Physical design of calibrated device for intense pulse electron beam position monitor
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摘要: 从强流脉冲电子直线感应加速器电子束流位置探测器测量原理出发，进行了标定装置物理设计，确定标定装置采用同轴结构，对束流探测器位置测量精度和测量范围、偏心同轴线对位置标定结果的影响进行了理论分析，并根据分析结果确定同轴结构内外导体相对位置调节范围、同轴线长度和特性阻抗。电路模拟和实验测量结果验证了在非匹配传输条件下可以得到满足位置标定要求的快脉冲信号波形。Abstract: Accurate measurement of the intense pulse electron beam transverse position is not only related to the technology of beam position monitor (BPM) design, machining and assembly, but also related to calibration of BPM. This paper describes the physical design of the calibrated device based on the measuring principle of intense pulse electron beam position monitor in linear induction accelerator. A coaxial line structure is used as the calibrated device. The axial length that affects the electromagnetic field at a given location and the position measurement affected by coaxial line with displaced inner conductor are analyzed in theory, the results determine the length and the characteristic impedance of the coaxial line. The extent of inner conductor displacement is determined by the calculated errors of beam position measurement. Pulse signal mismatch transmission in calibration, the PSpice simulation and experimental measurement are performed, and results show that a required pulse waveform is obtained.
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Key words:
- linear induction accelerator /
- pulsed electron beam /
- position monitor /
- calibration /
- calibrated device /
- design
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图 2 无限长电流在范围Z内的磁场示意图
Figure 2. Sketch of axial magnetic field generated by infinite length line current
图 4 同轴线电中心与几何中心比值随特性阻抗变化
Figure 4. Ratio of electric center to geometric center vs characteristic impedance of coaxial line
图 5 理想束流探测器位置测量结果与束流位置设置结果比较
Figure 5. Compareison between measurement of ideal BPM and set position
图 7 不同标定装置特性阻抗时的脉冲波形
Figure 7. Pulse waveform in different characteristic impedance of calibrated device
图 10 脉冲信号源输出电压、电流波形
Figure 10. Output voltage and current waveform of pulse signal source
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