Beam-induced wakefield observation in X -band choke-mode cavities
Beam-induced wakefield observation in X -band choke-mode cavities
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DOI：
10.1103/physrevaccelbeams.19.081001
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发表时间：
2016-08
影响因子：
1.7
通讯作者：
H. Zha;C. Jing;J. Qiu;E. Wisniewski;M. Conde;J. Power;D. Doran;Wanming Liu;Jiaru Shi;Chen Li;W. Gai;Huaibi Chen
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文献类型：
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作者：
H. Zha;C. Jing;J. Qiu;E. Wisniewski;M. Conde;J. Power;D. Doran;Wanming Liu;Jiaru Shi;Chen Li;W. Gai;Huaibi Chen
X波段扼流模结构作为紧凑型直线对撞机（CLIC）主直线加速器加速结构的替代设计，目前正在研究中。扼流模结构的几何设计是为了保证强抑制束流诱导的长程横向韦克菲尔德场，从而保持CLIC主直线加速器中束流的稳定性和质量。在阿贡韦克菲尔德加速器设施进行的实验，在这项研究中，以验证的韦克菲尔德抑制器的设计。测量了三单元扼流模结构中的束流感应射频信号，测量结果与仿真结果吻合较好。测量结果还表明，强阻尼高阶偶极模式的品质因数$Q$的10至20。第一和第二偶极模式的频率之间的差约为3GHz，这验证了在后续聚束（0.5ns）时抵消偶极模式的特殊设计。
The $X$-band choke-mode structure is currently being studied as an alternative design for the accelerating structure of the compact linear collider (CLIC) main linac. The geometry of the choke-mode structure is designed to ensure the strong suppression of the beam-induced long-range transverse wakefield and therefore maintain the stability and quality of the beam in the CLIC main linac. Experiments conducted at the Argonne Wakefield Accelerator Facility are presented in this study to verify the design of the wakefield suppressor. The beam-induced radio frequency (rf) signals in a three-cell choke-mode structure were measured, and measured results show good agreement with the simulation results. The measured results also show strong damping in high-order dipolar modes with a quality factor $Q$ of 10 to 20. The difference between the frequencies of the first and second dipole modes is about 3 GHz, which validates the special design of the cancelling dipole modes at the time of the succeeding bunch (0.5 ns).