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本文对Vidicon型摄象管中电子束着靶时的自变尖效应及其对电子束分辨能力的影响进行了计算机数值分析。所采用的数学物理模型为电子束中电流密度在横截面上的分布为Gauss分布;电子束中电子的能量分布为Maxwell分布;电子束读出靶面信息的模型为电容放电模型。在电子束截面为一维模型时,计算了1 1/4″、1″、2/3″PbO管(plumbicon)1″Sb_2S_3管和1″硒砷碲管(saticon)中电子束自变尖的情况及其对电子束幅度响应函数(AR)的影响。分析了束电流、信号电流、束等效温度、靶面电容、扫描速度等因素在自变尖效应中所起的作用。本文还以1 1/4″PbO靶管为例,给出了电子束截面为二维模型时,电子束有效着靶截面的自变尖情况。
In this paper, the self-transformation effect of the electron beam in the Vidicon tube and its effect on the resolution of the electron beam are analyzed numerically. The mathematical model used is that the distribution of current density in the electron beam is Gauss distribution in the cross section; the energy distribution of the electron in the electron beam is Maxwell distribution; and the model of the target reading information of the electron beam is the capacitance discharge model. When the electron beam cross section is a one-dimensional model, the electron beam tip in 1 1/4 “, 1”, 2/3 “plumbicon 1” Sb_2S_3 tube and 1 “selenium arsenide tube And its effect on the amplitude response function (AR) of the electron beam.The effects of the beam current, the signal current, the equivalent temperature of the beam, the capacitance of the target surface and the scanning speed on the self-tapping effect are also analyzed. Taking a 1/4 ”PbO target tube as an example, the eigen beam is validated by the electron beam when the electron beam cross section is a two dimensional model.