Purpose Xi'an Institute of Optics and Precision Mechanics of CAS is developing a novel MCP-PMT with 2×2 matrix anode pixels with a time resolution of picosecond level.It is composed of a cermet shell,bi-alkal...Purpose Xi'an Institute of Optics and Precision Mechanics of CAS is developing a novel MCP-PMT with 2×2 matrix anode pixels with a time resolution of picosecond level.It is composed of a cermet shell,bi-alkali photocathode,and V-type cascade MCP layers.In order to study the method of measuring the characteristics of such MCP-PMT with picosecond time resolution,we develop a PMT test system to test its performance.Methods A voltage divider resistor circuit for the MCP-PMT is designed to meet the requirements of both high gain and fast time response.The test system includes a picosecond laser source in the single-photon mode,a high-bandwidth oscilloscope,and another fast MCP-PMT as reference.Full waveforms of PMT signals are collected and analyzed offline.The overall system time error is 26 ps.Results The test result shows that the gain of the MCP-PMT achieves 1 x 107.The transit time spread(TTS)of all channels is better than 60 ps(σ).The uniformity and crosstalk among adjacent channels are also studied by scanning each channel's response along the photocathode plane.Conclusions The MCP-PMT shows excellent timing performance and the potential of achieving better spatial resolution by further pixelation.展开更多
In this study,we present the large photomultiplier tube(PMT)afterpulse measurement results obtained from the Jiangmen underground neutrino observatory(JUNO)experiment.A total of 11 dynode-PMTs(R12860)from the Hamamats...In this study,we present the large photomultiplier tube(PMT)afterpulse measurement results obtained from the Jiangmen underground neutrino observatory(JUNO)experiment.A total of 11 dynode-PMTs(R12860)from the Hamamatsu company(Hamamatsu Photonics K.K.(HPK))and 150 micro-channel plate PMTs(MCP-PMTs,GDB-6201)from the NNVT company(North Night Vision Technology Co.,Ltd.(NNVT))were tested.Subsequently,an afterpulse model was built according to the afterpulse time distribution and the probability of occurrence for these two types of PMTs.The average ratio of the total afterpulse charge with a delay between 0.5μs and 20μs to the primary pulse charge is∼5.7%(13.2%)for the tested MCPPMTs(dynode-PMTs).The JUNO experiment will deploy 20,01220-inch PMTs;this study will benefit detector simulation,event reconstruction,and data analysis regarding the JUNO experiment.展开更多
通过基于电子学取数的测试系统,在地磁场环境对两种不同聚焦级结构的微通道板型光电倍增管(microchannel plate type photomultiplier tubes,MCP-PMT)进行了各项性能测试,例如单光电子谱、后脉冲、渡越时间涨落、信号上升下降时间、收...通过基于电子学取数的测试系统,在地磁场环境对两种不同聚焦级结构的微通道板型光电倍增管(microchannel plate type photomultiplier tubes,MCP-PMT)进行了各项性能测试,例如单光电子谱、后脉冲、渡越时间涨落、信号上升下降时间、收集效率等。并通过改变光电倍增管与地磁场的相对位置,测得不同角度下MCP-PMT的性能,并且经对比屏蔽磁场条件下与地磁场环境下MCP-PMT的性能,定性分析了地磁场对MCP-PMT的性能影响。展开更多
The Institute of High Energy Physics, Chinese Academy of Sciences have designed a new type of photomultiplier tube(PMT) based on microchannel plates(MCPs) with large area photocathode, known as large area microchannel...The Institute of High Energy Physics, Chinese Academy of Sciences have designed a new type of photomultiplier tube(PMT) based on microchannel plates(MCPs) with large area photocathode, known as large area microchannel plate photomultiplier tube(MCP–PMT). The aging characteristics of the large area MCP–PMTs are different from dynode PMTs and small proximity-focus MCP–PMT. In this work, a prototype large area MCP–PMT was aged by operating with nearly 1000 photoelectrons per pulse for 3 months, and aging process of the MCP–PMT was discussed based on the aging curve.展开更多
基金supported by the National Natural Sci-ence Foundation of China,Nos.11775217 and 11675172
文摘Purpose Xi'an Institute of Optics and Precision Mechanics of CAS is developing a novel MCP-PMT with 2×2 matrix anode pixels with a time resolution of picosecond level.It is composed of a cermet shell,bi-alkali photocathode,and V-type cascade MCP layers.In order to study the method of measuring the characteristics of such MCP-PMT with picosecond time resolution,we develop a PMT test system to test its performance.Methods A voltage divider resistor circuit for the MCP-PMT is designed to meet the requirements of both high gain and fast time response.The test system includes a picosecond laser source in the single-photon mode,a high-bandwidth oscilloscope,and another fast MCP-PMT as reference.Full waveforms of PMT signals are collected and analyzed offline.The overall system time error is 26 ps.Results The test result shows that the gain of the MCP-PMT achieves 1 x 107.The transit time spread(TTS)of all channels is better than 60 ps(σ).The uniformity and crosstalk among adjacent channels are also studied by scanning each channel's response along the photocathode plane.Conclusions The MCP-PMT shows excellent timing performance and the potential of achieving better spatial resolution by further pixelation.
基金supported by Strategic Priority Research Program of the Chinese Academy of Sciences (No. XDA10011100),Joint Institute of Nuclear Research (JINR),Russia and Lomonosov Moscow State University in Russia,joint Russian Science Foundation (RSF),DFG (Deutsche Forschungsgemeinschaft)National Natural Science Foundation of China (Nos. 12090062 and 12075087)
文摘In this study,we present the large photomultiplier tube(PMT)afterpulse measurement results obtained from the Jiangmen underground neutrino observatory(JUNO)experiment.A total of 11 dynode-PMTs(R12860)from the Hamamatsu company(Hamamatsu Photonics K.K.(HPK))and 150 micro-channel plate PMTs(MCP-PMTs,GDB-6201)from the NNVT company(North Night Vision Technology Co.,Ltd.(NNVT))were tested.Subsequently,an afterpulse model was built according to the afterpulse time distribution and the probability of occurrence for these two types of PMTs.The average ratio of the total afterpulse charge with a delay between 0.5μs and 20μs to the primary pulse charge is∼5.7%(13.2%)for the tested MCPPMTs(dynode-PMTs).The JUNO experiment will deploy 20,01220-inch PMTs;this study will benefit detector simulation,event reconstruction,and data analysis regarding the JUNO experiment.
文摘通过基于电子学取数的测试系统,在地磁场环境对两种不同聚焦级结构的微通道板型光电倍增管(microchannel plate type photomultiplier tubes,MCP-PMT)进行了各项性能测试,例如单光电子谱、后脉冲、渡越时间涨落、信号上升下降时间、收集效率等。并通过改变光电倍增管与地磁场的相对位置,测得不同角度下MCP-PMT的性能,并且经对比屏蔽磁场条件下与地磁场环境下MCP-PMT的性能,定性分析了地磁场对MCP-PMT的性能影响。
基金supported by the National Natural Science Foundation of China(Grant Nos.11175198 and 11475209)the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant Nos.XDA10010200 and XDA10010400)
文摘The Institute of High Energy Physics, Chinese Academy of Sciences have designed a new type of photomultiplier tube(PMT) based on microchannel plates(MCPs) with large area photocathode, known as large area microchannel plate photomultiplier tube(MCP–PMT). The aging characteristics of the large area MCP–PMTs are different from dynode PMTs and small proximity-focus MCP–PMT. In this work, a prototype large area MCP–PMT was aged by operating with nearly 1000 photoelectrons per pulse for 3 months, and aging process of the MCP–PMT was discussed based on the aging curve.
