用改进的三梯度法表征脉冲电子源
Pulsed electron source characterization with the modified three gradient method
摘要：
本文给出了应用于脉冲强流电子源的修正三梯度法（MTGM）的计算结果。MTGM使得在空间电荷存在的情况下非破坏性地确定束流发射度成为可能[1]。我们应用MTGM的实验系统配备了一个皮尔斯收敛二极管，工作在脉冲模式，并有一个直接加热的阴极作为电子源。这一选择主要是由于这种源类型的分析表征的可用性[2]，以及皮尔斯型源在直线加速器中的扩展使用。基于轴对称配置的K-V方程[3]，使用数值匹配程序处理实验数据，以确定发射度和物体交叉位置和直径。这些参数的变化进一步研究相对于两个电气和建设性的来源：阴极加热电流，提取电压，和阴极-阳极距离的特性。
英文摘要：
Results from the Modified Three Gradient Method (MTGM), applied to a pulsed high intensity electron source, are presented. The MTGM makes possible the non-destructive determination of beam emittance in the space charge presence [1]. We apply the MTGM to an experimental system equipped with a Pierce convergent diode, working in pulse mode, and having a directly heated cathode as electron source. This choice was mainly motivated by the availability of an analytical characterization of this source type [2], as well as the extended use of the Pierce type sources in linear accelerators. The experimental data are processed with a numerical matching program, based on the K-V equation for an axially symmetric configuration [3], to determine the emittance and object cross-over position and diameter. The variation of these parameters is further investigated with respect to both electrical and constructive characteristics of the source: cathode heating current, extraction voltage, and cathode-anode distance.
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