多条形电极束流能散度探测器的张角优化
Optimization of electrode opening angle for beam energy spread monitor
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摘要: 采用Surperfish对北京正负电子对撞机的多条形电极束流能散度探测器进行了电磁场模拟计算。在带模拟束流的情况下，计算分析了探测器对束流位置和能散度的分辨能力与电极张角之间的关系，首次计算了条形电极间的电容耦合综合强度。电极张角优化结果表明：在不考虑噪声水平的情况下，电极张角为20°时，探测器的灵敏度和分辨率达到最优。而当噪声影响很大时，可以适当增加电极张角，同时考虑减小噪声的措施。Abstract: The electromagnetic field of beam energy spread monitor (BESM) with multi-stripline electrodes for BEPCII is calculated by Superfish code. The electromagnetic field computations with simulation beam are used to analyze the relations between the electrode opening angle and the resolutions of beam position and energy-spread and calculate the coupling strength over all the electrodes of the BESM. The optimization design of the electrode opening angle for BESM has been done. Without considering the noise, the BESM with 20° electrode opening angle has the best sensitivity and resolution.
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