基于类金刚石碳电极的RPC在MEG II实验中的抗辐射性能研究
Radiation Hardness Studies of RPC Based on Diamond-Like Carbon Electrodes for MEG II Experiment
AI总结：
本文针对MEG II实验开发基于类金刚石碳电极的RPC探测器，通过高强度X射线老化测试评估其耐辐射性能，发现氟沉积和绝缘体形成导致气体增益退化，并伴有经由间隔物的放电问题。
摘要：
一种基于类金刚石碳（DLC）电极的新型电阻板室（RPC）正在开发中，用于MEG II实验中的本底识别。由于计划将DLC-RPC放置在高强度和低动量的μ子束流中，因此要求其具备抗大规模辐照的耐辐射性能。本研究利用高强度X射线束进行了老化测试，以评估DLC-RPC的耐辐射性能。X射线辐照产生的累积电荷达到约54 C/cm²，约为MEG II实验预期年辐照剂量的一半。结果表明，由于氟沉积以及在DLC电极上形成的绝缘体，气体增益出现了退化。此外，还反复观察到经由间隔物发生的放电现象，并中断了DLC-RPC的运行。
英文摘要：
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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