Simulation and test of beam angle monitor for pulsed high current
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摘要: 基于束流横向偏角与束流产生轴向磁场成正比的原理,设计了环状PCB结构的轴向B-dot探头,用于直接测量束流偏角。设计并搭建了标定平台对探头进行了测试,同时利用CST MWS程序对探头进行了建模计算。计算结果与实验结果一致,表明了轴向B-dot探头可直接应用于束流偏角测量。分析了影响探头频率适用范围的原因,并根据模拟计算结果给出了改进措施。该探测器在标定平台输入上升时间130 ns,半高宽160 ns的高压信号时,探头对偏角信号的响应灵敏度为314 mV/(kAmrad)。Abstract: Beam monitors sensitive to the beams azimuthal B-dot field (sometimes referred as B-dots) are widely used to measure the displacement of beam centroid, as the beam generates a dipole term of the azimuthal magnetic field. Basing on the principle of the proportionality between the deflection angle and the difference of axial B field between the axially symmetrical positions, the axial B-dot probe has a potential use for beam deflection angle measurement. A calibration stand was built to test and improve the beam angle monitor, which was fabricated as a PCB structure. Meanwhile, simulations using the CST MWS codes were performed, demonstrating a good agreement with test results and giving some advices to suppress the disturbance of position deviation of the beam. Both the simulations and the experiments show that the axial B-dot monitor can be successfully used to measure the beam tilt directly.
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Key words:
- axial B-dot /
- beam deflection angle measurement /
- simulation /
- calibration stand
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