Many breakthrough applications in the medical field have resulted from developments in particle physics instrumentation. CERN continues to support the application of technology developed for accelerators, detectors and computing systems into solutions for present and future health challenges. One such challenge is obtaining high-energy electrons for FLASH radiotherapy, a highly targeted form of cancer treatment, capable of reaching deeper into the patient’s body with less side-effects than traditional radiotherapy. In September 2020, CERN and the Lausanne University Hospital (CHUV) announced their collaboration on an innovative facility that will use CLIC (Compact Linear Collider) accelerator technology, co-developed by CERN and CHUV, to accelerate electrons to very-high energies to treat tumours up to 15 to 20 cm in depth.