Compression of subrelativistic space-charge-dominated electron bunches for single-shot femtosecond electron diffraction.
T. van Oudheusden,P.L.E.M. Pasmans,S.B. van der Geer,M. J. de Loos,M. J. van der Wiel,O.J. Luiten +5 more
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In this paper, the authors demonstrate the compression of 95 keV, space-charge-dominated electron bunches to sub-100 fs durations by means of velocity bunching by inverting the positive space charge-induced velocity chirp.Abstract:
We demonstrate the compression of 95 keV, space-charge-dominated electron bunches to sub-100 fs durations. These bunches have sufficient charge (200 fC) and are of sufficient quality to capture a diffraction pattern with a single shot, which we demonstrate by a diffraction experiment on a polycrystalline gold foil. Compression is realized by means of velocity bunching by inverting the positive space-charge-induced velocity chirp. This inversion is induced by the oscillatory longitudinal electric field of a 3 GHz radio-frequency cavity. The arrival time jitter is measured to be 80 fs.read more
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