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对摄象管磁聚焦磁偏转系统,O.Schade曾经提出一种计算电子轨迹和分析象差的方法。作者用此法实现了与Schade相同的结果。该法用“等效磁场”的概念来近似处理网前径向电场,本文指出这一概念不适用于具有强准直透镜的现代摄象管,提出用Runge—Kutta法解复合场中电子轨迹的方法来代替。对国产偏转聚焦组件PJ—25P及两端增强的聚焦磁场作了计算,与实测结果吻合。计算表明,PJ—25P的性能良好,以及采用两端适当增强的聚焦磁场,能够提高四角分辨率。
For tube magnetic focusing magnetic deflection systems, O. Schade has proposed a method of calculating electron trajectories and analyzing aberrations. The author uses this method to achieve the same result as Schade. This method uses the concept of “equivalent magnetic field” to approximate the radial electric field in front of the net. This paper points out that this concept is not suitable for the modern imaging tube with strong collimating lens. The Runge-Kutta method is proposed to solve the electron trajectory Method instead. The domestic defocusing focusing assembly PJ-25P and the focusing magnetic field enhanced at both ends were calculated, which is in good agreement with the measured results. Calculations show that the PJ-25P performs well and uses a properly focused focus magnetic field at both ends to increase the quadrupole resolution.