SPACE-CHARGE EFFECTS IN NEUTRALIZED ION-COMPENSATED BEAMS

Space charge effects in transport channels may be suppressed by using neutralized beams with equal currents of negative and positive ions. V ariations of beam envelopes in strong focusing channels result in an i ncrease of the incoherent oscillation frequency with the current. The frequency of the quadrupole coherent oscillations increases as well an d it moves to the resonance appearing due to strong focusing. Moreover , the beam perveance is limited by non-linear coherent resonances of t he same kind as in uniform beams. Space charge limitations with accoun t of all these effects have been calculated.