Mohamed A. K. Othman, Matthias C. Hoffmann, Michael E. Kozina, X. J. Wang, R. K. Li, and Emilio A. Nanni
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| Fig. 1 (a) Terahertz tapered parallel-plate waveguide for MeV electron bunch compression. (b) Example of single cycle THz waveform measured using EOS in free space (with a 100 µm thick GaP crystal) and its spectrum in (c) that is coupled into the structure. (d) The resulting electric field profile of the coupled THz electric field |
https://www.osapublishing.org/oe/abstract.cfm?uri=oe-27-17-23791
We demonstrate the electromagnetic performance of waveguides for femtosecond electron beam bunch manipulation and compression with strong-field terahertz (THz) pulses. The compressor structure is a dispersion-free exponentially-tapered parallel-plate waveguide (PPWG) that can focus single-cycle THz pulses along one dimension. We show test results of the tapered PPWG structure using electro-optic sampling (EOS) at the interaction region with peak fields of at least 300 kV/cm, given 0.9 µJ of incoming THz energy. We also present a modified shorted design of the tapered PPWG for better beam manipulation and reduced magnetic field as an alternative to a dual-feed approach. As an example, we demonstrate that with 5 µJ of THz energy, the PPWG compresses a 2.5 MeV electron bunch by a compression factor of more than 4, achieving a bunch length of about 18 fs.
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