FCC-SEED: A Vertex Detector Concept for Future Electron-Positron Colliders at CERN – J. Andrea (IPHC) – June 13rd 2025 @2pm

In the most recent update of the European Strategy for Particle Physics, a consensus emerged to prioritise the development of an electron-positron (e⁺e⁻) collider as the next major facility. This decision sets the stage for the upcoming European Strategy update in 2026, which is expected to define the concrete priorities for CERN’s future collider projects. Among the proposed options are the Compact Linear Collider (CLIC) and the International Linear Collider (ILC), now jointly pursued under the Linear Collider initiative (LC@CERN), as well as the Future Circular Collider (FCC) program, which envisions an initial stage as a circular e⁺e⁻ collider (FCC-ee).

Within this international context, and based on the world wide recognised expertise of French laboratories on CMOS pixel sensors, a  French-led effort has been initiated to design an innovative vertex detector, FCC-SEED, tailored for such future colliders. The detector concept is based on ultra-light, thin Monolithic Active Pixel Sensors (MAPS), bent to reduce the material budget and enhance detector acceptance.

This presentation will begin with an overview of the FCC-ee project and its key physics motivations. We will then outline the performance requirements for a vertex detector at FCC-ee. Following this, we will introduce the FCC-SEED design concept, highlighting its geometry and technological choices. Finally, we will present the current progress on bending and testing MIMOSIS chips, a key component in this development.

The seminar will be in English.