7–12 May 2023
Venice, Italy
Europe/Zurich timezone

A novel fibre optic monitor for VHEE UHDR beam monitoring: first tests at CLEAR

THPL041
11 May 2023, 16:30
2h
Sala Laguna

Sala Laguna

Poster Presentation MC6.A28: Medical Applications Thursday Poster Session

Speaker

Joseph Bateman (John Adams Institute)

Description

Beam monitoring for Ultra High Dose Rate (UHDR) radiation therapy using pulsed beams, i.e. Very High Energy Electrons (VHEE), is a major challenge. The lower pulse repetition of VHEE beams means a larger dose-per-pulse is necessary to achieve the mean dose rates required for UHDR therapy (so-called FLASH). The currently used transmission ion chambers suffer drastic recombination effects under these conditions. A proposed detector consisting of a 2D array of silica optical fibres connected to a photodetector which measures the Cherenkov radiation emitted by the VHEE beam as it passes through the fibres could be a promising alternative due to its high spatial and temporal resolution and its low material budget. First measurements with such a detector, consisting of silica optical fibres with a diameter of 200 μm, have been conducted at the CLEAR facility at CERN using 200 MeV electrons up to the UHDR required for FLASH. Measurements on the dynamic range of the fibre detector showed that it had a linear response at mean dose rates of over 300 Gy/s. Such results show that this fibre-optic based beam monitor is able to provide fast direct real-time measurements of the VHEE beam dose and profile up to the UHDR. This makes them an excellent candidate for online dosimetry and beam diagnostics in future clinical FLASH machines with VHEE and other beam types.

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Primary author

Joseph Bateman (John Adams Institute)

Co-authors

Emma Buchanan (European Organization for Nuclear Research (CERN)) Roberto Corsini (European Organization for Nuclear Research) Alexander Gerbershagen (Particle Therapy Research Center) Inaki Ortega Ruiz (European Organization for Nuclear Research) Manjit Dosanjh (European Organization for Nuclear Research) Wilfrid Farabolini (Commissariat à l'Energie Atomique) Vilde Rieker (European Organization for Nuclear Research) Pierre Korysko (Oxford University) Alexander Malyzhenkov (European Organization for Nuclear Research)

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