Efficient harmonic microbunching in a 7th-order inverse-free-electron laser interaction

We have shown that a seventh-order inverse-free-electron laser (IFEL) interaction, where the radiation frequency is the seventh harmonic of the fundamental resonant frequency, can microbunch a beam of relativistic electrons inside an undulator. Using coherent transition radiation (CTR) emitted by th...

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Bibliographic Details
Published inPhysical review special topics. PRST-AB. Accelerators and beams Vol. 12; no. 5; p. 050703
Main Authors Tochitsky, S. Ya, Williams, O. B., Musumeci, P., Sung, C., Haberberger, D. J., Cook, A. M., Rosenzweig, J. B., Joshi, C.
Format Journal Article
LanguageEnglish
Published College Park American Physical Society 01.05.2009
Subjects
Free electron lasers
Harmonics
Radiation
Resonant frequencies
Spatial distribution
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Summary:We have shown that a seventh-order inverse-free-electron laser (IFEL) interaction, where the radiation frequency is the seventh harmonic of the fundamental resonant frequency, can microbunch a beam of relativistic electrons inside an undulator. Using coherent transition radiation (CTR) emitted by the bunched 12.3 MeV beam as a diagnostic, strong microbunching of the beam is inferred from the observation of CTR at the first, second, and third harmonics of the seed 10μm radiation. Three-dimensional IFEL simulations show that the observed harmonic ratios can be explained only if transverse spatial distribution of the steepened bunched beam is taken into account.
ISSN:1098-4402
1098-4402
2469-9888
DOI:10.1103/PhysRevSTAB.12.050703