Here, we introduce and analyze a novel concept of using one single cavity to support dual modes instead of using separate cavities. One advantage of using a dual-mode cavity is that only one cavity needs to be manufactured, which is space-saving and obviously economic. Apart from this, by operating both the fundamental mode and the certain harmonic mode simultaneously in one single cavity, bunch lengthening during the acceleration process could be linearly achieved, providing great potential in improving the beam brightness in linacs, storage rings, and other accelerating structures. Through the detailed design study, a structure combining the fundamental and the chosen second harmonic modes is characterized. The RF performance of the designed bimodal cavity is deeply analyzed, and it could be put into actual use for different goals to improve either the beam dynamic characteristics or the compactness of the certain system.

中文翻译：

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一种新型双峰腔的设计

在这里，我们介绍并分析了使用一个单腔来支持双模而不是使用单独的腔的新概念。使用双模腔的优点之一是只需要制作一个腔，既节省空间又明显经济。除此之外，通过在一个单腔中同时操作基模和特定谐波模式，可以线性地实现加速过程中的束加长，为提高直线加速器、存储环和其他加速结构的光束亮度提供了巨大的潜力. 通过详细设计研究，表征了一种结合基波和所选二次谐波模式的结构。对设计的双峰腔的射频性能进行了深入分析，