A target chamber has been developed and manufactured for carrying out simulation experiments with two simultaneous beams of heavy and light ions. The target chamber is equipped with elements for beam diagnostics and target-temperature control. The chamber allows the installation of plasma cleaning systems and nitrogen trap.

На основании моделирования динамики пучка разработана конструкция канала транспортировки ускорителя ТИПр-1 (ТяжелоИонный Прототип) для исследования процессов торможения тяжелых ионов с энергией до 100 кэВ/а.е.м. в газоразрядной плазменной мишени.

Проведено исследование наноструктуры стали ODS Eurofer (9%-CrWVTa + 0.5%Y2O3) после облучения ионами железа до повреждающей дозы 32 сна (смещений на атом). Эта сталь в исходном состоянии характеризуется наличием значительного числа ( 1024 м-3) наноразмерных (2–4 нм) кластеров, содержащих атомы V, Y, O и N. Анализ распределения различных химических элементов в исследованных объемах выявил изменение состава матрицы и наноразмерных кластеров под облучением. Проведено сравнение полученных данных с результатами реакторного облучения стали ODS Eurofer до дозы 32 сна.

The influence of Fe ion irradiation up to a dose of 10 dpa on the distribution of chemical elements and on the fine structure of advanced steel Rusfer EK-181 was studied by tomographic atom probe. The processes of element redistribution and changes in element composition, size, and number density of detected clusters were shown to occur. The increase in cluster size under irradiation was accompanied by the decrease in vanadium, chromium, and nitrogen concentrations in the clusters.

An imitation experimental technique on the irradiation with heavy ions of structural materials of nuclear power plants using tomographic atom probe analysis has been elaborated. The scheme of irradiation of specimens for atom probe analysis has been realized on a MEVVA ion source of an TIPr accelerator (ITEP) with ion energy 75 keV per charge. Test experiments with irradiation and analysis of samples of the EK-181 steel by aluminum ions to a fluence of ∼2 × 10 15 ion/cm 2 have been performed. Experiments on the Fe-ion irradiation of the samples of ODS EUROFER perspective steel for fission and fusion reactors to different damaging doses have been carried out. The analysis of distribution of different chemical elements in the volumes tested has revealed that under ion irradiation a change in the composition of nanosized clusters, which are present in the initial material takes place. Comparison of the data obtained with the results of reactor irradiation of the ODS EUROFER steel has been carried out. These data testify a correspondence between nanoscale changes in the steels oxide dispersion strengthened in imitation experiments and under the conditions of reactor irradiation.

A new beam transport channel was created on the ТИПр-1 accelerator at the Institute for Theoretical and Experimental Physics to study interactions between charged particles with an energy of 0.1 MeV/nucleon and matter with different aggregate states. The channel was designed for ion beams with specific weights as great as 35 au. It is composed of a transport line for an accelerated ion beam, three quadrupole lenses, the object of investigation (a gas, plasma, or foil sample), and a beam diagnostic system. The energy losses of doubly charged copper ions (Cu 2+ ) accelerated to 0.1 MeV/nucleon in gases were measured for first time in the spring of 2004.

The Metal Vapor Vacuum Arc (MEVVA) ion source and its modifications are investigated at the Institute of Theoretical and Experimental Physics (ITEP). In a series of the experiments, the possibility of increasing the charge state of the generated uranium ion beam was revealed. The charge state increases as a result of developing a high-current vapor vacuum arc discharge from the source cathode to an auxiliary anode located in an increasing axial magnetic field. The uranium ion beam with a total current of 150 mA was obtained, U 7+ uranium ions being 10% of the current.

The basic problems for construction of high intensity linear accelerator are providing of high efficiency, reliability and reduction of induced radioactivity in its parts. In the framework of ITEP feasibility stum of linac for nuclear transmutation on energy about 1 GeV with a current up to 100 mA some new version of the accelerator is considered. It is shown that the rigidity of the focusing has to be increased to prevent large particle losses. For the given value of beam current it can be achieved by the using as short lengths of focusing periods as possible. Main part of the linac consists of a large number of single-gap independent accelerating cavities. It is supposed, that the basic constructional material for these resonators will be graphite. It is shown, that such approach to design of main part of the linac allows to increase reliability of the accelerator, to reduce the requirements for mechanical tolerances of resonators and to improve parameters of a longitudinal movement of particles. It is also shown, that the replacement in large extent such conventional for linac design materials as steel, aluminium and copper on materials with small residual activation and low neutron production rate allows to increase the upper limit of permissible level of particle losses in linac. Graphite as main material of resonators will allow to build the linac with relatively low induced activization. It will provide handle maintainability at an achieved up to that time particle losses level.

A 3 MeV RFQ linac 1 has been constructed in the ITEP. Values of the linac design parameters attained in practice as well as some preliminary experimental results obtained at the machine launching with output current risingo-up to 100 mA are in the report below.