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| Home > Publications database > Generating Homogeneous And Spatially Fractionated Radiation Fields By Electron Beam Scanning |
| Conference Presentation | PUBDB-2026-00178 |
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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.
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