Design and experimental study of fast response α-particle energy spectrum readout system based on 4H-SiC detector

Yong Ma; Shuangying Liu; Shuhuan Liu; Xuan Wang; Zhongliang Li; Yanli Xiong; Fanjun Meng; Lei Wu; Youjun Huang; Jun Zhang; Haodi Li; Bingjun Li; Guohe Zhang; Carlo Ettore Fiorini

doi:10.1117/12.2663252

4 April 2023 Design and experimental study of fast response α-particle energy spectrum readout system based on 4H-SiC detector

Yong Ma, Shuangying Liu, Shuhuan Liu, Xuan Wang, Zhongliang Li, Yanli Xiong, Fanjun Meng, Lei Wu, Youjun Huang, Jun Zhang, Haodi Li, Bingjun Li, Guohe Zhang, Carlo Ettore Fiorini

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Proceedings Volume 12617, Ninth Symposium on Novel Photoelectronic Detection Technology and Applications; 126170O (2023) https://doi.org/10.1117/12.2663252
Event: 9th Symposium on Novel Photoelectronic Detection Technology and Applications (NDTA 2022), 2022, Hefei, China

Abstract

In this paper, based on the I-V, C-V characteristics of 4H-SiC PIN detector and the characteristics of output current signal, two front-end readout circuits with different conversion gains and a digital data acquisition system (DAQ) based on high-speed ADC (AD9226) and FPGA (Zynq7020) were designed and developed. The front-end circuit of the detector is a charge sensitive amplifier circuit based on the high bandwidth operational amplifier (ADI ADA4817), which completes the Q-V conversion and filter shaping of the charge signal. The data acquisition system (DAQ) converts the front-end signal to analog with a resolution of 12 bits and a sampling rate of 50MSPS, and collects, stores and analyzes the energy spectrum data, and finally sends it to the upper computer through serial port. The conversion gain of the front-end circuit and the energy resolution of the system to α particles are measured and analyzed. The conversion gains of the designed two front-end readout circuits are 4.11V/pC and 8.42V/pC respectively in the dynamic range of input charge of 20~420fC and 20~200fC, the integral nonlinearity is 0.52% and 2.6% respectively, and the highest counting rates are 1MHz and 500kHz respectively. The 239Pu α source with factory activity of 6.0×105Bq was used for energy spectrum readout test of the system. The energy resolution of 4H-SiC detection system composed of two front-end readout circuits with different conversion gains is 6.94% and 7.96% respectively.

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Yong Ma, Shuangying Liu, Shuhuan Liu, Xuan Wang, Zhongliang Li, Yanli Xiong, Fanjun Meng, Lei Wu, Youjun Huang, Jun Zhang, Haodi Li, Bingjun Li, Guohe Zhang, and Carlo Ettore Fiorini "Design and experimental study of fast response α-particle energy spectrum readout system based on 4H-SiC detector", Proc. SPIE 12617, Ninth Symposium on Novel Photoelectronic Detection Technology and Applications, 126170O (4 April 2023); https://doi.org/10.1117/12.2663252

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KEYWORDS

Sensors

Silicon carbide

Analog electronics

Resistance

Data acquisition

Plutonium

Field programmable gate arrays

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