В ИЯФ СО РАН им. Г.И. Будкера разработан новый мощный (до 100 кВт) промышленный линейный ускоритель электронов ИЛУ-14 на энергию 7.5–10 МэВ. Рабочая частота ускорителя 176 МГц, полный к.п.д. 26%. Ускоритель имеет модульную структуру, что позволяет путем изменения модульной комплектации менять в определенных пределах энергию электронов и мощность в пучке. В настоящее время изготовлен и успешно прошел испытания прототип этого ускорителя. В экспериментах подтверждены расчетные параметры: энергия 5 МэВ, средний за в.ч.-период ток пучка 600 мА, импульсная мощность пучка 2.5 МВт и электронный к.п.д. ускоряющей структуры 68%. Благодаря подаче дополнительного в.ч.-напряжения на зазор сетка–катод пушки достигнуто токопрохождение электронного пучка 96% и получен малый энергетический разброс пучка. Прототип ускорителя ИЛУ-14 может быть использован как самостоятельный ускоритель с мощностью в пучке 50 кВт.

This paper describes the industrial electron accelerators of the ILU type and their usage for sterilization. The ILU machines produced by Budker Institute of Nuclear Physics have energy range of 0.8-10 MeV and beam power up to 100 kW, and they are working in industries all over the world. The ILU-10 and ILU-14 machines are described as well as the industrial sterilization facility based on ILU-6, ILU-10 and ILU-14 machines.

A new high-power (up to 100 kW) industrial electron linear accelerator ILU-14 for energies of 7.5–10.0 MeV has been developed by the Budker Institute of Nuclear Physics. The operating frequency of the accelerator is 176 MHz, and the total efficiency is 26%. Owing to the modular structure of the accelerator, the electron energy and the beam power can be varied within certain limits by changing the modular arrangement. A 5-MeV prototype of this accelerator has been produced and successfully tested. Its design parameters verified in the experiments are as follows: the beam current averaged over the RF period is 600 mA, the beam pulse power is 2.5 MW, and the electron efficiency of the accelerating structure is 68%. By applying an additional RF voltage to the electron gun cathode-grid gap, a 96% transmittance of the beam current has been attained at a minor beam energy spread. The prototype of the ILU-14 accelerator can be used as an accelerator with a beam power of 50 kW.

Описаны результаты численных и экспериментальных исследований по сужению энергетического спектра электронов на однорезонаторном импульсном ускорителе ИЛУ-10 (энергия электронов 5 МэВ, средняя мощность пучка 50 кВт, рабочая частота 116.3 МГц) путем подачи дополнительного внешнего высокочастотного напряжения на промежуток сетка–катод триодной высокочастотной пушки. Полученные результаты показали, что без дополнительного в.ч.-напряжения в пределах 5% энергетического разброса находится 62% мощности пучка, а при подаче дополнительного напряжения рабочей частоты в пределах этого разброса – уже 74% мощности пучка. И наконец, при дополнительном напряжении третьей гармоники в 5% энергетического разброса находится 93% мощности пучка.

At Budker INP, Siberian Branch of Russian Academy of Science, a 5MeV section for high-power industrial linear electron accelerator has been tested at full voltage. The accelerator operates at 176MHz. The obtained beam-pulsed power of 2.9MW at the structure electron efficiency of 73% is close to the simulation value. Improvements of beam transportation and energy spectrum due to the injection regime optimization were experimentally proven. The paper describes the accelerating structure RF conditioning procedure and presents the results of the full voltage tests including the electron beam energy spectrum and transverse size at the accelerator output measurement results.

Results of numerical and experimental investigations of electron energy spectrum narrowing by applying an external boosting HF voltage to the grid-cathode gap of a triode HF gun in the ILU-10 single-cavity pulsed accelerator (electron energy, 5 MeV; mean beam power, 50 kW; operating frequency, 116.3 MHz) are described. These results showed that, without a booster HF voltage, 62% of the beam power is within 5% of the energy spread and, after a booster voltage of the operating frequency is applied, as much as 74% of the beam power falls within these limits. Finally, at a booster voltage of the third harmonic, 93% of the beam power lies within 5% of the energy spread.

The report describes ILU type industrial electron accelerators. It describes their main parameters, design, principle of action, electron beam extraction devices, wide set of auxiliary equipment for various technological processes and ways of their usage.

At Budker INP SB RAS, a prototype of high-power industrial electron accelerator for, the energy of 5 MeV, named ILU-12, has been successfully commissioned. The accelerator operates at 176 MHz. The paper presents the accelerator concept together with simulation results for the accelerating structure, beam injection and dynamics. The obtained beam pulsed power of 1,5 MW at the structure electron efficiency of 67% is close to the simulation value. Improvements of beam transportation and energy spectrum due to the injection regime optimization were experimentally proven. The results obtained are discussed.

RF gun for ILU-12 accelerator is described in the paper. Mechanism of beam transportation and energy spectrum improvements by applying an additional RF voltage of the operating frequency to the cathode-grid gap is considered in detail. Simulated energy spectrum and density profile of electron beam at the accelerator output are presented.

At Budker INP SB RAS, a prototype of high-power industrial electron accelerator for the energy of 5 MeV, named ILU-12, has been successfully commissioned. The accelerator operates at 176 MHz. The paper presents the accelerator concept together with simulation results for the accelerating structure, beam injection and dynamics. The obtained beam pulsed power of 1,5 MW at the structure electron efficiency of 67% is close to the simulation value. Improvements of beam transportation and energy spectrum due to the injection regime optimization were experimentally proven. The results obtained are discussed. PACS: 29.17+w

Design of the power input is described in the paper. The power input is a low-impedance coaxial line with the wave resistance of about 30 Ohm. One of the line ends is shorted, the other turns into the coupling loop, which inductance is compensated by the stray capacitance. The vacuum section of the power input is separated from the atmosphere by the cylindrical insulator made of 22XC ceramics. The coaxial part of the power input is divided into the 176 MHz quarter-wave-length insulator and quarter-wave-length transformer by the point of the 50 Ohm RF power feeder connection. Power input testing technique is described in the paper together with the results obtained when operating at the high power level.

At Budker INP SB RAS, a single module for a new 100 kW industrial accelerator with electron energy of 7.5‐ 10 MeV has been successfully tested in pulsed operating regime. The accelerator operates at 176 MHz, expected wall plug to electron energy efficiency is 25‐30%. The paper presents the accelerator concept together with simulation results for the accelerating structure, beam injection and dynamics. The obtained structure electron efficiency of 67% and average electron beam current are close to the expected values. Improvements of beam transportation and energy spectrum due to the injection regime optimization were experimentally proven. The results obtained are discussed.

New industrial accelerator prototype with electron en- ergy up to 5 MeV, average beam power of 300 kW, and duty factor of 14% is under construction at Budker INP. At present, the design work is completed, the accelerating structure is under production at INP workshop. The paper presents a general description of the accelerator, its block diagram, and experimental results obtained at recent tests of the accelerating structure and injection unit.

Design work has been completed for the accelerating structure of high-power electron accelerator with 5 MeV, 300 kW, 176 MHz parameters. The structure is being produced in BINP workshop. The paper presents the design of of experimental the accelerating structure which consists of a chain of coaxial cavities, and block diagram workbench. Structure of the main accelerator blocks and their degree of fabrication are viewed.

The paper deals with processes during injection of continuous electron beam into a standing wave accelerating structure. Not all the electrons of the beam are captured into the process of acceleration. Some of them are scattered on the accelerating structure walls or return to the cathode. At short beam current pulses, it is possible to place a cathode on the system axis. In a case of high average beam power, it is necessary to inject a beam angularly to exclude hitting the cathode by returned electrons.

The report describes a project of industrial electron accelerator prototype for electron energy up to 5 MeV and beam power up to 300 kW specially designed for use in industrial applications. On the one of stage of work for design of its accelerating system we shall use the existing generator designed for ILU-8 accelerator. It is realized on the GI-50A triode and provides the pulse power up to 3 MW and up to 20-30 kW of average power. In the report the basic concepts and a condition of the project for today are reflected.

At Budker INP, the work is in progress on development of high-efficiency, high-power electron accelerator proto-type. The accelerator has a modular structure and consists of a chain of accelerating cavities connected by on-axis coupling cavities with coupling slots in the common walls (the coupling constant is about 0.08). Main parameters of the accelerator are: operating frequency of 176 MHz, electron energy of up to 5 MeV, average beam power of 300 kW. The paper presents results of 3D electromagnetic field numerical simulations for ILU-12 accelerating structure with recovery of quadrupole filed disturbance because of large coupling holes. The results show that accelerating cell geometry chosen eliminates coupling slot influence on the beam dynamics.