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A tip-based source of femtosecond electron pulses at 30keV

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arxiv 1303.2383 v1 pith:VF5Z4LCN submitted 2013-03-10 physics.acc-ph cond-mat.mes-hallphysics.ins-det

A tip-based source of femtosecond electron pulses at 30keV

Johannes Hoffrogge , Jan-Paul Stein , Michael Kr\"uger , Michael F\"orster , Jakob Hammer , Dominik Ehberger , Peter Baum , Peter Hommelhoff This is my paper
classification physics.acc-ph cond-mat.mes-hallphysics.ins-det
keywords pulsesourcedurationelectronfemtosecondpulsestip-basedagreement
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We present a nano-scale photoelectron source, optimized towards ultrashort pulse durations and well-suited for time-resolved diffraction experiments. A tungsten tip, mounted in a suppressor-extractor electrode configuration, allows the generation of 30 keV electron pulses with an estimated pulse duration of 37 fs 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. We furthermore demonstrate femtosecond laser-triggered operation. Besides the short electron pulse duration, a tip-based source is expected to feature a large transverse coherence as well as a nanometric emittance.

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