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Title: Charge state, angular distribution, and kinetic energy of ions from multicomponent-cathodes in vacuum arc devices

We present research results on vacuum arc plasma produced with multicomponent cathode made of several different elements. The ion mass-to-charge-state spectra of the plasmas were studied by time-of-flight spectrometry. The angular distributions of different ion species were measured, and the kinetic energy of their directed (streaming) motion was determined. It is shown that the fractional composition of ions of different cathode components in the plasma flow from the cathode spot closely matches the fractional content of these components in the composite cathode. The charge states of ions of the various cathode components are determined by the average electron temperature in the cathode spot plasma. The angular distribution of lower mass ions in the plasma from a multicomponent cathode is less isotropic and broader than for the plasma from a single-component cathode of the same light element. The directed kinetic energies of the ions of the different components for plasma from a multicomponent cathode are lower for lighter elements and greater for heavier elements compared to the ion directed energy for plasmas from single-component cathodes made of the same materials. The physical processes responsible for these changes in the ion charge states in multicomponent-cathode vacuum arc plasma are discussed.
Authors:
; ; ;  [1] ;  [1] ;  [2] ;  [3]
  1. Institute of High Current Electronics SB RAS, 2/3 Akademichesky Ave., Tomsk 634055 (Russian Federation)
  2. (Russian Federation)
  3. Prokhorov General Physics Institute RAS, 38 Vavilov St., Moscow 119991 (Russian Federation)
Publication Date:
OSTI Identifier:
22402709
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 21; Other Information: (c) 2014 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; ANGULAR DISTRIBUTION; CATHODES; CHARGE STATES; ELECTRON TEMPERATURE; EQUIPMENT; IONS; KINETIC ENERGY; MASS; MATERIALS; PLASMA; SPECTRA; SPECTROSCOPY; TIME-OF-FLIGHT METHOD