Advanced, Lightweight and Fine-grained Apparatus (ALFA) for e+e- physics (Duccio Abbaneo, CERN)

par Duccio Abbaneo (CERN)

mercredi 29 avr. 2026, 14:00 → 16:00 Europe/Paris

Amphi Charpak

A new detector concept has been developed, with the goal of evolving it into a full detector proposal for FCC-ee. The design emphasizes performance, simplicity, and cost-effectiveness, combining innovative technologies with a coherent and robust overall architecture.

At its core is a full-MAPS tracker, providing excellent spatial resolution with an extremely low material budget, and therefore outstanding tracking and vertexing performance. It is complemented by an ARC detector (Array of RICH Cells), enabling particle identification over a broad momentum range.

The electromagnetic calorimeter is based on the novel GRAiNITA technology, combining excellent energy and position resolution with a significantly reduced cost compared to monolithic crystal calorimeters. In addition, a compact silicon–tungsten sampling calorimeter, also based on MAPS, enables luminosity measurement through the reconstruction of Bhabha events.

These subdetectors are housed inside a superconducting solenoid providing a 3 T magnetic field. Outside the coil, a large dual-readout hadronic calorimeter with an iron absorber ensures adequate hadronic energy resolution while also serving as the magnetic flux return, resulting in an efficient and compact overall design. A simple muon tagging system completes the detector.

The design effort has so far focused on the tracker, reaching a level of detail sufficient for a reliable estimate of the material budget - the key driver of tracking performance. The results demonstrate that an optimized all-MAPS tracker is a valid option for FCC-ee physics, combining excellent performance, robustness, and scalability.

The presentation will introduce the overall detector concept and discuss the tracker design and performance in more detail.