微通道板(MCP)是一种具有二次电子增益机能的、十几微米的玻璃导管制成二维方式,厚度不到1毫米的电子倍增器。如图1所示,在向通道的两端提供一定电压的状态下,一次电子轰击入射端,而后放出二次电子。二次电子在沿着磁场向输出端转移的过程中,通过与通道面壁的多次反复的撞击,最后能得到10~4以上的增益。 The microchannel plate (MCP) is a two-dimensional, less than 1-mm-thick electron multiplier that has a secondary electron gain function of more than a dozen micrometers of glass tubing. As shown in Fig. 1, in the state that a certain voltage is applied to both ends of the channel, an electron bombards the incident end and then emits secondary electrons. During the transfer of the secondary electrons along the magnetic field to the output end, more than 10 ~ 4 gain can be finally obtained through repeated impacts with the surface of the passageway.