Design study of the UELV-10/5-15S accelerating structure

The UELV-10/5-15S electron linear accelerator is intended for use in the sterilization applications. Electron energy can be continuously variable from 5 to 10 MeV by changing the accelerated beam current. The 2 m long accelerating structure includes a standing wave buncher, a travelling wave accelerating part and an on-axis resonant RF load. Beam dynamics calculations have been made taking into account space charge forces. Optimization of the buncher parameters permitted to achieve capture efficiencies up to 75% with no external focussing. It is expected that beam powers from 13 kW to 15 kW will be obtained in the 5 to 10 MeV energy range

New 15 MeV electron accelerator for non-destructive testing

A 15 MeV accelerator with the dose rate from 80 to 120 Gy/min at 1m from the target has been designed and manufactured in NPK LUTS, the D.V.Efremov Institute, NIIEFA. The accelerator is intended for nondestructive testing (radiography, introscopy, tomography) of large scale products. Under tests an X-ray beam with the boundary energy of 15-16 MeV and dose rate of 100 Gy/min has been produced. When operating with longer pulse lengths of the accelerated electron current, the beam power was up to 140 Gy/min; with lower currents the 18 MeV energy was attained at a dose rate of 40-50 Gy/min. Biperiodic accelerating structure with axial coupling cells is applied in the accelerator. The accelerating structure buncher provides RF-focusing of the electron beam, therefore there is no need for focusing the solenoid. The focus spot diameter is no more than 2mm. To provide the electron beam stability, the accelerator is equipped with a system for automatic frequency tuning (AFT). The AFT system ensures both coarse tuning of the driver frequency against the temperature of the accelerating structure and fine tuning - against the minimum reflected power. The anode voltage of the klystron amplifier is stabilized by using a de-Q-ing system. A charging choke and pulse forming network (PFN) are located inside the irradiator unit to increase the distance between the modulator and irradiator up to 100m and to reduce losses when high-voltage high-current pulses are transmitted. The low-voltage klystron (anode voltage up to 55 kV) applied in the accelerator allows reducing the machine weight and dimensions (1100 kg and 2040x880x920mm). The accelerator is equipped with a PC-based automatic control system. In the accelerator intended for the radiographic inspection there is an external collimator with movable diaphragm jaws for testing small fragments of an inspected product

Unified 1.9…4.0 MeV linear accelerators with interchangeable accelerating structures for customs inspection

A series of compact linear electron accelerators for 1.9, 2.5 and 4.0 MeV equipped with a local radiation shielding has been designed and constructed in the NPK LUTS, the D.V. Efremov Institute (NIIEFA). The accelerators are intended for mobile facilities used for customs inspection of large-scale containers. Results of optimizing calculations of irradiator parameters and electron dynamics, verified under accelerators’ testing, are presented in the report. The main design approaches allowing the construction of unified accelerators with interchangeable accelerating structures for energies in the range of 1.9…4.0 MeV are also given.У НПК ЛУЦ НІІЕФА розроблені і виготовлені кілька моделей компактних лінійних прискорювачів електронів на енергії 1.9, 2.5, і 4.0 МеВ, що призначені для митного огляду великогабаритних контейнерів. Особливістю розробки є уніфікація вузлів прискорювача, що дозволила при використанні взаємозамінних структур, що прискорюють, у тому самому конструктивному виконанні одержувати прискорені електрони з енергією у діапазоні 1.9…4.0 МеВ. Приведено результати оптимізації параметрів опромінення, що підтверджені при іспиті прискорювачів.В НПК ЛУЦ НИИЭФА разработаны и изготовлены несколько моделей компактных линейных ускорителей электронов на энергии 1.9, 2.5, и 4.0 МэВ, которые предназначены для таможенного досмотра крупногабаритных контейнеров. Особенностью разработки является унификация узлов ускорителя, что позволило при использовании взаимозаменяемых ускоряющих структур в одном и том же конструктивном исполнении получать ускоренные электроны с энергий в диапазоне 1.9…4.0 МэВ. Приведены результаты оптимизации параметров облучения, которые подтверждены при испытании ускорителя

Accelerating units for commercial resonator LINACs model UELR-10-10S designed for radiation sterilization development and results of testing

Some specific design features of the accelerating units for LINACs model UELR-10-10S designed for radiation sterilization and the electron beam characteristics obtained experimentally are considered.Описываются некоторые особенности конструкции ускорителей модели УЭЛР-10-10С, приводятся и обсуждаются характеристики электронного пучка, полученные экспериментально.Описуються деякі особливості конструкції прискорювачів моделі УЕЛР-10-10С, приводяться і обговорюються характеристики електронного пучка, отримані експериментально

The DELPHI detector at LEP

DELPHI is a 4π detector with emphasis on particle identification, three-dimensional information, high granularity and precise vertex determination. The design criteria, the construction of the detector and the performance during the first year of operation at the large electron positron collider (LEP) at CERN are described. © 1991 - Elsevier Science Publishers B.V. (North-Holland)