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Title: Emission properties and back-bombardment for CeB{sub 6} compared to LaB{sub 6}

The emission properties of CeB{sub 6} compared to LaB{sub 6} thermionic cathodes have been measured using an electrostatic DC gun. Obtaining knowledge of the emission properties is the first step in understanding the back-bombardment effect that limits wide usage of thermionic radio-frequency electron guns. The effect of back-bombardment electrons on CeB{sub 6} compared to LaB{sub 6} was studied using a numerical simulation model. The results show that for 6 μs pulse duration with input radio-frequency power of 8 MW, CeB{sub 6} should experience 14% lower temperature increase and 21% lower current density rise compared to LaB{sub 6}. We conclude that CeB{sub 6} has the potential to become the future replacement for LaB{sub 6} thermionic cathodes in radio-frequency electron guns.
Authors:
 [1] ;  [2] ; ; ; ;  [3]
  1. Physics Department, Faculty of Science, Assiut University, Assiut, 71516 (Egypt)
  2. LNS, Graduate School of Science, Tohoku University, Sendai 982-0826 (Japan)
  3. Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto 611-0011 (Japan)
Publication Date:
OSTI Identifier:
22413108
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 6; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CATHODES; CERIUM BORIDES; COMPARATIVE EVALUATIONS; COMPUTERIZED SIMULATION; CURRENT DENSITY; ELECTRON GUNS; ELECTRONS; LANTHANUM BORIDES; RADIOWAVE RADIATION; THERMIONIC EMISSION