scholarly journals High-current-density, high brightness cathodes for free electron laser applications

1987 ◽  
Author(s):  
M.C. Green
Keyword(s):  
Current Density ◽  
Free Electron ◽  
Free Electron Laser ◽  
High Current Density ◽  
High Current ◽  
Laser Applications ◽  
High Brightness

NEEDLE CATHODES FOR HIGH-BRIGHTNESS BEAMS

2007 ◽  
Vol 22 (22) ◽  
pp. 3784-3793 ◽  
Author(s):  
C. H. BOULWARE ◽  
J. D. JARVIS ◽  
H. L. ANDREWS ◽  
C. A. BRAU
Keyword(s):  
Field Emission ◽  
Current Density ◽  
High Current Density ◽  
Thermionic Emission ◽  
High Current ◽  
High Brightness ◽  
Electron Sources ◽  
Schottky Effect ◽  
Surface Electric Field ◽  
Very High

At the tips of sharp needles, the surface electric field is enhanced by many orders of magnitude. This intensifies thermionic emission and photoemission of electrons through the Schottky effect, and reduces the effect of space charge. The increased current density improves the brightness of electron sources by orders of magnitude. In addition, at very high fields (>109 V/m ), field emission and photo-field emission produce very high current density. Arrays of needles can be used to achieve high total current.

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