Experimental research of different plasma cathodes for generation of high-current electron beams

G. Shafir, M. Kreif, J. Z. Gleizer, S. Gleizer, Ya E. Krasik, A. V. Gunin, O. P. Kutenkov, I. V. Pegel, V. V. Rostov

Division for Materials Science

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Abstract

The results of experimental studies of different types of cathodes - carbon-epoxy rods, carbon-epoxy capillary, edged graphite, and metal-dielectric - under the application of high-voltage pulses with an amplitude of several hundreds of kV and pulse duration of several nanoseconds are presented. The best diode performance was achieved with the edged graphite and carbon-epoxy-based cathodes characterized by uniform and fast (<1 ns) formation of explosive emission plasma spots and quasi-constant diode impedance. This result was achieved for both annular cathodes in a strong magnetic field and planar cathodes of a similar diameter (∼2 cm) with no external magnetic field. The cathodes based on carbon-epoxy rods and carbon-epoxy capillaries operating with an average current density up to 1 kA/cm² showed insignificant erosion along 10⁶ pulses of the generator and the generated electron beam current showed excellent reproducibility in terms of the amplitude and waveform.

Original language	English
Article number	193302
Journal	Journal of Applied Physics
Volume	118
Issue number	19
DOIs	https://doi.org/10.1063/1.4935880
Publication status	Published - 21 Nov 2015

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ASJC Scopus subject areas

Physics and Astronomy(all)

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Shafir, G., Kreif, M., Gleizer, J. Z., Gleizer, S., Krasik, Y. E., Gunin, A. V., Kutenkov, O. P., Pegel, I. V., & Rostov, V. V. (2015). Experimental research of different plasma cathodes for generation of high-current electron beams. Journal of Applied Physics, 118(19), [193302]. https://doi.org/10.1063/1.4935880

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title = "Experimental research of different plasma cathodes for generation of high-current electron beams",

abstract = "The results of experimental studies of different types of cathodes - carbon-epoxy rods, carbon-epoxy capillary, edged graphite, and metal-dielectric - under the application of high-voltage pulses with an amplitude of several hundreds of kV and pulse duration of several nanoseconds are presented. The best diode performance was achieved with the edged graphite and carbon-epoxy-based cathodes characterized by uniform and fast (<1 ns) formation of explosive emission plasma spots and quasi-constant diode impedance. This result was achieved for both annular cathodes in a strong magnetic field and planar cathodes of a similar diameter (∼2 cm) with no external magnetic field. The cathodes based on carbon-epoxy rods and carbon-epoxy capillaries operating with an average current density up to 1 kA/cm2 showed insignificant erosion along 106 pulses of the generator and the generated electron beam current showed excellent reproducibility in terms of the amplitude and waveform.",

author = "G. Shafir and M. Kreif and Gleizer, {J. Z.} and S. Gleizer and Krasik, {Ya E.} and Gunin, {A. V.} and Kutenkov, {O. P.} and Pegel, {I. V.} and Rostov, {V. V.}",

year = "2015",

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AU - Shafir, G.

AU - Kreif, M.

AU - Gleizer, J. Z.

AU - Gleizer, S.

AU - Krasik, Ya E.

AU - Gunin, A. V.

AU - Kutenkov, O. P.

AU - Pegel, I. V.

AU - Rostov, V. V.

PY - 2015/11/21

Y1 - 2015/11/21

N2 - The results of experimental studies of different types of cathodes - carbon-epoxy rods, carbon-epoxy capillary, edged graphite, and metal-dielectric - under the application of high-voltage pulses with an amplitude of several hundreds of kV and pulse duration of several nanoseconds are presented. The best diode performance was achieved with the edged graphite and carbon-epoxy-based cathodes characterized by uniform and fast (<1 ns) formation of explosive emission plasma spots and quasi-constant diode impedance. This result was achieved for both annular cathodes in a strong magnetic field and planar cathodes of a similar diameter (∼2 cm) with no external magnetic field. The cathodes based on carbon-epoxy rods and carbon-epoxy capillaries operating with an average current density up to 1 kA/cm2 showed insignificant erosion along 106 pulses of the generator and the generated electron beam current showed excellent reproducibility in terms of the amplitude and waveform.

AB - The results of experimental studies of different types of cathodes - carbon-epoxy rods, carbon-epoxy capillary, edged graphite, and metal-dielectric - under the application of high-voltage pulses with an amplitude of several hundreds of kV and pulse duration of several nanoseconds are presented. The best diode performance was achieved with the edged graphite and carbon-epoxy-based cathodes characterized by uniform and fast (<1 ns) formation of explosive emission plasma spots and quasi-constant diode impedance. This result was achieved for both annular cathodes in a strong magnetic field and planar cathodes of a similar diameter (∼2 cm) with no external magnetic field. The cathodes based on carbon-epoxy rods and carbon-epoxy capillaries operating with an average current density up to 1 kA/cm2 showed insignificant erosion along 106 pulses of the generator and the generated electron beam current showed excellent reproducibility in terms of the amplitude and waveform.

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10.1063/1.4935880