Study on measurement technique for electron beam divergence and its distribution based on Cherenkov Radiation
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摘要: 针对切伦科夫辐射特点，采用厚度尽量小的石英薄片作为转换靶，并将电子束以切伦科夫辐射角入射转换靶的形式构成一种电子束发散角分布的测量布局，并基于焦平面成像原理，研制了相应的电子束发散角光学测量系统。在强流脉冲直线感应加速器上完成了装置研制和测试工作，显示了电子束发散角分布测量系统可以获得电子束一定方向上的散角分布概况，测量结果具有一定的可信度，具有装置结构简单、数据处理难度低及速度快等特点。Abstract: The simulated results have shown that the direction of Cherenkov Radiation (CR) light in very thin layer can be used to measure electron beam divergence and its distribution directly. The measurement results are reliable if the parameters of devices used in the system are suited for the electron beam. This method is easy in data processing because it has no need to assume electron beam phasic space, beam divergence distribution, charge density distribution model and so on. The electron beam divergence distribution measurement system can be established by way of taking a thin enough quartz slice as the convertor and letting the electron beam incidence enter the convertor with Cherenkov radiation angle. Focus plane imaging method is required to obtain the divergence image of space distribution of electron at the same time. The beam divergence measurement technology and equipment development achieved on high current pulsed linear induction accelerator have proved that the system has the characteristics of simple structure, low difficulty and fast speed of data processing.
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图 1 单电子入射到透明介质的切伦科夫辐射能量分布示意
Figure 1. Cherenkov radiation when a single electron enters a transparent medium
图 2 基于焦平面成像的散角测量原理示意
Figure 2. Beam divergence measurement principle based on focus plane imaging method
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