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Future Circular Collider Innovation Study

Periodic Reporting for period 2 - FCCIS (Future Circular Collider Innovation Study)

Reporting period: 2022-05-02 to 2023-11-01

To address the many outstanding questions in fundamental physics, including those brought into sharper focus by the discovery of the Higgs boson, there is no scientific instrument yet conceived with power comparable to a particle collider. Reflecting this, the 2020 update to the European Strategy for Particle Physics set an electron-positron collider as the highest-priority facility after the LHC, along with the investigation of the technical and financial feasibility of such a Higgs factory, followed by a high-energy hadron collider placed in the same 100 km tunnel. This two-stage approach offers a bold vision for a new research infrastructure that would maintain European leadership in fundamental science by the end of the 21st century.

The FCC feasibility study focuses on the first stage (tunnel and lepton circular collider) and with the support of the H2020 FCC Innovation Study (FCCIS) design study, will produce a feasibility report in 2025/2026, in time for the next update to the European Strategy for Particle Physics. The project will deliver a conceptual design and an implementation plan for a new research infrastructure, based on a new tunnel with a circumference between 90-100 km and up to a dozen of surface sites.

Although the FCC is a long-term project with a horizon up to the 22nd century, its timescales are rather tight. A post-LHC collider should be operational around the 2040s, ensuring a smooth continuation from the High-Luminosity LHC, so construction would need to begin in the early 2030s. The proposed infrastructure would validate and strengthen the European leadership in science, as well as strengthen the European innovation and industrial capacities, resulting in its increased competitiveness.
- Set up the FCC Feasibility Structure and set up the FCC Collaboration Board, an International Steering Committee, an International Advisory Committee.
- WP2, submitted a technical report describing the baseline layout and the lattice together with workable beam optics. The report includes the achievable performance and what remains to be addressed.
- Placement studies, in the framework of WP3 work, to balance geological and territorial constraints with machine requirements and physics performance suggest that the most suitable scenarios are based on a 91.7 km-circumference tunnel with eight surface sites that could host up to four experiments.
- WP3 and WP5 launched the Mining the Future competition.The 4 winning proposals were presented during a public event.Furthermore the identification of these four winners led to the recent approval of the project “Open sky laboratory” at CERN. The aim is to develop an innovative process to transform sterile “molasse” into fertile soil for agricultural use and afforestation.
- The structure of investments and operation expenses of the FCC-ee has been identified as part of the FCC midterm review that was submitted to the FCC international Scientific Advisory Committee and CERN’s Council.
- Different data for the estimation of the socio-economic impacts have been pulled together by CSIL and CERN, distinguishing by type of benefit while work on identifying the full value chain is ongoing with LSE. Preliminary estimates of the industrial spillover benefits, value of training, public good value, cultural benefit for on-site visitors have been developed for baseline, optimistic and pessimistic scenarios.
- Developed a new visual identity for the project and launch of the new public website under the coordination of WP5. Moreover, launched a dedicated website for the ongoing site investigations (fcc-faisabilite.eu) while also producing a number of infographics in coordination with University of Liverpool.
- TMFS developed a communication strategy for the project that was also updated to cover aspects of local communications with regional authorities in France & Switzerland.
- Organize two dedicated FCC physics workshop in collaboration with University of Liverpool and IFJPN in Poland to document the physics opportunities. Moreover, the research opportunities were published in a dedicated volume of European Physics Journal Plus that was made available as an Open Access document to inform the wider scientific community about ongoing R&D efforts and attract new participants.
- Springer Nature and Overleaf developed an efficient and seamless publication workflow for very extensive and complex manuscripts such as they are typically encountered for conceptual resp. technical design reports (CDRs / TDR). These tools were tested for the production of the FCC midterm review report (a 700 page document).
- TMFS developed an engagement plan based on the previous communication strategy. In addition, a local communication strategy for informing the affected municipalities in both French and Switzerland as well as contacts with regional and local authorities have been established.
- Final event of the Mining the Future competition and develop a follow-up project with the participation of the four shortlisted participants.
- Develop a preliminary governance framework that could inform the launch of FCC as a global project. Continue organizing meetings for attracting new institutes to the FCC collaboration.
Expected luminosity was revisited. Layout was adjusted to 4 IPs to accommodate RF, collimation, and injection/extraction sections. New optics and parameters are maintained in the optics repository.

Impedance budget is constantly being updated as more refined vacuum component designs become available. Collective effects, instability thresholds and luminosity performance taking interplay of impedance and beam-beam effects is being assessed for the new layout.

Develop a diagnostics concept based on an electro-optical setup for bunch-by-bunch measurements of the longitudinal profile and centre of gravity of the bunches. Time-resolved measurements of the horizontal beam size in a dispersive section are proposed as an approach to measure the energy spread. Test (D2.4) prototype diagnostics at the KARA accelerator (KIT)

Has established interfaces with regional industrial partners (partners EdG and DRRT-AuRA), stakeholders of different interest groups and host-state notified bodies, to discuss the potential local effects of the project construction and long-term operation in the region, and develop regional development scenarios together.

Established a dedicated work package in charge of developing the financial model of the FCC-ee project. The data and estimates produced by the FCCIS project participants helped in creating a detailed costing model for FCC-ee as well as different funding scenarios.

Presented an updated version of the Code of the Universe photography traveling exhibition and works in the preparation of a new website.

Organized the second EIROForum workshop in collaboration with ESA in Paris. The forum brought together key players from all European Big Science RIs and policymakers to identify ways to monitor the impact of RIs. The proceedings of this work will be published in Springer Nature’s Science Policy Reports in 2024.

Developed material for local/regional communications for the upcoming site investigations and public consultation meetings that took place in 2022/2023.

Launch press event for local press and national press from France and Switzerland.

Successfully writing of the FCC feasibility study report, largely informed by the work of WP2, WP3, WP4 and WP5.
Représentation artistique du tunnel pour le FCC-ee
Carte montrant le tracé favorisé pour le FCC
Mesures géodésiques en cours pour l'étude de faisabilité FCC
Modélisation d'un plan de coupe du tunnel pour le FCC-ee
Représentation artistique du tunnel pour le FCC-hh
Enquête environnementale sur le terrain pour l'étude de faisabilité FCC