中国物理学会高能物理分会第十三届全国粒子物理学术会议（2021）

Large scale of data will be produced in the PandaX-4T experiment. A fast I/O library is created to speed up the data processing, which converts the recorded waveforms from the PMTs into reconstructed events, with signals identified. Convenient event data visualization is required during the data analysis. We developed the PandaX-4T Event Viewer for this purpose. The tool is running on the client-server mode. The server side is developed with C++, which will read the data file and send required information to the client via the HTTP protocol. The client is developed with the ReactJS and Electron toolset and will be running on the user’s own computer, with supports to multiple type of operating system. The waveform and hit patterns of selected events can be viewed in the client. It helps to the data selection in the PandaX-4T experiment.