In this paper,a digitalizing board for readout of PMT signals in the prototype array of WCDA(water Cerenkov detector array)for LHAASO(Large high altitude air shower observatory)is designed.The prototype array is compo...In this paper,a digitalizing board for readout of PMT signals in the prototype array of WCDA(water Cerenkov detector array)for LHAASO(Large high altitude air shower observatory)is designed.The prototype array is composed of 9 PMTs,including the pulse time and charge measurement from the PMTs,and clock generation and trigger decision.In the digitalizing board,FPGA reconfiguration and data readout via VME bus are implemented.Test results show that the performances meet well with the requirements of readout electronics.It has been installed in Yangbajing and tests with the prototype array and DAQ is ongoing.展开更多
A digital three-detector positron lifetime spectrometer was developed.It consists of a DRS4 waveform digitizing board and three La Br3scintillation detectors coupled to XP2020Q photomultiplier tubes.DRS4 waveform digi...A digital three-detector positron lifetime spectrometer was developed.It consists of a DRS4 waveform digitizing board and three La Br3scintillation detectors coupled to XP2020Q photomultiplier tubes.DRS4 waveform digitizing allows data sampling at up to 5 GSPS with high amplitude resolution,with good time scale linearity and stability.In the triple-coincidence,the new system could reach a 195 ps time resolution,which is better than the conventional analog apparatus with the same detectors.This spectrometer can be applied to the other scintillation timing measurements with picoseconds accuracy.展开更多
基金Supported by Knowledge Innovation Program of the Chinese Academy of Sciences(Grant No.KJCX2-YW-N31)
文摘In this paper,a digitalizing board for readout of PMT signals in the prototype array of WCDA(water Cerenkov detector array)for LHAASO(Large high altitude air shower observatory)is designed.The prototype array is composed of 9 PMTs,including the pulse time and charge measurement from the PMTs,and clock generation and trigger decision.In the digitalizing board,FPGA reconfiguration and data readout via VME bus are implemented.Test results show that the performances meet well with the requirements of readout electronics.It has been installed in Yangbajing and tests with the prototype array and DAQ is ongoing.
基金Supported by the National Natural Science Foundation of China(Nos.11175171,10835006,11105139 and 10975133)
文摘A digital three-detector positron lifetime spectrometer was developed.It consists of a DRS4 waveform digitizing board and three La Br3scintillation detectors coupled to XP2020Q photomultiplier tubes.DRS4 waveform digitizing allows data sampling at up to 5 GSPS with high amplitude resolution,with good time scale linearity and stability.In the triple-coincidence,the new system could reach a 195 ps time resolution,which is better than the conventional analog apparatus with the same detectors.This spectrometer can be applied to the other scintillation timing measurements with picoseconds accuracy.
