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@ARTICLE{Zhang:423434,
      author       = {Zhang, Dongfang and Fallahi, Arya and Hemmer, Michael and
                      Ye, Hong and Fakhari, Moein and Hua, Yi and Cankaya, Huseyin
                      and Calendron, Anne-Laure and Zapata, Luis and Matlis,
                      Nicholas and Kärtner, Franz},
      title        = {{F}emtosecond phase control in high-field terahertz-driven
                      ultrafast electron sources},
      journal      = {Optica},
      volume       = {6},
      number       = {7},
      issn         = {2334-2536},
      address      = {Washington, DC},
      publisher    = {OSA},
      reportid     = {PUBDB-2019-02569},
      pages        = {872－877},
      year         = {2019},
      abstract     = {Terahertz-based electron acceleration has recently emerged
                      as a promising candidate for driving next-generation
                      high-brightness electron sources. Although initial
                      demonstrations have proven the feasibility of this
                      technology for accelerating and manipulating the phase space
                      of electrons, further demonstrations of exquisite timing
                      control are required to make use of terahertz acceleration
                      for demanding applications such as light sources and
                      ultrafast electron diffraction. In this paper, we use a
                      two-stage
                      segmented-terahertz-electron-accelerator-and-manipulator
                      (STEAM) setup to demonstrate control over the electron beam
                      energy, energy spread, and emittance. The first rebunching
                      stage is used to tune the duration of 55 keV electron
                      bunches from a DC electron gun that enables femtosecond
                      phase control at the second accelerating stage. For
                      optimized parameters, energy spread and emittance are
                      reduced by 4× and 6×, respectively, relative to operation
                      with the first stage off. A record energy gain of ∼70 keV
                      was achieved at a peak accelerating field of200 MV/m,
                      resulting in $a>100\%$ energy boost in a terahertz-powered
                      accelerator for the first time. These results represent a
                      critical step forward for the practical implementation of
                      terahertz-powered devices in ultrafast electron sources.},
      cin          = {FS-CFEL-2 / CFEL-UFOX},
      ddc          = {620},
      cid          = {I:(DE-H253)FS-CFEL-2-20120731 /
                      I:(DE-H253)CFEL-UFOX-20160927},
      pnm          = {631 - Accelerator R D (POF3-631) / AXSIS - Frontiers in
                      Attosecond X-ray Science: Imaging and Spectroscopy (609920)
                      / ACHIP - Laser Accelerators on a Chip $(ACHIP_2015-10-01)$
                      / CUI - Hamburger Zentrum für ultraschnelle Beobachtung
                      (194651731) / DFG project 281310551 - SOLSTICE - Festkörper
                      in starken terahertz und infrarotenTräger-Einhüllende
                      phasenstabilen Wellenformen (281310551)},
      pid          = {G:(DE-HGF)POF3-631 / G:(EU-Grant)609920 /
                      $G:(DE-HGF)ACHIP_2015-10-01$ / G:(GEPRIS)194651731 /
                      G:(GEPRIS)281310551},
      experiment   = {EXP:(DE-H253)CFEL-Exp-20150101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000476637300007},
      doi          = {10.1364/OPTICA.6.000872},
      url          = {https://bib-pubdb1.desy.de/record/423434},
}