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@ARTICLE{Ferrari:612376,
      author       = {Ferrari, Eugenio},
      title        = {{T}win {E}cho {E}nabled {H}armonic {G}eneration with
                      {F}requency {D}own-{C}onversion for {U}nprecedented
                      {C}oherent {B}unching at {S}hort {W}avelengths},
      journal      = {Physical review accelerators and beams},
      volume       = {27},
      number       = {11},
      issn         = {2469-9888},
      address      = {College Park, MD},
      publisher    = {American Physical Society},
      reportid     = {PUBDB-2024-05328},
      pages        = {110705},
      year         = {2024},
      abstract     = {Harmonic up-conversion schemes represent the most
                      successful approach in externally seeded free-electron
                      lasers (FELs) for obtaining radiation with laser-like
                      properties at short wavelengths. They are however limited in
                      the shortest achievable wavelengths, as the harmonic
                      conversion efficiency decreases with increasing harmonic
                      number, even for echo-enabled harmonic generation (EEHG). In
                      the following, we introduce a novel externally seeded
                      cascaded FEL scheme based on two EEHG stages, the second of
                      which working in harmonic down-conversion, i.e. going
                      towards (slightly) longer wavelengths, capable of obtaining
                      unprecedented bunching fraction that is independent on the
                      final FEL wavelength.Its performance at 4 nm and shorter is
                      investigated, demonstrating the ability to achieve multi-GW
                      level, fully coherent pulses with laser-like properties and
                      paving the way for externally seeded radiation at 1 nm and
                      beyond.},
      cin          = {MPY},
      ddc          = {530},
      cid          = {I:(DE-H253)MPY-20120731},
      pnm          = {621 - Accelerator Research and Development (POF4-621) / 6G2
                      - FLASH (DESY) (POF4-6G2)},
      pid          = {G:(DE-HGF)POF4-621 / G:(DE-HGF)POF4-6G2},
      experiment   = {EXP:(DE-H253)FLASH2020p-20221201 /
                      EXP:(DE-H253)F-sFLASH-20171201},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:001371913100003},
      doi          = {10.1103/PhysRevAccelBeams.27.110705},
      url          = {https://bib-pubdb1.desy.de/record/612376},
}