High precision superconducting cavity diagnostics with higher order mode measurements
High precision superconducting cavity diagnostics with higher order mode measurements
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DOI：
10.1103/physrevstab.9.112802
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发表时间：
2006
影响因子：
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通讯作者：
S. Molloy;J. Frisch;D. McCormick;Justin E. May;M. Ross;T. Smith;N. Baboi;Olaf Hensler;Lyudvig Petrosyan;O. Napoly;R. Paparella;S. Nagaitsev;M. Wendt
中科院分区：
文献类型：
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作者：
S. Molloy;J. Frisch;D. McCormick;Justin E. May;M. Ross;T. Smith;N. Baboi;Olaf Hensler;Lyudvig Petrosyan;O. Napoly;R. Paparella;S. Nagaitsev;M. Wendt
在DESY的闪光装置上的实验已经证明，超导腔中感应的高阶模可以用来提供各种束流和腔诊断。模式的轴可以根据在偶极HOM模式中产生最小功率的束流轨道来确定。偶极模的相位和幅度可以用来获得高分辨率的束流位置信息，而单极模的相位可以用来测量相对于加速器射频的束流相位。对于大多数超导加速器，现有的高阶模式耦合器提供了必要的信号，下混频和数字化电子学是直接的，类似于传统的束流位置监测器。
Experiments at the FLASH facility at DESY have demonstrated that the higher order modes induced in superconducting cavities can be used to provide a variety of beam and cavity diagnostics. The axes of the modes can be determined from the beam orbit that produces minimum power in the dipole HOM modes. The phase and amplitude of the dipole modes can be used to obtain high resolution beam position information, and the phase of the monopole modes to measure the beam phase relative to the accelerator rf. For most superconducting accelerators, the existing higher order mode couplers provide the necessary signals, and the downmix and digitizing electronics are straightforward, similar to those for a conventional beam position monitor.