TUA —  Tuesday - Early Morning   (27-Aug-19   09:00—10:30)
Chair: E. Prat, PSI, Villigen PSI, Switzerland
Paper Title Page
TUA01 Parallel Operation of SASE1 and SASE3 at the European XFEL 25
  • S. Liu, F. Brinker, W. Decking, L. Fröhlich, R. Kammering, D. Nölle, F. Obier, E. Schneidmiller, M. Scholz, T. Wilksen, M.V. Yurkov
    DESY, Hamburg, Germany
  • R. Boll, N. Gerasimova, T. Mazza, M. Meyer, A. Scherz, H. Sinn
    EuXFEL, Schenefeld, Germany
  At the European XFEL a hard X-Ray SASE FEL (SA-SE1) and a soft X-Ray SASE FEL (SASE3) share in series the same electron beamline. This configuration couples the operation conditions for both undulators and their subsequent user experiments in terms of SASE in-tensity and background. We report on our experience in parallel operation and discuss the solutions that enable the operation of both undulators as independently as possible.  
slides icon Slides TUA01 [13.809 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-FEL2019-TUA01  
About • paper received ※ 26 August 2019       paper accepted ※ 17 October 2019       issue date ※ 05 November 2019  
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Two-Pulse Schemes in Soft and Hard X-Ray FELs: Robustness Analysis of State-of-the-Art Solutions  
  • A.A. Lutman
    SLAC, Menlo Park, California, USA
  Funding: U.S.Department of Energy, Office of Science, Laboratory Directed Research and Development (LDRD) program at SLAC National Accelerator Laboratory, under Contract No. DE-AC02-76SF00515
Several X-ray two-pulse schemes have been developed to meet the increasing experimental requirements in terms of power, wavelength separation and delay control. For particular experiments, the wavelength or the delay applicability range limits the choice of the usable scheme to a single one. In other occasions multiple schemes can produce the desired X-ray beams and the choice of the used one falls on operation simplicity. An example are two-color beams in the soft X-rays produced with the fresh-slice schemes that can be enabled by different time-dependent orbit control or by transverse matching. The focus in this talk will be on the operation robustness, reliability and reproducibility for the different two-color schemes.
slides icon Slides TUA02 [14.972 MB]  
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Generation of Sub-Femtosecond X-Ray Pulses at SwissFEL  
  • A. Malyzhenkov, Y.P. Arbelo, S. Bettoni, P. Craievich, P. Dijkstal, E. Ferrari, P.N. Juranič, E. Prat, S. Reiche
    PSI, Villigen PSI, Switzerland
  We report on the first generation of sub-femtosecond hard X-ray FEL pulses at SwissFEL. A few microjoule pulses with a single spike in the frequency domain have been predicted by simulations and then experimentally demonstrated. Ultra-short X-ray pulses are produced by the electron bunch with a specially-tailored current profile and longitudinal phase space. This configuration is achieved by means of an optimized nonlinear compression. Two- and three-stage nonlinear compression schemes are compared in terms of FEL performance and stability. We also discuss different FEL lasing regimes that can be realized depending on the particular configuration of the electron beam and undulator settings.  
slides icon Slides TUA03 [1.809 MB]  
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TUA04 Harmonic Lasing Experiment at the European XFEL 29
  • E. Schneidmiller, F. Brinker, W. Decking, M.W. Guetg, S. Liu, D. Nölle, M. Scholz, M.V. Yurkov, I. Zagorodnov
    DESY, Hamburg, Germany
  • G. Geloni, N. Gerasimova, J. Grünert, S. Karabekyan, N.G. Kujala, J. Laksman, Y. Li, J. Liu, Th. Maltezopoulos, I. Petrov, L. Samoylova, S. Serkez, H. Sinn, F. Wolff-Fabris
    EuXFEL, Schenefeld, Germany
  Harmonic lasing is an opportunity to extend the photon energy range of existing and planned X-ray FEL user facilities. Contrary to nonlinear harmonic generation, harmonic lasing can provide a much more intense, stable, and narrow-band FEL beam. Another interesting application is Harmonic Lasing Self-Seeding (HLSS) that allows to improve the longitudinal coherence and spectral power of a Self-Amplified Spontaneous Emission (SASE) FEL. This concept was successfully tested at FLASH in the range of 4.5 - 15 nm and at PAL XFEL at 1 nm. In this contribution we present recent results from the European XFEL where we successfully demonstrated operation of HLSS FEL at 5.9 Angstrom and 2.8 Angstrom, in the latter case obtaining both 3rd and 5th harmonic lasing.  
slides icon Slides TUA04 [1.174 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-FEL2019-TUA04  
About • paper received ※ 20 August 2019       paper accepted ※ 29 August 2019       issue date ※ 05 November 2019  
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