Neutralized transportation of high power ion beams in drifting tube

The transportation experiments of high power ion beams(HPIB) on the FLASH Ⅱ accelerator are presented.The transportation of HPIB in different transporting conditions and distances was studied.The influence of neutralization on the radius of beam and the uniformity of the current distribution was analyzed and numerically simulated.The results of the simulation are consistent with the experimental data.Being neutralized,the HPIB can be effectively transported to a distance farther than 80 cm.During the transportation,the distribution of current is uniformed;the defocus of HPIB is reduced.