Design of Charge-Sensitive Amplifiers for Electron Multipliers
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摘要: 介绍了一种自主研制的新型电荷灵敏型三级放大器,其电路设计主要采用ADA4817高速低噪声集成运算放大芯片,该三级放大器噪声低、稳定性好、电路结构简单、性价比高、检修更换方便,可以不失真地放大上升时间在ns级的信号,放大器输出信号质量优异,可配合后续的多道分析器MCA8000D读取微通道板(microchannel plate,MCP)组件或单通道电子倍增器(single-channel electron multiplier,CEM)的单光电子谱,测试结果表明:自主设计的ADA4817型放大器在一定的方波标定脉冲信号下,其基线的宽度小于2 mV,上升沿时间约为800 ns,幅值约为40 mV,性能接近或略优于A250型放大器,可以更好地配合后续的多道分析器MCA8000D进行输出波形的分析和处理,完全满足MCP或CEM探测器的脉冲性能测试需求。Abstract: A new type of charge-sensitive three-stage amplifier was developed. The circuit design mainly adopted an ADA4817 high-speed and low-noise integrated operational amplifier chip. The three-stage amplifier had low noise, good stability, a simple circuit structure, high cost performance, and ease of maintenance. It could amplify signals with rise time in nanoseconds without distortion, and the output signal quality of the amplifier was excellent. It was used with a multi-channel analyzer MCA8000D to read a single photoelectron spectrum of a microchannel plate (MCP) assembly or a single channel electron multiplier (CEM). The test results show that the custom-made amplifier fully satisfied the pulse performance test requirements of MCP or CEM detectors, and its technical indicators were close to those of imported A250 amplifiers.
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Key words:
- electron multiplier /
- pulse count /
- single electron spectrum /
- charge sensitive amplifier
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表 1 放大器参数对比结果
Table 1. Comparison results of amplifier parameters
Type Rising edge time/ns Amplitude/mV Baseline width/mV ADA4817 ~800 ~40 < 2 A250 ~500 ~100 < 2 -
[1] Oswald H W Siegmund. High-performance microchannel plate detectors for UV/visible astronomy[J]. Nuclear Inst. and Methods in Physics Research, A, 2004, 525(1): 12-16. [2] Fraseer G W, Pearson J E, Lees J E, et al. Advances in microchannel plate detectors[C]//Proceeding of SPIE, 1988, 982: 98-107. [3] HONG R, Leredde A, Bagdasarova Y, et al. High accuracy position response calibration method for a micro-channel plate ion detector[J]. Nuclear Inst. and Methods in Physics Research, A, 2016, 835: 42-50. doi: 10.1016/j.nima.2016.08.024 [4] 张洋, 黄永刚, 刘辉, 等. 阳极氧化铝微通道板研究的进展[J]. 红外技术, 2012, 34(7): 427-432. doi: 10.3969/j.issn.1001-8891.2012.07.010ZHANG Yang, HUANG Yonggang, LIU Hui, et al. Progress in anodic aluminum oxide microchannel plates[J]. Infrared Technology, 2012, 34(7): 427-432. doi: 10.3969/j.issn.1001-8891.2012.07.010 [5] 高峰, 钱森, 宁哲, 等. 光电探测器件的单光电子谱数据获取[J]. 核技术, 2019, 42(10): 55-62. https://www.cnki.com.cn/Article/CJFDTOTAL-HJSU201910009.htmGAO Feng, QIAN Sen, NING Zhen, et al. Data acquisition system for single photoelectron spectra of photoelectric detector[J]. Nuclear Techniques, 2019, 42(10): 55-62. https://www.cnki.com.cn/Article/CJFDTOTAL-HJSU201910009.htm [6] 高晋占. 微弱信号检测[M]. 北京: 清华大学出版社, 2004: 41-92.GAO Jinzhan. Weak Signal Detection[M]. Beijing: Tsinghua University Press, 2004: 41-92. [7] 王英芝. 核电子学技术原理[M]. 北京: 原子能出版社, 1989.WANG Yingzhi. Technical Principles of Nuclear Electronics[M]. Beijing: Atomic Energy Press, 1989. [8] 王经瑾, 范天民, 钱永庚. 核电子学[M]. 北京: 原子能出版社, 1985: 103-134.WANG Jingjin, FAN Tianmin, QIAN Yonggeng. Nuclear Electronics [M]. Beijing: Atomic Energy Press, 1985: 103-134. [9] ANALOG DEVICES. LTspice. DESIGN CENRER[EB/OL]. https://www.analog.com/en/design-center/design-tools-and-calculators/ltspice-simulator.html. [10] YANG Yuzhen, LIU Shulin, ZHAO Tianchi, et al. Single electron counting using a dual MCP assembly[J]. Nuclear Instruments and Methods in Physics Research A, 2016, 830: 438-443. doi: 10.1016/j.nima.2016.06.035 [11] YANG Yuzhen, YAN Baojun, LIU Shulin, et al. MCP performance improvement using alumina thin film[J]. Nuclear Instruments and Methods in Physics Research A, 2017, 868: 43-47. doi: 10.1016/j.nima.2017.06.049 [12] 杨玉真. 基于JUNO中MCP-PMT的微通道板组件研究与性能优化[D]. 南京: 南京大学, 2017.YANG Yuzhen. Research and Performance Optimization of Microchannel Board Components Based on MCP-PMT in JUNO[D]. Nanjing: Nanjing University, 2017: 52-54. [13] AMPTEK. Charge Sensitive Preamplifiers(A250 & A275). [EB/OL]. https://www.amptek.com/internal-products/a250-charge-sensitive-pre-amplifier.