STATUS OF HIGH-CURRENT ELECTROSTATIC ACCELERATOR - TANDEM FOR THE NEUTRON THERAPY FACILITY

Original 2.5 MeV, 40 mA proton tandem accelerator for the neutron therapy facility is described. The results of computer simulations of high current hydrogen negative ions beam transmission through the special geometry of potential electrodes with vacuum insulation are presented. The results of experiments with prototype vacuum insu- lation tandem accelerator are given also. Various charge- exchange targets are considered. Namely, targets are gas target with outward pumping, gas target with pumping inside of high-voltage electrode.