PROFILE MEASUREMENTS OF HIGH-INTENSITY LOW-ENERGY ION-BEAMS

A noninterceptive beam profile monitor based on the measurement of the light arising from the collision of the beam with the residual gas is being implemented in the 60 and 870 keV high intensity de-beam lines of the Paul Scherrer Institute accelerator complex. Beam profiles meas ured with this monitor are compared to those obtained with a calorimet er at 60 keV, and with a wire scanner at 870 keV. Wire scanners are pr esently used in the 870 keV beam line. Because of heat load limitation s in the scanner wires the beam has to be pulsed when profiles are tak en. However, because of space charge neutralization effects, the profi le of a pulsed beam may differ from that of a de beam. (C) 1996 Americ an Institute of Physics.