erratum

Abstract— The issues of designing pulse-wave fiber-optic sensors are considered. Particular emphasis is placed both on the design of mechanical sensing elements and improvement of a fiber-optic channel, which largely determines the resolution and parametric reliability of the entire sensor, The use of a matrix of contact pads instead of a single sensitive point has made it possible to resolve the problem

Abstract A digital thermometer is described in which the use of a modified null method has significantly reduced the impact of changes in the gain of the measuring path on the measurement accuracy. Autoregulation of the zero balance in the thermometer is performed using two types of pulse modulation: amplitude and pulse-width. For a 12-bit digital output code and a measurement resolution of 0.037°С

Abstract— A chronographic image converter camera has been designed on the basis of a PIF-01 image converter tube to obtain spatial and temporal information in a study of light processes in the nano- and microsecond ranges. The duration of scans on a 25-mm-diameter screen of the camera can be varied from 0.5 to 10 µs with a limiting time resolution of 2 ns or better. Possible applications of the developed

Abstract—A method for measuring the concentration of Cr3+ ions is considered in ruby single crystals (Al2O3 : Cr3+) using X-ray fluorescence analysis. The laboratory energy dispersive spectrometer was calibrated using the external standard method for quantitative measurements. In constructing the calibration dependence, we used a series of test samples of ruby crystals in which the concentration of

Abstract—The results of experimental studies are presented on the spectral composition of pulsed X-ray radiation and electron emission of a micropinch plasma in a wide 1–300 keV energy range. Studies were conducted on a “low inductive vacuum spark” apparatus at various discharge currents. The results we obtained make it possible to determine the effect of the discharge current on the spectral composition

Abstract—This paper describes the design and parameters of a nanosecond accelerator with an additional transmission line that has variable wave impedance and a gas-filled diode. The possibility of controlling the beam current parameters by changing the air pressure in the diode is shown. Behind the anode foil, at a half-maximum pulse width of ≈1.3 ns and an electron energy of up to 350 keV, the beam

Abstract— The use of a special device that limits the field of view of a detector, i.e., a confocal collimator, is one of the approaches to obtaining information about the spatial distribution of the detected material in the methods for radionuclide diagnostics (in medicine) and X-ray fluorescence analysis (in material science). This device is a monolithic construction with a large number of straight

Abstract— Diagnostics have been developed for measuring the efficiency of stripping a beam of negative ions in a gas stripping target of a tandem charged particle accelerator. The coefficient of ion-electron emission during the bombardment of copper by protons with an energy of 1 MeV was measured. A bending magnet with a horizontal nozzle was installed, which made it possible to place a Faraday cup

Abstract—An apparatus for the manufacture of optical dielectric quartz glass microresonators using the thermal method is described. One distinctive feature of this apparatus is the ability to automatically manufacture resonators with a given diameter and deviation between the plane of the tangent to the equator of the resonator and the axial line of the legs. The results of comparing “manual” and mechanized

Abstract The results of an experimental study of the characteristics of a plasma-erosion opening switch, which is designed for operation in discharge circuits with inductive energy storing, are presented. The time dependences of the resistance of the opening switch, whose jump reaches 3 Ω, as well as the overvoltage that reaches 60 kV at an initial voltage at the main capacity of 30 kV, were determined

Abstract—A method for adjusting an unstable confocal resonator and determining its axis direction using an angular reflector is proposed. A semiconductor laser was used as an auxiliary laser, which set the direction of the cavity axis. A collimator was used as the device that controls tuning. A corner reflector mounted inside the resonator from the side of the concave mirror made it possible to create

Abstract—This article discusses the results of parallel measurements with two-coordinate position-sensitive He3 detectors with a delay line, which are installed on REFLEX and GRAINS neutron spectrometers of the IBR-2 pulsed reactor with the simultaneous use of three data acquisition systems: DeLiDAQ-1, DeLiDAQ-2, and a system based on the N6730 digitizer produced by CAEN.

Abstract—Improved methods and devices for nondestructive control of the degree of unipolarity of large LiNbO3 crystals are described. These methods are based on measurements of the static and dynamic piezoelectric characteristics of crystals and are applicable to other ferroelectric materials. These methods allow assessment of the degree of unipolarity and the relative volume of antiparallel domains

Abstract—This paper presents a description of the new CARPET facility for detecting the charged component of cosmic rays, as well as its technical characteristics; it was designed and installed at the Dolgoprudny Scientific Station of the Lebedev Physical Institute (DNS of the Lebedev Physical Institute). The detecting base of the CARPET facility consists of STS-6 gas-discharge counters combined in

Abstract— A “non-contact” method for measuring the emittance of a corpuscular flow extracted from the Penning ion source of a small linear charged-particle accelerator has been developed and tested. The emittance is calculated by minimizing the difference between the theoretically calculated and experimentally measured beam sizes in the ion-optical system of the accelerator. The dimensions are measured

Abstract The principles and results of the development of an electron spectrometer for a facility for the laser acceleration of electrons, which is being created at the Institute of Laser Physics, Siberian Branch, Russian Academy of Sciences, jointly with the Institute of Nuclear Physics (BINP), Siberian Branch, Russian Academy of Sciences, are described. The spectrometer uses a permanent dipole magnet

Abstract A method and acoustic sounding hardware complex for studying the acoustic characteristics of the upper layer of the sea with the use of broadband highly directional inverted radiators, which are installed on the bottom, are described. The method is based on the principle of registering backscattering and reflection of acoustic pulses of different frequencies from the water surface, thus allowing

Abstract— The design of an inlet vacuum window, which was developed and manufactured as part of the project of a target station for the production of medical radionuclides, is presented. The calculated data of temperature fields and thermomechanical stresses in the window elements are presented, as well as data on the stress–strain state of the window under the action of the total load (pressure plus

Abstract—An informative and very clear experimental method for studying the processes that accompany the propagation of shock waves in transparent materials under powerful pulsed exposure is proposed. The method is based on analysis of the shadow streak image formed by probe laser radiation that passes through a sample. The sensitivity of the method is estimated. The method was tested on samples of

Abstract— A cold-loaded cryostat was designed to measure the optical spectra of thermally unstable samples. The temperature stabilization system with a resistive heater provides temperature control in the range of 80–270 K with an accuracy of ±0.3 K. The cryostat was used to measure the Raman spectra of molecular hydrides of silica glass at different temperatures.

Abstract– The use of scintillators of micron thickness attached to the input windows of photomultiplier tubes (PMTs) makes it possible to create ion detectors with low sensitivity to neutrons and gamma rays. The manufacturing technology of such detectors based on the CsI(Tl) scintillator and Hamamatsu H8500D multianode PMT is described. The main steps of the process are considered, including vacuum

Abstract— The results of a study of the characteristics of a thick gas electron multiplier based on a fiberglass plate with a 0.8–2.0-mm-thick double-sided copper coating in which 1 mm holes were drilled at a spacing of 1.5 mm are presented. The gas filling of the multiplier is a mixture of Ar + 5% isobutane. The energy resolution for the 55Fe line is 21%, the spatial resolution is 0.7 mm, the temporal

Abstract—An apparatus for selective laser sintering of micron and submicron fraction powders is described. The apparatus allows studies with small volumes of polymer powders, as well as aqueous and alcoholic suspensions to refine the sintering process in order to achieve high spatial resolution (on the order of 10 μm). Thin (approximately 20 μm) layers of spherical microparticles of polymethylmethacrylate

Abstract— A 14 MeV neutron flux monitor has been designed to configure the NG-12I neutron generator in pulsed mode and measure the relative 14-MeV neutron flux. The principle of operation of the pulsed channel of the neutron generator NG-12I is considered. The structural diagram of the monitor is given and the principle of its operation is described. The monitor allows real-time monitoring of the relative

Abstract— The results of the development of an activation technique for measuring the DD-neutron yield based on the 115In(n, n′)115mIn reaction and its application in experiments on the inertial thermonuclear synthesis at the Iskra-5 laser facility are presented. The relative error of measurements at an integral yield of pulsed neutron radiation of approximately 108 neutrons was 35%. The experimental

Abstract—This article presents the results of an experiment on the processes of scattering of ions and neutral atoms on targets from polished tungsten obtained using a neutral particle facility. The neutral particle facility is a laboratory instrument designed to study the processes of reflection and scattering of charged particles and neutral atoms on the surfaces of targets made of various materials

Abstract—The features of acousto-optic interaction are considered for the case where the duration of an acoustic pulse is much shorter than the time of crossing an optical beam by an elastic wave packet. It is shown that under these conditions the acoustic wave packet turns into a scanning element, which extracts information about the energy-geometric parameters of the cross section of the laser beam

A fundamental approach is considered and an effective source of a spatially homogeneous volumetric nonequilibrium plasma based on a glow discharge at atmospheric pressure generated in an inhomogeneous electric field is developed. The main advantages of this discharge were revealed: high combustion uniformity, economy, and the possibility of scaling the structure over a wide range, while increasing

Abstract—A wide-aperture low-energy electron accelerator based on a high-voltage glow discharge (HVGD) is considered in comparison with accelerators based on a number of longitudinal filaments. The basic design features and advantages of HVGD-based accelerators are presented. These studies showed that it is possible to obtain high values of the density of the electron beam current extracted from the

Abstract—A generator of powerful quasi-rectangular high-voltage pulses based on an N-section adder was created from segments of coaxial lines with a common insulating magnetic circuit. For a matched load, the adder provides an N-fold increase in the voltage amplitude relative to the amplitude of the input pulses with the rise and fall times of the output pulses determined by the relations: 2(N – 1)τs+

Abstract— A 32-channel 12-bit ADC-32ATC analog-to-digital conversion module with signal shape digitization at 40 MHz, which was been developed for the VES experiment at the U-70 accelerator, is presented. The analog shapers for this module, the measurement methods, the data-processing techniques, and the experience gained in using this module in the VES experiment are described. The module is intended

Abstract The possibility of reducing the rated power of filter capacitors, i.e., the ratio of the product of the effective values of the voltage and current of a capacitor to the power of the DC–DC converter load, is shown. A DC–DC converter of the step-down type with a power of 40 W was used for this experimental study. A mathematical model was developed and a study of the change in the rated power

Abstract— A passive neutron dosemeter (PND) for high-energy accelerators is described. The slide of the DVGN-01 personal dosemeter, which is placed at the center of a polyethylene moderator, is used as a thermal-neutron detector. The moderator includes a lead insert, which increases the sensitivity of the dosemeter to high-energy neutrons, and a cadmium filter. Optimization calculations of the dosemeter

Abstract—A the high-voltage divider for pulsed signals was developed for multichannel DAQ-system of the LIA-20 linear induction accelerator. The divider satisfies a range of requirements: a range of operating voltages up to 30 kV, a 30 MHz bandwidth, accuracy and stability characteristics that are better than 1%, and repeatability of its parameters during mass production. An analysis of various variants

Abstract— A system for rotating nonmonochromatic electron beams consisting of two identical magnetic mirrors, is described. The distribution of the magnetic field along the depth of the mirrors is formed in such a way that an increase in the magnetic field at the entrance to the mirror follows its decline according to a certain law. As a result, it is possible to compensate for the angular divergences

Abstract—An EKOS compact electronic spectrometer is described, which has been designed for simultaneous (below, this means the simultaneous accumulation of electron counts with various parameters) registration of solar wind electrons in a relatively wide energy range. Computer simulation of the electronic optics scheme of the instrument made it possible to obtain the following analytical characteristics:

Abstract The models and results of the experimental studies of the characteristics of objects that are new for domestic instrumentation are presented: an X-ray mirror system and a CdTe strip semiconductor detector that are used in the first Russian ART-XC reflecting X-ray telescope. This telescope is a part of the Spektr-RG international space observatory, which started to the L2 libration point in

Abstract Remote monitoring with alerting systems becomes unavoidable in the field of remote healthcare. The efficiency of such a system depends on accuracy, easy-to-use, versatility, and cost-effectiveness. In this study, a remote cardiac health monitoring along with the alert raising facility is presented. Special design techniques have been adopted to craft the photoplethysmography (PPG) sensor to

Abstract— The design of individual elements of an improved system for laser fluorescence spectroscopy in vivo is described. The proposed technical solutions, in particular, the inclusion of a white light source in the system and the special design of the fiber optic probe and filter unit allow elimination of a number of drawbacks of the existing systems. In the described system, the diffuse reflection

Abstract— A dual-slit dissector operating in the crossed-sweep mode with a picosecond time resolution has been created on the basis of the PIF-01 image converter tube. The dissector is applicable to synchrotron radiation sources and electron-positron colliders when it is necessary to simultaneously record longitudinal profiles of multi-bunch beams that fill two to several hundred adjacent separatrices

Abstract A current collector with a solid-state discharger for 268 input and the same number of outgoing RK-50-9 RF cables from a high-voltage capacitive storage to the load is described. The spark discharger is started using a special initiator. The discharger design has a number of elements that reduce the self-inductance of the spark gap to 50 nH and increases the reliability of its operation via

A composition and method for applying a hydrophobic protective coating on the radiation input surface of CsI(Tl) crystals is proposed. The coating is a composition of polymer (fluoroplastic varnish) and solvent (ethyl acetate). The optimal composition of the coating composition with a thickness of ~2 µm was determined. The method of application involves the preliminary exposure of the sample in pairs

Abstract— A spectrometer based on a Si(Li) detector has been tested by exposure to α particles with the aim of determining changes in the detector characteristics versus the fluence. As a result of 60-day measurements with a total fluence of 6.2 × 109 α particles, it has been established that the dependence of the deterioration in the energy resolution of α-particle peaks on the fluence is described

Abstract The results of the development of a low-power high-voltage amplifier for creating an analyzer of the current–voltage characteristics of high-resistance semiconductor and crystal structures are presented. The output voltage ranges are 0–500 V and 0 to ± 250 V in unipolar and bipolar modes, respectively, the load current is up to 5 mA, and the pulse rise time is 10 µs. The power source (300

Abstract— The methodology and results of absolute dee voltage measurements using the X-ray spectrum method at the FLNR JINR cyclotrons are presented. An Amptek XR-100T-CdTe semiconductor detector was used to measure bremsstrahlung spectra. The technique was tested on the U-400M isochronous cyclotron and was used to adjust the high-frequency accelerating system to the operating mode during commissioning

Abstract A magneto-armored system for a new generation of technological complexes based on CW K-band gyrotrons (28–50 GHz), which operate on the main cyclotron resonance with an output power of 25–30 kW or higher, was developed and experimentally tested. The possibility of creating a homogeneous (better than 0.5%) sector of the magnetic field in the region of the electron–wave interaction with a length

Abstract— An experimental apparatus was developed and manufactured to simulate the processes of electric spark plasma sintering. The apparatus allows direct observation and high-speed video recording of chains of powder particles in the channels of a dielectric matrix when passing short pulses of electric current. Tests performed using chains of titanium spherical particles with a diameter of up to

Abstract A new approach to determining the size of the focal spot of a microfocal source of hard radiation is presented. The approach is based on the analysis of an X-ray image of 13-μm-thick tantalum foil oriented along the cone axis of the hard radiation of a microfocus source. The experimental results obtained using a new microfocus source of bremsstrahlung created on the basis of an 18-MeV betatron

Abstract The interpolator is designed to determine the maximum signal amplitude in the analog channel of a readout ASIC. The use of an interpolator allows to mitigate the requirements for the sampling frequency of an analog-to-digital converter built into the channel of the readout ASIC. Design process and test results of an interpolator unit implemented by means of a FPGA are described.

Abstract A small generator of high-power high voltage nanosecond pulses with a 12 V power source is considered. At a load of 75 Ω, it provides the generation of pulses with an amplitude of ~17 kV, a front of ~4 ns, and an energy of ~15 mJ. The maximum pulse repetition rate is 15 kHz. The generator contains an inductive energy storage device and a capacitive storage device with an operating voltage

Abstract A highly stable and highly efficient electroexplosive device for initiating powerful shock waves that contained a detonator based on a narrow copper foil coated with a polymer film and a semiconductor generator of submicrosecond current pulses that provides an electric explosion of the foil in a time of ~70 ns are considered. The possibility of using the developed device for detonating powerful

Abstract— A Vikhr plasma-beam device of the Dense Plasma Focus (DPF) type with an energy of ~5 kJ has been recently put into operation at the Baikov Institute of Metallurgy and Material Science. The device, the design of its components, and its parameters are described. The physical processes that occur in the DPF working chamber during generation of beams of fast electrons, ions, cumulative jets of

Abstract— An experimental complex is described for conducting high-performance screening of the functional characteristics of photoluminescent chemosensor materials (CSMs) intended for determining volatile organic compounds in the gas phase and optimizing the characteristics of matrix sensors based on CSMs in multicomponent vapor-gas mixtures. The complex combines a system for the continuous generation

Abstract— The application of computational methods to correct distortions in spectral-domain optical coherence tomography due to fast probe movements relative to a studied object is described. This technique is intended for use in endoscopy or in the study of external biological tissues using a handheld probe. The effectiveness of the method was confirmed experimentally.

A method is proposed that allows one to provide high-performance acousto-optic (AO) Bragg diffraction of two-color optical radiation at the highest possible frequency of a sound wave. The method is based on the use of AO cells together with a prism, with which two-color radiation is diluted at the required angle. The method is demonstrated based on the example of AO diffraction of a two-color Ar-laser

Abstract— A computer model of a bremsstrahlung source based on a 4-MeV betatron has been corrected upon measuring the focal spot using a new version of the slit-collimator method. Based on this model, an analysis of possible sources of an error in measuring the focal spot is performed, thus providing the reliability of experimental results.

Abstract— A neutron detection system at the HELIS setup created by the Lebedev Physical Institute is based on proportional counters. Systems for shaping, discriminating, reading, digitizing, and processing signals from 36 SNM18 proportional neutron counters are. The location of the counters in all directions around the analyzed target made it possible to perform a set of experiments to study the angular

Abstract The causes of fluctuations of the acoustic-impulse propagation velocity in a composite plate upon a change in the distance between the radiation source and a receiving transducer from 30 to 300 mm were studied. Methods for minimizing these fluctuations by reducing the influence of high-frequency wave-packet modes at the time of recording impulses by acoustic-emission transducers were developed

Abstract The results of the development of a high-frequency pumping source for active media on self-terminating transitions in metal vapors, which allows operation in the mode of a low energy deposition into the discharge, are presented. Reduced energy deposition into the discharge is provided due to the pumping of the active medium with short-duration high-voltage pulse (3 kV, 15 А, 40–60 ns). A record-high