Measurement of the duration of runaway current pulses using measuring equipment with bandwidths up to 50 GHz

Белоплотов, Д. В.; Тарасенко, В. Ф.; Сорокин, Д. А.; Ripenko, V. S.; Leshchinskaia, Svetlana B.

doi:10.1088/1742-6596/2064/1/012009

Cited by 3 publications

(2 citation statements)

References 11 publications

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“…However, this value corresponds is close to the pulse response of the MSO64B oscilloscope (8 GHz, 20 GS s −1 ). Measurements carried out using an oscilloscope with a bandwidth of 50 GHz showed that FWHM of the one can reach 16-28 ps depending on the air pressure and the shape of a cathode [65]. REs are generated at the very beginning of ionizztion processes near the tip, and the pulse duration is limied by the time formation of dense plasma near the tip surface that shield the cathode and decreases the electric field strength.…”

Section: Formation Of Wide Streamers: Experimentsmentioning

confidence: 99%

Formation of wide negative streamers in air and helium: the role of fast electrons

Babaeva¹,

Naidis²,

Терешонок³

et al. 2022

J. Phys. D: Appl. Phys.

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Available experimental data show that the use of voltage pulses with subnanosecond rise times and amplitudes that essentially exceed the breakdown voltage leads to the formation of wide spherical or conical streamers. In this paper, the structure and dynamics of atmospheric pressure wide negative streamers in air and helium by applying high overvoltages with a short rise time to a sharp needle electrode are investigated experimentally and computationally. In the simulations, the two-dimensional fluid and kinetic Electron Monte Carlo Simulation models are used. All the streamers were simulated with the conventional photoionization term Sph that was never turned off. By including an additional source SMC, responsible for the generation of fast electrons, wide and diffuse streamers are obtained. We compare the shapes, width and velocities of conventional streamers in air and helium with those for streamers driven by fast electrons. We show that a conventional streamer in air has a cylindrical form. The conventional streamer in helium is wider than that in air and has a shape of an expanding cone. While accounting for fast electrons, different streamer shapes were obtained. In air, the gap was closed by a spherical streamer. In helium, the shape of a streamer resembles that of a pumpkin. By the application of high (by a factor of four or greater) overvoltages to a sharp needle electrode, the formation of a discharge with several parallel streamers was observed. In this regime, the trajectories of fast electrons originated not only from the cathode, but also from the region of a streamer front where the electric field is high. As a result, the so-called diffuse discharge was formed with high intensity plasma channels surrounded by an aureole of smaller electron density.

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Section: Formation Of Wide Streamers: Experimentsmentioning

confidence: 99%

Formation of wide negative streamers in air and helium: the role of fast electrons

Babaeva¹,

Naidis²,

Терешонок³

et al. 2022

J. Phys. D: Appl. Phys.

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, this value corresponds to the pulse response of the oscilloscope. Measurements carried out using an oscilloscope with a bandwidth of 50 GHz showed that, under similar experimental conditions, FWHM of the one is 16–28 ps depending on the gas pressure and the shape of a cathode [69]. According to the data of other measurements carried out using an oscilloscope with a bandwidth of 59 GHz, FWHM of the RE current pulse can be shorter than 11 ps at voltages higher by almost an order of magnitude [47].…”

Section: Resultsmentioning

confidence: 99%

Positive and negative streamers in air and nitrogen in a sharply inhomogeneous electric field under conditions of runaway electron generation

et al. 2022

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The development of positive and negative streamers in a point‐to‐plane gap filled with air and nitrogen at various pressures (50–200 kPa) and voltages (8–25 kV) was studied. A four‐channel intensified charge‐coupled device (ICCD) and a streak‐camera were used. Electrical parameters were measured with high resolution (10 GHz). An original method of measuring a displacement current caused by a streamer was applied. As was expected, positive streamer branches in nitrogen at low voltages and/or elevated pressures while a large‐diameter streamer is formed in air. However, at high voltages or negative polarity, the large‐diameter streamer is formed both in nitrogen and air in the entire pressure range. It was found that runaway electrons (REs) are generated in the very first picoseconds of gas ionisation near the pointed cathode. It was assumed that REs can be generated near the pointed anode and produce bremsstrahlung radiation due to a sharply inhomogeneous distribution of electrical potential. It was found that in the final stage of negative streamer development in air and nitrogen, the gas between the streamer front and the opposite electrode is ionised almost simultaneously in the entire volume when the streamer diameter is almost equal to the interelectrode gap.

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Formation of a Nanosecond Discharge and Generation of Runaway Electrons When Applying a Voltage Pulse Train

Beloplotov,

Sorokin

2024

IEEE Trans. Plasma Sci.

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Measurement of the duration of runaway current pulses using measuring equipment with bandwidths up to 50 GHz

Cited by 3 publications

References 11 publications

Formation of wide negative streamers in air and helium: the role of fast electrons

Formation of wide negative streamers in air and helium: the role of fast electrons

Positive and negative streamers in air and nitrogen in a sharply inhomogeneous electric field under conditions of runaway electron generation

Formation of a Nanosecond Discharge and Generation of Runaway Electrons When Applying a Voltage Pulse Train

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