Spectra of electrons and X-ray photons in a diffusive nanosecond discharge in air under atmospheric pressure

Бакшт, Е. Х.; Бураченко, А. Г.; Kozyrev, A. V.; Kostyrya, I. D.; Ломаев, М. И.; Petin, V. K.; Рыбка, Д. В.; Тарасенко, В. Ф.; Shljakhtun, S. V.

doi:10.1134/s1063784209010071

Cited by 16 publications

(22 citation statements)

References 10 publications

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“…Moreover, the statement that the runaway electron beam formed in atmospheric pressure air is almost monoenergetic (Babich et al, 2014) and is erroneous in our opinion, because the generation of a monoenergetic runaway electron beam varying at gap voltage and varying current through the gap is rather problematic. The data reported in the cited papers contradict both our results (Baksht et al, 2008a;2008b;2009;Tarasenko et al, 2005;2008;2011;2013) and those reported elsewhere (Mesyats et al, 2011;Yatom et al, 2011). In particular, Mesyats et al (2011) consider that the maximum energy for runaway electrons produced in atmospheric pressure air cannot exceed eU m under any conditions.…”

Section: Introductioncontrasting

confidence: 72%

“…Now, the most divergent spectral measurement data are those for supershort avalanche electron beams (SAEBs) produced in point-to-plane gaps in atmospheric pressure air. According to our studies, the spectrum of a SAEB generated in atmospheric pressure air can sometimes reveal two to three groups of electrons differing in energy (Bakhst et al, 2008a;2009;Tarasenko, 2011;Tarasenko et al, 2005;2008;2011;2013). Electrons of the first (low-energy) group have kinetic energies T 1 < eU m /3; those of the second (main) group have energies eU m /3 < T 2 < eU m ; and electrons of the third group, which are termed electrons with "anomalous" energy (Babich & Loiko, 1985), have energies T 3 > eU m .…”

Section: Introductionmentioning

confidence: 87%

“…Increasing the number of electrons in the third group requires a decrease in voltage pulse rise time and an increase in cathode curvature radius. However, even under optimum SAEB generation conditions, the number of electrons of the third group is small and is not >10% of the total number of electrons downstream of an Al anode foil 10 μm thick (Baksht et al, 2010).…”

Section: Introductionmentioning

confidence: 96%

“…The spectra of electron beams are measured with magnetic spectrometers (Bugaev et al, 1974;Mangles et al, 2004;Li et al, 2006) and time-of-flight spectrometers (Gloeckler & Hsieh, 1979). The spectra of nano-and subnanosecond electron beams are also measured with the use of different methods (Bugaev et al, 1974;Afanasiev et al, 2005;Baksht et al, 2007), including the measurements of beam current attenuation in foils of different thickness (Baksht et al, 2010). Now, the most divergent spectral measurement data are those for supershort avalanche electron beams (SAEBs) produced in point-to-plane gaps in atmospheric pressure air.…”

Section: Introductionmentioning

confidence: 99%

“…A more complex method is that in which the initial electron beam is represented as a superposition of the N number of monoenergetic electron groups with energy E 1 , E 2 , E 3 ,…, E N and intensity I 1 , ,…, I N (Baksht et al, 2009). The intensity can be represented by the electron charge or electron beam current.…”

Section: Introductionmentioning

confidence: 99%

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Reconstruction of electron beam energy spectra for vacuum and gas diodes

et al. 2015

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In this paper, the spectra of electron beams produced in vacuum and gas diodes were analyzed to study the capabilities and limitations of their reconstruction from beam attenuation in foils of different thickness. The electron energy distributions were calculated using the Tikhonov regularization for Fredholm integral equations on minimum a priori assumptions. The spectra reconstructed in the study were those of electron beams, including a supershort avalanche electron beam, produced in experiments on a DUET plasma-cathode electron accelerator and SLEP-150M accelerator.

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Section: Introductioncontrasting

confidence: 72%

Section: Introductionmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Reconstruction of electron beam energy spectra for vacuum and gas diodes

et al. 2015

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On the observed energy of runaway electron beams in air

et al. 2011

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Experiments with an air electrode gap have been performed where the current/charge of a picosecond beam of runaway electrons was measured over a wide range (up to four orders of magnitude) downstream of the absorbing foil filters. Measurements and calculations have made it possible to refer the beam current to the rise time of the accelerating voltage pulse to within picoseconds. It has been shown that, in contrast to a widespread belief, the runaway electron energies achieved are no greater than those corresponding to the mode of free acceleration of electrons in a nonstationary, highly nonuniform electric field induced by the cathode voltage. The experimental data agree with predictions of a numerical model that describes free acceleration of particles. It has been confirmed that the magnitude of the critical electric field that is necessary for electrons to go into the mode of continuous acceleration of electrons in atmospheric air corresponds to classical notions.

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X-ray emission from a nanosecond-pulse discharge in an inhomogeneous electric field at atmospheric pressure

Zhang¹,

Shao²,

Тарасенко³

et al. 2012

Physics of Plasmas

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This paper describes experimental studies of the dependence of the X-ray intensity on the anode material in nanosecond high-voltage discharges. The discharges were generated by two nanosecond-pulse generators in atmospheric air with a highly inhomogeneous electric field by a tube-plate gap. The output pulse of the first generator (repetitive pulse generator) has a rise time of about 15 ns and a full width at half maximum of 30–40 ns. The output of the second generator (single pulse generator) has a rise time of about 0.3 ns and a full width at half maximum of 1 ns. The electrical characteristics and the X-ray emission of nanosecond-pulse discharge in atmospheric air are studied by the measurement of voltage-current waveforms, discharge images, X-ray count and dose. Our experimental results showed that the anode material rarely affects electrical characteristics, but it can significantly affect the X-ray density. Comparing the density of X-rays, it was shown that the highest x-rays density occurred in the diffuse discharge in repetitive pulse mode, then the spark discharge with a small air gap, and then the corona discharge with a large air gap, in which the X-ray density was the lowest. Therefore, it could be confirmed that the bremsstrahlung at the anode contributes to the X-ray emission from nanosecond-pulse discharges.

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Spectra of electrons and X-ray photons in a diffusive nanosecond discharge in air under atmospheric pressure

Cited by 16 publications

References 10 publications

Reconstruction of electron beam energy spectra for vacuum and gas diodes

Reconstruction of electron beam energy spectra for vacuum and gas diodes

On the observed energy of runaway electron beams in air

X-ray emission from a nanosecond-pulse discharge in an inhomogeneous electric field at atmospheric pressure

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