论文部分内容阅读
能量回收直线加速器技术是近年来一项重要技术。针对能量回收直线加速器的主直线加速器,本文使用多种射频软件优化设计了一种新型的1 500 MHz 5-cell超导腔。该腔加速模TM010的R/Q值达到550Ω,可以有效降低低温损耗。该腔的端cell采用扩大束管传输有害高次模方案将高次模传输出超导腔,良好地抑制了高次模。新腔型保持了较低的表面峰值场强与平均加速梯度的比值:Epk/Eacc=2.06,Bpk/Eacc=4.22 m T/(MV·m-1),避免了场致发射的风险,并且在中等加速梯度区域(15-20 MV·m-1)无二次电子倍增现象。模拟结果显示,该超导腔能够满足连续波、准连续波或高重复频率稳定运行的要求。
Energy recovery linear accelerator technology is an important technology in recent years. For the main linear accelerator of the energy recovery linear accelerator, a new type of 1 500 MHz 5-cell superconducting cavity is optimized and designed by using a variety of radio frequency software. The cavity acceleration mode TM010 R / Q value of 550Ω, can effectively reduce the low temperature loss. The end cell of the cavity adopts the scheme of enlarging the harmful high-order mode of beam transmission to transmit the high-order mode out of the superconducting cavity and restrain the high-order mode well. The new cavity maintains a lower ratio of the surface field intensity to the average acceleration gradient: Epk / Eacc = 2.06 and Bpk / Eacc = 4.22 mT / (MV · m-1), avoiding the risk of field emission and There is no secondary electron multiplication in the moderate acceleration gradient region (15-20 MV · m-1). The simulation results show that the superconducting cavity can meet the requirements of stable operation of continuous wave, quasi-continuous wave or high repetition rate.