skip to main content

SciTech ConnectSciTech Connect

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

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/cm{sup 2} showed insignificant erosion along 10{sup 6} pulses of the generator and the generated electron beam current showed excellent reproducibility in terms of the amplitude and waveform.
Authors:
; ; ; ;  [1] ; ; ;  [2] ;  [2] ;  [3]
  1. Physics Department, Technion, Haifa 32000 (Israel)
  2. Institute of High Current Electronics, Siberian Branch, Russian Academy of Sciences, Tomsk 634055 (Russian Federation)
  3. (Russian Federation)
Publication Date:
OSTI Identifier:
22492939
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 118; Journal Issue: 19; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; AMPLITUDES; CATHODES; CURRENT DENSITY; ELECTRIC POTENTIAL; ELECTRON BEAMS; EMISSION; EPOXIDES; EROSION; GRAPHITE; MAGNETIC FIELDS; PLASMA; PULSES; RODS