Electron source and acceleration regime of a picosecond electron beam in a gas-filled diode with inhomogeneous field

Mesyats, G. A.; Shpak, V. G.; Shunaĭlov, S. A.; Yalandin, M. I.

doi:10.1134/s1063785008020259

Cited by 40 publications

(33 citation statements)

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“…Experiments were carried out on a picosecond high-voltage setup, whose operation principle and capabilities are described in detail elsewhere (Mesyats et al, 2006(Mesyats et al, , 2008a(Mesyats et al, , 2008bYalandin et al, 2010b). No focusing longitudinal magnetic field was applied.…”

Section: Methodsmentioning

confidence: 99%

“…Therefore, the accelerating pulse was initially chosen to have an amplitude margin (V max ), so that all REs were certainly injected and accelerated within the voltage rise time. The time at which the RE injection ceased and the corresponding voltage (V off ) (see Experiment 1) could be preliminarily estimated from time-of-flight measurements of the particle energy (Mesyats et al, 2008b) or, as it was done in the present work, by using a simple "statistical" technique (Yalandin et al, 2010b). Thereafter, the voltage amplitude was gradually decreased from V max to V off .…”

Section: Experimental Approachesmentioning

confidence: 99%

“…As a result, the upper limit of RE injection voltages (V real ≤ V off ) was estimated more precisely than this could be done by the methods described earlier (Mesyats et al, 2008b;Yalandin et al, 2010b). To check whether V real was determined correctly enough, it was estimated additionally on increasing the voltage amplitude from V off to V max (Experiments 3 and 4).…”

Section: Experimental Approachesmentioning

confidence: 99%

“…However, for an air gap with a highly nonuniform field only recently, with the advent of modern broadband instrumentation, it has been demonstrated experimentally (Mesyats et al, 2006(Mesyats et al, , 2008a(Mesyats et al, , 2008b) that the flow of runaway electrons (RE) is injected from the near-cathode region within the subnanosecond rise time of the accelerating pulse, it has a picosecond duration (less than 50 ps FWHM), and is not formed during the discharge, but, on the contrary, initiates the latter.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Methodsmentioning

confidence: 99%

Section: Experimental Approachesmentioning

confidence: 99%

Section: Experimental Approachesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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On the observed energy of runaway electron beams in air

et al. 2011

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“…The main efforts of researchers are aimed at increasing the efficiency of electron transition to the continuous acceleration mode, which is a necessary condition for generation of high power beams of fast electrons. This problem can conventionally be solved using specially shaped cath odes [1][2][3][4]. In this case, the efficiency of fast electron generation increases due to the formation of regions of enhanced electric field in a gas filled diode.…”

mentioning

confidence: 99%

Generation of accelerated electrons in a gas diode with hot channel

Lisenkov

Shklyaev

2013

Tech. Phys. Lett.

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Abstract-Generation of fast electrons in an inhomogeneous medium composed of a hot channel (spark channel, laser plume, etc.) surrounded by air under normal conditions has been numerically analyzed. The model used makes it possible to carry out consistent calculation of the formation of subnanosecond gas dis charge and generation of accelerated electrons under these conditions. The fast electron current is found to consist of two pulses. One of them has an amplitude of 50 A, width of 30 ps, and electron energy of more than 100 keV. These electrons are generated in the hot channel. The other pulse has an amplitude of 170 A, width of 20 ps, and electron energy in the range of 8-50 keV. These electrons are generated in cold air. Since these pulses pass successively and barely overlap, the total width of fast electron pulse is almost 50 ps.

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