Small PMT Divider Optimization And Waveform Spectrum Analysis

With the discovery of neutrinos,the research boom of neutrinos has gradually emerged.Since Reins and Cowan discovered neutrinos in 1956,scientists have gradually achieved remarkable results in the field of neutrinos,and are gradually uncovering the mystery of such particles.The study of neutrinos is one of the most active branches in particle physics.There are many mysteries,which may be a breakthrough for new physics beyond the standard model.Therefore,scientists all over the world are working hard to study neutrinos.With.There are many experiments in the world that have been built or are under construction.China has also made diligent explorations in the field of neutrino research.The Daya Bay Neutrino Experiment Project is a scientific experiment project to explore the mysteries of neutrinos in China.This experiment is to accurately measure the most basic unknown parameter in nature-the neutrino mixing angle θ₁3,which has been carried out internationally.Multiple reactor neutrino experiments,but the Daya Bay neutrino experiment project in China has improved the accuracy of neutrino experiments by an order of magnitude.At the same time as the Daya Bay experiment,China conducted a second neutrino experiment,the Jiangmen neutrino experiment.The purpose of the Jiangmen neutrino experiment was to determine the quality of electron neutrinos,neutrinos and neutrinos.Sequence,accurately measure 3 of the 6 neutrino oscillation parameters and achieve an international best level better than 1%.The Jiangmen neutrino experiment is located in Kaiping City,Jiangmen,Guangdong.It is close to two nuclear power plants,Yangjiang Nuclear Power Plant and Taishan Nuclear Power Plant.The neutrino from the reactor has the most obvious oscillation effect,and the mountain can also shield certain The effects of cosmic rays.The Jiangmen neutrino experiment was started in 2014 and is expected to be completed in 2021.The experiment will use 18,000 20-inch photomultiplier tubes and 36,000 3-inch photomultiplier tubes,which will constitute the core detector of the experiment.Capture the product of the neutrino reaction.The photomultiplier tube needs to be connected by using a voltage divider and electronics.This paper mainly discusses the voltage divider design and optimization of the photomultiplier tube,and gradually improves the reliability and stability of the voltage divider.The designed voltage divider should be tested to test whether there is spark sparking and how to find ways to reduce the flasher luminescence.Through this design-test-optimization-retest method,the stability of the voltage divider is gradually improved.Make it finally meet the experimental requirements.At the same time,this paper will discuss in detail the influence of the voltage divider ratio on the dispersion time dispersion of Hainan Zhanchuang 3-inch photomultiplier tube,and finally determine the partial pressure ratio used in the experiment,because the photomultiplier tube will appear aging during use.In the case,the various performance parameters will be gradually reduced.This paper also discusses the aging test of the 20-inch photomultiplier tube of North Night Vision and Japan Hamamatsu,and discusses how the performance changes with the aging test.Test whether some or all of the performance parameters before testing can be restored by some methods.At the same time,two description methods of the gain of the photomultiplier tube of Hamamatsu,Japan will be introduced.The deviation of the gain description method under different light intensities will be compared and the method used will be determined.