用于空间天文的硅微条探测器原型样机研制

韦家驹

doi:10.11889/j.0253-3219.2018.hjs.41.120402

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用于空间天文的硅微条探测器原型样机研制

核电子学与仪器 | 更新时间：2021-05-19

- 用于空间天文的硅微条探测器原型样机研制
- A prototype silicon strip detector for space astronomy
- 核技术 2018年41卷第12期文章编号：120402
- 作者机构：
  
  1.中国科学院紫金山天文台南京 210008
  2.中国科学院暗物质与空间天文重点实验室南京 210008
- 作者简介：
  
  [ "韦家驹, 男, 1983年出生, 2012年于东南大学获博士学位, 研究领域为半导体探测器技术", "WEI Jiaju, male, born in 1983, graduated from Southeast University with a doctoral degree in 2012, focusing on semiconductor detector technology" ]
- 基金信息：
  
  国家自然科学基金(11503095);中国科学院空间科学战略性先导科技专项(XDA15010200)
- DOI：10.11889/j.0253-3219.2018.hjs.41.120402
  中图分类号： TL8
- 收稿日期：2018-07-20，
  
  修回日期：2018-10-20，
  
  纸质出版日期：2018-12-10
- 稿件说明：
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韦家驹. 用于空间天文的硅微条探测器原型样机研制[J]. 核技术, 2018,41(12):120402

Jiaju WEI. A prototype silicon strip detector for space astronomy[J]. Nuclear techniques, 2018, 41(12): 120402
韦家驹. 用于空间天文的硅微条探测器原型样机研制[J]. 核技术, 2018,41(12):120402 DOI： 10.11889/j.0253-3219.2018.hjs.41.120402.

Jiaju WEI. A prototype silicon strip detector for space astronomy[J]. Nuclear techniques, 2018, 41(12): 120402 DOI： 10.11889/j.0253-3219.2018.hjs.41.120402.

摘要

γ射线的天文观测是目前天文观测的前沿课题，通过观测高能γ射线的能谱和空间分布，可以研究宇宙中暗物质的分布及其物理特性。在众多γ射线探测器中，硅微条探测器具有很高的位置分辨率和能量分辨率，并且可以拼接组成大探测面，非常适合探测粒子的径迹和能量。为了解决硅微条探测器的关键技术，包括探测器微组装、前端读出电子学、数据采集电路，实验室自主研制了探测器样机并进行一系列测试。该样机的384个通道在0~180 fC的输入动态范围内具有很好的线性（积分非线性小于5%），同时具有很低的噪声（等效输入噪声电荷小于0.16 fC）。样机的宇宙线能谱曲线可以清晰分辨出最小电离粒子的峰位约2.8 fC，并且可以用朗道卷积高斯函数精确拟合。

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.

关键词

Keywords

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