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TY - UNPB AU - Schneidmiller, E. ED - Bishofberger, Kip:Carlsten, Bruce (LANL, Los Alamos, NM, USA)[ORCID:0000-0001-5619-907X] ED - Schaa, Volker RW TI - Energy Chirp and Undulator Taper in FELs J2 - Proc. of FEL2017, Santa Fe, NM, USA, August 20-25, 2017 C1 - Santa Fe, NM, USA T2 - International Free Electron Laser Conference T3 - 38 LA - english AB - The effects of energy chirp and undulator taper in FELs and applications of these effects in different schemes are discussed. This includes an operation of FEL oscillators with reverse-tapered undulators; energy chirp effects in high-gain, short wavelength FELs like FLASH; compensation of the energy chirp by the undulator taper in high-gain FELs and the application of this effect for generation of attosecond X-ray pulses; reverse taper in high-gain FELs for circular polarization production and for an efficient, background-free harmonic generation. Some new ideas are briefly described such as strongly chirped X-ray pulses, an enhanced X-ray pulse compression, few-cycle hard X-ray pulses etc. PB - JACoW CP - Geneva, Switzerland ER -