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

• Published in: Nuclear science and techniques Vol. 34; no. 9
• Main Authors: Liu, Tao, Song, Hai-Sheng, Yu, Yu-Hong, Yan, Duo, Sun, Zhi-Yu, Tang, Shu-Wen, Lu, Fen-Hua, Wang, Shi-Tao, Zhang, Xue-Heng, Li, Xian-Qin, Yang, Hai-Bo, Fang, Fang, Zhang, Yong-Jie, Ma, Shao-Bo, Ong, Hooi-Jin, Zhao, Cheng-Xin
• Format: Journal Article
• Language: English
• Published: Singapore Springer Nature Singapore 01.09.2023
• Subjects: Beam Physics; Nuclear Energy; Particle Acceleration and Detection; Particle and Nuclear Physics; Physics; Physics and Astronomy; CsI(Tl) array; Moving average filter; On-line particle identification algorithms; On-line digital algorithms; Moving window deconvolution
• ISSN: 1001-8042; 2210-3147
• DOI: 10.1007/s41365-023-01272-6

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.