  The experimental research on the irradiation of the functional design
materials by the Helium ions in the linear accelerator is conducted. The
experimental measurements techniques and data on the irradiation of the
functional design materials by the Helium ions with the energy up to 4 MeV,
including the detailed scheme of experimental measurements setup, are
presented. The new design of accelerating structure of the IH-type such as
POS-4, using the method of alternate-phase focusing with the step-by-step
change of the synchronous phase along the focusing periods in a linear
accelerator, is developed with the aim to irradiate the functional design
materials by the Helium ions. The new design of the injector of the charged
Helium ions with the energy of 120 KeV at the output of an accelerating tube
and the accelerating structure of the type of POS-4 for the one time charged
Helium ions acceleration in the linear accelerator are researched and
developed. The special chamber for the irradiation of functional design
materials by the Helium ions is also created. In the process of experiment, the
temperature of a sample, the magnitude of current of Helium ions beam and the
irradiation dose of sample are measured precisely. The experimental measurement
setup and techniques are fully tested and optimized in the course of the
research on the electro-physical properties of irradiated samples and the
thermal-desorption of Helium ions in a wide range of temperatures
