Towards real-time digital pulse process algorithms for CsI(Tl) detector array at External Target Facility in HIRFL-CSR

Subjects: Nuclear Science and Technology >> Nuclear Detection Technology and Nuclear Electronics submitted time 2023-09-14

Liu, Tao Song, Haisheng Yu, Yuhong Yan, Duo Sun, Zhiyu Tang, Shuwen Lu, Fenhua Wang, Shitao Zhang, Xueheng Li, Xianqin Yang, Haibo Fang, Fang Zhang, Yongjie Ma, Shaobo Ong, Hooijin Zhao, Chengxin

Abstract： 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 γ-rays and light-charged ions, a scheme for digital pulse processing algorithms is proposed. Every step in the algorithms was benchmarked using standard γ 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.
 

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