Tip-based source of femtosecond electron pulses at 30 keV

Language
en
Document Type
Article
Issue Date
2014-04-09
Issue Year
2014
Authors
Hoffrogge, Johannes
Stein, Jan Paul
Krüger, Michael
Förster, Michael
Hammer, Jakob
Ehberger, Dominik
Baum, Peter
Hommelhoff, Peter
Editor
Abstract

We present a nano-scale photoelectron source, optimized for ultrashort pulse durations and well-suited for time-resolved diffraction and advanced laser acceleration experiments. A tungsten tip of several-ten-nanometers diameter mounted in a suppressor-extractor electrode configuration allows the generation of 30 keV electron pulses with an estimated pulse duration of 9 fs (standard deviation; 21 fs full width at half maximum) at the gun exit. We infer the pulse duration from particle tracking simulations, which are in excellent agreement with experimental measurements of the electron-optical properties of the source in the spatial domain. We also demonstrate femtosecond-laser triggered operation of the apparatus. The temporal broadening of the pulse upon propagation to a diffraction sample can be greatly reduced by collimating the beam. Besides the short electron pulse duration, a tip-based source is expected to feature a large transverse coherence and a nanometric emittance.

Journal Title
Journal of Applied Physics
Volume
115
Issue
9
Citation

Journal of Applied Physics 114.9 (2014): 09.04.2014 http://scitation.aip.org/content/aip/journal/jap/115/9/10.1063/1.4867185

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