Design and test of C-band prototypes linac for FLASH radiotherapy

FLASH Radiotherapy (RT) represents an innovative technique in cancer treatment, delivering high radiation doses in microsecond pulses. In collaboration with INFN, Sapienza University of Rome is actively engaged in developing innovative C-band structures for Very High Electron Energy (VHEE) linac to achieve the FLASH regime and to treat deep tumors. The RF electromagnetic design of the accelerating structures was carried out using CST Studio Suite. Following the design phase, we proceeded with the mechanical design and fabrication of copper prototypes. To assess their performance, low-power RF tests were conducted at Sapienza University of Rome and the field measurements within the cavity were obtained using the bead-pull technique.These prototypes serve as crucial milestones towards the final structure of the VHEE Linac.