K. V. Gubin

Project of rotating carbon high-power neutron target, conceptual design

The project of high intense neutron source for SPES project in LNL, Legnaro has been developed. The source is based on rotating carbon target. The target is bombarded by deuteron beam with energy 20 MeV, diameter 1 cm, average power 100 kW, and cooled by its thermal radiation. The source can produce up to 10/sup 14/ neutron per second with energy within a range of several MeV and has lifetime of about a thousand hours.

Electron-Positron Pre-Injector of VEPP-5 Complex

The work on the construction of the ee factory complex is in progress at Budker INP. For an e ective operation of these machines the injector complex is designed. It consists of a preinjector for the production of e and e bunches and their acceleration up to an energy of 510 MeV, and a damping ring. This paper presents the general scheme and the current status of the preinjector.

High-Temperature Effects on the Electrical Properties and Macrostructure of Carbon Composites

The electrical conductivity of MPG-6 and MPG-7 carbon composites has been measured before and after 1.4-MeV electron irradiation and ac resistive heating up to degradation temperatures (above 2500°C). The results demonstrate that both heating and electron irradiation reduce the resistivity of the materials and increase the defect density at the macrostructural level, while x-ray diffraction analysis reveals no significant structural changes in the temperature range studied. Detailed characterization of the composites suggests that their strength is limited by crystallite or grain boundaries.

Status of work on the VÉPP-5 injection complex

The VÉPP-5 injection complex under construction at the Institute of Nuclear Physics of the Siberian Branch of the Russian Academy of Sciences is a powerful source of intense electron and positron bunches at 510 MeV, which covers all needs of the electron–positron colliding beam setups currently operating and under construction at the Institute of Nuclear Physics. The complex includes a 285 MeV linear electron accelerator, a 510 MeV linear positron accelerator, and an accumulator–cooler with beam injection and ejection channels. Intense work on the design, assembly, and tuning of the linear electron accelerator has been conducted in the last 2 yr. As a result, by August 2002 the linear electron accelerator was put into operation with all standard subsystems. By this time, the isochronous achromatic turning of the electron beam, a system for converting electrons into positrons, and the first accelerating structure of the linear positron accelerator were assembled and put into operation. All this made it possible to accelerate the positron beam up to 75 MeV. Preliminary results of tests of the linear accelerators are presented.

Production of intense beams of singly charged radioactive ions

An apparatus for the production of intense beams of singly charged radioactive ions operating in on-line regime is proposed. The radioactive atoms are produced in a uranium-graphite (UC) target bombarded with neutrons. The neutron flux is generated by a graphite neutron converter, which is bombarded with protons. The atoms of the produced isotopes are ionized in the electron beam generated with the electron gun and the ions of interest are extracted in a separator. The apparatus consists of the following parts. (1) Rotating converter dissipating a substantial power of proton beam. (2) UC target placed in a graphite container at high temperature. The atoms of radioactive isotopes can be extracted with a flow of noble gas. (3) Triode electron gun with ionization channel is placed inside the solenoid forming a focusing magnetic field. The cathode of the electron gun is a spout of the graphite container. The atoms of radioactive isotopes are carried with gas flow through the spout into the electron beam. (4) ...

Project of rotating carbon high-power neutron target. Simulation of the target thermal and mechanical operation conditions

The methods and results of the calculation of the 100kW neutron target thermal and mechanical conditions are presented. Calculation is made for optimization of the target design and consists of the thermal and mechanical stress determination.

Project of rotating carbon high-power neutron target. Research of graphite properties for production of high intensity neutron source

Results of MPG-class graphite properties research are presented. It is experimentally tested, that this kind of material can operate at high temperature conditions that are required for high power neutron target operation. The method of lifetime estimation is proposed. It is shown, that this material can stand under high temperature up to a few thousand hours.