E-beam generation in discharges initiated by voltage pulses with a rise time of 200 ns at an air pressure of 12.5–100 kPa

Тарасенко, В. Ф.; Белоплотов, Д. В.; Ломаев, М. И.; Сорокин, Д. А.

doi:10.1088/2058-6272/ab079b

Cited by 11 publications

(8 citation statements)

References 44 publications

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“…The generators were connected to discharge chambers with centimeter gaps. Figure 1 shows two experimental setups with generators (GIN-55-01, GIN-100-1, GIN-50-1, NPG-15/2000N, NPG-18/2000N and GIN-35NP) rated at an amplitude of tens of kilovolts [68].…”

Section: Experimental Setups and Measuring Techniquesmentioning

confidence: 99%

Runaway electrons in diffuse gas discharges

Тарасенко

2020

Plasma Sources Sci. Technol.

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The paper provides a review of research data showing the role of runaway electrons in gas breakdowns and diffuse discharges in an inhomogeneous electric field at a pressure of 0.01-1.2 MPa. From the data presented the reader can grasp the idea of how such discharges develop at negative and at positive voltage polarity, what setups and conditions are best suited to detect runaway electron beams, and what factors influence their amplitude, duration, and energy. Also analyzed are the streamer mechanisms of diffuse discharges and the generation of runaway electrons in high-pressure gases in an inhomogeneous electric field. The review is supplemented with respective diagrams and with images captured at high resolution to trace the plasma dynamics of nanosecond gas discharges from early prebreakdown stages till their final diffuse appearance.

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Section: Experimental Setups and Measuring Techniquesmentioning

confidence: 99%

Runaway electrons in diffuse gas discharges

Тарасенко

2020

Plasma Sources Sci. Technol.

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“…However, it was found that REs can be generated not only in the prebreakdown stage [36]. The generation of REs can occur after bridging the gap with plasma.…”

Section: Resmentioning

confidence: 99%

“…In recent experimental studies, it was found that REs can be generated not only in the prebreakdown stage of the discharge, but also after breakdown [36] when microsecond voltage pulses with an amplitude of several tens of kilovolts are applied. This indicates that even after filling the discharge gap with plasma, the reduced electric field strength can locally exceed the critical value required for electron runaway.…”

Section: Introductionmentioning

confidence: 99%

Generation of runaway electrons in plasma after a breakdown of a gap with a sharply non-uniform electric field strength distribution

Белоплотов¹,

Тарасенко²,

Shklyaev³

et al. 2021

J. Phys. D: Appl. Phys.

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The paper is devoted to the study of the initiation and formation of a negative streamer in a sharply inhomogeneous electric field and the generation of runaway electrons (REs) in air and helium at atmospheric pressure and below, as well as in sulfur hexafluoride at low pressure. Nanosecond voltage pulses of negative polarity with an amplitude of 18 kV were applied across a point-to-plane gap 8.5 mm long. The studies were carried out using broadband measuring sensors and equipment with picosecond time resolution, as well as using a four-channel ICCD camera. Using a special method for measuring the dynamic displacement current caused by the redistribution of the electric field during streamer formation, the waveforms of voltage, discharge current, RE current, and dynamic displacement current were synchronized to each other, as well as to ICCD images. Data on the generation of REs with respect to the dynamics of streamer formation were obtained. It was found that REs are generated not only during the breakdown of the gap, but also after that. It has been found that the formation time of explosive emission centers affects the generation of REs after breakdown. Based on the measurement data of the voltage, discharge current, and dynamic displacement current, the electron concentration in the plasma channel after breakdown and the electric field strength near the surface of the grounded electrode were calculated.

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“…where ε is the kinetic energy of electrons, x is the location of electrons, E is the local electric field and = F friction + F F ionization radiation is the friction force caused by inelastic the friction force of electrons moving in gases will be less than the electric field force. Electrons gain energy from electric field continuously and enter the 'fast' or 'runaway' state [24].…”

Section: Discussionmentioning

confidence: 99%

Reconstruction of energy spectrum of runaway electrons in nanosecond-pulse discharges in atmospheric air

Qiu

Zhang

Liu

et al. 2021

Plasma Sci. Technol.

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This paper presents an experimental investigation into the runaway electron spectrum with a gas diode composed of a rough spherical cathode and plane anode under the excitation of a nanosecond-pulse generator in atmospheric air. The runaway electron beams are measured by a collector covered with aluminum foil with a thickness from 0 μm (mesh grid) to 50 μm. The energy spectrum is calculated by an improved Tikhonov regularization called the maximum entropy method. The experimental results show that the transition state of the discharge consisted of multiple streamer channels stretched from the cathode with glow-like plasma uniformly distributed over the anode. The number of runaway electrons measured by the collector is in the order of 1010 in atmospheric pressure air with a gap spacing of 5 mm and applied voltages of 70–130 kV. The cathode with a rough surface creates a more inhomogeneous electric field and larger emission site for the runaway electrons around the cathode, providing conditions for the coexistence of filamentary streamer and diffuse discharge. The reconstructed spectra show that the energy distribution of the runaway electrons presents a single-peak profile with energies from eU m/2–2eU m/3 (U m is maximal voltage across the gap).

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E-beam generation in discharges initiated by voltage pulses with a rise time of 200 ns at an air pressure of 12.5–100 kPa

Cited by 11 publications

References 44 publications

Runaway electrons in diffuse gas discharges

Runaway electrons in diffuse gas discharges

Generation of runaway electrons in plasma after a breakdown of a gap with a sharply non-uniform electric field strength distribution

Reconstruction of energy spectrum of runaway electrons in nanosecond-pulse discharges in atmospheric air

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