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@ARTICLE{Bazyl:643478,
      author       = {Bazyl, Dmitry and Floettmann, Klaus and Vogel, Elmar and
                      Zagorodnov, Igor},
      title        = {{M}ultiphysics {A}nalysis of {C}ryogenically {C}ooled
                      {P}hotocathode in a {CW} {SRF} {I}njector cavity},
      reportid     = {PUBDB-2026-00225, arXiv:2508.11764},
      year         = {2025},
      abstract     = {The paper evaluates the thermal regime of a cryogenically
                      cooled copper photocathode integrated into a continuous-wave
                      superconducting radio-frequency injector cavity with direct
                      thermal contact. Such a photoinjector layout is being
                      developed at DESY and has recently demonstrated a
                      record-high 50 MV/m axial electric field in radio-frequency
                      tests, marking an important milestone. To address the
                      thermal effect of the picosecond excitation laser, we first
                      develop a two-temperature model to describe the temperature
                      of the emitting surface at cryogenic temperatures and solve
                      it numerically. Subsequently, we present a one-temperature
                      model of the bulk photocathode coupled with an
                      electromagnetic model of the injector cavity. For the
                      current injector design, we predict a negligible impact of
                      the laser on the intrinsic quality factor of the cavity,
                      identifying instead the cryogenic stability of the copper
                      cathode as the primary operational limit. To overcome
                      cooling challenges, we propose an improved configuration of
                      the cathode plug. For the proposed geometry, the
                      multiphysics analysis confirms stable performance at a
                      nominal 2 W laser power, sufficient for 100 pC beams at 1
                      MHz under optimistic quantum efficiency assumptions.
                      Operation at higher laser loads will benefit from further
                      dedicated cryogenic analysis.},
      cin          = {MSL},
      ddc          = {530},
      cid          = {I:(DE-H253)MSL-20170609},
      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)25},
      eprint       = {2508.11764},
      howpublished = {arXiv:2508.11764},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:2508.11764;\%\%$},
      doi          = {10.3204/PUBDB-2026-00225},
      url          = {https://bib-pubdb1.desy.de/record/643478},
}