Original title: Thermal-field electron emission W(100)/ZrO cathode: facets versus edges
Authors: Matějka, František ; Horáček, Miroslav ; Kolařík, Vladimír ; Matějka, Milan
Document type: Papers
Conference/Event: International Seminar on Recent Trends in Charged Particle Optics and Surface Physics Instrumentation /13./, Skalský dvůr (CZ), 2012-06-25 / 2012-06-29
Year: 2012
Language: eng
Abstract: The tungsten cathode in the thermal-field emission (TFE) regime can achieve significantly higher angular current density in comparison with the Schottky cathode. The Schottky emission regime is located between the thermal emission regime and the cold field emission regime. The typical operation electric field is 0,1 - I V/nm and tip radius varies from 0.3 to 1.0 im . The thermal-field regime is located between the Schottky regime and the cold field emission regime. In the cold field emission regime the electron tunnelling is a dominant mechanism due to the electric field higher than 1 V/nm. The TFE is a combination of the field supported thermal emission and the field emission under the higher electric field. The radius of the thermal-field emitter should be lower in comparison with the Schottky emitter.
Keywords: electron emission; thermal field cathode; tungsten crystallography
Project no.: ED0017/01/01
Funding provider: GA MŠk
Host item entry: Proceedings of the 13th International Seminar on Recent Trends in Charged Particle Optics and Surface Physics Instrumentation, ISBN 978-80-87441-07-7

Institution: Institute of Scientific Instruments AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0215701

Permalink: http://www.nusl.cz/ntk/nusl-135994


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