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Persistent URL http://purl.org/net/epubs/work/50937
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Record Id 50937
Title Start-to-end simulations of SASE and HHG-seeded mode-locked FEL
Abstract Start-to-end modelling of a SASE mode-locked FEL amplifier scheme is presented using a superconducting re-circulating linac design. Locking of the modes is achieved by modulating the electron beam energy at the mode frequency spacing. Previous studies have shown that in a High Harmonic Generation (HHG) seeded mode-coupled FEL amplifier scheme (no electron beam energy modulation), although the attosecond pulse train structure of the seed is amplified through to saturation, a temporal broadening of the individual pulses occurs. An HHG seeded mode-locked FEL amplifier scheme is modelled and it is seen that the temporal spikes of the HHG seed must be correctly phase-matched with the electron beam energy modulation for successful operation. By using a filtered HHG seed, which removes the seed's attosecond pulse train structure, no such phase matching is required. Despite the absence of an initial attosecond pulse structure, a modal structure develops and is subsequently amplified to generate an attosecond pulse train with the good temporal coherence properties of the seed, significantly shorter individual pulse widths and higher peak powers than may be achieved in any of the other schemes.
Organisation ASTeC , ASTeC-AP , ASTeC-MaRS , CI , STFC
Keywords ASTeC 2009-2010 , Mode-lock , Physics , Free Electron Laser , HHG
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Language English (EN)
Type Details URI(s) Local file(s) Year
Paper In Conference Proceedings In 31st International Free Electron Laser Conference (FEL 09), Liverpool, UK, 23-28 Aug 2009, CI Preprints, Cockcroft-09-25 (2009). Cockcroft-09-25.pdf 2009