A Low Frequency Beam Position Monitor

The beam position monitor described here is inductively driven by the 1.7-microsecond pulse envelope of a relativistic electron beam. Its principal virtues seem to be its simplicity, its inherently fixed zero position, and its adaptability to wide apertures. In the form presented, it has a 3.5-inch clear aperture; its minimum sensile beam current × beam displacement is about 2 × 10-4 ampere-millimeters; its ultimate spacial resolution is 0.1 millimeter.