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MOPRO091 |
Fundamental Limits of Velocity Bunching of High-brightness Electron Beams |
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- A. Opanasenko, V.V. Mytrochenko
NSC/KIPT, Kharkov, Ukraine
- V.A. Goryashko, V. Zhaunerchyk
Uppsala University, Uppsala, Sweden
- P.M. Salen
FYSIKUM, AlbaNova, Stockholm University, Stockholm, Sweden
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The interest in superradiant THz sources based on the coherent transition, synchrotron or undulator radiation grows continuously and such sources require high-quality electron bunches with low emittance, high charge and sub-picosecond (sub-ps) duration. Since accelerator-based THz sources are usually driven by relatively low energy electron bunches of a few tens of MeV, space-charge makes bunch compression to sub-ps level very challenging. In the present work we investigate the feasibility of ballistic bunching down to sub-ps duration while preserving the transverse phase-space quality. We found that in order to compensate for the nonlinear dependency of the arrival time on the energy as well as bunch deformations induced by space-charge effects, one needs to apply a nonlinear energy chirp. This chirp permits to maximize the bunch compression and can be realized by exciting a cavity with higher harmonics of the fundamental frequency. Issues related to synchronizing the harmonics are discussed and the analytical analysis is complemented by simulations with PARMELA.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRO091
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