Speaker
Description
Very high energy electrons (VHEE) are a potential future modality in the field of radiotherapy. They have garnered considerable interest because they possess a unique combination of several properties including: being capable of deep tissue penetration (>30 cm), relative insensitivity to tissue inhomogeneities and being well suited to FLASH therapy. FLASH is the use of ultra-high dose rates which have been shown to reduce cell death in healthy tissue whilst maintaining toxicity to tumours. Recent studies indicate that higher energy beams produce less scattering and more precise dose delivery up to at least 250 MeV. This paper provides a design for a 250 MeV linac with dose rates exceeding 100 Gy/s in a 10 cm × 10 cm wide field size. The design is centred on a bi-periodic, π/2 mode, normal conducting, standing wave, accelerating cavity which emphasises stability. A gradient of 100 MV/m has been chosen to achieve the compactness potentially required to fit the accelerator in a hospital setting. To this end, 11.9942 GHz X-band technology has been selected which, along with extensive cell geometry optimisation, has produced a shunt impedance of > 95 MΩ/m and whilst minimising surface electric and magnetic fields.
Funding Agency
UK Research and Innovation (UKRI) Science and Technology Facilities Council (STFC)
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