论文标题
研究未来线性加速器的X波段介电磁盘加速结构
Investigations into X-band dielectric disk accelerating structures for future linear accelerators
论文作者
论文摘要
正在研究介电磁盘加速（DDA）结构，以替代传统磁盘加载的铜结构。本文从数值上研究了以TM02-π的高阶模式运行的有效X波段DDA结构。这种加速结构由介电磁盘和虹膜定期排列在金属外壳中。通过优化，可以大大减少金属壁上的RF功率损失，从而导致极高的质量因子Q_0 = 111064和极高的分流阻抗R_SHUNT =605MΩ/m。 RF到梁的功率效率达到46.6％，显着高于先前报告的CLIC-G结构，效率仅为28.5％。详细描述了常规细胞和末端细胞的最佳几何形状。由于加速模式的分散关系的宽带宽度，允许DDA结构具有最大数量的73个常规细胞，其频率分离为1.0 MHz，这比常规RF加速结构的频率优于。另外，发现DDA结构的短距离尾场低于Clic-G结构。
Dielectric disk accelerating (DDA) structures are being studied as an alternative to conventional disk-loaded copper structures. This paper investigates numerically an efficient X-band DDA structure operating at a higher order mode of TM02-π. This accelerating structure consists of dielectric disks with irises arranged periodically in a metallic enclosure. Through optimizations, the RF power loss on the metallic wall can be significantly reduced, resulting in an extremely high quality factor Q_0=111064 and a very high shunt impedance R_shunt=605 MΩ/m. The RF-to-beam power efficiency reaches 46.6% which is significantly higher than previously-reported CLIC-G structures with an efficiency of only 28.5%. The optimum geometry of the regular and the end cells is described in detail. Due to the wide bandwidth from the dispersion relation of the accelerating mode, the DDA structure is allowed to have a maximum number of 73 regular cells with a frequency separation of 1.0 MHz, which is superior to that of conventional RF accelerating structures. In addition, the DDA structure is found to have a short-range transverse wakefield lower than that of the CLIC-G structure.
