PandaX-4T is a dark matter direct detection experiment located in China jinping underground laboratory. The central apparatus is a dual-phase xenon detector containing 4 ton liquid xenon in the sensitive volume, with about 500 photomultipliers instrumented in the top and the bottom of the detector. In this paper we present a completely new system of readout electronics and data acquisition in the PandaX-4T experiment. Compared to the one used in the previous PandaX dark matter experiments, the new system features triggerless readout and higher bandwidth. With triggerless readout, dark matter searches are not affected by the efficiency loss of external triggers. The system records single photelectron signals of the dominant PMTs with an average efficiency of 96\%, and achieves the bandwidth of more than 450 MB/s. The system has been used to successfully acquire data during the commissioning runs of PandaX-4T.
@article{arxiv.2108.03433,
title = {Readout electronics and data acquisition system of PandaX-4T experiment},
author = {Jijun Yang and Xun Chen and Changda He and Di Huang and Yanlin Huang and Jianglai Liu and Xiangxiang Ren and Anqing Wang and Meng Wang and Binbin Yan and Kai Yin and Jinqun Yang and Yong Yang and Qibin Zheng},
journal= {arXiv preprint arXiv:2108.03433},
year = {2022}
}