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Diamond field emission arrays (DFEAs) for high-power free electron lasers

By: Howell, M.; Ghosh, N.; Davidson, J.L.; Choi, B.K.; Jarvis, J.D.; Kang, W.P.; Wong, Y.M.; Brau, C.A.; Andrews, H.L.;

2009 / IEEE / 978-1-4244-3587-6

Description

This item was taken from the IEEE Conference ' Diamond field emission arrays (DFEAs) for high-power free electron lasers ' Compared to the present prevalent use of photocathodes for free-electron lasers (FELs), the field-emitter array (FEAs) possesses several advantages as an electron source, namely, high brightness, ruggedness, no drive laser requirement and minimal heat generation. And, compared to Spindt-type molybdenum (Mo) and silicon-tips FEAs, diamond FEAs (DFEAs) have strong carbon-carbon covalent bonding (high activation energy for electromigration), are chemically inert, mechanically and thermally stable, with a low sputter coefficient (resistant to bombardment of positive ions) and low electron affinity for efficient electron emission.