X波段2维金属光子晶体的加速结构
X-band two-dimensional metallic photonic crystal accelerating structure
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摘要: 光子晶体加速结构能够有效地阻尼高频率加速管中的尾场，对高能加速器中因尾场引起的束流不稳定性起到抑制作用。探索了X波段2维金属光子晶体微波加速结构的研制方法，用机械加工的方式制作了较高品质因数的2维光子晶体结构谐振腔。理论计算表明，在光子晶体结构谐振腔外围放置吸波材料，可有效地吸收加速结构中的类TM11偶极模等高次模，而对加速主模类TM01模影响较小。设计和制作了工作频率为11.42 GHz，由4个腔构成的X波段2维金属光子晶体行波加速器，实验结果与数值模拟计算值吻合较好。Abstract: By introducing photonic crystal (or PBG) structure to the traditional disk-loaded accelerating tube, wakefields in the accelerating structure can be effectively damped. Machining methods of a 2D metallic PBG cavity were investigated and X-band PBG cavities with high quality factor were successfully fabricated. Suppression brought by the absorbers placed at the periphery of these PBG accelerating cavities is significant to the high order modes, but has very little effect on the accelerating mode TM01-like. Design and fabrication of a 4-cell traveling wave accelerating structure operating at the frequency of 11.42 GHz were accomplished and the cold test results were in agreement with the numerical simulations.
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Key words:
- photonic crystal /
- machining /
- wakefields damping /
- traveling wave accelerating structure
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