Energy spread of ultracold electron bunches extracted from a laser cooled gas

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Ultrashort and ultracold electron bunches created by near-threshold femtosecond photoionization of a laser cooled gas hold great promise for single-shot ultrafast diffraction experiments. In previous publications the transverse beam quality and the bunch length have been determined. Here the longitudinal energy spread of the generated bunches is measured for the first time, using a specially developed Wien filter. The Wien filter has been calibrated by determining the average deflection of the electron bunch as a function of magnetic field. The measured relative energy spread σU/U = 0.64 ± 0.09% agrees well with the theoretical model which states that it is governed by the width of the ionization laser and the acceleration length.

Original languageEnglish
Article number035007
Number of pages7
JournalJournal of Physics B: Atomic, Molecular and Optical Physics
Issue number3
Publication statusPublished - 16 Jan 2018


  • energy spread
  • ultracold electron source
  • ultrashort electron bunches
  • Wien filter


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