Dresden 2026 – scientific programme

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 7: Ion and Medical Accelerators

AKBP 7.2: Talk

Tuesday, March 10, 2026, 14:15–14:30, SCH/A117

Dosimetry for FLASH Radiotherapy with High-Energy Electrons at ELSA — •Anne Stähler, Klaus Desch, Dennis Proft, Michael Switka, and Leonardo Thome — Physikalisches Institut der Universität Bonn

At the electron accelerator facility ELSA, FLASH radiotherapy is being studied. This treatment concept utilises high dose rates in nanosecond to microsecond pulses, which may reduce damage to healthy tissue and improve treatment for deep-seated tumours. Experiments are performed with high-energy electrons between 1.2 GeV and 3.2 GeV, to investigate the underlying beam properties. By applying a newly implemented extraction mode, spill durations of around 330 ns can be achieved. The electromagnetic shower and beam profile throughout water are characterised with Gafchromic films and Cherenkov-light measurements. These results provide, for the first time at energies up to 3.2 GeV, an understanding of the beam properties under FLASH conditions for future radiation studies.

Keywords: FLASH radiotherapy; high-energy electrons; electromagnetic shower; dosimetry