Study of time resolution by digital methods with a DRS4 module
Study of time resolution by digital methods with a DRS4 module
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使用 DRS4 模块通过数字方法研究时间分辨率
DOI：
10.1088/1674-1137/40/4/046101
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发表时间：
2016
影响因子：
3.6
通讯作者：
Xu Hu-Shan
中科院分区：
文献类型：
--
作者：
Du Cheng-Ming;Chen Jin-Da;Zhang Xiu-Ling;Yang Hai-Bo;Cheng Ke;Kong Jie;Hu Zheng-Guo;Sun Zhi-Yu;Su Hong;Xu Hu-Shan
本文介绍了一种新的数字脉冲处理（DPP）模块，该模块基于多米诺环形采样器第四版芯片（DRS 4），对LaBr 3探测器具有良好的时间分辨率，并报道了处理探测器原始信号的不同数字时序分析方法。该模块由一个8通道的DRS 4芯片组成，作为读出电子学和采集系统，用于处理来自XP 20 D 0光电倍增管（PMT）的输出信号。将两台光电倍增管与LaBr 3超导体耦合，置于放射性正电子22 Na源的两侧，进行511 keV γ射线试验。通过对该模块采集的原始数据进行分析，采用数字恒分数鉴别（dCFD）方法获得的最佳符合定时分辨率约为194.7 ps（FWHM），优于其他数字方法和基于常规模拟系统的分析方法。研究结果表明，在正电子发射断层扫描（PET）和飞行时间（TOF）测量中，利用皮秒精度的时间测量，可以更好地定位正电子湮没，也可以用于闪烁计时测量，如TOF-ΔE和TOF-E系统中的粒子识别。此外，该模块比其他系统更简单和方便。
A new Digital Pulse Processing (DPP) module has been developed, based on a domino ring sampler version 4 chip (DRS4), with good time resolution for LaBr 3 detectors, and different digital timing analysis methods for processing the raw detector signals are reported. The module, composed of an eight channel DRS4 chip, was used as the readout electronics and acquisition system to process the output signals from XP20D0 photomultiplier tubes (PMTs). Two PMTs were coupled with LaBr 3 scintillators and placed on opposite sides of a radioactive positron 22 Na source for 511 keV γ-ray tests. By analyzing the raw data acquired by the module, the best coincidence timing resolution is about 194.7 ps (FWHM), obtained by the digital constant fraction discrimination (dCFD) method, which is better than other digital methods and analysis methods based on conventional analog systems which have been tested. The results indicate that it is a promising approach to better localize the positron annihilation in positron emission tomography (PET) with time of flight (TOF), as well as for scintillation timing measurement, such as in TOF-ΔE and TOF-E systems for particle identification, with picosecond accuracy timing measurement. Furthermore, this module is more simple and convenient than other systems.