Bimodal cavity resonator beam position monitor

摘要

A charged particle beam position monitor having a resonant cavity which is excited in a first mode if the monitored beam passing through it is displaced along the x-axis, and is excited in a second mode orthogonal to the first if the monitored beam passing through it is displaced along the y-axis. These modes are tuned to the same frequency and may be independently detected. The X and Y coordinates of the beam are determined by the amplitude and phase of the detected first and second orthogonal modes respectively.