横向行波偏转结构中电磁场分布及腔间耦合系数的理论研究
Theoretical research on field distribution and coupling between cavities of RF deflector
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摘要: 模拟分析了横向行波偏转结构中传播的HEM11波的特性，并与加速模式TM01进行了比较。设计并加工完成了该偏转结构的实验腔，用谐振微扰法测出了中间腔的横向场分布曲线，并与HFSS模拟结果进行了比较，模拟结果和测试结果一致，其横向场的最大值在偏离轴心径向的中间位置。用HFSS模拟了腔的色散特性，对有稳定孔和没有稳定孔的情况进行了比较，用谐振法对实验腔的色散特性进行了测试，测试结果和模拟结果一致。通过对等梯度偏转结构等效电路的简化，给出了等阻抗结构的等效电路，定性分析了此偏转结构的腔间耦合情况，计算了腔间耦合系数，模拟结果和测试结果一致。Abstract: HEM11 mode in a transverse deflecting structure was simulated, analyzed and compared with TM01 mode. A prototype of this deflecting structure has been made, whose transverse field distribution is simulated with Ansoft HFSS. Perturbation method is used to measure the transverse field distribution with six cavities. The test results accord with the simulated ones. Dispersion curve is also simulated with Ansoft HFSS and it is consistent with the measured one. The equivalent circuit model of the deflector is given. The intercell coupling factors are calculated and the measured results accord with the simulated ones.
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