Abstract
This chapter summarizes several novel seeded FEL experiments that have been recently carried out at the Shanghai deep ultraviolet FEL test facility (SDUV-FEL). A simple method for accurately measuring the slice energy spread of the electron beam has been proposed and experimentally demonstrated at SDUV-FEL. This method has been used in the following EEHG and cascaded HGHG experiments. To distinguish the FEL signal of EEHG from HGHG at low harmonics, we study the electron beam energy chirp effects on different seeded FEL schemes, and found that the output spectrum of an optimized EEHG can be nearly immune to the beam energy chirp. The proof-of-principle experiment for the EEHG has been successfully performed in the ultraviolet region. Design studies for the cascaded HGHG experiment has been given and a novel method based on the energy spectrum of the electron beam has been proposed to demonstrate the “fresh bunch” technique. The first try of cascaded HGHG with a fresh-bunch technique has been also made at SDUV-FEL. The coherent signal from the cascaded HGHG at the fourth harmonic of the seed has been observed.
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Feng, C. (2016). Experimental Studies on Novel High-Gain Seeded FEL Schemes. In: Theoretical and Experimental Studies on Novel High-Gain Seeded Free-Electron Laser Schemes. Springer Theses. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-49066-2_4
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DOI: https://doi.org/10.1007/978-3-662-49066-2_4
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