Production of pulsed ion beams by ECR ion source afterglow mode

To satisfy the requirements of the Heavy Ion Cooling Storage Ring which is under construction at Lanzhou, afterglow mode was tested with the IMP 14.5G Rz ECR ion source to produce pulsed ion beams. The afterglow phenomenon was clearly observed and the pulsed ion beams of Ar11+ and Ar12+ were successf ully produced with pulsed rf power. The peak current of the pulsed beam is typically two or three times higher than that of ew beam. The afterglow pea k current could increase by a factor of six after further optimization duri ng the experiment. The mechanism of the afterglow mode was studied and disc ussed on basis of the test results and physical model of ECR ion source.