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Description
Electron LINACs are key tools for radiotherapy. Conventional low-energy ones can treat only superficial tumors. Achieving Very High Energy Electrons (VHEE, >100 MeV) enables treatment of deep-seated tumors. Furthermore, electrons are well-suited for delivering Ultra-High Dose Rates (UHDR) required for FLASH therapy, which improves healthy-tissue sparing. Combining VHEE and FLASH in a hospital environment represents an important step forward for Radiotherapy.
In the context of the SAFEST project at Sapienza, this work presents a compact and cost-effective accelerator layout capable of delivering hundreds of nC at 100 MeV within tens of pulses over 1 ms of irradiation. The design emphasizes efficient RF power usage through high-efficiency C-band structures and a pulse compressor. Beam dynamics simulations and low-power RF tests validate the approach. A strong focus is placed on flattening the compressor signal, which must remain stable over 1 mus to accommodate electrons from a triode thermionic gun, a compact and economical source for this accelerator. The resulting 3-m linac, powered by a single 20-MW klystron, shows strong potential for future hospital-based FLASH VHEE treatments.
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