An electron miniaccelerator on the basis of Tesla transformer for nondestructive testing of charged particle beams

An electron miniaccelerator on the basis of Tesla-transformer for nondestructive testing of charged particle beams with operating voltage 120…200 kV, half-wave duration 4 mks and diagnostic beam current within few mA is described. The primary circuit is switched by IGBT. The gun control and filament circuit power supply (impregnated cathode with 1.2 mm diameter) are realized through high frequency isolated transformer. The accelerating tube is made of sectional welded metal ceramics insulator (ceramics 22HS with diameter 95/85 mm).The accelerator test results are presented.Описан миниускоритель электронов на основе трансформатора Тесла с рабочей амплитудой напряжения 120…200 кВ при длительности полуволны 4 мкс и током диагностичеcкого пучка в пределах нескольких мА. В качестве ключа первичного контура используется IGBT. Питание накала и цепей управления пушки (импрегнированный катод диаметром 1.2 мм) ускорителя осуществляется с помощью высокочастотного разделительного трансформатора броневого типа. Металлокерамический узел выполнен на базе керамики 22ХС диаметром 95/85 мм, соединяемой с электродами термокомпрессионной сваркой. Приведены результаты испытаний миниускорителя.Описано мініприскорювач електронів на основі трансформатора Тесла з робочою амплітудою напруги 120...200 кВ при тривалості напівхвилі 4 мкс і струмом діагностичного пучка в межах декількох мА. Як ключ первинного контуру використається ІGBT. Живлення розжарення й ланцюгів керування пушки (імпрегнований катод діаметром 1.2 мм) прискорювача здійснюється за допомогою високочастотного розділового трансформатора броньового типу. Металокерамічний вузол виконаний на базі кераміки 22ХС діаметром 95/85 мм, що з'єднує з електродами термокомпресіонним зварюванням. Наведено результати випробувань мініприскорювача

Non-destructive singlepass monitor of longitudinal charge distribution in an ultrarelativistic electron bunch

We present here the first experimental test of a singlepass non-destructive method of monitoring of longitudinal charge distribution in an intensive relativistic electron bunch. This method is based on the scanning of a thin electron beam within the energy range 20-100 keV in the electromagnetic field of an intensive relativistic bunch

Project of deuteron accelerator based neutron source for rib production

The project of a high-intense neutron source for the SPES project in LNL, Legnaro, Italy [1] is developed. The source is based on the rotating carbon target. The target is bombarded by the deuteron beam with energy 20 MeV, diameter 1 cm, average power 100 kW. The target is cooled by its thermal radiation, and its temperature can reach 1800ºC. It is shown that high density graphite can be used as a material for neutron production. The source can produce up to 10¹⁴ neutrons per second with energy within few MeV - few dozens MeV range, its lifetime is around few thousand hours

Project of a fast neutron target based on a 10 MeV 300 kW proton accelerator

Project of targets for high intense neutron source is proposed. The source is based on a proton continuous accelerator with the 10 MeV particle energy and up to 300 kW mean beam power. Problems of fabrication of these targets are discussed. Hot solid state and liquid target designs are considered. Maximum admissible target parameters are presented. Advantages and disadvantages of various types of target for neutron production are discussed

Petroleum potential of Lower Jurassic and Pre-Jurassic reservoirs of Ust-Tym megadepresion

The relevance of the research is caused by the need of reproduction of oilfields area resource base in southeast of Western Siberia. The main aim of the research is to identify and to propose the priority areas for exploration and development of oil and gas complexes of the Lower Jurassic and Pre-Jurassic in the poorly studied territory of Ust-Tym megadepression. Objects of researches  are the Lower Jurassic reservoir — layers Yu15 and Yu16, immediately contacting with maternal Togur suite, and Pre-Jurassic reservoir — collectors of Triassic weathering crust and collectors of Paleozoic basement. Methods of researches include reservoirs geomapping, analysis of generated oil density distribution, evaluation and analysis of density distribution reservoirs of primary accumulated oils, zoning of reservoirs according to the prospectivity degree. Systematized complex of geological and geophysical data on the object of research. The authors have given the volumetric-areal characterization for Lower Jurassic and Pre-Jurassic reservoirs —plotted the maps of the total thickness and quality collectors. Analyzed of generated oil density distribution, obtained based on the mapping by geotemperature criterion the paleo-sources of Togur deposits generation. The maps of distribution of relative density of the accumulated resources have been plotted and zoning for Lower Jurassic and Pre-Jurassic reservoir have been carried out. The areas of priority for searching have been proposed for Lower Jurassic the central part of Negotskogo mezoprogiba, for reservoir of weathering crust the northeast side of Ust-Tym megadepression, for reservoir rocks of the basement the north-eastern slope of the north-Parabel megamonoklinalii and the southern Pyzhinskogo mezodepression. Consistency of geophysical forecast data drilling is estimated at 95%. It has been concluded that the value of geothermal data is essential to solve a conceptual problem about the source of hydrocarbons

Measurement of the Response Time of the Delay Window for the Neutron Converter of the SPIRAL2 Project

Research and development of a safety system for the SPIRAL2 facility has been conceived to protect the UCx target from a possible interaction with the 200 kW deuteron beam. The system called "delay window" (DW) is designed as an integral part of the neutron converter module and is located in between the neutron converter and the fission target. The device has been designed as a barrier, located directly behind the neutron converter on the axis of the deuteron beam, with the purpose of "delaying" the eventual interaction of the deuteron beam with the UCx target in case of a failure of the neutron converter. The "delay" must be long enough to allow the interlock to react and safely stop the beam operation, before the beam will reach the UCx target. The working concept of the DW is based on the principle of the electrical fuse. Electrically insulated wires placed on the surface of a Tantalum disk assure a so called "free contact", normally closed to an electronic circuit located on the HV platform, far from the radioactive environment. The melting temperature of the wires is much less than Tantalum. Once the beam is impinging on the disk, one or more wires are melted and the "free contact" is open. A solid state relay is changing its state and a signal is sent to the interlock device. A prototype of the DW has been constructed and tested with an electron beam of power density equivalent to the SPIRAL2 beam. The measured "delay" is 682.5 ms (σ=116 ms), that is rather long in comparison to the intrinsic delays introduced by the detectors itself (2 ms) and by the associated electronic devices (120 ns). The experimental results confirm that, in the case of a failure of the neutron converter, the DW as conceived is enable to withstand the beam power for a period of time sufficiently long to safely shut down the SPIRAL2 accelerator