A trial construction of the secondary electron multiplier of a radial type

研制了环形倍增极二次电子倍增器。在这个倍增器中，电子呈放射状倍增。取得了如下研究成果：1.具有分离的环形倍增极的电子倍增器的输出电子电流在70微安处不显示饱和。这一事实是由于空间电荷效应的减少.由于相同的原因，具有连续倍增电极的情况下在2微安下不显示饱和。这种结构的乘法器的增益与传统的商用乘法器的增益相当.测量了倍增器在磁场沿着轴向作用下的特性。由于磁场增加了电子的跃迁长度，在200高斯处增益增加，为以后的同轴圆柱电极减速场能量分析器提供了有用的倍增器。

The secondary electron multiplier with ringshaped dynodes has been constructed constructed. In this multiplier, electrons were multiplied radially. Following results have been obtained.1. The output electron current of the electron mutliplier with separated ringshaped dynodes shows no saturation at 70 micro-ampere. This fact is due to the reductinnof the space charge effect.2. That with continuous dynodes shows no saturation at 2 micro-ampere by the same reason. The gain of this constructed multiplier is about equal to that of the conventional commercialized ones.3. Characteristics of the multiplier by the magnetic field along the axis have been measured. Since the transition length of electrons increases by the magnetic field, the gain increases at 200 gauss.For the future, the useful multiplier for the retarding field energy analyzer with coaxial cylindrical electrodes will be beveloped.