AC-Coupled LGAD (AC-LGAD) is a new 4D detector developed based on the Low Gain Avalanche Diode (LGAD) technology, which can accurately measure the time and spatial information of particles. The Institute of High Energy Physics (IHEP) designed a large-size AC-LGAD with a pitch of 2000~\SI{}{\micro\metre} and AC pad of 1000~\SI{}{\micro\metre}, and explored the effect of N+ layer dose on the spatial resolution and time resolution. The spatial resolution varied from 36~\SI{}{\micro\metre} to 16~\SI{}{\micro\metre} depending on N+ dose for a charge corresponding to about 12 minimum ionizing particles. The jitter component of the time resolution does not change significantly with different N+ doses, and it is about 15-17 ps measured by laser. The AC-LGAD with a low N+ dose has a large attenuation factor and better spatial resolution in the central region between pads. In these specific conditions, large signal attenuation factor and low noise level are beneficial to improve the spatial resolution of the AC-LGAD sensor.
@article{arxiv.2212.03754,
title = {The performance of large-pitch AC-LGAD with different N+ dose},
author = {Mengzhao Li and Weiyi Sun and Zhijun Liang and Mei Zhao and Xiaoxu Zhang and Yuan Feng and Yunyun Fan and Tianya Wu and Wei Wang and Xuan Yang and Bo Liu and Shuqi Li and Chengjun Yu and Xinhui Huang and Yuekun Heng and Gaobo Xu},
journal= {arXiv preprint arXiv:2212.03754},
year = {2023}
}