径向馈入和轴向馈入对感应加速腔性能的影响

Effects of pulse power feed-in method on induction accelerating cavity parameters

感应加速腔有径向馈入和轴向馈入两种常用的脉冲功率馈入方式。在理论上分析了不同功率馈入方式对感应加速腔输出电压平顶的影响,并对分析结果进行实验论证。实验采用1B2C结构,用相同的脉冲功率源馈入径向腔和轴向腔,测量此两种加速腔的电压波形。测得轴向腔±1%电压平顶时间为61 ns,径向腔±1%电压平顶时间为62 ns,两种腔都可满足±1%电压平顶大于60 ns的要求。此外对不同功率馈入方式导致的横向阻抗的变化进行了数值模拟,分别计算了采用这两种馈入方式的加速腔模型的横向阻抗,发现轴向加速腔的横向阻抗较小。

For induction accelerating cavity, there are two pulse power feed-in methods： the axial method and the radial method. The effects of different pulse power feed-in methods on the flat-top voltage width of induction accelerating cavities were analyzed and some experiments were carried out to prove this analysis. In the experiments, one Blumlein PFL was used to feed-in ＂axial＂ cavity and “radial” cavity at the same time, and a 62 ns width was obtained in the “axial” cavity and a 61 ns width in the “radial” cavity for ±1% voltage flat-top. In additional, the two cavities＇ transverse impedances were calculated, and the result showed that the “axial” cavity had lower transverse impedance than the “radial”cavity.