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  • A Picosecond Image-Converter Dissector with a Crossed Sweep
    Instrum. Exp. Tech. (IF 0.488) Pub Date : 2020-03-10
    S. V. Andreev, N. S. Vorobiev, V. L. Dorokhov, A. I. Zarovsky, A. S. Komelkov, G. Ya. Kurkin, O. I. Meshkov, A. V. Smirnov

    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

    更新日期:2020-03-20
  • A Solid-State Discharger for a High-Current Energy Source Based on a Capacitive Storage with an Operating Voltage of 50 kV
    Instrum. Exp. Tech. (IF 0.488) Pub Date : 2020-03-10
    A. N. Gusev, A. V. Kozlov, A. V. Shurupov, A. V. Mashtakov, M. A. Shurupov

    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

    更新日期:2020-03-20
  • A Protective Hydrophobic Coating for CsI(Tl) Crystals
    Instrum. Exp. Tech. (IF 0.488) Pub Date : 2020-03-10
    A. L. Shpilinskaya, A. M. Kudin, L. A. Andryushchenko, A. V. Didenko, O. V. Zelenskaya

    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

    更新日期:2020-03-20
  • A Change in the Parameters of Si(Li) Detectors under Exposure to α Particles
    Instrum. Exp. Tech. (IF 0.488) Pub Date : 2020-03-10
    N. V. Bazlov, S. V. Bakhlanov, A. V. Derbin, I. S. Drachnev, G. A. Izegov, I. M. Kotina, V. N. Muratova, N. V. Niyazova, D. A. Semenov, M. V. Trushin, E. V. Unzhakov, E. A. Chmel

    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

    更新日期:2020-03-20
  • A High-Voltage Amplifier
    Instrum. Exp. Tech. (IF 0.488) Pub Date : 2020-03-10
    V. N. Vyukhin

    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

    更新日期:2020-03-20
  • The Methodology and Results of Absolute Dee Voltage Measurements at the Cyclotrons of the FLNR JINR Using the X-Ray Spectrum Method
    Instrum. Exp. Tech. (IF 0.488) Pub Date : 2020-03-10
    A. T. Issatov, Yu. G. Teterev, R. K. Kabytayeva, S. V. Mitrofanov, I. V. Kalagin

    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

    更新日期:2020-03-20
  • A Magneto-Armored Warm-Solenoid Based System for K-Band Gyrodevices
    Instrum. Exp. Tech. (IF 0.488) Pub Date : 2020-03-10
    M. D. Proyavin, V. N. Manuilov, I. G. Gachev, V. V. Maslov, M. V. Morozkin, A. N. Kuftin, E. M. Tai, M. Yu. Glyavin

    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

    更新日期:2020-03-20
  • An Experimental Apparatus for Modeling the Processes of Electric Spark Plasma Sintering
    Instrum. Exp. Tech. (IF 0.488) Pub Date : 2020-03-10
    V. A. Kudryashov, S. M. Godin, S. G. Vadchenko, A. S. Rogachev

    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

    更新日期:2020-03-20
  • Determination of the Size of the Focal Spot of a Microfocus Source of Hard Bremsstrahlung
    Instrum. Exp. Tech. (IF 0.488) Pub Date : 2020-03-10
    M. M. Rychkov, V. V. Kaplin, V. A. Smolyanskii

    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

    更新日期:2020-03-20
  • An Interpolator for Signal Peak Detection in Front-end Electronics
    Instrum. Exp. Tech. (IF 0.488) Pub Date : 2020-03-10
    V. V. Shumikhin, D. A. Azarov, E. V. Atkin, I. S. Bulbakov, P. Yu. Ivanov, D. D. Normanov

    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.

    更新日期:2020-03-20
  • A High Voltage Diode-Transistor Generator of Nanosecond High Voltage Pulses
    Instrum. Exp. Tech. (IF 0.488) Pub Date : 2020-03-10
    S. V. Korotkov, Yu. V. Aristov, A. L. Zhmodikov

    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

    更新日期:2020-03-20
  • A Device for Nanosecond Initiation of Powerful Shock Waves
    Instrum. Exp. Tech. (IF 0.488) Pub Date : 2020-03-10
    S. V. Korotkov, A. A. Toskin, Yu. V. Aristov, D. A. Korotkov

    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

    更新日期:2020-03-20
  • The Vikhr Plasma Focus Device for Diagnosing the Radiation-Thermal Resistance of Materials Intended for Thermonuclear Energy and Aerospace Engineering
    Instrum. Exp. Tech. (IF 0.488) Pub Date : 2020-03-10
    V. A. Gribkov, I. V. Borovitskaya, A. S. Demin, E. V. Morozov, S. A. Maslyaev, V. N. Pimenov, A. V. Golikov, A. K. Dulatov, G. G. Bondarenko, A. I. Gaydar

    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

    更新日期:2020-03-20
  • An Experimental Complex for High-Performance Screening of Photoluminescent Chemosensor Materials
    Instrum. Exp. Tech. (IF 0.488) Pub Date : 2020-03-10
    G. A. Yurasik, D. S. Ionov

    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

    更新日期:2020-03-20
  • Application of Phase Correction for Compensation of Motion Artifacts in Spectral-Domain Optical Coherence Tomography
    Instrum. Exp. Tech. (IF 0.488) Pub Date : 2020-03-10
    S. Yu. Ksenofontov, P. A. Shilyagin, D. A. Terpelov, A. A. Novozhilov, V. M. Gelikonov, G. V. Gelikonov

    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.

    更新日期:2020-03-20
  • Acoustoptic Diffraction of Two-Color Radiation at the Limit Frequency of an Acoustic Wave
    Instrum. Exp. Tech. (IF 0.488) Pub Date : 2020-03-10
    V. M. Kotov, E. V. Kotov

    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

    更新日期:2020-03-20
  • A Study of a Method for Determining the Size of a Bremsstrahlung Focal Spot Using a Slit Collimator
    Instrum. Exp. Tech. (IF 0.488) Pub Date : 2020-03-10
    V. B. Sorokin

    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.

    更新日期:2020-03-20
  • Neutron Detection Using Proportional Counters at the HELIS Setup
    Instrum. Exp. Tech. (IF 0.488) Pub Date : 2020-03-10
    O. D. Dalkarov, M. A. Negodaev, A. S. Rusetskii, A. P. Chubenko, A. L. Shepetov

    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

    更新日期:2020-03-20
  • Error Reduction in Determining the Wave-Packet Speed in Composite Materials
    Instrum. Exp. Tech. (IF 0.488) Pub Date : 2020-03-10
    Yu. G. Matvienko, V. I. Ivanov, I. E. Vasil’ev, D. V. Chernov, I. V. Mishchenko

    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

    更新日期:2020-03-20
  • A High-Frequency Pumping Source for Metal Vapor Active Media
    Instrum. Exp. Tech. (IF 0.488) Pub Date : 2020-03-10
    S. N. Torgaev, D. N. Ogorodnikov, I. S. Musorov, A. E. Kulagin, G. S. Evtushenko

    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

    更新日期:2020-03-20
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