Design of High-gain Separated Dynode Electron Multipliers
By using CST simulation software,a simulation model of high-performance dual-gain-mode-sepa-rated dynode electron multiplier is established.The effects of structural parameters and voltage distribution on its gain are analyzed.Based on this analysis,parameters are optimized and a 26-stage dynode electron multiplier is designed.The design features dual-mode switching between simulation and counting to meet the distortion-free detection requirements of incident ions with different fluxes.Simultaneously,it reduces the ineffective working time of the dynode secondary electron emission film,and extends the lifetime of the electron multiplier.Under a negative high voltage of 1 500 V and a positive high voltage of 1 000 V,the simulation output gain of the separa-ted dynode electron multiplier is 2.02 × 106,and the counting output gain can reach 4 × 107.
Electron multiplierCST simulationStructural optimizationHigh gain
万方数据
维普
