Energy resolved measurement of the characteristics of Br ion diode

The characteristics of Br-magnetically insulated ion diode has been studied by new types of ion energy spectrometers. Dependence of the characteristics of the diode has been evaluated on the geometry of insulating magnetic field. Tum-on characteristics have been found to be improved when insulating magnetic flux (2πrdBr) increases with radius. Two dimensional, energy-resolved divergence angle of proton, carbon, oxygen, and negative ions have been evaluated independently. The divergence angle has been found to have weak dependence on energy or ion species, though ion trajectories strongly depend on them. Fine structure on the order of 1 mrad is observed in the measurement of energy-resolved injection angle distribution of the ion beam. This seems to be due to the non-uniformity of the anode plasma.