The neutrino detector for the Jiangmen Underground Neutrino Observatory（JUNO） requires a large number of photomultiplier tubes（PMTs）, including 15000 MCP PMTs and 5000 dynode PMTs. The TTS（transit time spread） o...The neutrino detector for the Jiangmen Underground Neutrino Observatory（JUNO） requires a large number of photomultiplier tubes（PMTs）, including 15000 MCP PMTs and 5000 dynode PMTs. The TTS（transit time spread） of the PMTs is very important for vertex and track reconstruction of the neutrinos in the detector. In this paper, we study the TTS of a 20-inch dynode PMT（R12860） from Hamamatsu for different high voltage, light intensity, light spot size and different photocathode regions. The impact from Earth＇s magnetic field is also studied.The results achieved in this paper will be very useful for the JUNO experiment.展开更多
The quality of PMT signals is crucial for large-size and high-precision neutrino experiments, but most of these experiments are affected by the overshoot of PMT signals from the positive HV-single cable scheme. Oversh...The quality of PMT signals is crucial for large-size and high-precision neutrino experiments, but most of these experiments are affected by the overshoot of PMT signals from the positive HV-single cable scheme. Overshoot affects the trigger, dead time and charge measurement from a detector. For the JUNO prototype detector, we have performed a detailed study and calculation on PMT signal overshoot to control the ratio of overshoot to signal amplitude to;%, with no effect on other PMT parameters.展开更多
基金Supported by Strategic Priority Research Program of the Chinese Academy of Sciences(XDA10011100)National Natural Science Foundation of China(U1431109,11265003)
文摘The neutrino detector for the Jiangmen Underground Neutrino Observatory（JUNO） requires a large number of photomultiplier tubes（PMTs）, including 15000 MCP PMTs and 5000 dynode PMTs. The TTS（transit time spread） of the PMTs is very important for vertex and track reconstruction of the neutrinos in the detector. In this paper, we study the TTS of a 20-inch dynode PMT（R12860） from Hamamatsu for different high voltage, light intensity, light spot size and different photocathode regions. The impact from Earth＇s magnetic field is also studied.The results achieved in this paper will be very useful for the JUNO experiment.
基金Supported by Strategic Priority Research Program A-JUNO,High Energy Physics Experiment and Detector R&DNational Natural Science Foundation of China
文摘The quality of PMT signals is crucial for large-size and high-precision neutrino experiments, but most of these experiments are affected by the overshoot of PMT signals from the positive HV-single cable scheme. Overshoot affects the trigger, dead time and charge measurement from a detector. For the JUNO prototype detector, we have performed a detailed study and calculation on PMT signal overshoot to control the ratio of overshoot to signal amplitude to;%, with no effect on other PMT parameters.
