Extended Data Fig. 6: Properties of the electron beam at the entrance of the undulator. | Nature

Extended Data Fig. 6: Properties of the electron beam at the entrance of the undulator.

From: Free-electron lasing at 27 nanometres based on a laser wakefield accelerator

Extended Data Fig. 6

a, Beam current (blue) and slice energy spread (red) within the beam. b, Normalized slice emittance of the beam in the horizontal (red) and the vertical (blue) directions. Despite the slice emittance in the bunch tail increasing substantially (b) and causing an increase in projected emittance (Extended Data Fig. 5b), most of the electrons in the beam still showed a small slice emittance.

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