The proposed Circular Electron Positron Collider (CEPC) imposes new challenges for the vertex detector in terms of pixel size and material budget. A Monolithic Active Pixel Sensor (MAPS) prototype called TaichuPix, based on a column drain readout architecture, has been developed to address the need for high spatial resolution. In order to evaluate the performance of the TaichuPix-3 chips, a beam test was carried out at DESY II TB21 in December 2022. Meanwhile, the Data Acquisition (DAQ) for a muti-plane configuration was tested during the beam test. This work presents the characterization of the TaichuPix-3 chips with two different processes, including cluster size, spatial resolution, and detection efficiency. The analysis results indicate the spatial resolution better than 5 μm and the detection efficiency exceeds 99.5 % for both TaichuPix-3 chips with the two different processes.
@article{arxiv.2311.05932,
title = {Beam test of a 180 nm CMOS Pixel Sensor for the CEPC vertex detector},
author = {Tianya Wu and Shuqi Li and Wei Wang and Jia Zhou and Ziyue Yan and Yiming Hu and Xiaoxu Zhang and Zhijun Liang and Wei Wei and Ying Zhang and Xiaomin Wei and Xinhui Huang and Lei Zhang and Ming Qi and Hao Zeng and Xuewei Jia and Jun Hu and Jinyu Fu and Hongyu Zhang and Gang Li and Linghui Wu and Mingyi Dong and Xiaoting Li and Raimon Casanova and Liang Zhang and Jianing Dong and Jia Wang and Ran Zheng and Weiguo Lu and Sebastian Grinstein and João Guimarães da Costa},
journal= {arXiv preprint arXiv:2311.05932},
year = {2023}
}