The ATS-Directorate Office (ATS-DO) is a unit of the Accelerator and Technology sector staffed by persons working on projects or studies such as HL-LHC, FCC, CLIC and EU activities.

The Beams Department hosts the Groups responsible for the beam generation, acceleration, diagnostics, controls and performance optimization for the whole CERN accelerator complex.

The Engineering Department provides CERN with the Engineering Competences, Infrastructure Systems and Technical Coordination required for the design, installation, operation, maintenance and dismantling phases of the CERN accelerator complex and its experimental facilities.

The Technology Department is responsible for technologies which are specific to existing particle accelerators, facilities and future projects. These include magnets, their machine integration and protection, power converters, cryogenics, high and ultra-high vacuum systems, coatings and surface treatments.