The development of the power transmission and distribution network for the Future Circular Collider (FCC) involves the integration of advanced technologies aimed at improving efficiency, reliability, and resilience. Smart systems for real-time control of power flows and voltage regulation enable optimized energy management, reduce losses and ensure grid stability under varying conditions,...
The collider beam optics (GHC) has been updated since FCC Week 2024 including several changes: longer $L^*$, smaller $\beta_x^*$ (Z), higher horizontal chromaticity (Z), longer space for the RF (Zh/$t\overline t$), wider beam separation in the technical straight, installation of vertical depolarization bump (Z/W), etc. The resulting luminosity and beam lifetime basically kept unchanged.
OpenSkyLab was established in 2024 on a 1 hectare field near LHC P5 to develop the potential for valorizing molasse-based excavation materials as functional soils. This initiative involves a multidisciplinary team of soil scientists, agronomists, geologists, biologists, and civil engineers.
The objective is to develop, under controlled conditions, the transformation of representative...
The contribution proposes an integration study of a hydrogen infrastructure distributed in the 8 connection points of the FCC. It considers the main constraints linked to the sizing of the system as well as the use of renewable electrical production placed locally and remotely to ensure partial energetic autonomy. It includes technical and economic indicators such as the actualized total...
This talk gives an overview on the FCC-ee studies enabled by the development of the Xsuite beam-beam model. A summary of ongoing projects and a review of the computational needs and challenges are presented.
Cryogenics, electrical network and cooling & ventilation faults accounted for nearly 30% of LHC down time in 2015-2025. Extrapolation to equivalent systems in the FCC-ee suggests a similarly high contribution, posing a substantial challenge to achieving the ambitious availability targets for this large and complex machine. This presentation illustrates key statistics from infrastructure faults...
The Future Circular electron-positron Collider (FCC-ee) is being designed to explore physics beyond the present energy and luminosity frontiers for leptons. To achieve this goal, the FCC-ee must be capable of storing and colliding very high-intensity lepton beams. Handling such intensities poses unique challenges, including the need to safely manage stored beam energies of up to 17.5 MJ. A...
The FCC feasibility study includes the creation of an inventory of environmental aspects of the project as a preparation for the environmental authorisation process. This systematic work includes the compilation of characteristics of all project elements that may have environmental effects, e.g. energy and water consumption, wastes,
wastewater, noise, visibility in the landscape, ionizing and...
So far, measurements of the Higgs boson's coupling to the electroweak gauge bosons, the third-generation massive fermions and the muon have confirmed the predictions of the Standard Model. However, the Yukawa couplings of the electron and the first and second generation quarks remain experimentally elusive due to their smallness and, in the case of the quark couplings, the difficulty of...
This presentation outlines the ongoing developments in the RF straight sections located around points H and L, with a particular focus on the new designs of the 400 MHz and 800 MHz cryomodules, including the rationale for their specified dimensions. Integration studies are being carried out with careful consideration of spatial constraints, all within the 5.5 meters internal diameter of the...
A major project such as the FCC-ee, with a circumference of 91.17 km, presents numerous challenges to guarantee the stability and performance of the machine. As part of the efforts to optimize energy consumption during its operation, the use of Nested Magnets has been explored as a potential method to reduce synchrotron radiation. This talk will address the challenges and solutions associated...
The Future electron-positron Circular Collider, FCC-ee, is a proposed next collider aiming, to provide unprecedented luminosities at beam energies ranging from 45.6 up to 182.5 GeV. One of the major challenges is delivering the ambitious design performance in the presence of realistic misalignment and field errors. A commissioning strategy has been developed including dedicated optics designs,...
In order to commence the civil engineering for the FCC in early 2033,contracts for construction of the necessary civil engineering will need to be put in place in mid-2032. To achieve this challenging milestone, a series of sequential activities needs to take place in order that a robust and largely frozen set of requirements and associated civil engineering designs are available to take...
This presentation offers a feedback on the public participation approaches implemented as part of the feasibility study for the Future Circular Collider (FCC) in France and Switzerland. It will present the tools and methods used on both sides of the border to inform and engage citizens and local stakeholders. The presentation will highlight the differences in institutional and cultural...
The ambitious design goals of the Future electron-positron Circular Collider (FCC-ee) demand excellent orbit and optics control and, therefore, set strict limits on alignment tolerances. One approach to relax the mechanical alignment tolerances is Beam-Based Alignment (BBA), where corrector magnets steer the beam towards the magnetic centre. One of the key challenges of FCC-ee is developing an...
The performance of the Future Circular Collider - electron-positron (FCC-ee) relies critically on the precise alignment of its Interaction Region (IR) components. Small misalignments can significantly degrade the dynamic aperture and luminosity, demanding stringent control of mechanical tolerances. This study uses detailed tuning simulations developed in pyAT, to determine the acceptable...
The Future Circular Collider (FCC) is envisioned as the next-generation particle accelerator, requiring an underground tunnel approximately 90 km in length. Given the significant scale of this infrastructure, a detailed understanding of the subsurface is critical for reducing geological and geotechnical uncertainties. This abstract provides an update on the recent progress made through the...
The FCC-ee low-energy machine, operating at 45.6 GeV, is the most affected by the collective effects because of the lowest beam energy combined with the highest beam current, the lowest emittances and the longest damping times. The design of this machine is still in progress, and the coupling impedance budget is continuously evolving in parallel with the updates of the vacuum chamber...
This presentation discusses the various collective instabilities that arise in the FCC-ee at Z energy. Intensity limitations in both the vertical and horizontal planes are influenced by the combined effects of beam-beam interactions and impedance. In the vertical plane, the transverse mode repulsion instability, driven by impedance, is a limiting factor, while in the horizontal plane, the...
The FCC-ee may face significant challenges related to electron cloud effects. These effects are expected to be most pronounced in the Z configuration, due to the highest number of bunches, which leads to the smallest bunch spacing, which is a key parameter in the e-cloud formation process. A high electron density within the beam pipe can limit accelerator performance through several...
Xsuite enables detailed beam dynamics simulations including full lattice descriptions, synchrotron radiation, lattice errors, corrections and beam-beam effects. In this work we explore the interplay by these effects by systematically combining individual effects to produce and understand comprehensive simulations and complex behaviour. We also explore different dynamic indicators including...
We will summarize the arc magnet designs proposed for the GHC optics baseline in the Feasibility Study Report, and compare it with alternative designs for the LCC optics. We will conclude with an overview of the collider magnet work plan for the Pre-TDR phase.
This presentation reviews recent progress in the design of the high energy booster magnets. We will summarize the proposed designs of the main arc magnets — dipoles, quadrupoles, and sextupoles — from the feasibility study report. Results from magnetic measurements of a short prototype dipole will be presented, highlighting implications for low-field performance. Finally, we will outline...
Go to the event page for more information incl. slides: https://indico.cern.ch/event/1507998/
Go to the event page for more information incl. slides: https://indico.cern.ch/event/1507998/
The high-luminosity circular collider FCC-ee will need a low-emittance positron beam with high enough intensity to shorten the injection time. In particular, operation at the Z-pole demands a positron bunch intensity of $2.14\cdot10^{10}$ particles at injection into the collider rings. The baseline design for positron production relies on a conventional source, where a 2.86 GeV electron beam...
Permanent magnets and conventional electromagnets were studies as candidates for the FCC-ee transfer lines. The preliminary 2D design was performed to evaluate the engineering parameters and cost for both options. The results were discussed and the electromagnets have been approved as a base line due to their capability of the magnetic field adjustment in a wide range, that is an important...
Go to the event page for more information incl. slides: https://indico.cern.ch/event/1507998/
Go to the event page for more information incl. slides: https://indico.cern.ch/event/1507998/
The SRF R&D project was launched in 2023, with the purpose to introduce a more detailed structure, coordination and progress reporting of the SRF R&D activity which is taking place since several years at CERN. More recently, the project was renamed as SRF R&D-R, to distinguish it from the twin SRF R&D-D, which is focused on producing demonstrators for the FCC. The overarching purpose of the...
The goal of FCCee, high energy and luminosity collisions, imposes technical challenges to the SRF cryomodules. To cope with high current e+/e- beams with relatively high accelerating gradients, one needs to achieve an extremely high-quality factor in accelerating mode while efficiently damping other modes. The former can be achieved by niobium cavities with dedicated heat treatment and the...
Go to the event page for more information incl. slides: https://indico.cern.ch/event/1507998/
The design of the FCC-ee injector linacs for the FCC feasibility study will be briefly summarized including electron and HE-linacs at 2.8 GHz and positron linac at 2 GHz. Then possible design choices and the RF frequency choices in the linacs for the TDR phase will be discussed towards using the standard European S-band RF frequency of 3 GHz.
Go to the event page for more information incl. slides: https://indico.cern.ch/event/1507998/
CERN now possesses both the tools and expertise required to electropolish 400 MHz copper elliptical cavities. This contribution provides a brief overview of the electropolishing setup, the associated interfaces, and the simulation efforts undertaken to design the system and optimize the process. A comparison between simulation data and results from actual processing will be presented and...
The Future Circular Collider – electron-positron (FCC-ee) demands an ultra-high vacuum environment to reach its ambitious performance targets. At the heart of this vacuum system lies a deceptively simple yet critically important component: the bake-out system. Its role? To activate and regenerate the Non-Evaporable Getter (NEG) coating inside the vacuum chamber through a high temperature...
The FCC-ee injector complex aims to deliver tunable, high-charge electrons and positron bunches for injection into the booster ring first and the final collider ring. The injector complex includes multiple linacs that sequentially boost the energy of the bunches to the booster injection energy of 20 GeV. This work addresses the significant challenges posed by the required beam parameters. We...
We demonstrate transfer learning capabilities in a machine-learned algorithm trained for particle-flow reconstruction in high energy particle colliders. This paper presents a cross-detector fine-tuning study, where we initially pre-train the model on a large full simulation dataset from one detector design, and subsequently fine-tune the model on a sample with a different collider and detector...
Go to the event page for more information incl. slides: https://indico.cern.ch/event/1507998/
The Electron-Ion Collider (EIC) under construction at Brookhaven National Laboratory is being developed in partnership with the U.S. Department of Energy’s Thomas Jefferson National Accelerator Facility. The EIC will deliver high-luminosity, variable center-of-mass energy collisions of highly polarized electron beams with highly polarized proton beams and ion beams. Superconducting...
During this presentation, we will give an overview of the main features of the FCC-ee booster This presentation will also resume the main changes in the parameter tables, optics, tuning, and booster operation.
Go to the event page for more information incl. slides: https://indico.cern.ch/event/150799
This presentation will cover the latest status of the accelerating cavity designs for the FCC-ee main collider and booster, taking into account reverse phase operation. It will include the 2-cell 400 MHz cavities developed for the Z, W, H modes and part of the voltage needed for the tt̄ collider, as well as the 6-cell 800 MHz cavities designed for the tt̄ collider and booster. Each working...
Go to the event page for more information incl. slides: https://indico.cern.ch/event/150799
Novel cooling schemes for SRF cavities are under study in the Cryolab at CERN aiming to improve cooling performance of the cavities in terms of heat transfer, lowering cooling source influences and improve cooldown behavior esp. at the transition temperature of the superconducting material. The studied options of integrated channel cooling are currently applied to 1.3 GHz coated copper...
Go to the event page for more information incl. slides: https://indico.cern.ch/event/150799
Previous studies for the FCCee have highlighted the need to define tolerances on magnet imperfections and develop correction strategies. This is also crucial for ensuring the performance of one of the main elements in the acceleration chain: the High Energy Booster (HEB) ring.
The efficiency and overall performance of the correction strategy, as well as the magnet field quality and...
800 MHz SRF cavity and cryomodule developments at FNAL towards FCC have been progressing through active and fruitful collaboration with CERN colleagues. With the recently published FCC Feasibility Study Report, the 800 MHz systems have changed from 5-cell to 6-cell bulk Nb cavities, and employ 112 cavities in 28 cryomodules for the booster up through the ZH operating point. At the ttb...
Go to the event page for more information incl. slides: https://indico.cern.ch/event/150799
Go to the event page for more information incl. slides: https://indico.cern.ch/event/150799
To address the challenges of helium and energy consumption in next-generation particle accelerators such as the Future Circular Collider (FCC), it is essential to reduce the demands placed on cryogenic infrastructure. This has spurred a growing interest within the scientific community in advancing technologies that support operation at temperatures above 2 K. Within this framework,...
Go to the event page for more information incl. slides: https://indico.cern.ch/event/150799
Go to the event page for more information incl. slides: https://indico.cern.ch/event/150799
Go to the event page for more information incl. slides: https://indico.cern.ch/event/150799
Go to the event page for more information incl. slides: https://indico.cern.ch/event/150799
Go to the event page for more information incl. slides: https://indico.cern.ch/event/150799
Go to the event page for more information incl. slides: https://indico.cern.ch/event/150799
This presentation summarizes the results of the 3D integration studies carried out in the frame of the FCC feasibility study. The 3D integration have been carried out with careful consideration of spatial constraints with respect to the updated requirements provided by the different stakeholders, such as civil engineering, cooling circuits, HVAC systems, electrical supply, transport, safety...
The talk will give an overview of the MDI-related ongoing studies with an outlook on the prospects and goals for the next pre-TDR phase.
The status of the R&D on the IR mockup will also be reported, with first cooling tests on the Aluminium central chamber prototype.
The FCC-ee accelerating cavities need reliable power couplers to deliver high RF power across different operation modes. This presentation will cover the design of a 400 MHz coupler for the collider cavities, capable of delivering around 400 kW with a Qext adjustable between 9×10⁵ and 5×10⁶, for Z, W, H, and top-quark (tt̄) operation. It will also present the design of an 800 MHz coupler for...
The FCC-ee arc half-cell mock-up project is about to enter the installation phase, as the first elements of the mock-up structure have been received and most of the components to be installed have been ordered. The mock-up is designed to be modular, enabling it to accommodate systems from other teams: robots, magnets, vacuum systems, etc. Extensive collaboration with other teams has taken...
In this contribution we report on recent advancements of the HNFS project for the transverse beam diagnostics of FCC-ee. The project aims at developing novel nanostructured targets to monitor the full 2D beam profile with the Heterodyne Speckle technique. We will present preliminary numerical and experimental results concerning the target design, prototyping and testing, as well as the current...
The combination of high energies, high intensities, and very low emittances of electron and positron beams at the FCC-ee offers an extraordinary possibility of making a unique $\gamma$-source. This involves using a novel technique, which in addition allows one to operate such a source concurrently with the nominal $e^+e^-$ collisions.
Using a low-energy ERL beam with short bunches, the...
The Interaction Regions (IR) for the FCC-ee collider as envisioned by the CERN FCC Feasibility Study requires a variety of superconducting correction coils that must be integrated with the main IR focusing quadrupoles. The design of corrector magnets takes advantage of BNL’s Direct Wind coil technology to essentially print multiple nested corrector layers, with small diameter superconductor...
The FCC-ee IR general layout has a compact architecture, designed to respect multiple constraints given by the physics and mechanics of the experiment. To do this, a specific integration study of the vertex detector and central beam pipe services has been launched: it involves 3D printed support with internal air channels and others lightweight structures used both to support the inner vertex...
Following the completion of the FCC feasibility study, we present the baseline design of the FCC-hh collider as established in the final report. Key developments include updated arc cell configurations with reviewed corrector systems, increased dipole filling factor, and revised layouts for technical and experimental insertions within the shared tunnel infrastructure. We also highlight...
The electron-positron Future Circular Collider (FCC-ee) is a proposed high-energy lepton collider that aims to reach unprecedented luminosity and precision in the measurement of fundamental particles. To fully exploit this potential, it is crucial to keep machine-induced detector backgrounds under control to ensure safe operation and optimal detector performance. Due to the high stored beam...
The Future Circular electron-positron Collider (FCC-ee) is being designed to explore physics beyond the present energy and luminosity frontiers for leptons. To achieve this goal, the FCC-ee must be capable of storing and colliding very high-intensity lepton beams. Handling such intensities poses unique challenges, including the need to safely manage stored beam energies of up to 17.5 MJ. A...
CERN’s next generation hadron collider, the Future Circular Collider (FCC-hh) will achieve an increase in center-of-mass collision energies of a factor seven when compared to the Large Hadron Collider (LHC), reaching 100 TeV. To handle the higher energy levels of the orbiting particle beam and shield the magnet cold bore from the synchrotron radiation produced by the accelerated charged...
The high beam energies and intensities foreseen at FCC-ee pose significant challenges in terms of radiation environment. To support the design of the machine-detectore interface and ensure the long-term reliability of sensitive systems, a detailed FLUKA model of the interaction region has been developed to predict both component radiation load and tunnel radiation levels. This talk presents...
Thallium-based cuprates, particularly Tl-1223, are of significant interest due to their high critical temperature (~120 K) and their potential for applications in extreme environments. In this study, nearly pure Tl-1223 superconducting films were successfully synthesized by laser ablation or electrochemical deposition to deposit precursors onto single-crystal or texturing templates, followed...
In the framework of the Future Circular Collider (FCC) study at CERN, a conceptual design of a cooling scheme for Nb$_3$Sn-based accelerator magnets operating at 4.5 K is proposed for the FCC-hh configuration. This alternative, at a higher operating temperature than the baseline at 1.9 K using Helium II, is driven by the efforts towards a more energetically sustainable machine, while ensuring...
To achieve physics performance at the Future Circular electron-positron Collider (FCC-ee), luminosity and beam lifetime must be maintained at close to design specifications.
Alongside global feedbacks, a fast feedback system is proposed to mitigate beam offset errors at the interaction points (IP), caused by magnet vibrations or other time-varying errors.
To identify the performance...
We present current results of electromagnetic calculations of the interaction of a high-intensity beam field with the metallic walls of the FCC-ee vacuum chamber of the Interaction Region. This interaction creates a thermal load on the beam pipe walls, which leads to the destruction of vacuum conditions and a possible increase in background. We calculated the thermal load for the proposed...
Ensuring a credible, feasible and sustainable safety response for the FCC requires planning for complex emergency situations. This presentation outlines a layered response concept involving self-sufficient workers, robotic support, AI-assisted monitoring, and human emergency responders. It reflects ongoing collaboration between the Safety WP, CFRS and robotics experts. The focus will be on...
High-precision center-of-mass energy calibration at the Future Circular Collider e⁺e⁻ (FCC-ee) relies on sufficient transverse beam polarization for resonant depolarization measurements. Simulations have been performed to assess the achievable polarization levels in the presence of machine imperfections. Harmonic spin matching techniques have been explored to enhance polarization. The impact...
The ventilation system for the FCC is designed to supply, condition, and extract air throughout the entire accelerator complex. This includes the Technical Areas, Experimental Areas, RF Areas, the Tunnel, and surface buildings. The supplied air must comply with safety, humidity, and temperature standards. This presentation will provide an overview of this system, with a focus on the updated...
FCC-ee requires a collimation system to isolate unavoidable beam losses and reduce particle backgrounds in the detectors, and to protect the machine in case of excessive beam losses from unstable or mis-steered beams at stored energies of 17.5MJ. The system is composed of primary and secondary collimators for betatron and momentum collimation, which will be located in one of the technical...
The water-cooling systems of the FCC are designed to remove the heat generated by critical components such as magnets, cryogenic systems, absorbers, and electronics. This presentation will provide an overview of the current design status of these systems, highlighting updates on the thermal loads managed by the cooling systems, comparisons of various cooling tower technologies, strategies for...
This presentation introduces the concepts of magnet and circuit protection of the FCC-hh, focusing on the main dipole magnets. For the baseline case of 14 T Nb3Sn magnets, magnet protection is preferably provided by ESC, and eventually quench heaters to cover the low current regime, combined with cold by-pass diodes.
For the case of 14-20 T HTS magnets, a similar protection strategy is...
A novel CO₂-based architecture to recover, transport, and utilise surplus thermal energy across eight distributed sites is proposed as The Waste Heat Supply System (WHSS) for the Future Circular Collider (FCC).
The WHSS applies CO₂ in pressurised pipelines to transfer heat to decentralised heat pump - chiller units, where heat is delivered to end users and the CO₂ is liquefied.
Key...
Managing radiation from primary synchrotron photons is a major design challenge for the FCC-ee, as prolonged exposure can degrade tunnel infrastructure and critical machine components. Effective shielding is therefore essential, not only to protect equipment and maintain operational reliability, but also to minimize the need for costly radiation-hardened materials.
The current shielding...
Properties of High Temperature Superconductors (HTS) make them unique for both high field and higher temperature (> 4.2 K) applications. While their potential for future accelerators is undeniable, the route to high field magnets requires development and innovation via a targeted and focused research and development programme. Synergy with other on-going HTS projects is important and highly...
CERN and CEA Paris-Saclay are collaborating in the framework of the HFM (High Field Magnet) project.
One part of the program is to develop $Nb_3Sn$ magnets generating a 14 T operational field, as a baseline for a future high-energy collider. Following some experience acquired in the previous collaborations, CEA has proposed a development plan for block-coil magnets. The goal is to design,...
CIEMAT is contributing to HFM Programme by means of common coil magnets. ISAAC is the first step, a model magnet made using existing RMC coils produced by CERN. Mechanics is based on a low preload concept. As a second step, we have explored the space design of common coil magnets providing 14 T in a 50 mm aperture at 1.9 K. We have found very promising results for hybrid magnets using Nb3Sn...
The stored beam energy of FCC-ee will reach 17.5 MJ per beam during the Z-mode operation at 45.6 GeV. Due to the very small beam emittances, the resulting extremely high energy densities pose a significant risk of damage to collider components in case of failures leading to beam impact. This study investigates the criticality of powering failures in the main dipole circuits. The time-dependent...
The Future Circular Collider (FCC) demands an unprecedented scale of magnet production, with nearly 25,000 components for both the collider and booster requiring tightly coordinated manufacturing and installation. This presentation outlines the production and logistics strategy.
To explore physics beyond the capabilities of the LHC and its High-Luminosity Upgrade (HL-LHC), particle physicists are aiming for higher-performance accelerators that allow more precise measurements or operate at higher energies and intensities. The last update of the European Strategy for Particle Physics highlighted the urgent need for enhanced research and development on advanced...
As part of the FCC feasibility study, the installation schedule for the FCC-ee has been aligned with the updated Civil Engineering strategy for the tunnel construction. Fine tuning between the two schedules was carried out to optimize the overall installation duration, allowing machine installation activities to safely begin while the final phases of Civil Engineering works are still being...
Stored energies in the FCC-ee colliding ring are expected to be just below 20 MJ for the Z-pole configuration - still one order of magnitude below that of the LHC. However, due to the extremely small vertical beam size, the beam energy density remains high enough to pose a risk of damaging the accelerator. A beam loss system must therefore be capable of detecting losses quickly enough to...
Because of the strong beam-beam force at the interaction points in FCC-ee, the charge balance of two beams opposing each other is vitally important.
The injection of a high charge beam derives the imbalance of two beams, which causes the instability of the beams.
To avoid this imbalance, the bootstrapping injection has been adopted for the FCC-ee collider.
The conditioning of the...
The Geneva Basin consists of a variety of geological formations, including Mesozoic limestone, Cenozoic Molasse, and Quaternary moraines. A 3D ground model has been developed using existing geological data; however, significant uncertainties remain in several areas along the proposed FCC tunnel alignment due to the limited extent of previous site investigations.
This poster summarises...
The accelerator at the FACET-II National User Facility at SLAC National Accelerator Laboratory can test several elements of the design of the FCC-ee injector. To support the design of the injector we propose three experiments: measurement of emittance growth as a function of compression at high charge, characterization of jitter amplification of high-charge beams in s-band linacs at 25 ns...
The electron-positron Future Circular Collider (FCC-ee) has challenging requirements for beam instrumentation, including the need for thousands of high-resolution beam position monitors (BPMs) presenting low impedance to the circulating beam. This poster details the requirements for the FCC-ee arc BPMs and presents the simulation results of BPM button pickups with various geometries, modelled...
Environmentally friendly detector refrigeration solutions for the FCC, inspired by ongoing LHC detector refrigeration research
In order to guarantee the foreseen lifetime operation of the FCC and its related experiments, environmental impact and machine performance are key elements to be considered, at a technical efficiency level as well as a global political level. New governmental...
We study the potential of the FCC‑$ee$ to perform time-dependent $CP$ violation measurements in rare decays $B_s^0 \to \phi(\to K^+K^-)\mu^+\mu^-$ at the $Z$-pole, where large statistics can be achieved. These decays serve as sensitive probes for physics beyond the Standard Model (SM). In the SM, $CP$ violation enters only through loop processes and is therefore highly suppressed, so any...
Abstract
The FCC-ee at √s = 365 GeV provides a better environment to study Higgs boson production with high precision. This study focuses on single Higgs production via vector-boson fusion (VBF) and associated production (ZH), followed by its Η → WW → 2 l + MET decay. Using MadGraph5, event generation was performed for e⁺ e⁻ → νl νl~ H and e⁺ e⁻ → Z H. Parton-level events...
The LHC constitutes the first and currently only opportunity to perform precision measurements of $\Lambda_b^0$ baryons. These measurements provide useful information on flavour physics which complements the meson sector. Baryons stemming from the strong production mechanism at the LHC are unpolarized. At the FCC-ee however, the baryons are produced in the decay of $Z^0$-bosons which can lead...
The FCC holds a great opportunity for the discovery of dark matter. By achieving energy scales and collision frequencies surpassing the LHC, the FCC is expected to open new avenues for exploring candidate dark matter particles. The composite dark matter models are possible candidates for dark matter in the FCC. We focus our research on the composite dark matter models based on QCD-like...
Several key observables of the high-precision physics program at FCC-ee will critically depend on the knowledge of the absolute machine luminosity. The determination of the luminosity relies on the precise knowledge of some reference process, which is in principle not affected by unknown physics, so that its cross section can be computed within a well-established theory, like the Standard...
The efficacy of superconducting radio-frequency cavities in particle accelerators is predicated upon the quality of thin niobium films deposited onto complex copper substrates. Conventional direct-current magnetron sputtering (DCMS) often yields sub-optimal, porous columnar morphologies on intricate 3D geometries due to line-of-sight limitations. High-power impulse magnetron sputtering...
The top quark mass plays a fundamental role in verifying the stability of the Higgs vacuum. A more precise measurement allows us to determine whether the Universe is in a stable state or if it is destined, in the distant future, to decay. For this reason, high-precision measurements of the top quark mass are central to the scientific programs of present and future colliders. One of the primary...
The hadron collider phase of the Future Circular Collider (FCC-hh) is a proton-proton collider operating at a center-of-mass energy of 80-100 TeV. It is one of the most ambitious projects planned for the rest of this century and offers ample opportunities in the hunt for new physics, both through its direct detection reach as well as through indirect evidence from precision measurements.
This...
We investigate the non-standard ν¯ν γγ couplings parameterized by dimension-seven operators through the process e^+ e^-→ν¯ν γ at the FCC-ee. A comprehensive Monte Carlo simulation is performed, where signal and relevant background events are generated within the MadGraph framework, incorporating the non-standard ν¯ν γγ interactions. Subsequent parton showering and hadronization are performed...
The associated production of a Higgs boson with a Z boson decaying into leptons and the Higgs boson mostly decays to b b~ pair can be measured in the high transverse momentum regime of dileptons, ranging 50 - 70 GeV, with the IDEA detector. The recoil mass distributions from the signal (HZ, Z-> l+ l-) and the backgrounds (mainly ZZ, WW and other backgrounds) have been analyzed using the...
We present an overview and update for the {\tt KKMCee 5.00.2} Monte Carlo event generator for lepton and quark pair production in high-energy electron-positron annihilation processes. We note that it is still the most sophisticated event generator for such processes. Its entire source code is rewritten in the modern C++ language and it reproduces all features of the older KKMC code in Fortran...
Calorimeters based on liquified noble gases have demonstrated excellent performance over the past decades in various particle physics experiments, offering good energy resolution, linearity, uniformity, and stability. To achieve the goals of FCC’s ambitious physics programme, future detector technologies must meet stringent performance requirements.
As part of an extensive R&D programme,...
The iron-based superconductor $\mathrm{Ba}_{1-x}\mathrm{K}_x\mathrm{Fe}_2\mathrm{As}_2$ (Ba122), with a critical temperature around 38 K and a very high upper critical field (Hc2), is a promising candidate for high-field magnet applications, including those envisioned in future particle accelerator technologies. In this context, CNR-SPIN and CERN have initiated a joint collaboration—within the...
To achieve the desired experimental outcomes at the FCC-ee, precise control of linear and non-linear optics is essential. Amplitude dependent tune shifts, higher order chromaticity and resonant driving terms (RDTs) are examples of non-linear optics parameters which must be understood and controlled. Two key figures of merit for the collider ring are the dynamic aperture (DA) and momentum...
Measuring the Yukawa couplings of the Higgs boson remains one of the most critical and unresolved tasks since its discovery. The FCC-ee, with its extremely high integrated luminosity, provides a rare chance to probe the electron Yukawa coupling via s-channel Higgs production at a centre-of-mass energy of 125 GeV—on the condition that the energy spread can be reduced from 50 MeV to match the...
Collider rings all around the world need to have several sensors all around the ring to operate. One kind of these sensors is the Beam Position Monitors (BPMs), that allows operators to measure if the beam travelling in their apparatus is well centered in the different magnets.
One specific category of BPMs, standing out by its very high aquisition rate, is called the Turn-by-turn BPMs...
The FCC-ee arc half-cell mock-up project team is currently developing a Short Straight Section demonstrator, combining experimental measurements and simulations to evaluate the vibrational budget of various elements including the feet, the support, the magnets, etc. The results of this study have shown that vibrations will have a non-negligible effect on the stability of the magnet's magnetic...
Although the stored beam energy in the FCC-ee will be lower than in the LHC, the extremely small vertical beam size leads to a high energy density. This poses a risk of damaging accelerator components, making machine protection essential. A Beam Loss Monitoring (BLM) system capable of quickly detecting and localizing beam losses is therefore needed to protect the machine by triggering the beam...
The identification of jets initiated by a strange quark and discriminating them against jets initiated by other flavours of partons is a crucial piece of measuring the Higgs Yukawa coupling to strange quarks. While ML-based taggers have been trained on simulation to provide such simulation, its unclear which features of the simulation they are using in their discrimination and how this might...
The FCC-ee is a collider, proposed after the LHC era, based on a ring of approximately 90 km of circumference. It will have to be able to accommodate beams running at half the z-pole and tt ̅-pole with vertical Interaction point beam size less than 40 nanometer at the z. In the present studies, coherent ground motions are being explored with particle tracking tools such as MAD-X and analytics...
FCC-ee luminosity optimization relies on measuring realistic signals from Bhabha scattering, beamstrahlung, and radiative Bhabha photons. Initial assessments of beamstrahlung signals examine the change in luminosity, beamstrahlung power and vertex detector hits in response to waist shifts, vertical dispersion and skew coupling at the collision point. These ongoing studies aim to extract...
