Mcp Anti-ion Feedback Membrane Tube Resolution Characteristics Of The Iii Generation Of Shimmer

The ion barrier film at the input of the microchannel plate (MCP), which is essentially a thin continuous amorphous Al₂O₃ film, and its effect on the resolution of the third generation image tube are investigated in the present dissertation with the aim of improving the lifetime and resolution characteristics of the third generation image tube.The technique having the function of quenching cold and ion sputter is one of the practical schemes for depositing the ion barrier film whose organic substrate deposited on the input surface of the MCP which is out of touch with water improves the quality of ion barrier film, and whose ultraviolet radiation decreases the carbon contamination on the active surface of filmed MCP. This dissertation measures experimentally and analyzes theoretically the characteristics of the ion barrier film and filmed MCP, points out that ion barrier film transmits electrons and stops ion feedback,the modulation transfer function(MTF)of the ion barrier film is about one ,the volume resistance increases,the electron gain, dark current and detection efficiency decreases for MCP with film. The technological condition for depositing ion barrier film using the technique having the function of quenching cold and ion sputter is crucial, deviation from which makes it impossible to form a continuous film on the input surface of the MCP, and causes the serious carbon contamination on the active surface of MCP.In order to investigate the effect of ion barrier film at the input of MCP upon the resolution of third generation image tube,this dissertation derives the theoretical expressions of the MTF, calculates the limit resolution and builds a new threshold detecting theory model of third generation image tube. Theoretical analysis and experimental results show...