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This paper presents compact power supply system for the helium ion linac’s injector. The system consists of high-voltage modulator, power supplies of cathode filament, solenoid and arc modulator. It is designed on modern semi-conductor base. Using of the designed power supply system allowed to decrease the power consumption and to get rid of spurious capacitances and pickups. As a result of improving the continuous adjustment modulator and high-voltage pulse stabilization scheme, the accelerated beam current has increased twice.

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The change in the radiation characteristics of the surface of tungsten was studied. Helium ions beams with energies of 0.12 and 4 MeV were used. Curves of ionization and damage are got on length of free run of ions of helium. The change the radiation characteristics of the surface of tungsten was studied. In the case of treatment with a beam of helium ions with energies of 0.12 MeV an increase in the hardness of the tungsten surface was found. Bubbles development has been studied. The appearance of tungsten tendrils around the bubbles, the formation of hills and valleys was considered.