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Title: Suppression of shunting current in a magnetically insulated coaxial vacuum diode

Real-time investigations of the dynamics of explosive electron emission from a high-voltage cathode holder made of nonmagnetic stainless steel in a magnetically insulated coaxial vacuum diode have been performed. It has been shown that aging the cathode with several tens of voltage pulses at a field of 1–2 MV/cm provides a stray emission delay ranging from hundreds of picoseconds to a nanosecond or more. In addition, the magnetic field must be configured so that the magnetic lines would not cross the vacuum gap between the diode case and the cathode holder in the region behind the emitting edge of the cathode. These efforts provide conditions for stable emission of the working beam from a graphite cathode with a sharp emitting edge.
Authors:
; ; ; ;  [1] ;  [2] ;  [3]
  1. Institute of Electrophysics UD RAS, Ekaterinburg 620016 (Russian Federation)
  2. P.N. Lebedev Physical Institute RAS, Moscow 119991 (Russian Federation)
  3. Institute of High Current Electronics SD RAS, Tomsk 634055 (Russian Federation)
Publication Date:
OSTI Identifier:
22412571
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 23; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BYPASSES; CATHODES; DIODE TUBES; ELECTRON EMISSION; GRAPHITE; MAGNETIC FIELDS; STAINLESS STEELS