NEEDLE CATHODES FOR HIGH-BRIGHTNESS BEAMS
2007 ◽
Vol 22
(22)
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pp. 3784-3793
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Keyword(s):
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.
2004 ◽
Vol 108
(17)
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pp. 5182-5184
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Keyword(s):
2008 ◽
Vol 42
(3)
◽
pp. 251-254
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2006 ◽
Vol 15
(4-8)
◽
pp. 875-879
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Keyword(s):
1999 ◽
Vol 43
(8)
◽
pp. 1425-1428
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Keyword(s):
1990 ◽
Vol 23
(6)
◽
pp. 637-642
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Keyword(s):
Keyword(s):