The Study Of Two-Stack MCP Component Performance

The Jiangmen Underground Neutrino Observatory(JUNO) will build large center detector, which need many large-area microchannel plates based photomultiplier tubes (MCP-PMT). In this thesis, based on the development of large area MCP-PMT and the construction of MCP-PMT experiment and test platform, we carry out the study of the performance of two-stack MCP component with fixed gap distance, and look for the best work state. This contributes to the development and batch production of large area MCP-PMT.The thesis introduces four configurations of two-stack MCP component firstly, then explains why choose the type of MCP component with gap voltage as electron multiplier of MCP-PMT, and why it is significant to optimize the gap voltage for improving the performance of MCP component. Brief theoretical analysis of the electrons motion law between the gap is studied. The relationship between gap voltage and the channel number on the input panel of the second MCP, covered by the electron clouds output from the one channel of first MCP, is investigated. And this will make influence on output gain of MCP component.Controlled by Lab VIEW software, based on VME data acquisition system, using QDC plug-in module V965, single photoelectron spectrum (SPE) is tested, and the gain is calculated. This system is used to measure the SPE of R5912and XP2020to get the exponential relationship between gain and voltage. So the result of PMT SPE and gain measurement using this method is reliable. This research tests the output pulse charge distribution of MCP component with gap voltage, which the gap distance is280microns and the pore diameter is10microns. Respectively changing voltage on the two MCPs and the gap, then compare the test results systematically. The results show that the second stack of MCP has been working in the saturated state, with the increasing of the first stack of MCP voltage the gain is high, and with the increase of gap voltage, the gain is low. The conclusion is coincide with the theory analysis and electron optical simulation results abtained by Xi’an Institute of Optics and Precision Mechanics of CAS in some degree.