几种诊断高能注量电子束参数的方法
Several diagnostic methods for high fluence electron beam parameters
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摘要: 简要分析了反映高能注量电子束品质的主要参数在诊断上的技术困难，重点介绍了高能注量电子束参数诊断的三种参数的测量方法，包括内过滤法对电子束瞬态有效入射角的测量、法拉第筒阵列对时间分辨的电子束流密度的测量和石墨量热计对电子束总能量的测量并校正。在闪光二号加速器二极管间隙电压为1.08MV和电流为484kA条件下，距阴极20.5cm处直接测量的总束能19.1kJ，经校正后为22kJ。测量还给出了不同时刻束截面上的径向和角向束流密度分布，而束斑中心处的能注量高于平均值约13%。在磁透镜比为3.5的条件下，电压峰值（1.2MV）时刻测得的电子平均入射角73°。实验和计算都表明，影响平均入射角的因素主要是电子能量、磁透镜比及靶位。Abstract: After briefly analyzing the technical difficulties of diagnosing high fluence electron beam，three new methods for diagnosing parameters, including filtered Farady cup for measurement of the electron transient effective incident angle，Farady multi-cup for measurement of the time-resolved current density and graphite calorimeter for measuring the total beam energy with correction, are presented. In the condition of space voltage 1.08MV and current 484kA on the diode of flash-2 accelerator，in the distance 20.5cm from cathode measured is total beam energy of 19.1kJ, and of 22kJ after correction. By means of measurement is presented also radial and azimuthal current density on the beam cross-section in different time, and energy fluence on beam spot center with 13% more than its average valu
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