The CLIC study has developed compact, high-gradient, and energy-efficient acceleration units as building blocks for a future high-energy, electron-positron linear collider. The components to construct such units, including RF sources, are now generally available in industry and their properties promise cost-effective solutions for making compact electron-based linacs (already a crucial technology in many research, medical, and industrial facilities) more efficient and compact.
The CLIC study has actively promoted and supported spin-off developments for a decade. Examples include beam manipulation and diagnostic devices in research linacs, including Free-Electron Laser light sources; compact inverse Compton scattering X-ray sources; medical linacs, including FLASH radiotherapy; and compact neutron sources for material investigations. This paper describes the X-band technologies developed as part of the CLIC study and discusses examples of compact linacs utilising such technology for different applications.

