In the work presented here a stabilization system of the output voltage of the HV source with an output voltage of up to 1.5 MV and a power of up to 100 kW is considered. The source is based on the cascade generator with an inductive coupling and parallel feeding of stages. The source is designed for producing accelerating voltage in the tandem-accelerator. Estimates of the output voltage ripple are given and methods for its suppression are proposed.

Novel 2.5 MeV, 40 mA tandem accelerator is presented and discussed. Results of work of ion source and choice of ion optical channel and charge-exchange target are shown. Results of experiments on study of high voltage durability of 45 mm vacuum gap with large square electrodes and determination of dependence of autoemission current/on electric field intensity are reported.

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.

In the work presented here the parameters of powerful electron accelerators of continuous action are given and the main systems of the accelerator and a wide set of supplementary devices extending the application range of the accelerator are given and some directions of further development are noted.