Losses in a pulsed electron beam during its formation and extraction from the diode chamber of an accelerator

A. I. Pushkarev, Yu N. Novoselov, R. V. Sazonov

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The results of experimental studies of the current and charge balance in the diode unit of the ∈Cyrillic capital letter EpU-500 high-current pulsed electron accelerator (an accelerating voltage of 350-500 keV, a half-height pulse duration of 60 ns, and a total kinetic electron energy of 250 J/pulse) during generation of an electron beam are presented. Planar diodes with multipointed cathodes having diameters of 43-60 mm and manufactured from graphite, copper, and carbon felt were studied. It is shown that the electron-beam divergence in the anode-cathode gap caused by a distortion in the electric field at the periphery of the cathode is the main source of parasitic losses in planar diodes. The half-angle of divergence is 68° at small anode-cathode gaps and decreases to 60° with an increase in the gap. When the diode impedance is matched to the generator's output impedance (at a gap of 10-12 mm), the charge loss is within 12%.

Original languageEnglish
Pages (from-to)687-694
Number of pages8
JournalInstruments and Experimental Techniques
Volume50
Issue number5
DOIs
Publication statusPublished - 1 Sep 2007

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Particle accelerators
Electron beams
Diodes
Cathodes
accelerators
chambers
cathodes
diodes
electron beams
divergence
Anodes
anodes
impedance
electron accelerators
high current
pulse duration
Graphite
generators
graphite
Electric fields

ASJC Scopus subject areas

  • Engineering (miscellaneous)
  • Instrumentation

Cite this

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abstract = "The results of experimental studies of the current and charge balance in the diode unit of the ∈Cyrillic capital letter EpU-500 high-current pulsed electron accelerator (an accelerating voltage of 350-500 keV, a half-height pulse duration of 60 ns, and a total kinetic electron energy of 250 J/pulse) during generation of an electron beam are presented. Planar diodes with multipointed cathodes having diameters of 43-60 mm and manufactured from graphite, copper, and carbon felt were studied. It is shown that the electron-beam divergence in the anode-cathode gap caused by a distortion in the electric field at the periphery of the cathode is the main source of parasitic losses in planar diodes. The half-angle of divergence is 68° at small anode-cathode gaps and decreases to 60° with an increase in the gap. When the diode impedance is matched to the generator's output impedance (at a gap of 10-12 mm), the charge loss is within 12{\%}.",
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AU - Pushkarev, A. I.

AU - Novoselov, Yu N.

AU - Sazonov, R. V.

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N2 - The results of experimental studies of the current and charge balance in the diode unit of the ∈Cyrillic capital letter EpU-500 high-current pulsed electron accelerator (an accelerating voltage of 350-500 keV, a half-height pulse duration of 60 ns, and a total kinetic electron energy of 250 J/pulse) during generation of an electron beam are presented. Planar diodes with multipointed cathodes having diameters of 43-60 mm and manufactured from graphite, copper, and carbon felt were studied. It is shown that the electron-beam divergence in the anode-cathode gap caused by a distortion in the electric field at the periphery of the cathode is the main source of parasitic losses in planar diodes. The half-angle of divergence is 68° at small anode-cathode gaps and decreases to 60° with an increase in the gap. When the diode impedance is matched to the generator's output impedance (at a gap of 10-12 mm), the charge loss is within 12%.

AB - The results of experimental studies of the current and charge balance in the diode unit of the ∈Cyrillic capital letter EpU-500 high-current pulsed electron accelerator (an accelerating voltage of 350-500 keV, a half-height pulse duration of 60 ns, and a total kinetic electron energy of 250 J/pulse) during generation of an electron beam are presented. Planar diodes with multipointed cathodes having diameters of 43-60 mm and manufactured from graphite, copper, and carbon felt were studied. It is shown that the electron-beam divergence in the anode-cathode gap caused by a distortion in the electric field at the periphery of the cathode is the main source of parasitic losses in planar diodes. The half-angle of divergence is 68° at small anode-cathode gaps and decreases to 60° with an increase in the gap. When the diode impedance is matched to the generator's output impedance (at a gap of 10-12 mm), the charge loss is within 12%.

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