Reconfigurable positron annihilation lifetime spectrometer utilizing a multi-channel digitizer
Reconfigurable positron annihilation lifetime spectrometer utilizing a multi-channel digitizer
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DOI：
10.1016/j.nima.2019.162691
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发表时间：
2019-12
影响因子：
1.4
通讯作者：
L. H. Cong;B. Gu;X. X. Han-X.;Q. Zhao;Z. Pan;R. Ye;Jun Guo;B. Ye
中科院分区：
文献类型：
--
作者：
L. H. Cong;B. Gu;X. X. Han-X.;Q. Zhao;Z. Pan;R. Ye;Jun Guo;B. Ye
正电子湮灭寿命（PAL）光谱是研究材料原子尺度微观结构的有力工具。但PAL光谱很容易失真，从而得出错误的结论。传统的PAL光谱仪已广泛使用，但数据处理能力有限。为了解决普遍存在的光谱失真问题，并找到一种经济的方式让传统PAL光谱仪具有更好的性能，我们设计了一种基于传统电子系统、多通道数字化卡和LaBr 3 闪烁体的可重构PAL光谱仪。通过使用多种数据处理方法，PAL光谱的分析结果显示出显着的改善。我们讨论了导致 PAL 光谱失真的原因，并尝试找出我们的方法如何带来改变。完成了PAL光谱模拟、Geant4能量沉积模拟等相关工作。还开发了其他几个功能（例如时间行走偏移）来提高整个系统的性能。如果需要，光谱仪仍然能够添加更多功能。
Positron annihilation lifetime (PAL) spectroscopy is a powerful tool to study atomic-scaled microstructure of materials. But PAL spectra can be easily distorted, then one will get wrong conclusions. Conventional PAL spectrometers have been widely used but the data processing capability is limited. In order to deal with the generally existed problems related to spectra distortion, and find an economic way to let conventional PAL spectrometers have better performance, we design a reconfigurable PAL spectrometer based on conventional electronic system, multi-channel digitizer card, and LaBr 3 scintillator. By using several data processing methods, analysis results of PAL spectra show significant improvements. We discuss the reasons that cause PAL spectra distortion, and try to figure out how our methods can bring changes. Related works including PAL spectra simulation and Geant4 energy deposition simulation have been done. Several other functions such as time walk offset have been developed to improve the performance of whole system. The spectrometer is still capable to add more functions if needed.