12 May 2015 The new IR and THz FEL facility at the Fritz Haber Institute in Berlin
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A mid-infrared oscillator FEL has been commissioned at the Fritz Haber Institute. The accelerator consists of a thermionic gridded gun, a subharmonic buncher, and two S-band standing-wave copper structures. It provides a final electron energy adjustable from 15 to 50 MeV, low longitudinal (< 50 keV ps) and transverse emittance (< 20 πmm mrad), at more than 200 pC bunch charge with a micro-pulse repetition rate of 1 GHz and a macro-pulse length of up to 15 µs. Pulsed radiation with up to 100 mJ macro-pulse energy at about 0.5% FWHM bandwidth is routinely produced in the wavelength range from 4 to 48 µm. A characterization of the FEL performance in terms of pulse energy, bandwidth, and micro-pulse shape of the IR radiation is given. In addition, selected user results are presented. These include, for instance, spectroscopy of bio-molecules (peptides and small proteins) either conformer selected by ion mobility spectrometry or embedded in superfluid helium nano-droplets at 0.4 K, as well as vibrational spectroscopy of mass-selected metal-oxide clusters and protonated water clusters in the gas phase.
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Wieland Schöllkopf, Wieland Schöllkopf, Sandy Gewinner, Sandy Gewinner, Heinz Junkes, Heinz Junkes, Alexander Paarmann, Alexander Paarmann, Gert von Helden, Gert von Helden, Hans P. Bluem, Hans P. Bluem, Alan M. M. Todd, Alan M. M. Todd, } "The new IR and THz FEL facility at the Fritz Haber Institute in Berlin", Proc. SPIE 9512, Advances in X-ray Free-Electron Lasers Instrumentation III, 95121L (12 May 2015); doi: 10.1117/12.2182284; https://doi.org/10.1117/12.2182284

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