In Budker Institute of Nuclear Physics SB RAS the magnetic elements of transfer channel for charged particle beams from SIS18 to SIS100 (FAIR, Germany) [1] were developed. The article presents a description of the quadrupole magnet Q² and serial magnetic measurements results. Magnetic measurements with application of rotating harmonic coil and moving carriage with linear array of Hall sensors were taken. Quadrupole lenses provide magnetic field integral gradient with high quality (<5·10^-3) and satisfy the requirements. High order harmonics are present in the magnetic field due to manufacturing and assembly errors and can imperfect on beam dynamics. Main attention was considered to the third (sextupole) harmonic amplitude, determinate the chromatic properties of the lens. It allows select manufactured magnets to distortion value and minimize imperfection of beam dynamics by optimal theirs arrangement.

An end-to-end simulation of the beam dynamics in the system of extraction, beam transportation and the first section of the accelerator (RFQ) is carried out. The proposed method of modeling the dynamics of ions from the source to the exit from the RFQ made it possible to quickly and efficiently change the parameters of the matching system depending on the final results of the beam passing into the RFQ. A system for matching a beam of negative hydrogen ions has been developed and optimized, which makes it possible to rotate the beam to block the propagation of cesium into the accelerator channel and to match the beam with RFQ. As a result of optimization of the matching channel, it is possible to obtain an emittance increase in RFQ of no more than 25 % for 90 % of the beam fraction, while the capture of beam particles in the acceleration mode is 98 % of the injected beam. The increased drifts in the matching system leave enough space for the placement of diagnostic equipment, a vacuum system and a beam correction system. The dependence of the beam dynamics in the RFQ on the charge distribution over the beam cross section at the output of the matching channel is established.

The LINAK-200 linear accelerator at the JINR Nuclear Power Plant is being built to provide electronic test beams with an energy of up to 200 MeV for research and development in the field of particle detectors, to study advanced methods for diagnosing electron beams and to work as an irradiation unit for applied research. Although the LINAK-200 uses MEA accelerator equipment (NIKHEF), the vacuum system has been significantly upgraded. This paper presents the design and condition of the new vacuum system.

U400M isochronous cyclotron was create on the base of U300 classic cyclotron and is under operation at FLNR, JINR since 1996. U400M cyclotron is intended for accelerating the ion beams with A/Z= 2.286 – 9 to energy W = 80 – 6 MeV/nucl. Cyclotron have H-type main magnet with 4-meter pole diameter and 4 pairs of spiral type sectors. In 2022 year, the reconstruction of cyclotron magnetic structure was held on. The reconstruction included the replacement of magnet main coil, mapping and correction of cyclotron magnetic field. In the frame of the mapping, the magnetic field was corrected to improve its average radial distribution and to compensate the first harmonic. For cyclotron magnetic field mapping the automatic measurement system, based on 14 Hall probes, was used.

Increasing requirements for modern acceleration complexes require precise data on ion beams injected into the accelerator. This paper presents a system of ion beam diagnostics that implements the four-slit method and makes it possible to measure the beam current density distribution in the four-dimensional phase space (PS) with high precision. Technical solutions and design features aimed at obtaining the design parameters of the system are described: the range of investigated beam currents from 1 pA to 20 mA with energy up to 50 keV, spatial resolution from 6 mm to 50 μm.

One of the main problems for beam diagnostics in the projected linear proton accelerator for the DARIA compact neutron source is the high pulse and average beam power combined with a relatively low energy, that significantly limits the choice of possible diagnostic instruments and methods. For basic beam current measurements and tuning procedures in the low-energy part of the accelerator, a wide-aperture water-cooled Faraday cup was developed. This paper presents design features, estimations of thermal loads during typical operation and experimental results of the cup tests at a high-intensity proton beam, also the design features of such devices are described, considering the influence of the beam space charge on the measurement results.

CCD cameras are easy to use and are quite widespread in the optical diagnostics of beams in particle accelerators. The exposure time of these cameras is milliseconds, so they are usually used in a cumulative mode to monitor the circulating beams. The images from the cameras contain information about the transverse distribution of particles in the beam and the position of the center of mass of the beam. In this paper, using the example of CCD cameras installed on the electron-positron collider VEPP-2000, the possibility of their use in the mode of a single beam flight through the observation site is investigated. The intensity of the luminous flux of the optical part of the synchrotron radiation spectrum of the beam was estimated and an image of the transverse distribution of particles in the beam in a single-span mode was experimentally obtained, which confirms the potential for expanding the scope of this diagnostic system. A trial signal processing was done as a demonstration of the determination of the beam parameters by the method under study.

The BNCT method is considered one of the promising methods of external beam therapy in the treatment of radioresistant tumors such as glioblastoma, melanoma and others, which selectively destroy cancer cells due to previous accumulations of boron-10 isotopes stable inside them, and subsequent irradiation with epithermal neutrons. As a result of neutron capture by boron, nuclear radiation interacts with the release of a large amount of energy (charged particles with a high linear energy transfer), which leads to the destruction of the cancer cell. This method is distinguished by a short number of treatment sessions compared to traditional radiation therapy (photons and electrons). In this study, the boron dose rate and the dose rate of gamma radiation in air and in a water phantom are measured using a small-sized neutron detector with a pair of cast polystyrene scintillators, one of which is enriched with boron, developed at BINP. Two neutron beam shaping assembly were used, one with a magnesium fluoride crystal moderator and the other with a Plexiglas moderator. The article will present the experimental results, discuss the features of the neutron beam shaping assembly and formulate recommendations for conducting clinical trials of the BNCT technique

The work reports the achievement of an energy content of 10 J per microsecond pulse in a directed flux of electromagnetic radiation in the frequency range of ~ 0.2–0.3 THz. The flux is generated by a fundamentally new method, which is realized through the pumping of upper-hybrid plasma oscillations in a magnetized plasma column with a relativistic electron beam (REB) and their subsequent transformation into a flux of electromagnetic radiation. In the described experiments at the GOL-PET facility, this method to generate THz radiation is implemented in the following way a beam of electrons with energy E ~ 0.5 MeV with a current density of (1–2) kA/cm2 is passing through a magnetized (4 T) plasma column with a density of 1014–1015 cm–3. By comparing the experimentally measured spectral composition of the radiation flux with the calculated spectrum, it is proved that this process is realized through resonant pumping of the branch of upper-hybrid plasma waves by such beam. A coordinated increase in plasma density and beam current density opens up the prospect of advancement in the generation of multi-megawatt radiation fluxes in the region of one terahertz.

Monolayer triangular WS₂ and MoS₂ islands grown by chemical vapor deposition was investigated by near-field photoluminescence (nano-PL) enhanced by the metallized atomic force microscope (AFM) tip. To achieve maximum near-field response from WS₂ and MoS₂ materials fabricated Au and Ag metallized AFM tips were used. Maximum nano-PL responds from the islands is observed under the resonant conditions when the energy of the localized surface plasmon of the metallized probe coincides with the energy of the exciton luminescence of the WS₂ and MoS₂ materials. Nano-PL mapping of the exciton response allows visualizing structural defects and determine the local thickness changes of monolayer islands with nanometer spatial resolution.