% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@INPROCEEDINGS{Li:643394,
      author       = {Li, Xiangkun and Amirkhanyan, Zohrab Gevorg and Aminzadeh
                      Gohari, Sepideh and Grebinyk, Anna and Good, James David and
                      Komar, Yuliia and Gross, Matthias and Krasilnikov, Mikhail
                      and Mueller, Frieder and Oppelt, Anne and Richard,
                      Christopher James and Riemer, Felix and Tarakci, Elif and
                      Vashchenko, Grygorii and Villani, Daniel},
      title        = {{G}enerating {H}omogeneous {A}nd {S}patially {F}ractionated
                      {R}adiation {F}ields {B}y {E}lectron {B}eam {S}canning},
      reportid     = {PUBDB-2026-00178},
      year         = {2025},
      abstract     = {Background and AimsThe upgraded $R\&D$ platform for
                      electron FLASH radiation therapy – FLASHlab@PITZ, is under
                      commissioning at the photoinjector test facility at DESY in
                      Zeuthen (PITZ). One major purpose of the new beamline is to
                      demonstrate the performance of a sweeping system, which
                      scans the electron beams within one RF pulse (≤1 ms, 1-10
                      Hz) across the transverse plane and produces both
                      homogeneous and spatially fractionated radiation fields at
                      the dose rate of >106 Gy/s.MethodsIn the new beamline, an
                      achromatic dogleg section has been installed to direct the
                      electron beams to the experimental area with preserved high
                      beam quality, followed by quadrupole magnets to focus and
                      shape the beam distribution, and a sweeping system to scan
                      the beam in the transverse plane. By adjusting the size of
                      and distance between the electron beams, homogeneous or
                      spatially fractionated dose distributions can be produced.
                      The distribution of scanned electron beams and the resulting
                      dose distribution are measured.ResultsThe electron beam
                      generated by the photoinjector is transported to the
                      experimental area with a tunable beam size. By applying the
                      high voltage of the kicker, the electron beam can be kicked
                      vertically. By tuning the beam size, the kicker strength and
                      the distance between the exit window and the measurement
                      station, the peak-to-valley dose ratio (PVDR) of the
                      produced radiation field is adjusted, including a uniform
                      dose distribution. The results from start-to-end simulations
                      and from measurements, including the potential dose and dose
                      rate parameter space from the new beamline, will be
                      presented.ConclusionThe electron beam scanning technique
                      demonstrated at FLASHlab@PITZ enables the generation of
                      arbitrary radiation fields at ultra-high dose rates.
                      Combined with its highly flexible dose and dose rate
                      parameters, this approach paves the way for investigating
                      the FLASH radiation effects in relation to the spatial and
                      temporal distribution of delivered dose.},
      month         = {Dec},
      date          = {2025-12-10},
      organization  = {5th FLASH Radiotherapy $\&$ Particle
                       Therapy, Prague (Czech Republic), 10
                       Dec 2025 - 12 Dec 2025},
      cin          = {$Z_PITZ$},
      cid          = {$I:(DE-H253)Z_PITZ-20210408$},
      pnm          = {621 - Accelerator Research and Development (POF4-621)},
      pid          = {G:(DE-HGF)POF4-621},
      experiment   = {EXP:(DE-H253)PITZ-20150101},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://bib-pubdb1.desy.de/record/643394},
}