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Figure 8
Inset: schematic of spatial filtering of radiation emitted by non-sliced electrons at the radiator image plane. The 3σx beam size of the non-sliced electron beam is approximately 200 µm at the source point (see electron distribution in Fig. 7[link]). Tail radiation from particles at large betatron amplitudes extends up to ∼500 µm from the beam central axis (x = −480 µm in the inset). A slit absorbs the radiation up to 300 µm (x = −180 µm) from the undulator axis. In the main plot: spectral flux density from sliced (red curve) and non-sliced electrons (blue curve), after removal of tail background radiation by the slit. The blue curve is multiplied by a factor 100 for better visibility. Around x = 0, where the short photon pulse radiation is centred, the short pulse intensity is at least 103 larger than the residual background radiation.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 26| Part 5| September 2019| Pages 1523-1538
https://doi.org/10.1107/S1600577519009901
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