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Regulation of the Transmitted Electron Flux in a Field-Emission Electron Source Demonstrated on Si Nanowhisker Cathodes

  • We report on a method to stabilize the transmitted electron flux in a field-emission electron source using an external regulation circuit. The electron source was realized with an array of silicon (Si) nanowhiskers on the top of elongated pillar structures, a mica spacer, and an extraction grid made of Si. As for most applications, the emitted electron current from the cathode is not as crucial as the transmitted electron flux through the extraction grid toward the anode. We investigated a method which allows the regulation directly by the emitted electron flux and not merely on the cathode current. By using this method, we were able to stabilize the emitted electron flux of our electron source down to values below 1%. Simultaneously, it was shown that there is the possibility to stabilize the influencing value in the real application as well. The effectiveness of this method was demonstrated successfully with an X-ray source setup. The measured X-ray photon count rate was stabilized to a standard deviation of 0.30% at a pressure of 1 × 10 -7 mbar. Even in harsh environment of 2 × 10 -5 mbar, a stabilization of the X-ray photon count rate down to a value of 0.63% was achieved.

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Metadaten
Author:Christian PrommesbergerORCiD, Michael BachmannORCiD, Felix Düsberg, Christoph LangerORCiD, Robert Damian ŁawrowskiORCiD, Martin Hofmann, Andreas Pahlke, Rupert SchreinerORCiDGND
DOI:https://doi.org/10.1109/TED.2017.2763239
ISSN:5128-5133
Parent Title (English):IEEE Transactions on Electron Devices
Document Type:Article
Language:English
Year of first Publication:2017
Release Date:2021/05/06
Tag:Cathodes; Current measurement; Electron sources; Emissions; Nanostructured devices; Photonics; Voltage measurement
Volume:64
Issue:12
Institutes:Fakultät Angewandte Natur- und Kulturwissenschaften
Fakultät Angewandte Natur- und Kulturwissenschaften / Labor Mikrosensorik
Begutachtungsstatus:peer-reviewed
research focus:Sensorik
Licence (German):Keine Lizenz - Es gilt das deutsche Urheberrecht: § 53 UrhG