Details

Autor(en) / Beteiligte

• Hoffrogge, Johannes
• Paul Stein, Jan
• Krüger, Michael
• Förster, Michael
• Hammer, Jakob
• Ehberger, Dominik
• Baum, Peter
• Hommelhoff, Peter

Titel

Tip-based source of femtosecond electron pulses at 30 keV

Ist Teil von

• Journal of applied physics, 2014-03, Vol.115 (9)

Ort / Verlag

Melville: American Institute of Physics

Erscheinungsjahr

2014

Link zum Volltext

Quelle

AIP Journals Complete

Beschreibungen/Notizen

• 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.