System design for precise digitization and readout of the CSNS-WNS BaF<sub>2</sub> spectrometer

De-Liang Zhang; Ping Cao; Qi Wang; Bing He; Ya-Xi Zhang; Xin-Cheng Qi; Tao Yu; Qi An

doi:10.1088/1674-1137/41/2/026102

Chinese Physics C> 2017, Vol. 41> Issue(2) : 026102 DOI: 10.1088/1674-1137/41/2/026102

System design for precise digitization and readout of the CSNS-WNS BaF₂ spectrometer

De-Liang Zhang ^1,2 ,
Ping Cao ^1,3,, ,
Qi Wang ^1,2 ,
Bing He ^1,3 ,
Ya-Xi Zhang ^1,2 ,
Xin-Cheng Qi ^1,3 ,
Tao Yu ^1,2 ,
Qi An ^1,2

1.
State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, China
2.
Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China
3.
School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230027, China

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Abstract：
The BaF₂ (barium fluoride) spectrometer is one of the experiment facilities at the CSNS-WNS (White Neutron Source at China Spallation Neutron Source), currently under construction. It is designed to precisely measure the (n, γ) cross section, with 92 crystal elements and complete 4π steradian coverage. In order to improve the precision of measurement, in this paper, a new precise digitization and readout method is proposed. Waveform digitizing with 1 GSps sampling rate and 12-bit resolution is used to precisely capture the detector signal. To solve the problem of massive data readout and processing, the readout electronics is designed as a distributed architecture with 4 PXIe crates. The digitized signal is concentrated to the PXIe crate controller through a PCIe bus on the backplane and transmitted to the data acquisition system over gigabit Ethernet in parallel. Besides, the clock and trigger can be fanned out synchronously to every electronic channel over a high-precision distribution network. Test results show that the prototype of the readout electronics can achieve good performance and meet the requirements of the CSNS-WNS BaF₂ spectrometer.
- CSNS-WNS BaF2 spectrometer ,
- readout electronics ,
- waveform digitizing ,
- clock and trigger network

References

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De-Liang Zhang, Ping Cao, Qi Wang, Bing He, Ya-Xi Zhang, Xin-Cheng Qi, Tao Yu and Qi An. System design for precise digitization and readout of the CSNS-WNS BaF₂ spectrometer[J]. Chinese Physics C, 2017, 41(2): 026102. doi: 10.1088/1674-1137/41/2/026102

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Received: 2016-08-23
Revised: 2016-09-21

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Supported by National Research and Development plan (2016YFA0401602) and NSAF (U1530111)

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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

System design for precise digitization and readout of the CSNS-WNS BaF₂ spectrometer

Corresponding author: Ping Cao,

1. State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, China

2. Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China

3. School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230027, China

Received Date: 2016-08-23

Accepted Date: 2016-09-21

Available Online: 2017-02-05

Fund Project: Supported by National Research and Development plan (2016YFA0401602) and NSAF (U1530111)

Abstract: The BaF₂ (barium fluoride) spectrometer is one of the experiment facilities at the CSNS-WNS (White Neutron Source at China Spallation Neutron Source), currently under construction. It is designed to precisely measure the (n, γ) cross section, with 92 crystal elements and complete 4π steradian coverage. In order to improve the precision of measurement, in this paper, a new precise digitization and readout method is proposed. Waveform digitizing with 1 GSps sampling rate and 12-bit resolution is used to precisely capture the detector signal. To solve the problem of massive data readout and processing, the readout electronics is designed as a distributed architecture with 4 PXIe crates. The digitized signal is concentrated to the PXIe crate controller through a PCIe bus on the backplane and transmitted to the data acquisition system over gigabit Ethernet in parallel. Besides, the clock and trigger can be fanned out synchronously to every electronic channel over a high-precision distribution network. Test results show that the prototype of the readout electronics can achieve good performance and meet the requirements of the CSNS-WNS BaF₂ spectrometer.

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System design for precise digitization and readout of the CSNS-WNS BaF₂ spectrometer

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System design for precise digitization and readout of the CSNS-WNS BaF2 spectrometer

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System design for precise digitization and readout of the CSNS-WNS BaF₂ spectrometer

System design for precise digitization and readout of the CSNS-WNS BaF₂ spectrometer