Toward real-time digital pulse process algorithms for Csl(TI)detector array at external target facility in HIRFL-CSR

A fully digital data acquisition system based on a field-programmable gate array(FPGA)was developed for a CsI(Tl)array at the external target facility(ETF)in the Heavy Ion Research Facility in Lanzhou(HIRFL).To process the CsI(Tl)signals generated by y-rays and light-charged ions,a scheme for digital pulse processing algorithms is proposed.Every step in the algorithms was benchmarked using standard y and α sources.The scheme,which included a moving average filter,baseline restoration,leading-edge discrimination,moving window deconvolution,and digital charge comparison,was subsequently implemented on the FPGA.A good energy resolution of 5.7％for 1.33-MeV γ-rays and excellent α-γ identification using the digital charge comparison method were achieved,which satisfies CsI(Tl)array performance requirements.