Tip-based source of femtosecond electron pulses at 30 keV

Journal Article · Fri Mar 07 00:00:00 EST 2014 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4867185· OSTI ID:22277940

Hoffrogge, Johannes; Paul Stein, Jan ^[1]; Krüger, Michael; Förster, Michael; Hammer, Jakob; Ehberger, Dominik; Hommelhoff, Peter ^[1]; Baum, Peter ^[1]

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1. Max Planck Institute of Quantum Optics, Hans-Kopfermann-Str. 1, 85748 Garching (Germany)

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.

• OSTI ID: 22277940
• Journal Information: Journal of Applied Physics, Vol. 115, Issue 9; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
07 ISOTOPES AND RADIATION SOURCES
ACCELERATION
COMPUTERIZED SIMULATION
DIFFRACTION
ELECTRODES
ELECTRONS
LASERS
NANOSTRUCTURES
OPTICAL PROPERTIES
PHOTOELECTRON SPECTROSCOPY
PULSES
TIME RESOLUTION
TUNGSTEN