arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1506.01802physics.ins-det
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基于DRS4模块的数字定时方法分析

Analysis of digital timing methods with DRS4 module

Cheng-Ming Du, Jin-Da Chen, Xiu-Ling Zhang, Hai-Bo Yang, Ke Cheng, Jie Kong, Zheng-Guo Hu, Zhi-Yu Sun, Hong Su, Hu-Shan Xu

摘要:

基于多米诺环形采样器第四版芯片(DRS 4),研制了一种新的数字脉冲处理(DPP)模块,该模块对LaBr 3探测器具有良好的时间分辨率,并报道了处理原始探测器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XP 20 D 0光电倍增管(PMT)的输出信号。将两个光电倍增管与溴化镧闪烁体耦合,面对面放置在放射性正电子22 Na源的两侧,进行511 keV γ射线测试。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。结果表明,这是一种很有前途的方法,以更好地定位正电子湮没在正电子发射断层成像(PET)与飞行时间(TOF),以及闪烁定时测量,如在TOF-DeltaE和TOF-E系统的粒子识别,皮秒精度的定时测量。此外,该模块比其他系统更简单和方便。

英文摘要:

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 LaBr3 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 electronic and acquisition system to process the output signals from XP20D0 Photomultiplier Tubes (PMTs). Two PMTs were coupled with LaBr3 scintillator and placed face to face on both sides of a radioactive positron 22Na source for 511 keV gama 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-DeltaE and TOF-E systems for particle identification, with picosecond accuracy timing measurement. Furthermore, this module is more simple and convenient than other systems.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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