Beam Probes for the Chalk River Superconducting Cyclotron

The cyclotron has two internal beam probes that move in the midplane from outside the yoke to 135 mm radiuts. Interchangeable heads allow differential and integral beam current measurements of radial turn pattern or axial beam position and width, as a function of probe radius. Measurements on extracted beams will use one radial probe, a stub probe located downstream of the electrostatic deflector and an extraction probe that can be inserted up the beam line from just outside the yoke wall. The probes, the control system, and initial experiences with the system will be described.