\textit{Topmetal-II−} is a highly pixelated direct charge sensor that contains a 72×72 pixel array of 83μm pitch size. The key feature of \textit{Topmetal-II−} is that it can directly collect charges via metal nodes of each pixel to form two-dimensional images of charge cloud distributions. \textit{Topmetal-II−} was proved to measure charged particles without amplification at room temperature. To measure its performance at cryogenic temperature, a \textit{Topmetal-II−} sensor is embedded into a liquid nitrogen dewar. The results presented in this paper show that \textit{Topmetal-II−} can also operate well at this low temperature with a noise (ENC) of 12 e− lower than that at room temperature (13 e−). From the noise perspective, \textit{Topmetal-II−} is a promising candidate for the next generation readout of liquid argon and xenon Time Projection Chamber (TPC) used in experiments searching for neutrinoless double beta decay and dark matter.
@article{arxiv.1601.06955,
title = {Test of \textit{Topmetal-${II}^-$} In Liquid Nitrogen For Cryogenic Temperature TPCs},
author = {Shuguang Zou and Yan Fan and Mangmang An and Chufeng Chen and Guangming Huang and Xiaoting Li and Jun Liu and Hua Pei and Xiangming Sun and Ping Yang and Dong Wang and Le Xiao and Zhen Wang and Kai Wang and Wei Zhou},
journal= {arXiv preprint arXiv:1601.06955},
year = {2016}
}