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 сеткакатод 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.
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.
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.
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 0.71.0 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.
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.
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.
The report describes electron beam electromagnetic forming system, which is destined for irradiation of cylindrical long goods, specifically for PE tubes 160mm diameter. System consists of electromagnet, power supply units, beam distributions control units, etc. for use at an electron accelerator at 5MeV and 50kW. The particular geometry of the magnet poles and their mutual arrangement are creating an irradiation field that allows the electrons to irradiate the surface of the product close to 90°.
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.
New industrial accelerator prototype with electron energy 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.
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.