Grigoriy M. Bubnov
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Previous Organizations / Institutes
The organizations / institutes from the scholar's other articles in the past ten years
Research Subjects
Grigoriy M. Bubnov has a total of 82 co-authors. Here are the top co-authors by number of shared publications:
- Vladimir Vladimirovich Parshin
A. V. Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences (IAP RAS), Nizhny Novgorod, Russia
6 shared publications - Evgeny Alexandrovich Serov
Institute of Applied Physics RAS
4 shared publications - Igor I. Zinchenko
A.V. Gaponov-Grekhov Institute of Applied Physics of RAS
4 shared publications V. F. Vdovin
Institute of Applied Physics of the Russian Academy of Sciences, Nizhny Novgorod, Russia
4 shared publicationsV. I. Nosov
Institute of Applied Physics of the Russian Academy of Sciences, Nizhny Novgorod, Russia
4 shared publications- Aleksandra A. Gunbina
V Kotelnikov Institute of Radio Engineering and Electronics RAS Moscow Russia
3 shared publications
Latest Publications
- Open Access
Microwave Receiving System Based on Cryogenic Sensors for the Optical Big Telescope Alt-Azimuth
This article presents the results of evaluating the possibility of conducting radio astronomy studies in the windows of atmospheric transparency ~100, ~230, and ~350 GHz using the optical Big Telescope Alt-Azimuthal (BTA) of the Special Astrophysical Observatory of the Russian Academy of Sciences (SAO RAS). A list of some promising astronomical tasks is proposed. The astroclimat conditions at the BTA site and possible optical, cryogenic, and mechanical interfaces for mounting a superconducting radio receiver at the focus of the optical telescope are considered. As a receiving system, arrays of detectors cooled to ~0.3 K based on the superconductor–insulator–normal metal–insulator–superconductor (SINIS) structure are proposed. The implementation of the project will make it possible to use the BTA site of the SAO RAS not only to solve some astronomical problems (it is possible to consider the implementation of a single observatory, the VLBI (very-long-baseline interferometry) mode in the Suffa, EHT (Event Horizon Telescope), and Millimetron projects), but it will also be used to test various cryogenic detectors in a real observatory.
Open AccessMicrowave Receiving System Based on Cryogenic Sensors for the Optical Big Telescope Alt-Azimuth
This article presents the results of evaluating the possibility of conducting radio astronomy studies in the windows of atmospheric transparency ~100, ~230, and ~350 GHz using the optical Big Telescope Alt-Azimuthal (BTA) of the Special Astrophysical Observatory of the Russian Academy of Sciences (SAO RAS). A list of some promising astronomical tasks is proposed. The astroclimat conditions at the BTA site and possible optical, cryogenic, and mechanical interfaces for mounting a superconducting radio receiver at the focus of the optical telescope are considered. As a receiving system, arrays of detectors cooled to ~0.3 K based on the superconductor–insulator–normal metal–insulator–superconductor (SINIS) structure are proposed. The implementation of the project will make it possible to use the BTA site of the SAO RAS not only to solve some astronomical problems (it is possible to consider the implementation of a single observatory, the VLBI (very-long-baseline interferometry) mode in the Suffa, EHT (Event Horizon Telescope), and Millimetron projects), but it will also be used to test various cryogenic detectors in a real observatory.
- 15 May 2020
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Applied Superconductivity
- Vol. 30 (8) , 1-5
Terahertz Reflectivity of YBa2Cu3O7-δ at Cryogenic Temperatures
Modern space-based telescopes operating in the terahertz spectral range require highly reflecting and cryogenically cooled optics ensuring extremely low noise. The idea of using high-temperature superconductor YBa2Cu3O7-σ as a telescope's mirror coating for providing low dissipation and high reflectivity of the surface for the Subterahertz frequency band has been explored. We are presenting here some results of measurements of the reflection losses in YBa2Cu3O7-σ at cryogenic and room temperatures (4.2 — 300 K) in the frequency band 0.166 — 0.23 THz. High-accuracy measurements of the absolute value of reflectivity have been performed with the help of the resonance technique. The measured reflection losses in the given frequency band were below 1%. For the same frequency range, these values are well above the reflection losses in normal metals such as copper or aluminum, which are normally used to cover mirrors of telescopes. We therefore conclude that the use of high-Tc superconductors YBa2Cu3O7-σ as a highly reflecting coating for the THz telescopes mirror is not advisable.
- 15 May 2020
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Applied Superconductivity
- Vol. 30 (8) , 1-5
Terahertz Reflectivity of YBa2Cu3O7-δ at Cryogenic Temperatures
Modern space-based telescopes operating in the terahertz spectral range require highly reflecting and cryogenically cooled optics ensuring extremely low noise. The idea of using high-temperature superconductor YBa2Cu3O7-σ as a telescope's mirror coating for providing low dissipation and high reflectivity of the surface for the Subterahertz frequency band has been explored. We are presenting here some results of measurements of the reflection losses in YBa2Cu3O7-σ at cryogenic and room temperatures (4.2 — 300 K) in the frequency band 0.166 — 0.23 THz. High-accuracy measurements of the absolute value of reflectivity have been performed with the help of the resonance technique. The measured reflection losses in the given frequency band were below 1%. For the same frequency range, these values are well above the reflection losses in normal metals such as copper or aluminum, which are normally used to cover mirrors of telescopes. We therefore conclude that the use of high-Tc superconductors YBa2Cu3O7-σ as a highly reflecting coating for the THz telescopes mirror is not advisable.
- 1 November 2019
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- p. 1-3
The Suffa project and high capacity channels for deep space communications systems incorporating cryogenic elements
The problem of long-range space communications systems with high-capacity channels is topical due to a series of deep space projects being currently implemented, such as international missions Exo-Mars and Millimetron. To maximize the rate of the data transfer in space communications systems, antennas with maximum available dimensions are used to provide reasonable capacity. We are offering an approach to increase the capacity of data transfer channels by use of a combination of a large antenna and wide-bandwidth, high-capacity, low-noise, high-frequency cryogenic receivers. When the communication is performed in the millimeter waveband the atmospheric propagation becomes the essential limiting factor to the use of the channel. The theoretical estimations of capacity limits under different atmospheric conditions for diverse hardware and the results of experiments are presented.
- 1 November 2019
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- p. 1-3
The Suffa project and high capacity channels for deep space communications systems incorporating cryogenic elements
The problem of long-range space communications systems with high-capacity channels is topical due to a series of deep space projects being currently implemented, such as international missions Exo-Mars and Millimetron. To maximize the rate of the data transfer in space communications systems, antennas with maximum available dimensions are used to provide reasonable capacity. We are offering an approach to increase the capacity of data transfer channels by use of a combination of a large antenna and wide-bandwidth, high-capacity, low-noise, high-frequency cryogenic receivers. When the communication is performed in the millimeter waveband the atmospheric propagation becomes the essential limiting factor to the use of the channel. The theoretical estimations of capacity limits under different atmospheric conditions for diverse hardware and the results of experiments are presented.
- Open Access
- 23 November 2018
- Published by EDP Sciences in EPJ Web of Conferences
- Vol. 195, 09002
Svalbard astroclimate research: expedition and first results
EPJ Web of Conferences, open-access proceedings in physics and astronomy
- 23 November 2018
- Published by EDP Sciences in EPJ Web of Conferences
- Vol. 195, 09002
Open AccessSvalbard astroclimate research: expedition and first results
EPJ Web of Conferences, open-access proceedings in physics and astronomy
- 11 October 2018
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Terahertz Science and Technology
- Vol. 8 (6) , 773-783
New Frontiers in Modern Resonator Spectroscopy
New opportunities due to advancements in the techniques and methods of broadband resonator spectroscopy in the millimeter and submillimeter range (also known as the terahertz region) are considered. An upgraded variant of the spectrometer produced at IAP RAS (Nizhny Novgorod, Russia) possessing a sensitivity to the absorption coefficient of approximately 4 × 10 $^-9$ cm $^-1$ is presented. The spectrometer allows the continuous recording of gas spectra in the 45-500 GHz frequency range (6 waveguide sub-bands) at pressures of 10-1000 Torr. Fully automated spectrum recording within the waveguide sub-band reduces the overall time required for the experiment by almost an order of magnitude. Examples of recording the spectra of oxygen and water vapor resonance lines, as well as of continuum absorption, including the rotationally resolved water dimer spectrum, are presented. It is demonstrated that the uncertainty of measuring the broadening parameter of diagnostic atmospheric lines may be reduced to 0.1%, which meets the stringent present day requirements of remote sensing of the atmosphere. The physically attainable ultimate sensitivity of broadband microwave resonator spectrometers of various types is discussed. Prospects for further development of the spectrometer and its application for solving fundamental and applied problems of spectroscopy are analyzed.- 11 October 2018
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Terahertz Science and Technology
- Vol. 8 (6) , 773-783
New Frontiers in Modern Resonator Spectroscopy
New opportunities due to advancements in the techniques and methods of broadband resonator spectroscopy in the millimeter and submillimeter range (also known as the terahertz region) are considered. An upgraded variant of the spectrometer produced at IAP RAS (Nizhny Novgorod, Russia) possessing a sensitivity to the absorption coefficient of approximately 4 × 10 $^-9$ cm $^-1$ is presented. The spectrometer allows the continuous recording of gas spectra in the 45-500 GHz frequency range (6 waveguide sub-bands) at pressures of 10-1000 Torr. Fully automated spectrum recording within the waveguide sub-band reduces the overall time required for the experiment by almost an order of magnitude. Examples of recording the spectra of oxygen and water vapor resonance lines, as well as of continuum absorption, including the rotationally resolved water dimer spectrum, are presented. It is demonstrated that the uncertainty of measuring the broadening parameter of diagnostic atmospheric lines may be reduced to 0.1%, which meets the stringent present day requirements of remote sensing of the atmosphere. The physically attainable ultimate sensitivity of broadband microwave resonator spectrometers of various types is discussed. Prospects for further development of the spectrometer and its application for solving fundamental and applied problems of spectroscopy are analyzed.- 1 July 2018
- Published by Pleiades Publishing Ltd in Astrophysical Bulletin
- Vol. 73 (3) , 387-392
The Results of Observing the Astroclimate on the Crimean Peninsula in the Shortwave Part of the Millimeter Wavelength Range
We present the results of a study of the astroclimate on the Crimean Peninsula in the vicinity of the UNN Kara-Dag radioastronomical station (located at a height of 105 m above sea level). The...
- 1 July 2018
- Published by Pleiades Publishing Ltd in Astrophysical Bulletin
- Vol. 73 (3) , 387-392
The Results of Observing the Astroclimate on the Crimean Peninsula in the Shortwave Part of the Millimeter Wavelength Range
We present the results of a study of the astroclimate on the Crimean Peninsula in the vicinity of the UNN Kara-Dag radioastronomical station (located at a height of 105 m above sea level). The...
- Open Access
- 4 August 2017
- Published by EDP Sciences in EPJ Web of Conferences
- Vol. 149
Data rates of SubTHz wireless telecommunication channels
- 4 August 2017
- Published by EDP Sciences in EPJ Web of Conferences
- Vol. 149
Open AccessData rates of SubTHz wireless telecommunication channels
- 1 January 2017
- Published by Springer Nature in Radiophysics and Quantum Electronics
- Vol. 59 (8-9) , 763-771
The Results of Astroclimate Observations in the Short-Wave Length Interval of the Millimeter-Wave Range on the Suffa Plateau
- 1 January 2017
- Published by Springer Nature in Radiophysics and Quantum Electronics
- Vol. 59 (8-9) , 763-771
The Results of Astroclimate Observations in the Short-Wave Length Interval of the Millimeter-Wave Range on the Suffa Plateau
- 29 September 2016
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Microwave Theory and Techniques
- Vol. 64 (11) , 3828-3838
Reflectivity of Metals in the Millimeter Wavelength Range at Cryogenic Temperatures
We present the results of theoretical and experimental studies of the reflectivity of metals at cryogenic temperatures in the millimeter wavelength range. High-Q Fabry-Perot resonators operated at a temperature of 4-300 K in the frequency range 150-250 GHz are used for the experimental study. Silver, copper, gold, aluminum, and beryllium reflectors with different structures are examined. It has been shown that the reflection loss at cryogenic temperatures varies considerably (several times) depending on the structure of the sample surface and the presence of impurities. The obtained data make it possible to calculate the thermal noise of cooled reflectors of the antenna systems in millimeter and submillimeter telescopes.
- 29 September 2016
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Microwave Theory and Techniques
- Vol. 64 (11) , 3828-3838
Reflectivity of Metals in the Millimeter Wavelength Range at Cryogenic Temperatures
We present the results of theoretical and experimental studies of the reflectivity of metals at cryogenic temperatures in the millimeter wavelength range. High-Q Fabry-Perot resonators operated at a temperature of 4-300 K in the frequency range 150-250 GHz are used for the experimental study. Silver, copper, gold, aluminum, and beryllium reflectors with different structures are examined. It has been shown that the reflection loss at cryogenic temperatures varies considerably (several times) depending on the structure of the sample surface and the presence of impurities. The obtained data make it possible to calculate the thermal noise of cooled reflectors of the antenna systems in millimeter and submillimeter telescopes.