Nuclear Techniques ›› 2018, Vol. 41 ›› Issue (12): 120402-120402.doi: 10.11889/j.0253-3219.2018.hjs.41.120402


A prototype silicon strip detector for space astronomy

WEI Jiaju1,2   

  1. 1 Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, China;
    2 Key Laboratory of Dark Matter and Space Astronomy, Chinese Academy of Sciences, Nanjing 210008, China
  • Received:2018-07-20 Revised:2018-10-20 Online:2018-12-10 Published:2018-12-13
  • Supported by:
    Supported by National Natural Science Foundation of China (No.11503095), Strategic Pioneer Program on Space Science of Chinese Academy of Sciences (No.XDA15010200)

Abstract: [Background] One of the most attractive subjects in the astronomical observation is the γ-ray detection in space astronomy. Recent research shows that the spectrum and distribution of the high-energy γ-ray can be utilized to explore the dark matter's distribution and physical characteristics. Several detectors can be utilized to detect high energy γ-ray, and one of the most suitable candidates is the silicon strip detector which possesses very high position and energy resolution. Silicon strip detector can be used to accurately detect the traversing particle's track and energy, and can be easily assembled together to form a large detecting plane.[Purpose] This study aims to explore key technologies of the silicon strip detector, including high-precision assembly techniques, front-end electronics design and data acquisition board design.[Methods] First of all, a test system with a low leakage current was built to inspect the silicon strip sensor. Then, an automatic wire-bonder was employed to connect the wires of sensors and front-end electronics. The automatic bond-tester was used to test wires' firmness. Finally, a readout scheme based on the characteristics of the sensor was design, and the printed circuit board (PCB) layout of the front-end electronics was optimized. In order to design the data acquisition board, the logics in the key component field programmable gate array (FPGA) and the automatic data acquisition software in the host computer were implemented.[Results] A prototype silicon strip detector has been fabricated and tested. All 384 channels show a good linearity in the range of 0~180 fC and the non-linearity is less than 5%. The prototype's input equivalent noise is less than 0.16 fC. The cosmic ray test result shows a clear peak of the minimum ionizing particle of 2.8 fC and the spectrum matches the convoluted Landau and Gaussian fitting function.[Conclusion] The well behaved prototype demonstrates the validity and feasibility of the key technologies, and these technologies can be applied to the practical silicon strip detector for space astronomy.

Key words: Dark matter, γ-ray, Silicon strip detector

CLC Number: 

  • TL8