Study of time resolution by digital methods with a DRS4 module

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Cheng-Ming Du, Jin-Da Chen, Xiu-Ling Zhang, Hai-Bo Yang, Ke Cheng, Jie Kong, Zheng-Guo Hu, Zhi-Yu Sun, Hong Su and Hu-Shan Xu. Study of time resolution by digital methods with a DRS4 module[J]. Chinese Physics C, 2016, 40(4): 046101. doi: 10.1088/1674-1137/40/4/046101
Cheng-Ming Du, Jin-Da Chen, Xiu-Ling Zhang, Hai-Bo Yang, Ke Cheng, Jie Kong, Zheng-Guo Hu, Zhi-Yu Sun, Hong Su and Hu-Shan Xu. Study of time resolution by digital methods with a DRS4 module[J]. Chinese Physics C, 2016, 40(4): 046101.  doi: 10.1088/1674-1137/40/4/046101 shu
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Received: 2015-06-25
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    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) and Joint Fund for Research Based on Large-Scale Scientific Facilities(U1532131)

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Study of time resolution by digital methods with a DRS4 module

    Corresponding author: Jin-Da Chen,
  • 1. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
  • 2. University of Chinese Academy of Sciences, Beijing 100049, China
  • 3.  Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
  • 4. Northwest Normal University, Lanzhou 730070, China
Fund Project:  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) and Joint Fund for Research Based on Large-Scale Scientific Facilities(U1532131)

Abstract: 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 electronics and acquisition system to process the output signals from XP20D0 photomultiplier tubes(PMTs). Two PMTs were coupled with LaBr3 scintillators and placed on opposite sides of a radioactive positron 22Na 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.

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