[en] This paper describes the control system of the injector for the LINAC-800 linear electron accelerator. The architecture of the control system, the equipment, and software are presented. This system is part of the first segment of the control system of the LINAC-800 electron accelerator.

[en] The Automatic System of Radiation Safety Control (ASRSC) of the LINAC-800 linear electron accelerator is designed to ensure radiation safety for accelerator personnel during regular operations and in emergency cases. The results of calculating the emission power used to develop the ARPS are given. Both hardware and software components of the radiation control system are described. This paper also presents a description of the interlock and signalization system.

[en] Photocathode electron guns are key to the generation of high-quality electron bunches, which are currently the primary source of electrons for linear electron accelerators. The photogun test bench built at the Joint Institute for Nuclear Research (JINR) is currently being used to further develop the hollow (backside irradiated) photocathode concept. A major achievement was the replacement of the hollow photocathode by a technologically more feasible transmission photocathode made from a metal mesh that serves as a substrate for films of various photomaterials. A number of thin-film cathodes on quartz glass substrates are fabricated by photolithography. The vectorial photoeffect (related to the surface-normal component of the wave electric field) is observed and found to significantly affect the quantum efficiency. The dependence of the quantum efficiency of diamond-like carbon photocathodes on the manufacturing technology is investigated. The Rutherford backscattering and elastic recoil detection techniques are combined to carry out an elemental analysis of the films. An estimate of the emittance of a 400 pC electron beam is obtained using the cross-section method. (conferences and symposia)

[en] The scheme of the energy-dispersive EXAFS spectrometer is discussed. The spectrometer will be used for solid-state investigations on the Kurchatov Synchrotron Radiation Source (KSRS). The main elements of the universal station are described, including the results of the position-sensitive X-ray-detector testing

[en] The paper presents main elements of a dedicated proton synchrotron for hadron therapy. The beam parameters for active scanning of tumours are discussed. The output energy of the beam should be variable in the range 60-220 MeV. The average current of the proton beam is equal to 10 nA. The repetition rate of the accelerator is chosen of 1 Hz to get a spill time for slow extraction of about 500 ms. The timing cycle of the accelerator including the quasi-adiabatic capture process and acceleration is described. The RF gymnastics is utilized to prepare the unbunched beam for slow extraction. The magnetic elements of the ring, compact RF and VCO systems are presented in the paper. The maximum magnet field of the dipole magnet should be 1.2 T and the maximum magnetic field on the pole of the quadrupole lenses should be less than 1 T. The resonator should work on the first harmonic with a frequency from 1.298 MHz till 4.804 MHz. The length of the resonator should be less than 1 m. The maximum voltage on the accelerator gap should be about 2 kV. (orig.)

[en] The description of the stand for research photo-and thermoemission cathodes for an accelerator Linak-800 electronic gun is given. The structure of the equipment and the basic characteristics of the stand are described. The stand allows us to tune the control electronics, calibrate the operating and measuring channels, and debug the software. Introducing the structure of the equipment of the mass spectrometer stand with a leaking sub-system enables us to analyze the gas structure of vacuum volume and to change its structure, depending on the task at hand. Using the stand with a laser with 1064 nm, 532 nm, 355 nm, and 266 nm wavelengths allows us to investigate a wide spectrum of materials for photocathode. The cathode assembly model and the simulation results and their coordination with experimental data are described. Issue characteristics of the impregnated cathode (tungsten with 20% barium, calcium and aluminium oxides) are presented. Data on the research of this cathode as a photocathode (with heating and without it) with a 532 nm wavelength laser are given.

[en] Various readout chain components of the ATLAS liquid argon calorimeters have been exposed to high neutron fluences and γ doses at the irradiation test facility of the IBR-2 reactor of JINR, Dubna. Results of the capacitance and impedance measurements of coaxial cables are presented. Results of peeling tests of PC board samples (carton and copper strips) as a measure of the bonding agent irradiation hardness are also reported

[en] The electron injector (electron gun) is a triode system (cathode-control grid-anode with a second grid 'wall') with a grounded anode and an isolated filament shielded cathode, which is supplied with high-voltage (up to −200 kV) pulse from the thyratron modulator through a pulse transformer. A triode gun is an electron injector with the heated oxide-barium cathode and a controlled startup on the grid cathode-grid node from the microwave lamp GS-34. Starting the grid with adjustable delay to adjust the pulse duration from 40 to 400 ns injected from the cathode beam is made from the starting pulse of the cathode node from the first channel of the synchronizer. From the second channel, the thyratron modulator is launched. As a result of adjustment, a beam 5 mm in diameter with a current pulse of 5 A at a current of focusing solenoid ML1 of 3.1 A, voltage of 200-220 kV and frequency of 25 Hz was obtained.

[en] The full-scale scientific research complex IREN will comprise a 200-MeV linear accelerator LUE-200 with a beam power about 10 kW, a subcritical multiplying target, and beam infrastructure with experimental pavilions, as well as technological, control, safety and service systems. The characteristics of the full-scale complex IREN (integral neutron yield 10¹⁵n/s and pulse width 0.6 μs) will allow it to rank among the best neutron sources of such class GELINA (Belgium) and ORELA (USA). The realization of the project is conducted in several stages. The first stage includes the construction of the LUE-200 linear accelerator and nonmultiplying target. This will make possible to carry out experiments which require precision neutron spectroscopy in the energy range from fractions of eV to hundreds of eV already at the first stage of IREN. The results of the physical start-up of the first stage of IREN facility at the Frank Laboratory of Neutron Physics of the Joint Institute for Nuclear Research are presented. General scheme and current status of the electron linac are described. Achieved parameters are: pulsed electron beam current - 2.0 A; electron energy - 30 MeV; pulse width - 100 ns; repetition rate - 25 Hz; integral neutron yield (3 to 5).10¹⁰ n/s.

[en] The project 'Dubna Electron Synchrotron' (DELSY) is aimed to construct a synchrotron radiation source of the third generation at the Joint Institute for Nuclear Research. The DELSY synchrotron radiation source will be constructed on the base of the accelerator facility of the Institute for Nuclear Physics and High Energy Physics (NIKHEF), Amsterdam, The Netherlands. This accelerator facility consists of a linear electron accelerator Medium Energy Accelerator (MEA) for an electron energy of 700 MeV and the electron storage ring Amsterdam Pulse Stretcher (AmPS) for the maximum electron energy of 900 MeV at a circulating beam current of 200 mA. The DELSY storage ring is supposed to be constructed with the use of the AmPS (PAC, Chicago, 1989) storage ring, the focusing system of which will be essentially modified: the ring circumference will be approximately 1.5 times smaller, the electron energy will be increased up to 1.2 GeV and the focusing strength will be enhanced. These measures will allow one to obtain a beam emittance at least ten times smaller which subsequently increases the synchrotron radiation brilliance by several orders of magnitude. The rigging of the DELSY ring with the insertion devices--the superconducting wiggler with a magnetic field of 10 T and the so-called 'vacuum hybrid miniundulator' is the principal feature of the new synchrotron radiation source. Both devices developed by Budker INP, Novosibirsk, will allow one to enrich the characteristics of DELSY as a synchrotron radiation source, expanding its radiation spectrum in the region of the hard X-rays and increasing its brilliance up to 3x10¹⁸ photons/s/mm²/mrad²/0.1% b.w. Now this facility is being dismounted and transferred to JINR