Dynamics of subnanosecond electron beam formation in gas-filled and vacuum diodes

Mesyats, G. A.; Korovin, S. D.; Sharypov, K. A.; Shpak, V. G.; Shunaĭlov, S. A.; Yalandin, M. I.

doi:10.1134/s1063785006010068

Cited by 65 publications

(64 citation statements)

References 3 publications

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“…The calculated oscillograms of the fast electron current are put as dotted curves on experimental oscillogram from paper [3] (Fig. 1).…”

Section: Resultsmentioning

confidence: 99%

“…In the case of pre-pulse presence the peak current obtained in experiment was 1.2 A, and in the case of pre-pulse absence the current of fast electrons was not obtained. [3], and calculated oscillograms of fast electron current (dash curves). Geometry of problem is in the inset.…”

Section: Resultsmentioning

confidence: 99%

“…1). The oscillograms with peak values of 2.8 A and 0.5 A were calculated for cases of presence and absence of 1 ns pre-pulse (for details see [3]). They are in qualitative agreement with the experimental results.…”

Section: Resultsmentioning

confidence: 99%

“…To avoid the solution of a two-dimensional problem, but at the same time to take into account the amplification of electric field near the tube cathode we took the results of numerical solution of the two-dimensional Laplace equation obtained by Yalandin with the help of computer code SAM [3]. The received amplification factor of electric field near the cathode was used in our one--dimensional calculations.…”

Section: Theorymentioning

confidence: 99%

“…Energy and coordinate distribution of fast electrons n fe (ε, x) was calculated as follows: We made test calculations for the conditions of experiment which was carried out recently in our institute with (1173) use of electron accelerator RADAN and the cathode as a thin-walled tube [3].…”

Section: Theorymentioning

confidence: 99%

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Research of Discharge and Generation of Fast Electrons in Atmospheric Pressure Inhomogeneous Gas Media

et al. 2009

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The paper presents the results of our theoretical investigations of fast electron beam generation in high--temperature plasma of a laser plume and further acceleration of electrons in atmosphere. The discharge formation in these inhomogeneous media was also investigated. Results of calculations have shown an opportunity of generation of fast beam with a current in a range ≈ 10 2 -10 3 A from the laser plume with the length of 5 mm and the area of 0.1 mm 2 . The main reason of limitation of fast electrons current pulse was the breakdown of the discharge gap. The preliminary experiments carried out by us have shown the correctness of chosen direction.

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“…The calculated oscillograms of the fast electron current are put as dotted curves on experimental oscillogram from paper [3] (Fig. 1).…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Theorymentioning

confidence: 99%

Section: Theorymentioning

confidence: 99%

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Research of Discharge and Generation of Fast Electrons in Atmospheric Pressure Inhomogeneous Gas Media

et al. 2009

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Electron beam generation in nitrogen and helium at a low voltage on a gas diode

et al. 2007

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In [1][2][3][4][5][6] (see also reviews [7][8][9] and the references therein) it was reported that electron beams were generated behind the foil of gas diodes filled with gases under increased pressure. In these studies, voltage pulses with amplitudes greater than 100 kV were applied to the gap. The electron beam was generated both in the leading and trailing edges of the voltage pulse when the gap conductivity increased [7][8][9]. The last measurements have demonstrated that the duration at half maximum of the runaway electron beam current was ~0.1 ns under a pressure of various gases of 1 atm [4][5][6]9].Investigations of x-ray radiation of gas diodes [10,11] and electron beams behind the grid anode [12,13] at small amplitudes of voltage pulses ≤20 kV are also known. However, oscillographs with comparatively low time resolution were used in [10][11][12][13]. In addition, the region of electron beam generation and the collector were divided by a grid at low voltages on the gas diode, while it is well known that it is better to use a thin foil to extract the runaway electron beam. The last circumstance influenced the accuracy of measuring the electron beam parameters.The purpose of the present study is to investigate the parameters of a runaway electron beam in nitrogen and helium at a low gap voltage (~25 kV) and to determine the beam generation delay time and the beam duration under these conditions. During investigations, the electron beam parameters were measured behind a metallized film, and the time resolution of the collector and oscillograph was no worse than 0.1 ns.The experimental setup comprised a discharge chamber and a cable pulse generator [14]. The design of the discharge chamber was described in [15]. The inside diameter of the chamber was ~50 mm. Two electrode configurations were used. The first electrode configuration was formed by the flat anode and the convex cathode made from stainless steel with a deposited magnesium coating. The cathode diameter was 20 mm, and its radius of curvature was 12 mm. The second electrode configuration was formed by the flat anode and the cathode with small radius of curvature, which resulted in the electric field gain near the cathode. The cathode from a titanic foil 50 µm thick had a small radius of curvature and was shaped as a tube ~5 mm in diameter. To measure the discharge current, the flat anode was connected to the chamber housing through the shunt consisting of 60 film chips-resistors with resistance of 3.3 Ω each. To register a runaway electron beam, the anode was formed by two metal grids with a transparency of 64% and a metallized film (with a deposited aluminium layer 0.2 µm thick) made from kimfol (C 16 H 14 O 3 ) 2 µm thick or an aluminum foil 3 µm thick. The distance between the cathode and the anode was 6 mm (the first electrode configuration) or 12 mm (the second electrode configuration). The collector with time resolution no worse than 0.1 ns was placed at a distance of 9 mm behind the anode formed by the grids and foil.Some experiments were car...

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On the generation of supershort avalanche electron beams and x radiation during nanosecond discharges in dense gases (results and discussion)

et al. 2007

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Results of investigations of the generation of subnanosecond runaway electron beams and x radiation in gas diodes at elevated pressures are presented. The energy distributions of runaway electron beams generated in air at atmospheric pressure and the amplitude and duration of beam current pulses downstream of the foil have been measured, and also the mechanism of generation of a runaway electron beam has been analyzed. To record the beam current pulses, a collector which provided ~50-ps time resolution and a Tektronix TDS6604 real-time oscilloscope were used in the experiment. It has been shown that the new experimental data and model predictions confirm in the main the results earlier obtained at the Institute of High Current Electronics of the Russian Academy of Sciences Siberian Division. Evidence is cited that the key statements of L. P. Babich are erroneous.

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Dynamics of subnanosecond electron beam formation in gas-filled and vacuum diodes

Cited by 65 publications

References 3 publications

Research of Discharge and Generation of Fast Electrons in Atmospheric Pressure Inhomogeneous Gas Media

Research of Discharge and Generation of Fast Electrons in Atmospheric Pressure Inhomogeneous Gas Media

Electron beam generation in nitrogen and helium at a low voltage on a gas diode

On the generation of supershort avalanche electron beams and x radiation during nanosecond discharges in dense gases (results and discussion)

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