Giuliano, L. Alesini, D. Behtouei, M. Bisogni, M.G. Bosco, F. Carillo, M. Cirrone, G.A.P. Cuttone, G. De Arcangelis, D. De Gregorio, A. Di Martino, F. Faillace, L. Favaudon, V. Ficcadenti, L. Francescone, D. Franciosini, G. Gallo, A. Heinrich, S. Migliorati, M. Mostacci, A. Palumbo, L. Patera, V. Patriarca, A. Pensavalle, J.H. Sarti, A. Spataro, B. Torrisi, G. Vannozzi, A. JACoW Publishing Geneva, Switzerland 2673-5490 978-3-95450-227-1 10.18429/JACoW-IPAC2022-THPOTK054 English 2903-2906 Contribution to a conference proceedings 2022 2022-07 https://doi.org/10.18429/JACoW-IPAC2022-THPOTK054 https://jacow.org/ipac2022/papers/thpotk054.pdf Translation of electron FLASH radiotherapy in clinical practice requires the use of high energy accelerators to treat deep tumours and Very High Electron Energy (VHEE) could represent a valid technique to achieve this goal. In this sce- nario, a VHEE FLASH linac is under study at the University La Sapienza of Rome (Italy) in collaboration with the Italian Institute for Nuclear Research (INFN) and the Curie Insti- tute (France). Here we present the preliminary results of a compact C-band system aiming to reach an high accelerating gradient and an high pulse current necessary to deliver high dose per pulse and ultra-high dose rate required for FLASH effect. We propose a system composed of a low energy high current injector linac followed by a modular section of high accelerating gradient structures. CST code is used to define the required LINAC’s RF parameters and beam dynamics simulations are performed using T-Step, ASTRA and GPT tracking codes.