Effects of Ion Barrier Film on Image Noise in Generation III Image Tube
In the third-generation image tube, the input surface of microchannel plate (MCP) is typically coated with an ultra-thin dielectric film, called the ion barrier film (IBF), to prevent ions generated in MCP during operation from migrating back to the photocathode and damaging the activation layer of photocathode, and prolong the operation lifetime. But IBF will serves as a scattering center for electron signal and reduce the signal-to-noise (SNR) of the image tube. In this paper, we present overviews of the IBF roles in third-generation image tubes, and the results of Monte-Carlo simulation on electron transmission through the Al2O3 dielectric film with varying electron energy and film thickness. We also calculated and analyzed the noise factors of Al2O3 IBF by Monte-Carlo simulation and the quantum noise model. A method of Temporal Domain Segmentation was proposed for statistical calculation. The results show the noise factor of IBF from quantum noise model is 1.07-1.28 at working voltage of 500-800V, and the one from Monte Carlo Simulation is 1.6-2.6.
ion barrier film image tube signal-to-noise noise factor simulation
Qingduo Duanmu Ye Li Shencheng Fu Guozheng Wang De Song Xin Wang Xulei Qin
Changchun University of Science and Technology Changchun, China
国际会议
2012 International Conference on Optoelectronics and Microelectronics(2012光电子与微电子国际学术会议 2012 ICOM)
长春
英文
549-552
2012-08-23（万方平台首次上网日期，不代表论文的发表时间）