Ion beam co-ordinate monitor

It is noted that one standard noncontacting method for measuring the center coordinate of an ion-beam is based on processing the signals induced by the beam on suitably shaped electrons. The technique can be applied to continuous beams generated in low-energy implanting machines. It is shown that the coordinate of a continuous low-energy beam can be determined by measuring the angle of inclination of an elliptical pattern observed on an oscilloscope whose deflecting plates are driven directly by two noise-like signals induced by the beam on two electrostatic induction electrodes.