Electron beam profile imaging in the presence of coherent optical radiation effects

High-brightness electron beams with low energy spread at existing and future x-ray free-electron lasers are affected by various collective beam self-interactions and microbunching instabilities. The corresponding coherent optical radiation effects, e.g., coherent optical transition radiation, render...

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Bibliographic Details
Published in:arXiv.org 2012-06
Main Authors: Behrens, Christopher, Gerth, Christopher, Kube, Gero, Schmidt, Bernhard, Wesch, Stephan, Yan, Minjie
Format: Article
Language:English
Subjects:
Coherence
Computer simulation
Dispersion
Electron beams
Electrons
Emission analysis
Free electron lasers
Imaging
Laser beams
Optical radiation
Optical transition
Plasma
Radiation effects
Screens
Separation
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Summary:High-brightness electron beams with low energy spread at existing and future x-ray free-electron lasers are affected by various collective beam self-interactions and microbunching instabilities. The corresponding coherent optical radiation effects, e.g., coherent optical transition radiation, render electron beam profile imaging impossible and become a serious issue for all kinds of electron beam diagnostics using imaging screens. Furthermore, coherent optical radiation effects can also be related to intrinsically ultrashort electron bunches or the existence of ultrashort spikes inside the electron bunches. In this paper, we discuss methods to suppress coherent optical radiation effects both by electron beam profile imaging in dispersive beamlines and by using scintillation imaging screens in combination with separation techniques. The suppression of coherent optical emission in dispersive beamlines is shown by analytical calculations, numerical simulations, and measurements. Transverse and longitudinal electron beam profile measurements in the presence of coherent optical radiation effects in non-dispersive beamlines are demonstrated by applying a temporal separation technique.
ISSN:2331-8422
DOI:10.48550/arxiv.1203.1169