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@ARTICLE{Long:612730,
      author       = {Long, Tianyun and Chen, Ye Lining and Decking, Winfried and
                      Geloni, Gianluca and Guetg, Marc and huang, senlin and
                      Kocharyan, Vitali and Liu, Shan and Qin, Weilun and Serkez,
                      Svitozar and Yan, Jiawei},
      title        = {{C}ontrol of bandwidth and signal-to-noise ratio for hard
                      {X}-ray self-seeded free-electron lasers},
      journal      = {Physical review applied},
      volume       = {23},
      number       = {4},
      issn         = {2331-7019},
      address      = {College Park, Md. [u.a.]},
      publisher    = {American Physical Society},
      reportid     = {PUBDB-2024-05447},
      pages        = {044038},
      year         = {2025},
      abstract     = {Hard X-ray self-seeded (HXRSS) free-electron lasers (FELs)
                      can provide nearly fully coherent radiation pulses in the
                      hard X-ray domain with extremely high spectral density,
                      which opens up new possibilities for a wide range of
                      scientific applications such as resonant inelastic X-ray
                      scattering, nuclear resonance scattering, and X-ray Raman
                      spectroscopy. Spectral bandwidth and signal-to-noise ratio
                      (SNR) are two important parameters for seeded FELs. Our
                      theoretical and experimental studies demonstrate that the
                      bandwidth and SNR of HXRSS FELs are closely tied to the
                      electron-beam energy profile and current profile,
                      respectively. Nearly Fourier-transform-limited bandwidth can
                      be realized by flattening the energy profile. For beams with
                      asymmetric current profiles, a higher SNR can be obtained by
                      tuning the current peak towards the head. With proper
                      manipulation of the longitudinal phase space of the beam,
                      decreased bandwidth and improved SNR may further enable more
                      demanding applications requiring higher spectral
                      resolution.},
      cin          = {MXL},
      ddc          = {530},
      cid          = {I:(DE-H253)MXL-20160301},
      pnm          = {621 - Accelerator Research and Development (POF4-621) /
                      6G13 - Accelerator of European XFEL (POF4-6G13)},
      pid          = {G:(DE-HGF)POF4-621 / G:(DE-HGF)POF4-6G13},
      experiment   = {EXP:(DE-H253)XFEL(machine)-20150101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:001494746000002},
      doi          = {10.1103/PhysRevApplied.23.044038},
      url          = {https://bib-pubdb1.desy.de/record/612730},
}