A system for rotating nonmonochromatic electron beams consisting of two identical magnetic mirrors, is described. The distribution of the magnetic field along the depth of the mirrors is formed in such a way that an increase in the magnetic field at the entrance to the mirror follows its decline according to a certain law. As a result, it is possible to compensate for the angular divergences of nonmonochromatic electron beams in the gaps of the mirrors and to obtain a beam with phase characteristics close to the initial ones after rotation. Calculations and experimental test data of such a device are given when the electron beam is rotated through 180°.

This report describes industrial accelerators type ILU as well as their basic parameters and characteristics. Their current applications in a cable industry, medicine and other fields are outlined. Recent experiments with food products irradiation are described, new features and ILU machines application in food industry are discussed. Some information about problems in the Russian legislation related tofoodstuff treatment by ionizing radiation is given.

Growing interest to product irradiation by E-beams and X-rays calls for dedicated industrial electron accelerators. BINP has developed ILU-14 radio-frequency pulsed linear accelerator capable of providing 100 kW beam at 7.5-10 MeV. The accelerator has fast removable X-ray converter and can operate both in e-beam and X-ray processing modes. The machine utilizes a low frequency (176 MHz) 6-cells SW accelerating structure. BINP developed this machine as a turn-a-key equipment. Technical details and test results will be presented.

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.

A new high power (up to 100 kW) industrial linear electron accelerator ILU-14 for energy of 7.5–10 MeV is under construction at Budker INP. The accelerator operates at 176 MHz with total efficiency of 26 %, its modular structure allows the electron energy and beam current to be varied within certain limits by changing the modular arrangement. The 5 MeV prototype of the accelerator was created and successfully tested in 2009. The designed average beam current of 600 mA with pulsed power of 2.5 MW and accelerating structure electron efficiency of 68 % were obtained during experiments. Applying an additional RF voltage to the electron gun cathode-grid gap allowed a beam current passing of 96 % with minor beam energy spread. The paper presents results of the numerical and experimental study of the accelerator systems together with the latest tests on the accelerator prototype.

An ILU-8 single-cavity electron linear accelerator has been designed for use in industrial radiation technology systems for electron irradiation of materials and products. Experimental data of accelerator adjustment and results of measurements of the accelerated beam parameters in modes characteristic of industrial applications are presented. The main parameters of the accelerator are as follows: the electron energies are 0.7–1.0 MeV and the beam power is 20 kW at an average current of up to 25 mA. The accelerator operates in a pulsed mode: the pulse duration is 800 μs, and the pulse repetition frequency is 50 (60) Hz. The cavity is excited by a single-stage self-excited oscillator based on a GI-50A tube with feedback via the cavity at a frequency of 175.6 MHz. The accelerating cavity, together with a system of beam extraction into the atmosphere, can be located inside the biological shielding composed of steel slabs with a total mass of 76 t.

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.

Однорезонаторный линейный ускоритель электронов ИЛУ-8 предназначен для облучения электронами материалов и изделий в составе радиационно-технологических установок промышленного назначения. Приведены экспериментальные данные по наладке ускорителя и измерению параметров ускоренного пучка для режимов промышленного применения. Основные параметры ускорителя: энергия электронов 0.7–1.0 МэВ, мощность пучка 20 кВт при среднем токе до 25 мА. Режим работы импульсный: длительность импульсов 800 мкс, частота повторения импульсов 50(60) Гц. Возбуждение резонатора осуществляется от однокаскадного автогенератора на лампе ГИ-50А с обратной связью через резонатор на частоте 175.6 МГц. Ускоряющий резонатор с системой выпуска пучка в атмосферу может быть размещен внутри биологической защиты из стальных плит общей массой 76 т.

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.

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.

The report describes the industrial electron accelerator ILU-10 for electron energy up to 5 MeV and beam power up to 50 kW specially designed for use in industrial applications. The operation regime is a pulsed regime, the maximum pulse repetition rate is 50 (60) Hz, a pulse duration is 0.4-0.5 ms.

GENERAL DESCRIPTION OF ILU-10 ACCELERATOR The report describes the industrial electron accelerator ILU-10 for electron energy up to 5 MeV and beam power up to 50 kW specially designed for use in industrial applications. The ILU-10 accelerator generates the vertical electron beam. The beam line turns the beam through an angle of 90° and transports the beam to the vertically posed X-ray converter to generate the horizontal beam of X-rays. The basic component of the accelerator is a toroidal copper cavity with an operating frequency of 116 MHz with axial protrusions forming the accelerating gap having length of 270 mm. The protrusion shape was chosen from the conditions of the formation and focusing of an electron beam in the processes of its injection, acceleration and further passage through the extraction system with minimum losses.