COMPASS is a fixed target experiment at CERN SPS aimed to study hadron structure and spectroscopy. Hadron identification in the momentum range between 3 and 55 GeV/c is provided by a large gaseous Ring Imaging Cherenkov Counter, RICH-1. To cope with the challenges imposed by the new physics program of COMPASS, RICH-1 has been upgraded by replacing four MWPC-based photon detectors with newly developed MPGD-based photon detectors. The architecture of the novel detectors is a hybrid combination of two layers of THGEMs and a Micromegas. The top of the first THGEM is coated with CsI acting as a reflective photo-cathode. The anode is segmented in pads capacitively coupled to the APV-25 based readout. The new hybrid detectors have been commissioned during the 2016 COMPASS data taking and stably operated during the 2017 run. In this paper design, construction, operation and performance aspects of the novel photon detectors for COMPASS RICH-1 are discussed.

中文翻译：

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用于升级 COMPASS RICH-1 及更高版本的基于 MPGD 的光子探测器

COMPASS 是 CERN SPS 的一项固定目标实验，旨在研究强子结构和光谱学。3 到 55 GeV/c 动量范围内的强子识别由大型气态环形成像切伦科夫计数器 RICH-1 提供。为了应对 COMPASS 新物理程序带来的挑战，RICH-1 已经升级，将四个基于 MWPC 的光子探测器替换为新开发的基于 MPGD 的光子探测器。新型探测器的架构是两层 THGEM 和 Micromegas 的混合组合。第一个 THGEM 的顶部涂有 CsI，用作反射光阴极。阳极被分割成焊盘，电容耦合到基于 APV-25 的读数。新型混合探测器已在 2016 年 COMPASS 数据采集期间投入使用，并在 2017 年运行期间稳定运行。在本论文设计中，