Anisotropy in hard bremsstrahlung from a high-voltage laboratory simulation of an atmospheric discharge

Агафонов, А. В.; Огинов, А. В.; Родионов, А. А.; Ryabov, V. A.; Шпаков, К. В.

doi:10.1088/1361-6595/ab3c79

Cited by 14 publications

(1 citation statement)

References 45 publications

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“…A model of electronic acceleration with subsequent generation of x-ray quanta due to bremsstrahlung is proposed. In [7], it was discovered for the first time that x-ray bremsstrahlung at a megavolt nanosecond breakdown of atmospheric air is characterized by a sufficiently high directivity (angular divergence ∼10 • ).…”

Section: Introductionmentioning

confidence: 99%

Coherent x-ray radiation induced by high-current breakdown on a ferrite surface

Tilikin¹,

Savinov²,

Pestovskii³

et al. 2022

J. Phys. D: Appl. Phys.

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For the first time observed that at the initial stage of a high-current discharge, a low-divergence short (< 2 ns) electromagnetic pulse is formed over a ferrite surface. The 50% part of this pulse lies in the region of fairly hard x-ray radiation (hν >1 keV) with an energy ∼0.6 mJ and an average power 0.3 MW. The radiation propagates parallel to the surface in the anode direction with the angle divergence < 2°. The high directionality of the radiation in absence of the aperture-limiting devices for the radiation beam and the quadratic dependence of the spatial radiation energy flux density on the working part of the ferrite prism points to the coherent nature of the observed radiation. A possible generation mechanism of the radiation is proposed. It is based on the short-lived magnetization of the unit areas on the ferrite surface by a high-power electromagnetic pulse and subsequent coherent interference of the unit waves irradiated by these areas.

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Section: Introductionmentioning

confidence: 99%

Coherent x-ray radiation induced by high-current breakdown on a ferrite surface

Tilikin¹,

Savinov²,

Pestovskii³

et al. 2022

J. Phys. D: Appl. Phys.

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Temporal correlation between hard x rays and radio emissions in the MHz and GHz frequency ranges generated by a laboratory high-voltage discharge

Parkevich,

Khirianova,

Khirianov

et al. 2023

Journal of Applied Physics

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We investigate the temporal correlation between very-high-frequency (VHF, at frequencies of the order of 10–100 MHz), ultrahigh-frequency (UHF, at frequencies within 1–6 GHz), and x-ray (with photon energies more than 10 keV) emissions, which accompany the development of a high-voltage discharge initiated in a long gap at voltages up to 1 MV. The x-ray and UHF emissions are found to emerge starting approximately from the prepulse current onset observed before the discharge gap breakdown and both gradually decay coming to this instant. The UHF emission spectrum is represented with frequencies up to 6 GHz, with the highest spectral power being achieved within 1–2 GHz. The radio emission power drops sharply at frequencies below 1 GHz and increases closer to 150 MHz with the highest spectral power of VHF radiation being reached within 60–90 MHz. The VHF emission can appear before the discharge current and UHF emission onsets in the form of 100-ns-long prepulses, and its intensity significantly increases as the UHF emission starts. The analysis of the temporal correlation between x rays, VHF, and UHF radiations, discharge current, and voltage waveforms indicates that the generation mechanisms of the discharge electromagnetic radiations are difficult to be interpreted in terms of the developing or colliding streamer concepts.

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Angular anisotropy of hard x rays produced by laboratory atmospheric discharges

Parkevich,

Shpakov,

Baidin

et al. 2024

Journal of Applied Physics

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The temporal, spectral, and angular characteristics of the x-ray emissions (photons with energies within 5–1000 keV) are exhaustively investigated during the discharge formation at voltages up to 1 MV in approximately 55 cm air gaps. The temporal correlations between the x-ray emissions and discharge voltage and current waveforms are established. The evolution of the discharge plasma structures developing in the time periods of the x-ray generation is traced with a nanosecond resolution. Based on statistical data, theoretical analysis, and estimates the regularities in the x-ray emission characteristics are revealed together with their relationship with the ionization processes occurring in the gas-discharge medium. On the basis of the obtained experimental data, the probable x-ray generation mechanisms are discussed. The findings can provide a deeper understanding of the physics behind the sources of hard x rays arising during the development of laboratory and atmospheric discharges.

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Anisotropy in hard bremsstrahlung from a high-voltage laboratory simulation of an atmospheric discharge

Cited by 14 publications

References 45 publications

Coherent x-ray radiation induced by high-current breakdown on a ferrite surface

Coherent x-ray radiation induced by high-current breakdown on a ferrite surface

Temporal correlation between hard x rays and radio emissions in the MHz and GHz frequency ranges generated by a laboratory high-voltage discharge

Angular anisotropy of hard x rays produced by laboratory atmospheric discharges

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