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Proceedings Paper

The new IR and THz FEL facility at the Fritz Haber Institute in Berlin
Author(s): Wieland Schöllkopf; Sandy Gewinner; Heinz Junkes; Alexander Paarmann; Gert von Helden; Hans P. Bluem; Alan M. M. Todd
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Paper Abstract

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.

Paper Details

Date Published: 12 May 2015
PDF: 13 pages
Proc. SPIE 9512, Advances in X-ray Free-Electron Lasers Instrumentation III, 95121L (12 May 2015); doi: 10.1117/12.2182284
Show Author Affiliations
Wieland Schöllkopf, Fritz-Haber-Institut der Max-Planck-Gesellschaft (Germany)
Sandy Gewinner, Fritz-Haber-Institut der Max-Planck-Gesellschaft (Germany)
Heinz Junkes, Fritz-Haber-Institut der Max-Planck-Gesellschaft (Germany)
Alexander Paarmann, Fritz-Haber-Institut der Max-Planck-Gesellschaft (Germany)
Gert von Helden, Fritz-Haber-Institut der Max-Planck-Gesellschaft (Germany)
Hans P. Bluem, Advanced Energy Systems, Inc. (United States)
Alan M. M. Todd, Advanced Energy Systems, Inc. (United States)

Published in SPIE Proceedings Vol. 9512:
Advances in X-ray Free-Electron Lasers Instrumentation III
Sandra G. Biedron, Editor(s)

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