Speakers
Description
The photoinjector test facility at DESY in Zeuthen (PITZ) is developing a dedicated R&D platform for electron FLASH radiation therapy, known as FLASHlab@PITZ. Benefiting from the long RF pulse (1 ms at 1–10 Hz) of the accelerator and the flexible time structure of the photocathode drive laser, an exceptionally wide range of dose rates—from 0.05 Gy/s to beyond 10¹² Gy/s—can be achieved using 20 MeV electron beams with tunable bunch charges from sub-pC to several nC. In particular, both uniform and spatially fractionated radiation fields can be produced by scanning the electron beam within a single RF pulse. This capability is enabled by an inductive kicker providing vertical deflection on the microsecond timescale and a stripline kicker for horizontal deflection on the sub-microsecond timescale. These features allow systematic investigations of the FLASH effect as well as spatially fractionated radiation therapy (SRFT) in biological samples. In this contribution, we present the design performance of the kicker system along with measurement results from beam-scanning experiments, with particular emphasis on the delivered electron beam and dose distributions.
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