Measurement of current distribution based on Faraday cup array
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摘要: 研制了一种用于测量强流脉冲电子束束流均匀性的微型法拉第筒阵列，其直径为22 mm，由5个微型法拉第筒组成，最大可测束流密度为38 A/mm2。利用该系统测量了二极管阳极靶面的束流密度，得到了阳极靶面束流均匀性的分布情况。结果显示，阳极靶面中心处束流密度高于靶面其他位置，靶面束流存在弱箍缩，束流局部均匀，大面积不均匀，束流密度呈径向分布。该结果与理论预期和仿真计算符合较好。Abstract: A kind of small Faraday cup array used for measuring the intense current distribution was designed. The diameter of the Faraday cup array is 22 mm, and it consists of 5 small Faraday cups. The maximum current density which the array can measure is 38 A/mm2.The precise current density distribution on the anode target was obtained by the array. The result shows that the density on the middle of the target was higher than that on any other part of the target. A weak pinch existed during the diode working time. The uniformity of the electron beam on the target was partial. The current density distribution on the target was radially symmetrical. The experiment result is consistent with theoretical expectation and simulation result.
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Key words:
- small Faraday cup /
- array /
- current density distribution /
- uniformity
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