Speaker
Description
To reach integrated luminosity goals, the FCC-ee must be operational for minimum 80% of the scheduled 185 physics days each year. For comparison, the LHC achieved 77% in Run 2, 2016-2018. There are additional challenges in operation and maintenance of the FCC-ee due to its scale, complexity and ambitious technical objectives. Availability is therefore a significant risk to physics deliverables. This presentation deconstructs the availability challenge in the FCC-ee according to its top-level systems. Contributions are in three parts: (I) For the first time, availability requirements are defined for each system, scaled according to the complexity of delivery. The methodology also provides a platform to translate changes in system availability to that of the collider overall. (II) Following a blueprint to be repeated for each system, availability of the RF is projected in Monte Carlo simulation from existing colliders to the FCC-ee. Forecasts for the Z and W modes are highly inadequate, suggesting a radical change in operation and maintenance paradigm is required. (III) Solutions to the availability problem are proposed and exploratory simulations analysed for several potentially game-changing R&D opportunities.
