MEG II experiment. As a result, the degradation of the gas gain was observed due to fluorine deposition and insulators formed on the DLC electrodes. In addition, discharges via spacers were also observed repeatedly and interrupted the DLC-RPC operation.

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Masato Takahashi, Sei Ban, Weiyuan Li, Atsuhiko Ochi, Wataru Ootani, Atsushi Oya, Hiromu Suzuki, Kensuke Yamamoto. 2024-02-29. Radiation Hardness Studies of RPC Based on Diamond-Like Carbon Electrodes for MEG II Experiment. https://doi.org/10.1016/j.nima.2024.169509

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