https://doi.org/10.1140/epjti/s40485-025-00117-3
Research Article
Status of the FCC-ee interaction region design
1
Laboratori Nazionali di Frascati, INFN, Frascati, Italy
2
INFN, Sezione di Pisa, Pisa, Italy
3
CERN, Geneva, Switzerland
4
INFN, Sezione di Perugia, Perugia, Italy
5
University of Rome “Sapienza”, Rome, Italy
6
University of Freiburg, Freiburg, Germany
7
Niels Bohr Institute, Copenhagen, Denmark
8
University of Liverpool, Liverpool, UK
9
University of Zurich, Zurich, Switzerland
10
Paul Scherrer Institute, Villigen, Switzerland
11
SLAC, Menlo Park, USA
12
University of Geneva, Geneva, Switzerland
13
Brookhaven National Laboratory, Upton, NY, USA
14
Fermilab National Laboratory, Batavia, USA
Received:
16
April
2025
Accepted:
7
July
2025
Published online:
1
August
2025
This paper presents a comprehensive overview of the Machine Detector Interface (MDI) design developed for the FCC-ee Feasibility Study. It highlights novel studies related to the lightweight interaction region, including a mechanical model of the vacuum chambers, integration of the vertex detector, the MDI alignment system, and assessments of machine-induced backgrounds. The small beam pipe radius and thickness, as well as the high power to be dissipated, require state-of-the-art mechanical design. The integration of all mechanical elements and detectors is challenging, necessitating careful studies to allow fulfilling conflicting requirements. The optimisation of the machine detector interface against formidable backgrounds is presented.
Key words: Electron-positron collider / Machine-detector interface / Beam-induced backgrounds / Mechanics / Tracking and vertex detectors / Calorimeters
© The Author(s) 2025
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