# Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2018, Vol. 29 ›› Issue (4): 59

• NUCLEAR ELECTRONICS AND INSTRUMENTATION •

### Readout electronics of a prototype time-of-flight ion composition analyzer for space plasma

Xing Fan 1,2 • Xian-Peng Zhang 3 • Geng Tian 3 • Chao-Wen Yang 1,2

1. 1 Department of Nuclear Engineering and Technology, College of Physics Science and Technology, Sichuan University, Chengdu 610064, China
2 Key Laboratory of Radiation Physics and Technology, Ministry of Education, Sichuan University, Chengdu 610064, China
3 Northwest Institute of Nuclear Technology, Xi’an 710024, China
• Contact: Chao-Wen Yang E-mail:ycw@scu.edu.cn
• Supported by:

This work was supported by the National Natural Science Foundation of China (Nos. 11205108, 11475121, and 11575145) and the Excellent Youth Fund of Sichuan University (No. 2016SCU04A13).

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Xing Fan, Xian-Peng Zhang, Geng Tian, Chao-Wen Yang . Readout electronics of a prototype time-of-flight ion composition analyzer for space plasma.Nuclear Science and Techniques, 2018, 29(4): 59
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Abstract:

In this study, a novel phoswich detector for beta–gamma coincidence detection is designed. Unlike the triple crystal phoswich detector designed by researchers at the University of Missouri, Columbia, this phoswich detector is of the semi-well type, so it has a higher detection efficiency. The detector consists of BC-400 and NaI:Tl with decay time constants of 2.4 and 230 ns, respectively. The BC-400 scintillator detects beta particles, and the NaI:Tl cell is used for gamma detection. Geant4 simulations of this phoswich detector find that a 2-mm-thick BC- 400 scintillator can absorb nearly all of the beta particles whose energies are below 700 keV. Further, for a 2.00-cmthick NaI:Tl crystal, the gamma source peak efficiency for photons ranges from a maximum of nearly 90% at 30 keV to 10% at 1 MeV. The self-absorption effect is also discussed in this paper in order to determine the carrier gas’s influence.