Nuclear Techniques ›› 2019, Vol. 42 ›› Issue (6): 60402-060402.doi: 10.11889/j.0253-3219.2019.hjs.42060402

• NUCLEAR ELECTRONICS AND INSTRUMENTATION • Previous Articles     Next Articles

The development of the main detector's readout electronics for GPPD of CSNS project

Shaojia CHEN1,2,3,Yubin ZHAO1,2,3,Lixin ZENG1,2,3,Xingcheng TIAN1,2,3,Hong LUO1,2,3,Bin TANG1,2,3,Xiuku WANG1,2,3   

  1. 1. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
    2. Dongguan Institute of Neutron Science, Dongguan 523803, China
    3. State Key Laboratory of Particle Detection and Electronics, Beijing 100049, China
  • Received:2018-07-05 Revised:2019-04-08 Online:2019-06-10 Published:2019-06-18
  • About author:CHEN Shaojia, male, born in 1984, graduated from Zhengzhou University with a master’s degree in 2010, focusing on nuclear electronics and application specific integrated circuit
  • Supported by:
    Supported by National Natural Science Foundation of China Youth Fund (No.2016A030313126), the State Key Laboratory of Particle Detection and Electronics(No.SKLPDE-ZZ-201801)

Abstract: Background

The general purpose powder diffractometer (GPPD) of China spallation neutron source (CSNS) project uses the scintillation detector as the main detector.

Purpose

In order to meet the design requirements of GPPD, this study aims to develop a readout electronics with capability of data acquisition for thousands of channels and high-precision neutron detection.

Methods

Based on the design objectives, the integration and flexibility of the readout system are implemented, and the structure of "sub-board+ mainboard” is adopted. The front amplifier board uses an application specific integrated circuit (ASIC) to realize analog signal processing such as amplification, shaping and discrimination. The motherboard firmware adopts the design method of multi-level pipeline mechanism. While ensuring the parallelism and reliability of data, the dead time of data processing is reduced, and data acquisition, packaging, caching and other processing are realized. The final data is transmitted to the back-end data processing system through Gigabit Ethernet for data analysis and processing.

Results

The evaluation results of the designed and implemented readout electronics show that the minimum time resolution is 11 ns and the single channel counting rate is 200 K?s?1, and all performance indicators are better than the design objectives. All the readout electronic units have been deployed to GPPD project site and operated stably since commissioning.

Conclusion

Successful development of readout electronics for the main detector of GPPD provides a reliable guarantee for the smooth development of the spectrometer.

Key words: GPPD, Nuclear electronics, Scintillator detector, ASIC, FPGA

CLC Number: 

  • TL99