Study of time resolution by digital methods with a DRS4 module  

作　　者：杜成名 陈金达 张秀玲 杨海波 成科 孔洁 胡正国 孙志宇 苏弘 徐瑚珊 

机构地区：[1]Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China [2]University of Chinese Academy of Sciences, Beijing 100049, China [3]Northwest Normal University, Lanzhou 730070, China

出　　处：《Chinese Physics C》2016年第4期62-67,共6页中国物理C（英文版）

基　　金：Supported by the Science Foundation of the Chinese Academy of Sciences(210340XBO);National Natural Science Foundation of China(11305233,11205222);General Program of National Natural Science Foundation of China(11475234);Specific Fund of National Key Scientific Instrument and Equipment Development Project(2011YQ12009604);Joint Fund for Research Based on Large-Scale Scientific Facilities(U1532131)

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 La Br3 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 La Br3 scintillators and placed on opposite sides of a radioactive positron22 Na source for 511 ke V 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（d CFD） 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-？E and TOF-E systems for particle identification, with picosecond accuracy timing measurement.Furthermore, this module is more simple and convenient than other systems.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 La Br3 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 La Br3 scintillators and placed on opposite sides of a radioactive positron22 Na source for 511 ke V 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（d CFD） 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-？E and TOF-E systems for particle identification, with picosecond accuracy timing measurement.Furthermore, this module is more simple and convenient than other systems.

关 键 词：discrimination convenient analog fitting sampler timing coincidence readout placed electronics 

分 类 号：TN911.23[电子电信—通信与信息系统]