Trigger signal pre-processing in nuclear physics experiment data acquisition systems

The realization of events trigger signal pre-processing in the nuclear physics experiment data acquisition system is briefly introduced, by using the FPGA （field-programmable gate array） chips and VHDL language. The general requirements of trigger signal processing in nuclear physics experiment are listed. The 60Co gamma spectra test experiment is introduced to detail these requirements. The trigger signal pre-processing in self-programming systems is presented. According to a given timing diagram, the trigger signal processing is realized with the VHDL language and FPGA technique. Through the actual waveform simulation and the experiments, this method is proved to be feasible and flexibility. This method can be of reference value for other data acquisition system trigger signal processing.