In view of the FCC feasibility study report, the Safety WP is tasked with the editorial of a Safety Concept. This report will detail all the risks associated with the future activities of the FCC-ee machine during the civil engineering construction, installation and operation phases.
The outcome of the safety concept leans of the results of several safety studies performed by the HSE Unit and...
A summary of a workshop (May 2024) dedicated to QCD physics of relevance for Higgs measurements at the FCC-ee will be presented.
The radiation protection studies shall ensure that the proposed design of FCCee is compatible with the objectives and constraints for radiological protection of the personnel and the environment. An assessment of the radiological parameters, such as the levels of prompt and residual radiation and activation, allows to evaluate their impact during the operation and maintenance of the...
We show that the FCC-ee will have sensitivity to the MSSM electroweak sector that is complementary to the LHC, through the precision Z-boson measurements. Our results provide added motivation and quantitative targets for the desired systematic uncertainty on this measurement.
The availability and safety of the Future Circular Collider (FCC) are critical factors for its operation. To enhance these parameters cost-effectively, the FCC Robotic System (FCCRS) has been conceived and it is under development during the last years. The FCCRS comprises a Remote Maintenance and Inspection System (RMIS) and a Survayance and Emergency Shuttle (SES). This system will...
The talk will provide an overview of the model identified to transport people from the surface to their place of work in the tunnel and vice versa.
The transport concept is currently based on personnel lifts linking the surface to the underground facilities and bespoke automated vehicles running in the accelerator tunnel and the service caverns.
During the presentation, the safety...
The presentation will provide an update on the concepts for the people transport vehicle and the magnet transport vehicle. It will also include new information on the logistics study for the transport and installation of the collider and booster ring in the underground tunnel.
The concept for the people transport vehicle is specifically designed to navigate the narrow tunnel of the FCC. The...
To reach integrated luminosity goals, the FCC-ee must be operational for minimum 80% of the scheduled 185 physics days each year. For comparison, the LHC achieved 77% in Run 2, 2016-2018. There are additional challenges in operation and maintenance of the FCC-ee due to its scale, complexity and ambitious technical objectives. Availability is therefore a significant risk to physics...
This presentation will recap the objectives of the Subsurface Site investigations (SSI) and the scope of the original campaign when it was released to tender in October 2023. It will discuss the results of the tender and detail the amendments to the original strategy based on these results and the availability of new geological data since 2023 and present the provisional programme for the SSI....
Follow up the up-to-date requirements from the different stakeholders (cooling, HVAC, electrical supply, transport, safety systems, and machine systems). The integration team classified and optimized the space which will be used in the underground infrastructure. The 3D integration models were updated with the new occupation requests on the machine tunnel and the arcs, experimental caverns,...
At this stage of the feasibility study of FCC, few challenges were identified, and the electrical network has a role to play in improving them.
Indeed, the study highlighted the need to use as little space as possible: on surface sites to limit the environmental impact, but underground as well to limit the civil engineering cost. In this sense, the electrical network is designed to reduce...
We report on a conceptual design for a noble-liquid-based EM endcap
calorimeter, where the absorber plates and readout electrodes are
arranged in a turbine-like geometry. This design allows for
frequent shower sampling and highly granular readout, without
introducing cracks in phi. Furthermore, it can be constructed from multiple
copies of a small number of absorber and readout board...
Following the priority research directions for calorimetry documented in the DOE HEP basic research needs for instruments the Caltech HEP Crystal Lab has been actively investigating novel inorganic scintillators along the following three directions. Fast and radiation hard inorganic scintillators to face the challenge of severe radiation environment expected by future HEP experiments at hadron...
The CERN proposed $e^+e^-$ Future Circular Collider (FCC-ee) is designed as an electroweak, flavour, Higgs, and top factory with unprecedented luminosities. Many measurements at the FCC-ee will rely on the precise determination of the vertices, measured by dedicated vertex detectors, and the Silicon Wrapper at about two meters in radius, improving momentum resolution, providing precise angular...
We will present the update of the magnet parameters resulting from the global optimization of the magnet circuits carried out this year in collaboration with our colleagues of the CERN power converter group. We will show how the magnet cross sections have consequently evolved and list the next steps for the magnet development until the end of the feasibility study and beyond.
Update on the design of the high energy booster magnets. We will cover:
- developments on the low field dipole, a key factor in defining the injection energy for the booster.
- parameters and cross sections of magnets to meet the requirements of the v.24 HEB optics baseline.
- early results factoring the global optimisation in collaboration with CERN power converter group.
800 MHz bulk niobium superconducting RF cavities are a fundamental, and sizeable, component of the FCC machine at all operating points. In the Booster, for Z, W, H, and ttbar operating points, there are 24, 56, 112, and 600 of these cavities respectively, with an additional 488 in the collider ring for ttbar operation. The FCC cavity performance specifications currently sit at the upper limit...
We present the results of the wake field analyses for different geometries of the IR beam pipe elements like bellows, BPMs, SR mask including beam pipe shape. We found a possibility how to decrease and capture wake fields generated by colliding beams in the interaction region. This optimization study will be useful for the FCC-ee IR beam pipe design.
The FCC-ee arc half-cell mock-up project is continuing its engineering design phase and entering the manufacturing, installation, and testing phase. The production of a 1:1 scale mock-up has been launched and the installation of the first version is scheduled for Q1 2025. The main idea is to have a modular mock-up that can accommodate systems from other teams: robots, magnets, safety systems,...
Following up the updates on RF section studies, where we have a new design of the 400MHz and 800 MHz cryogenics modules. The integration studies are considering boundaries in term of space limitations and design requirements, such as underground infrastructures (access shaft, connection tunnels, etc.), straight section length, cryogenics modules length, general services (electrical, cooling...
The RF systems of the FCC-ee are expected to be the primary consumers of power and energy. With an estimated power consumption exceeding 100 MW, it is crucial to design an efficient and reliable powering system that can deliver power from the AC network to the klystron gallery.
A critical component of the RF powering system is the main power converter. The use of a centralized high-voltage...
The Future Circular Collider electron-positron (FCC-ee) is a proposed high-energy lepton collider that aims to reach unprecedented precision in the measurements of fundamental particles. However, several beam related processes produce particles in the Machine-Detector Interface (MDI) region, which can adversely affect the measurements' accuracy. This contribution presents a study of the...
For injection, extraction and beam disposal fast pulsed systems are needed throughout the FCC-ee complex. This presentation outlines the various kicker systems needed to transport the lepton beams from the electron source up to the collider dump system. The individual system requirements are presented, and the choice of design parameters and technology options for both beamline elements and...
The ventilation system of the FCC includes the supply, treatment, and extraction of air in the accelerator complex, including the Arc Tunnel, Alcoves and the caverns and galleries in the Experimental, RF and Technical Points. The air supplied at the FCC must meet safety, humidity and temperature requirements, among others. The ventilation system is also used to extract part of the thermal load...
The Electron-Ion Collider (EIC) is an advanced particle accelerator designed to explore matter's fundamental structure at the subatomic scale. It collides high-energy polarized electron beams with ions, like protons or lead nuclei, enabling scientists to scrutinize quark and gluon interactions. The EIC's unique setup provides a platform to study these interactions within atomic nuclei,...
In recent years, with the advent of power electronics, DC networks have emerged as a promising solution for the distribution of electrical energy. They offer advantages in terms of efficiency, controllability, volume reduction, and integration of energy storage. Given the specific needs of the FCC, DC networks could be utilized to supply power to specific machine components.
On a larger...
Experiments at the future Electron-Ion Collider (EIC) pose stringent requirements on the tracking system for the measurement of the scattered electron and charged particles produced in the collision, as well as the position of the collision point and any decay vertices of hadrons containing heavy quarks. Monolithic Active Pixel Sensors (MAPS) offer the possibility of high granularity in...
OBELIX is a depleted monolithic active pixel sensor developed for the Belle II experiment at the SuperKEKB $e^+e^-$ asymmetric energy collider designed to cope with high particle fluence. The proposed upgrade of the Belle II Vertex Detector (VTX) will use OBELIX sensor on all its 5 layers. The sensor is based on the TJ-Monopix2 design, fabricated in a radiation hard CMOS 180 nm...
We will present the latest developments and plans in the Fermilab group on the development of precision tracking detectors for FCC-ee applications. Efforts have been focused on advances towards manufacturing of novel sensors and on the design of sophisticated Application Specific Integrated Circuits (ASICs) required to achieve the ambitious goals of FCC-ee. We will present developments over...
We propose to conduct research and development on a straw tracker that can be used as an inner tracker for the FCC-ee. The straw tracker offers the advantage of a low material, a crucial factor in minimizing overall inner detector material budget. With the capability to achieve a single-hit resolution of approximately 120 microns per layer, and the potential for up to 100 layers, the straw...
Low gain avalanche detectors (LGADs) fabricated by Hamamatsu Photonics KK (HPK) and Fondazione Bruno Kessler (FBK) have been evaluated for performance before and after exposure to gamma and proton irradiation. LGADs promise excellent timing resolution, which can mitigate the pileup associated with high luminosity at hadron colliders. Their timing information can also be used to distinguish...
The precise identification of jets originating from high-energy quarks and gluons is paramount for advancing our understanding of fundamental particles and forces. This study introduces a novel deep learning framework designed to probe the limits of jet classifier models by using generative AI. State-of-the-art generative models called diffusion neural networks are used to create synthetic...
In the past few years, the Low Gain Avalanche Detector (LGAD, thin silicon detectors with modest internal gain and extremely good time resolution) technology have been significantly advanced. The first application of this kind of device will be in the ATLAS and CMS timing layers at the HL-LHC. The first prototypes of LGADs produced few years ago within the collaborations did not show...
The pure gravity mediation model based on anomaly-mediated supersymmetry breaking is among the well-motivated models consistent with the large Higgs mass and the non-observation of supersymmetry at the LHC so far. We focus on a scenario where all the gauginos, including the neutral Wino which is the lightest supersymmetric particle, are within the kinematical reach of the FCC-hh, and study the...
The Standard Model predicts neutrinos to be massless but the observation of neutrino flavor oscillations implies that they are massive particles.
The type I see-saw mechanism has been extensively studied as a promising model of neutrino mass generation in which the existence of right-handed heavy neutrinos (also called heavy neutral leptons, HNLs) is needed to counterbalance the mass of the...
The planned LUXE experiment at DESY in Hamburg (Germany) stands at the forefront of the investigation into strong-field quantum electrodynamics with high precision. The interaction between electrons or photons and a high-intensity laser generates new electrons, positrons, and photons. The phenomena under examination include non-linear Compton scattering, non-linear Breit-Wheeler pair...
We systematically study potential effects of BSM physics in the e+ e- -> Z H process. To this end we include dimension-6 Standard Model Effective Field Theory operators and work to NLO accuracy in the electro-weak coupling. To capture the full breadth of potential signatures we include virtual and radiative corrections fully-differential, as well as consider polarized and unpolarized electron...
The software description of the ATLAS detector is based on the
GeoModel toolkit, developed in-house for the ATLAS experiment but
released and maintained as a separate package with few dependencies.
A compact SQLite-based exchange format permits the sharing of
geometrical information between applications including visualization,
clash detection, material inventory, database browsing,...
Particle detectors for future colliders rely on ever more precise charged particle tracking devices, which are supported by structures manufactured from composite materials. The higher luminosity and higher radiation environment present challenges to support structures and cooling of the detectors. An integrated engineering approach for mechanical structures, cooling and at times sensing is...
We present a study of the impact of arc magnet alignment errors in the FCC-ee V22 @ Z energy lattice. The aim of the study is to provide realistic alignment tolerances. The Python accelerator toolbox PyAT was used to develop a sequence of correction steps to achieve the nominal emittance,
dynamic aperture (DA), and in the end the design luminosity. The correction scheme has been recently...
We present an ML-based end-to-end algorithm for adaptive reconstruction in different FCC detectors. The algorithm takes detector hits from different subdetectors as input and reconstructs higher-level objects. For this, it exploits a geometric graph neural network, trained with object condensation, a graph segmentation technique. We apply this approach to study the performance of pattern...
Key4hep is a framework which aims at integrating all physics software of the future colliders. The proposed poster will present a "Cheatsheet" of Key4hep to better inform all FCC colleagues at the conference about its design, implementation, conventions and best practices. The focus will be mainly held on the four pillars of Key4hep, which are: Gaudi --- event processing framework with...
The Triple Track Trigger (TTT) concept is proposed for the FCC-hh detector to exploit the full potential of the unprecedented energy ($\sqrt{s} = 100\,\mathrm{TeV}$) and high luminosity ($30\times 10^{-34}\,\mathrm{cm^{-2}s^{-1}}$) proton-proton (pp) collisions at FCC-hh. The primary objective of the TTT is to trigger physics at the electroweak scale in real time by significantly suppressing...
Dual readout crystal calorimetry allows state-of-the-art electromagnetic resolution while preserving excellent jet energy resolution. We report here updated results from the CalVision and MaxiCC collaborations, including new results from an electron test beam at DESY. We also present new results on full simulations of the calorimeter incorporated into the IDEA detector
The IDEA detector is one of the concepts under research for the Future Circular Collider (FCC). For its innermost part, the Vertex Detector, which would occupy a cylindrical volume of 50 mm radius and 550 mm lenght, a power dissipation of about 120 W is foreseen. For the removal of this heat, a cooling system based on forced air convection is under development. Such a technical solution would...
In this poster is presented a study on the structural optimization of the support structure for the interaction region (IR) of the Future Circular Collider (FCC). The aim is to optimize the structure to reduce the mass, maintaining the stiffness needed. Finite element analysis (FEA) is used to develop a detailed numerical model considering complex geometries, material properties, and loading...
We propose a concept for a e+ source based on high energy e- beams incident on conical converter targets, in pursuit of its implementation in future lepton colliders such as FCC-ee. Two conical target solutions were optimized for a state-of-the-art capture system based on a high-temperature superconducting solenoid, allowing for a full target immersion in a 12.7 T peak field. According to...
The P$^3$ experiment is the positron source test facility for FCC-ee, which is presently under construction at the Paul Scherrer Institute in Switzerland. The proposed diagnostics setup will detect the charge, longitudinal profile, and energy spectrum of multispecies electron-positron beams in the nano-Coulomb and multi-MeV range. Additionally, the diagnostics must work under extremely...
During operation, the Future Circular electron-positron Collider (FCC-ee) will be subject to vibrations from mechanical sources and ground motion, resulting in errors with respect to the closed orbit. To achieve physics performance, luminosity and beam lifetime must be kept to design specifications. To correct for errors at the interaction points (IPs), a fast feedback system is required. We...
The Future Circular electron-positron Collider (FCC-ee) is a proposed accelerator with a 91 kilometre circumference that should serve as a Higgs and electroweak factory, with unprecedented luminosity. Unavoidable misalignments and field errors will generate optics errors at the interaction point (IP), whose effect will be amplified by the beam-beam collisions, which will make it challenging...
The detectors to be operating at the Future Circular electron-positron collider (FCC-ee) must fulfill demanding requirements on the high precision measurements. Key requirements for the detector include excellent energy and angular resolution as well as excellent particle identification capabilities. The ALLEGRO detector is a general-purpose detector concept well suited for the FCC-ee. The...
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 and beamstrahlung power in response to waist shifts and vertical dispersion at the collision point. These ongoing studies aim to extract IP-aberration-related signals from the...
We present the optics design of the solenoid compensation scheme at the FCC-ee.
The 2T solenoids from the experiments induce coupling on the beams, generating an increase on vertical emittance. This compensation scheme minimizes emittance growth, reducing it to below 1% of the nominal value. A screening solenoid is placed around the Final Focus Quadrupoles to protect them from the...
