Electron beam formation in helium at elevated pressures

Alekseev, S. B.; Orlovskiĭ, V. M.; Тарасенко, В. Ф.; Ткачев, А. Н.; Yakovlenko, S. I.

doi:10.1134/1.1606787

Cited by 17 publications

(32 citation statements)

References 1 publication

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“…A modern nanosecond technique gives the opportunity to go through the lower branch of the Paschen curve and to appear near the runaway branch of the escape curve before the discharge plasma completely short out an interelectrode gap [26][27][28][29][30][31][32][33][34]. The processes involving a transport of heavy particles are not important in case of short voltage pulse.…”

Section: Comparison With Experiments Under a Low Pressurementioning

confidence: 99%

“…However, the amplitudes of electron-beam current did not exceed a few fractions of an ampere (10 9 electrons) in air at atmospheric pressure and several tens of amperes (10 12 electrons) in helium at low pressure of 22 Torr [6]. It was demonstrated in ref [26][27][28][29][30][31][32][33] that subnanosecond electron beams with current amplitudes reaching tens and hundreds of amperes and energies up to several tens or hundreds of keV can be obtained in gas diodes filled with helium, air, nitrogen, or CO 2 -N 2 -He mixtures at atmospheric pressure. Voltage pulses with nanosecond fronts were applied to create such beams.…”

Section: Formation Of An Electron Beam In Dense Gasesmentioning

confidence: 99%

“…Three moments are very interesting in these experimental results [26][27][28][29][30][31][32][33]. Firstly, the maximum of the e-beam current takes place on the front of the applied voltage pulse (Fig.…”

Section: Formation Of An Electron Beam In Dense Gasesmentioning

confidence: 99%

“…23). So, a volume discharge of a diffuse type under nanosecond voltage pulses was observed at the atmospheric pressure without using any sources of preionization [26][27][28][29][30][31][32][33].…”

Section: Formation Of An Electron Beam In Dense Gasesmentioning

confidence: 99%

“…Nowadays, the studies of the mechanism of runaway electrons generation in a gas are topical in view of obtaining electron beams of sub-nanosecond duration with huge current (in air ∼70 A, in helium ∼200 A) at atmospheric pressure [26][27][28][29][30][31][32][33][34]. Some aspects of an electron beam formation according to the non-local criterion of runaway electrons are discussed in sect.…”

Section: Introductionmentioning

confidence: 99%

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Runaway of electrons in dense gases and mechanism of generation of high-power subnanosecond beams

Ткачев

Yakovlenko

2004

Open Physics

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New understanding of mechanism of the runaway electrons beam generation in gases is presented. It is shown that the Townsend mechanism of the avalanche electron multiplication is valid even for the strong electric fields when the electron ionization friction on gas may be neglected. A non-local criterion for a runaway electron generation is proposed. This criterion results in the universal two-valued dependence of critical voltage U cr on pd for a certain gas (p is a pressure, d is an interelectrode distance). This dependence subdivides a plane (U cr , pd ) onto the area of the efficient electron multiplication and the area where the electrons leave the gas gap without multiplication. On the basis of this dependence analogs of Paschen's curves are constructed, which contain an additional new upper branch. This brunch demarcates the area of discharge and the area of e-beam. The mechanism of the formation of the recently created atmospheric pressure subnanosecond e-beams is discussed. It is shown that the beam of the runaway electrons is formed at an instant when the plasma of the discharge gap approaches to the anode. In this case a basic pulse of the electron beam is formed according to the non-local criterion of the runaway electrons generation. The role of the discharge gap preionization by the fast electrons, emitted from the plasma non-uniformities on the cathode, as well as a propagation of an electron multiplication wave from cathode to anode in a dense gas are considered.

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Section: Comparison With Experiments Under a Low Pressurementioning

confidence: 99%

Section: Formation Of An Electron Beam In Dense Gasesmentioning

confidence: 99%

Section: Formation Of An Electron Beam In Dense Gasesmentioning

confidence: 99%

Section: Formation Of An Electron Beam In Dense Gasesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Runaway of electrons in dense gases and mechanism of generation of high-power subnanosecond beams

Ткачев

Yakovlenko

2004

Open Physics

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On the formation of nanosecond volume discharges, subnanosecond runaway electron beams, and x-ray radiation in gases at elevated pressure

Тарасенко

Kostyrya

2005

Russ Phys J

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On formation of subnanosecond electron beams in air under atmospheric pressure

et al. 2004

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This article reports on experimental studies of subnanosecond electron beams formed in air under atmospheric pressure. An electron beam with an amplitude of ∼170 A with a duration at FWHM of ∼0.3 ns has been obtained. Based on beam temporal characteristics and discharge spatial characteristics, the critical fields were supposed to be reached at plasma approach to anode. Simultaneously, the sharp high-energy pulse of e-beam current is generated. Of critical importance is the cathode type and occurrence on the cathode of plasma protrusions. It is shown that to get maximum amplitude of the electron beam in the gas diode, the discharge in the gas diode should be volumetric.

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Electron beam formation in helium at elevated pressures

Cited by 17 publications

References 1 publication

Runaway of electrons in dense gases and mechanism of generation of high-power subnanosecond beams

Runaway of electrons in dense gases and mechanism of generation of high-power subnanosecond beams

On the formation of nanosecond volume discharges, subnanosecond runaway electron beams, and x-ray radiation in gases at elevated pressure

On formation of subnanosecond electron beams in air under atmospheric pressure

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