3 May 2013 Tunable IR/THz source for pump probe experiments at the European XFEL
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We present a concept of an accelerator based source of powerful, coherent IR/THz radiation for pump-probe experiments at the European XFEL. The electron accelerator is similar to that operating at the PITZ facility. It consists of an rf gun and a warm accelerating section (energy up to 30 MeV). The radiation is generated in an APPLE-II type undulator, thus providing polarization control. Radiation with wavelength below 200 micrometers is generated using the mechanism of SASE FEL. Powerful coherent radiation with wavelength above 200 micrometers is generated in the undulator by a tailored (compressed) electron beam. Properties of the radiation are: wavelength range is 10 to 1000 micrometers (30 THz - 0.3 THz), radiation pulse energy is up to a few hundred microjoule, peak power is 10 to 100 MW, spectrum bandwidth is 2 - 3 %. Pump-probe experiments involving ultrashort electron pulses can be realized as well. The time structure of the THz source and x-ray FEL are perfectly matched since the THz source is based on the same technology as the injector of the European XFEL. A similar scheme can also be realized at LCLS, SACLA, or SWISS FEL with S-band rf accelerator technology.
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E. A. Schneidmiller, M. V. Yurkov, M. Krasilnikov, F. Stephan, "Tunable IR/THz source for pump probe experiments at the European XFEL", Proc. SPIE 8778, Advances in X-ray Free-Electron Lasers II: Instrumentation, 877811 (3 May 2013); doi: 10.1117/12.2017014; https://doi.org/10.1117/12.2017014

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