Structure analysis and improvement of non-interfering beam diagnostic technology based on diamagnetic loops
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摘要: 基于反磁回路线圈提出了一种新型在线束流半径诊断结构，该结构可以实现束流的磁场信息和电场信息同时测量并分离，通过分析可以得到束流包络均方根半径和束流的流强信息。着重介绍探头的结构、拓扑电路和模拟实验平台组成，分析探头电场信息的一致性问题，提出改进措施，对改进前后的测量结果进行比较，说明了改进结构的有效性，将电场信号的一致性由原来的94.08%提高到99.60%，模拟束流杆半径测量误差在1 mm以内。Abstract: A different on-line beam radius diagnosis structure based on the principle of diamagnetic loops was proposed. This structure can distinguish beam information from magnetic field at the same time, from which we can obtain beams' radius and currents. This paper focuses on the probe structure, equivalent circuit and experiment simulation platform. It analyzes the homogeneity of electric field information and puts forward the improvement measures, then compares the measurement results before and after improvement to illustrate the effectiveness of the structure. It shows that the consistency of the electric field signals increases from 94.08% to 99.60%. The simulated screwrods' radius errors are within 1 mm.
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Key words:
- diamagnetic loops /
- beam diagnosis /
- beam radius /
- electron linear induction accelerator
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图 4 轴向磁场信号和径向电场信号方向示意图
Figure 4. Schematic diagram of axial magnetic field signal and radial electric field signal
图 7 改进前输入电压信号和探头输出电压信号
Figure 7. Voltage signals of input pulse and detection with original configuration
图 8 改进后输入电压信号和探头输出电压信号
Figure 8. Voltage signals of input pulse and detection with improved configuration
表 1 不同半径模拟束流杆实验结果
Table 1. Different types of screwrods' experiment results
label of rods radius /mm pitch of screw /mm length /mm average RMS /mm relative error /% absolute error /mm Set1 21 1900 950 20.83 0.81 0.17 Set2 21 3800 950 21.23 1.10 0.23 Set3 26 1900 950 25.90 0.38 0.10 Set4 26 5700 950 26.43 2.2 0.57 Set5 32 1900 950 32.13 0.41 0.13 Set6 32 7600 950 31.38 1.90 0.62 Set7 32 ∞ 950 
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