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Effects of emittance and energy spread in an electron bunch on THz radiation generated by a super-radiant source: report III of the series of reports by the Swedish FEL Center and FREIA Group
B.I. Stepanov Institute of Physics, National Academy of Science of Belarus,.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy. (FREIA group)
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy. current address: Department of Physics, University of Gothenburg, Sweden . (Molecular and Condensed Matter Physics)
2014 (English)Report (Other academic)
Abstract [en]

In this report we summarize our results on simulation of a super-radiant sourceoperating at the THz spectral range. We consider an open-type undulator com-prising plane magnets but without any guiding structure for generated THz eld.The undulator is assumed to be driven by electron bunches of femtosecond durationwhich are produced by an rf Linac. Using a numerical model developed, we analyzeeects of the bunch parameters on output performance of the super-radiant sourceand reveal some surprising results. Specically, we show that degradation in bunchspatial quality (increase in the bunch emittance) should lead to decrease in angulardivergence and spectral narrowing of the THz radiation. We also demonstrate thatelectron energy spread which commonly leads to bunch broadening and radiativeenergy drop can be eventually suppressed under appropriate conditions.

Place, publisher, year, edition, pages
2014. , 14 p.
FREIA Report, 2014-02
National Category
Accelerator Physics and Instrumentation
Research subject
URN: urn:nbn:se:uu:diva-219365OAI: diva2:699684
Available from: 2014-02-28 Created: 2014-02-27 Last updated: 2015-10-08Bibliographically approved

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Goryashko, VitaliyZhaunerchyk, Vitali
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