The DAQ system for a beam detection system based on TPC-THGEM

A beam detection system has been developed for tracks, position and energy calibration of electron, which consists of a TPC detector1, a PDD2, a detector to be calibrated and a silicon-based energy detector. Its data acquisition(DAQ) system aims to realize readout, event built, online monitoring and reconstructing for 511 channels of TPC and 200 channels of PDD in 100Hz trigger rate provided by the electron beam device. In our design, the DAQ system is a small scale distributed system, which has been divided into two parts. One part communicates with readout electronics, based on client-server architecture, we call it ROS(Readout System). The other part receives sub-event from ROSs, merges and processes event data in each DAQ component based on DAQ-Middleware software framework, we named it ODP(Online Data Processing). The two parts running independently, which improves the performance, scalability and maintainability of the whole system. This paper will present the system and software architecture design, implement of the DAQ software and evaluation of its ROS performance.