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US 4,060,762 AGranted
Bimodal cavity resonator beam position monitor
AssigneeAtomic Energy of Canada Limited
InventorJoseph McKeown
Life of this patent
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Abstract
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.
Claims5
A charged particle beam position monitor comprising:
- resonant cavity means capable of being excited in a first mode about the x-axis of the cavity means and in a second mode orthogonal to the first mode about the y-axis of the cavity means, said cavity means having beam holes in opposite surfaces of said cavity means, said beam holes being concentric with a z-axis through the intersection of the x-axis and y-axis, to allow the particle beam to pass through said cavity means such said first mode is excited in the cavity when the centroid of the beam is displaced along the x-axis and said second mode is excited in the cavity when the centroid of the beam is displaced along the y-axis;
- tuning means mounted on said cavity means for tuning the orthogonal modes to the same frequency;
- first detector means coupled to said first mode in said cavity means to provide a signal as a function of beam displacement along the x-axis;
- and
- second detector means coupled to said second mode in said cavity means to provide a signal as a function of beam displacement along the y-axis.
2 more elements
Dependencies are inferred from the claim text.