Propagation of an Ultrawideband Electromagnetic Pulse Along a Plasma-Filled Coaxial Line

Es'kin, Vasiliy A.; Korobkov, S. V.; Gushchin, M. E.; Kudrin, Alexander V.

doi:10.1109/tps.2022.3232559

Cited by 2 publications

(4 citation statements)

References 21 publications

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“…The objective and the main result of this work are the demonstration of UWB EMP form distortion effects in laboratory magnetized plasma under the conditions of limited simulation of nano-and microsecond EMP propagation in the ionosphere of the Earth. The effects observed should be interpreted quantitatively and qualitatively in future works based on the models developed for the modes of coaxial magnetized plasma waveguides [24] and finite-difference time-domain (FDTD) simulation [21].…”

Section: Discussionmentioning

confidence: 99%

“…The paper gives a clear picture of the transformation of the shape and spectrum of UWB EMPs in plasma, magnetized or not, in a wide range of electron densities, for all possible ratios of frequencies of the EMP spectrum, plasma, and electron cyclotron frequencies. On the one hand, the article develops the previously obtained results for isotropic plasma, calculated [4,5,17,21] and experimental [16,17,20], for the case of magnetized plasma. On the other hand, it develops previously obtained results on excitation of the response of a dense magnetized plasma [22] for the case of a shorter pulse that excites not only low-frequency whistler waves but also high-frequency electromagnetic waves.…”

Section: Discussionmentioning

confidence: 99%

“…When excited in the fundamental (transverse electromagnetic, TEM) mode, the transmitting line (in particular, coaxial line) has constant impedance characteristics in a wide frequency band, up to the zero frequency (dc). As a result, one can achieve the quasiunidimensional propagation of the EMP, which can be described using the TEC concept, both in the case of isotropic plasma [20,21] and in the presence of an ambient magnetic field. TEC can be regarded as the scaling parameter when simulating the dispersion EMP distortion in the ionosphere [4].…”

Section: Discussionmentioning

confidence: 99%

“…Today, this is the only instrument of its kind that makes it possible to experimentally study linear and nonlinear effects in plasma during the passage of a UWB EMP along a path with a total length of about 10 m. The preliminary experimental results obtained by using the GCL were published in [20]. These results are qualified as linear dispersion distortions of the UWB EMP shape in a line filled with an isotropic (unmagnetized) plasma, which were also studied analytically and by the methods of numerical FDTD simulation [21].…”

Section: Introductionmentioning

confidence: 99%

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Transformation of the Shape and Spectrum of an Ultrawideband Electromagnetic Pulse in a “Gigantic” Coaxial Line Filled with Magnetized Plasma

Zudin,

Gushchin,

Korobkov

et al. 2024

Applied Sciences

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A propagation of ultrawideband electromagnetic pulses (UWB EMPs) through magnetized plasma has been experimentally studied using a “gigantic” coaxial line, which has been developed at IAP RAS for laboratory modeling of ionospheric effects. This coaxial line is 1.4 m in diameter and 10 m in length and is installed inside the chamber of the large-scale Krot plasma device. The line can be filled with rf inductively coupled plasma, magnetized or not. It allows one to explore the propagation of UWB EMPs in plasma along a long path without refraction and divergence and obtain a physical picture of EMP transformation. Under conditions where the duration of the UWB EMP is comparable to the period of electron plasma oscillations (fp−1), the period of cyclotron rotation of electrons (fc−1), or even significantly shorter, a complex of effects of transformation of the waveform and frequency spectrum of the pulse occurs. Without ambient magnetic field, a UWB EMP is distorted due to the effects of the cutoff and frequency dispersion. In dense magnetized plasma, i.e., when fp >> fc, the UWB EMP breaks into two wave packets, the high-frequency one (f > fp) and low-frequency one (f < fc). In rare magnetized plasma (fp << fc), the cyclotron absorption produces a long train of damped oscillations at a frequency close to the cyclotron frequency fc following the UWB EMP.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Transformation of the Shape and Spectrum of an Ultrawideband Electromagnetic Pulse in a “Gigantic” Coaxial Line Filled with Magnetized Plasma

Zudin,

Gushchin,

Korobkov

et al. 2024

Applied Sciences

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Surface aging condition monitoring of glass insulators in substations based on laser transmission spectroscopy

Liu,

Liang,

Liang

et al. 2024

Appl. Opt.

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The aging of glass insulator materials in substations leads to a decrease in the overall insulating performance of insulators, which affects the safety of power system operation. In order to effectively and accurately detect the aging condition of the glass insulator surface in a substation, a technical method based on laser transmission spectroscopy is proposed to characterize the aging state of glass insulators. During the application of laser transmission spectroscopy, a high-frequency laser is used as the incident light source, and the refractive index and the corresponding deflection angle are calculated during the analysis of the high-frequency laser’s vertically incident optical path; the electromagnetic wave theory is integrated to calculate the sample’s absorption coefficient, transmittance, reflectance, signal time delay, and other relevant optical parameters so that non-destructive testing of the glass insulator can be carried out. Experiments were carried out on glass insulator specimens with different aging degrees, and the corresponding relationships between different aging degrees of glass insulator media, absorption coefficients, and signal time delays were obtained by analyzing the laser transmission spectra of the specimens and integrating the time-domain spectral analysis. The test results show that there are obvious differences in the absorption characteristics of glass insulators with different aging degrees in the high-frequency laser band, and the longer the aging time is, the more obvious the absorption characteristics are and the larger the corresponding absorption coefficients are.

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Propagation of an Ultrawideband Electromagnetic Pulse Along a Plasma-Filled Coaxial Line

Cited by 2 publications

References 21 publications

Transformation of the Shape and Spectrum of an Ultrawideband Electromagnetic Pulse in a “Gigantic” Coaxial Line Filled with Magnetized Plasma

Transformation of the Shape and Spectrum of an Ultrawideband Electromagnetic Pulse in a “Gigantic” Coaxial Line Filled with Magnetized Plasma

Surface aging condition monitoring of glass insulators in substations based on laser transmission spectroscopy

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