WEXXPLM —  Contributed Orals: Photon Sources and Electron Accelerators   (22-May-19   09:30—10:30)
Chair: T.O. Raubenheimer, SLAC, Menlo Park, California, USA
Paper Title Page
WEXXPLM1 Amplified Emission of a Soft-X Ray Free-Electron Laser Based on Echo-Enabled Harmonic Generation 2230
  • E. Allaria, L. Badano, G. De Ninno, S. Di Mitri, B. Diviacco, W.M. Fawley, N.S. Mirian, G. Penco, P. Rebernik Ribič, S. Spampinati, C. Spezzani, M. Trovò
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
  • G. De Ninno
    University of Nova Gorica, Nova Gorica, Slovenia
  • E. Ferrari, E. Prat
    PSI, Villigen PSI, Switzerland
  • D. Garzella
    CEA, Gif-sur-Yvette, France
  • V. Grattoni
    DESY, Hamburg, Germany
  • E. Hemsing
    SLAC, Menlo Park, California, USA
  • M.A. Pop
    MAX IV Laboratory, Lund University, Lund, Sweden
  • E. Roussel
    PhLAM/CERLA, Villeneuve d’Ascq, France
  • D. Xiang
    Shanghai Jiao Tong University, Shanghai, People’s Republic of China
  We report the first evidence of substantial gain in a soft-X ray Free Electron Laser (FEL) based on Echo-Enabled Harmonic Generation (EEHG). The experiment was focused on harmonics 36 (~7.3nm) and 45 (5.8 nm) and clearly demonstrated the expected EEHG capability of generating powerful and coherent FEL pulses, with strongly reduced sensitivity to electron-beam fluctuations. The experiment was carried out at FERMI, the seeded FEL user facility at Elettra-Sincrotrone Trieste.  
slides icon Slides WEXXPLM1 [11.410 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEXXPLM1  
About • paper received ※ 17 May 2019       paper accepted ※ 23 May 2019       issue date ※ 21 June 2019  
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Slippage Boosted Spectral Cleaning in a Seeded Free-Electron Laser  
  • C. Feng
    SARI-CAS, Pudong, Shanghai, People’s Republic of China
  The realization of fully coherent X-ray radiation pulse has been a long-standing challenge for free-electron lasers. A promising way for producing stable transform-limited pulses is based on the harmonic up-conversion techniques with a conventional laser as the seed. However, it is found that the insignificant phase error in the seed laser will be eventually multiplied by the harmonic number, leading to a degradation of the output temporal coherence at short wavelength. Here, we report the demonstration of a slippage boosted spectral cleaning technique to mitigate the impact of seed laser induced phase errors and to improve the temporal coherence of a seeded FEL. Experimental results show that fully coherent radiation pulses can be generated in a seeded FEL with the help of the proposed technique.  
slides icon Slides WEXXPLM2 [4.915 MB]  
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Photocathodes Research Activities for High Brigtheness Beams, Spin Polarized Sources and Large Area Photon Detectors at Cornell University  
  • L. Cultrera, J. Bae, I.V. Bazarov, C.J.R. Duncan, A. Galdi, F. Ikponmwen, W. H. Li, J.M. Maxsonpresenter, C. M. Pierce
    Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
  Funding: NSF award no. PHY-1549132, DOE awards no. DE-SC0011643 and DE-SC0019122
We will a give broad description of recent results from Cornell University on improving the state of the art in the production of high brightness photoemitted electron beams for future light sources and ultrafast electron scattering. We will also discuss recent results on improving the lifetime of photocathode for spin polarized electron beam and on the production of large area photocathodes for single photon detection applications
slides icon Slides WEXXPLM3 [7.384 MB]  
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