Invited Article: Coherent imaging using seeded free-electron laser pulses with variable polarization: First results and research opportunities

Journal Article · Wed May 15 00:00:00 EDT 2013 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4807157· OSTI ID:22118546

Capotondi, F.; Pedersoli, E.; Mahne, N.; Menk, R. H.; Passos, G.; Raimondi, L.; Svetina, C.; Sandrin, G.; Kiskinova, M. ^[1]; Zangrando, M. ^[1]; Bajt, S.; Barthelmess, M.; Fleckenstein, H.; Chapman, H. N. ^[2]; Schulz, J. ^[3]; Bach, J.; Froemter, R. ^[4]; Schleitzer, S.; Mueller, L.; Gutt, C. ^[5] ; others, and

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1. FERMI, Elettra-Sincrotrone Trieste, SS 14 - km 163.5, 34149 Basovizza, Trieste (Italy)
2. CFEL-DESY, Notkestrasse 85, 22607 Hamburg (Germany)
3. European XFEL GmbH, Albert-Einstein-Ring 19, 22761 Hamburg (Germany)
4. Universitaet Hamburg, Institut fuer Angewandte Physik, 20355 Hamburg (Germany)
5. DESY, Notkestrasse 85, 22607 Hamburg (Germany)

FERMI-Elettra, the first vacuum ultraviolet and soft X-ray free-electron laser (FEL) using by default a 'seeded' scheme, became operational in 2011 and has been opened to users since December 2012. The parameters of the seeded FERMI FEL pulses and, in particular, the superior control of emitted radiation in terms of spectral purity and stability meet the stringent requirements for single-shot and resonant coherent diffraction imaging (CDI) experiments. The advantages of the intense seeded FERMI pulses with variable polarization have been demonstrated with the first experiments performed using the multipurpose experimental station operated at the diffraction and projection imaging (DiProI) beamline. The results reported here were obtained with fixed non-periodic targets during the commissioning period in 2012 using 20-32 nm wavelength range. They demonstrate that the performance of the FERMI FEL source and the experimental station meets the requirements of CDI, holography, and resonant magnetic scattering in both multi- and single-shot modes. Moreover, we present the first magnetic scattering experiments employing the fully circularly polarized FERMI pulses. The ongoing developments aim at pushing the lateral resolution by using shorter wavelengths provided by double-stage cascaded FERMI FEL-2 and probing ultrafast dynamic processes using different pump-probe schemes, including jitter-free seed laser pump or FEL-pump/FEL-probe with two color FEL pulses generated by the same electron bunch.

• OSTI ID: 22118546
• Journal Information: Review of Scientific Instruments, Vol. 84, Issue 5; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
BEAM BUNCHING
COMMISSIONING
CONTROL
DIFFRACTION
ELECTRONS
FREE ELECTRON LASERS
HOLOGRAPHY
IMPURITIES
LIGHT SCATTERING
OPTICAL PUMPING
PARTICLE BEAMS
POLARIZATION
PROBES
PULSES
SOFT X RADIATION
ULTRAVIOLET RADIATION
WAVELENGTHS
X-RAY LASERS