Transmission characteristics and fringing field effect of a 270° spherical electrostatic analyzer
Transmission characteristics and fringing field effect of a 270° spherical electrostatic analyzer
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270°球形静电分析仪的传输特性和边缘场效应
DOI：
10.1063/1.1139117
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发表时间：
1986
期刊：
影响因子：
--
通讯作者：
W. Miyake
中科院分区：
文献类型：
--
作者：
T. Mukai;W. Miyake
从理论计算和标定实验两方面研究了270°球形截面静电分析器的三维传输特性。这两个结果之间获得了相当好的一致性，这证实了作为入射粒子的能量和角度的函数的良好定义的响应以及与具有强能量-角度耦合的90°分析器相比270°分析器的高分辨率能力。为了抑制边缘场效应，我们采用了一种特殊的粒子波导作为分析器的入口狭缝。当我们用一个简单的正方形狭缝代替这个粒子导向狭缝时，分析器的传输特性与计算的传输特性相差很远。导出了近似模型的二维边缘场的数值解，并进行了粒子在该场中的光线追迹计算。该模型计算方法还表明了入射孔径附近的边缘场在激光器中的强烈影响。
Three‐dimensional transmission characteristics of a 270° spherical section electrostatic analyzer are studied with respect to both theoretical calculation and calibration experiment. A fairly good agreement is obtained between both results which confirm a well‐defined response as a function of energy and angle of incident particles and a high‐resolution ability of a 270° analyzer in contrast with a 90° analyzer which has a strong energy‐angle coupling. A particular particle guide is used as the entrance slit of our analyzer in order to suppress the fringing field effect. When we replace this particle‐guide slit by a simple slit of square shape, the transmission characteristics of the analyzer become distant from the calculated one. The numerical solution of a two‐dimensional fringing field of an approximated model is derived and the ray tracing calculation of particles in this field is done. This model calculation approach also suggests the strong effect of the fringing field near the entrance aperture in...