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Mr Adam Furman (EPFL - Ecole Polytechnique Federale Lausanne (CH))09/06/2026, 17:00(1) Poster
We present an improved semi-analytical model for describing electron cloud (EC) buildup in particle accelerators. Macroparticle simulations show that EC density can be modelled as a smooth logistic-like curve with superimposed oscillations of a frequency corresponding to the beam bunch spacing. The saturation density and rate of electron cloud buildup can be linked to the best-fit parameters...
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155. Integrated HTS CCT Magnet and Beam Pipe : a Proposal for the FCC-ee Final Focus Quadrupole QCL1Matthieu Marchand (Centre National de la Recherche Scientifique (FR))09/06/2026, 17:01(1) Poster
High Temperature Superconductors (HTS) and Canted Cosine Theta (CCT) technologies have been extensively studied in recent years, particularly for high-field accelerator magnets. Their application to next-generation particle accelerators is especially promising. This article presents the combination of these two technologies for the FCC-ee Final Focus (FF) quadrupole QC1L/R1, including its...
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Eleni Marshall (STFC Daresbury)09/06/2026, 17:02(1) Poster
A new method for measuring the RF surface resistance of non-evaporable getter (NEG) coatings has been developed at Daresbury laboratory. This method measures the surface resistance of tubular samples, meaning the pumping properties of the thin film can also easily be quantified and a full spectrum of NEG properties collected.
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In the design of future accelerators, it is important to maximise... -
Luca Dassa (CERN)09/06/2026, 17:03(1) Poster
With the task of supporting the development of FCC SRF cavities, a new cryogenic facility is under development at CERN. The facility shall provide the possibility to test single cavities in full reflection mode fitted with FPC coupler, HOM couplers and operated at cryogenic temperatures for the actual baseline of the FCC accelerator: its development is focused on 400 MHz cavities, operated at...
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Angela Potet09/06/2026, 17:04(1) Poster
Failures in the electro-magnetic separator (EMS) system of the Future Circular Collider electronโpositron collider (FCC-ee) can induce fast trajectory excursions with potentially critical impact on beam dynamics and machine components. This work investigates EMS failure scenarios and their consequences on beam trajectory and synchrotron radiation. Two main failure scenarios are considered:...
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Pablo Martinez Reviriego09/06/2026, 17:05(1) Poster
The high-energy linac of the Future Circular Collider electronโpositron (FCC-ee) injector requires high-performance RF accelerating structures to efficiently reach 20 GeV with stable operation. A tapered travelling-wave structure operating at 3 GHz has been designed to optimize accelerating performance and suppress wakefields.
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This work focuses on the development of a full 3D model of the... -
Pablo Martinez Reviriego09/06/2026, 17:06(1) Poster
The high-energy (HE) linac for the FCC-ee injector complex must deliver 20 GeV beams with high stability for top-up injection. Following an initial design at 2.8 GHz, the RF frequency has been updated to 3 GHz to align with the European S-band standard, enhancing compatibility with existing high-power RF components and industrial manufacturing for the Technical Design Report (TDR)...
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Mr irfan ahmed09/06/2026, 17:07(1) Poster
Earlier findings from our consortium highlighted REBaโCuโOโโโ (REBCO) coated conductors (CCs) as a promising alternative to copper for high-field radiofrequency (RF) applications in high-energy physics [1โ2]. In this work, we demonstrate that commercial REBCO CCs provide the low surface resistance required for the Future Circular Collider (FCC) beam screen to operate at 50K or even higher...
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Clara Marie Kiel (EPFL - Ecole Polytechnique Federale Lausanne (CH))09/06/2026, 17:08(1) Poster
In the Z mode operation, the FCC-ee Damping Ring must deliver a sufficiently damped train of four bunches on every linac pulse. The damping rate depends on the beam energy, on the dipole magnets and additional wiggler magnets. The ring circumference determines the number of bunch trains stored in the ring, and, thereby, their store time. The parameters for the FCC-ee DR can be optimised, based...
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Dr Matti Kalliokoski (Helsinki Institute of Physics (FI))09/06/2026, 17:09(1) Poster
Beam Loss Monitors (BLMs) are key components of machine protection systems in accelerators. In addition they provide key diagnostics for optimizing beam focusing and collimation.
At the CERN Large Hadron Collider (LHC), over 3,600 ionization chambers (ICs) monitor loss profiles around magnets [1]. However, for the proposed Future Circular Collider (FCC-ee), the sensitivity of standard ICs...
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Simone Busatto09/06/2026, 17:101(1) Poster
The baseline design of the FCC-ee main ring relies
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on thousands of separate resistive quadrupoles and sextupoles, ar-
ranged in different combinations along its 90.7 km arc. However,
this choice implies a substantial electrical power consumption
due to the aggregate ohmic dissipation of normal conducting
magnets. This paper presents an alternative design of a combined-
function... -
Pablo Mooney (The University of Manchester (GB))09/06/2026, 17:12(1) Poster
Bhabha radiative electrons are used to measure relative luminosity away from the IP. At SuperKEKB, this has been demonstrated using CVD diamond detectors at 4m from the IP. LGADs (Low Gain Avalanche Diode) have recently been tested as a potential alternative with the Lumibelle2 collaboration. This sensor has a much faster rise time, on the order of a nanosecond, but may be more susceptible to...
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Chenguang Zhang (Chinese Academy of Sciences (CN))09/06/2026, 17:13(1) Poster
The CEPC is proposed as a high-luminosity Higgs and electroweak factory, imposing stringent requirements on detector performance. The CEPC Reference Detector (TDR: https://arxiv.org/abs/2510.05260) has been assessed using full simulation and realistic reconstruction.
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Excellent performance is achieved for key physics objects, including high-efficiency tracking, precise vertexing, and... -
Vasilisa Guliaeva (EPFL - Ecole Polytechnique Federale Lausanne (CH)), Xunwu Zuo (EPFL - Ecole Polytechnique Federale Lausanne (CH))09/06/2026, 17:14(1) Poster
The prospects for measuring $b$-hadronisation fractions at the FCC-ee Tera-$Z$ run are presented. Precise knowledge of the production rates of $B_c$, $B_s$, $B_u$, $B_d$, and $\Lambda_b$ hadrons is essential for heavy-flavour physics and for interpreting rare decay measurements. We develop an inclusive hadron flavour tagging approach to identify $b$-hadron species in $Z \to q\bar{q}$ events....
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Tobias Alexandre Monnard (EPFL - Ecole Polytechnique Federale Lausanne (CH))09/06/2026, 17:15(1) Poster
This work presents the prospects for $B_s^0\to\tau^-\tau^+$ searches at FCC-ee. The standard model predicts that its branching fraction is $\mathcal{B}(B_s^0\to\tau^-\tau^+) = 7.73\times10^{-7}$. It is a highly sensitive probe to BSM but difficult to constrain in current experiments, the upper limit from LHCb being $6.83\times10^{-3}$. The fast simulated signal and inclusive $Z^0\to...
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Norman Seeba (National Institute of Chemical Physics and Biophysics (EE))09/06/2026, 17:16(1) Poster
The large number of Zโฯฯ events expected during the TeraZ program at FCC-ee will allow for precision measurements and searches for physics beyond the Standard Model, requiring accurate reconstruction of hadronically decaying tau leptons. This reconstruction is particularly challenging due to the presence of undetected neutrinos and the diverse topology of hadronic tau decays. In this work, we...
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Arina Ponomareva (Universita e INFN, Padova (IT))09/06/2026, 17:17(1) Poster
We present a common tracking validation tool developed natively within the Key4hep ecosystem for FCC-ee reconstruction studies. The tool is implemented as a Gaudi Consumer in k4DetectorPerformance and is designed to provide consistent, configurable performance evaluation across different detector concepts, reconstruction algorithms, and software configurations.
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The algorithm runs at the end... -
Ana Arranz Asensi (Univ. of Valencia and CSIC (ES))09/06/2026, 17:18(1) Poster
Highly granular calorimeters with fast response and large dynamic range are key elements of detector concepts for future colliders, where particle flow reconstruction is expected to significantly enhance physics performance. Optical sampling calorimeters are particularly attractive in this context due to their scalability, flexibility in segmentation, and robust performance.
The ALLEGRO...
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Duarte Feiteira09/06/2026, 17:19(1) Poster
In this work, I study warm Higgs portal dark matter within the freeze-in at stronger coupling framework. A low Standard Model thermal bath temperature suppresses dark matter production, allowing for a significant dark matter-Higgs coupling. This opens the possibility of probing warm dark matter through Higgs decay at colliders such as the HL-LHC and FCC, which can explore a significant region...
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Sarah Ben Abdesselem (Uppsala University (SE))09/06/2026, 17:20(1) Poster
Hidden sectors possibly connected to dark matter, โdark sectorsโ are interesting physics Beyond the Standard Model (BSM) cases that arise in many different BSM theories and could naturally solve some of the biggest questions in particle physics. This poster explores one of such dark sectors, the vector portal mediated by dark photons, which will be accessible at the electron-positron stage of...
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Dr Oleg Malyshev (UKRI/STFC Daresbury Laboratory)09/06/2026, 17:21(1) Poster
Superconducting thin film (TF) technology for SRF accelerating structures is applications is under intense development by the joint ASTeCโLancaster University team at the STFC Daresbury Laboratory, aiming developing the UKโs capability in TF-SRF technology. Over last years, the team progressed from small sample production, surface science characterisation and basic superconducting properties...
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Gauri Napoletano (EPFL - Ecole Polytechnique Federale Lausanne (CH))09/06/2026, 17:22Detector Subsystems and Concepts(1) Poster
Scintillating fibre (SciFi) trackers are a well-established technology for charged particle tracking in high-energy physics. Building on the successful operation of the LHCb Collaboration SciFi Tracker, this work investigates the potential of next-generation scintillating fibres for future collider detectors in the context of the Future Circular Collider (FCC).
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This poster presents an R\&D... -
Elena De Santis (EPFL - Ecole Polytechnique Federale Lausanne (CH))09/06/2026, 17:23Detector Subsystems and Concepts(1) Poster
The scintillating fiber tracking detector technology (SciFi) has matured over the years, and its use cases have continued to expand. With recent technological advances, it is now possible to use SciFi as the main general-purpose tracker for future colliders. In this contribution, we present results on the performance of SciFi mats featuring a double-sided readout based on digital SiPMs,...
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Dr Ismet Siral (EPFL - Ecole Polytechnique Federale Lausanne (CH))09/06/2026, 17:24Detector Subsystems and Concepts(1) Poster
The advent of Silicon Photomultipliers (SiPMs) has driven the widespread integration of Scintillating Fiber (SciFi) trackers across diverse detector designs. Building on previous efforts to model the SciFi tracker in Geant4, our team at EPFL has created a Geant4 framework capable of capturing it's full detector properties. In this contribution, we will be presenting the latest SciFi Geant4...
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Greta Gajdan (Universitaet Bern (CH))09/06/2026, 17:25Detector Subsystems and Concepts(1) Poster
The development of advanced detector technologies will play a key role in the success of next-generation high-energy physics experiments, such as the Future Circular Collider (FCC-ee). Nanocomposite-based wavelength-shifters emerge as a promising technology for novel detector designs. These materials comprise quantum dots embedded in a polymer matrix, offering narrow, tunable emission spectra...
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Liangyu Wu (Stanford University/SLAC National Accelerator Laboratory)09/06/2026, 17:26Detector Subsystems and Concepts(1) Poster
Dual-readout calorimeters achieve superior energy resolution by simultaneously measuring Cherenkov and scintillation signals for event-by-event electromagnetic fraction correction, making them attractive for next-generation Higgs factories. However, if a full waveform readout is required for time-based analysis to separate Cherenkov and scintillation signals, high off-detector data rates might...
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Dimitris Ntounis (SLAC National Accelerator Laboratory (US))09/06/2026, 17:27(1) Poster
Beam-induced backgrounds from beam-beam interactions pose a fundamental constraint on detector design at future $e^+e^-$ colliders, driving requirements on subdetector granularity, readout buffer depth, and front-end timing. We have developed a modular, parameter-driven simulation framework, built on the Key4hep software stack, that provides an end-to-end pipeline from beam-beam interactions...
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Vincent Riechers (Universite de Geneve (CH))09/06/2026, 17:28Detector Subsystems and Concepts(1) Poster
The ARC detector is a compact RICH-based particle-identification concept proposed for future lepton-collider detectors. In the CLD detector concept, ARC is integrated between the tracking system and the electromagnetic calorimeter, introducing additional material upstream of the calorimeter and requiring compression of the tracking system. The present study does not yet exploit ARC...
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Silke Mobius (Universitaet Bern (CH))09/06/2026, 17:29Detector Subsystems and Concepts(1) Poster
CASSIA (CMOS Active SenSor with Internal Amplification) is a proposed technology for 4D tracking with fast timing, where the focus lies on the development of pixel matrices with internal charge multiplication based on monolithic CMOS sensor technologies. The sensor is a novel MAPS which uses gain layers fully integrated in a 180nm imaging process to achieve internal signal amplification....
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Jacopo Fanini (CERN & Universitรฉ Paris-Saclay)09/06/2026, 17:30Detector Subsystems and Concepts(1) Poster
Separate prompt single photon electromagnetic showers from those arising from highly collimated photon pairs produced in boosted neutral pion decays is a critical capability for electromagnetic calorimetry, directly impacting both precision measurements and searches for new physics. This challenge is particularly relevant in the context of the electron-positron phase of the proposed Future...
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Mahmoud AlThakeel (CERN)09/06/2026, 17:31Detector Subsystems and Concepts(1) Poster
Future electronโpositron colliders such as the Future Circular Collider (FCC-ee) provide a clean environment for precision measurements and searches for physics beyond the Standard Model, including long-lived particles (LLPs). In this context, the muon system plays a crucial role in reconstructing highly displaced signatures that may not leave sufficient information in the inner tracking...
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Huirong Qi (Institute of High Energy Physics, CAS)09/06/2026, 17:32Detector Subsystems and Concepts(1) Poster
The Circular Electron Positron Colliders (FCCee and CEPC) were proposed as the Higgs and Z operation in High Energy Physics communities. In the ILD detector concept, as well as in comparable detector designs, the baseline detector design features a high-precision (approximately 100 ฮผm) spatial resolution Time Projection Chamber (TPC) as the main tracking device surround a 3.0T solenoid field....
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Erich Ward Varnes (University of Arizona (US))09/06/2026, 17:33Detector Subsystems and Concepts(1) Poster
A status report on the "turbine" style noble liquid EM endcap calorimeter concept for the ALLEGRO detector will be presented. Specific topics will include studies of the optimal segmentation, updated mechanical studies, and the status of tests of the prototype readout board.
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Christoph Schwanda (Austrian Academy of Sciences (AT))09/06/2026, 17:34Detector Subsystems and Concepts(1) Poster
The run 2 of the Belle II experiment at the SuperKEKB collider in Tsukuba (Japan) is expected to last until 2031. For the long-shutdown 2 (LS2) in 2032-33 an upgrade plan for the machine and the detector is currently being developed: The final focusing QCS magnets will move 10 cm closer to the IP requiring the construction of a new vertex detector. The inner layers of the drift chamber will...
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Spencer Gessner09/06/2026, 17:35MDI(1) Poster
SLAC is pursuing a number of activities related to machine detector interface (MDI) design, engineering, and performance. These activities include a mockup of the QC1 cryostat, a mockup of services for the vertex and LumiCal detectors, and modeling beam-induced backgrounds with the high performance particle-in-cell (PIC) code WarpX. We provide a timeline for these activities consistent with...
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Spencer Gessner09/06/2026, 17:36MDI(1) Poster
Laser-driven Compton backscattering (CBS) has been proposed as method for controlling the intensity of colliding bunches in the FCC-ee so as to avoid the flip-flop instability caused by intensity asymmetry in colliding bunches. Laser-based collimation has also been proposed as an indestructible collimator for high-intensity electron beams. We have initiated a laboratory-based test program of...
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Peter Kicsiny (SLAC)09/06/2026, 17:37MDI(1) Poster
Particle In Cell (PIC) codes are a key tool for performance optimization of future colliders, notably the FCC-ee. They are used to study beam-beam effects, luminosity, beam background, machine protection and lifetime. The most frequently used open source PIC codes by the collider community (GUINEA-PIG, Xsuite) are not optimized for configurations with a large Piwinski angle, relevant for...
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Mael Le Garrec (Laboratoire d'Annecy de Physique des Particules (CNRS IN2P3-LAPP))09/06/2026, 17:38(1) Poster
Ground motion can significantly impact beam stability in the FCC-ee, potentially degrading luminosity at the interaction point (IP). The study models vibrations of accelerator components, including the interaction region cryostats at the Machine Detector Interface (MDI) and the quadrupole girders in the arcs. Using measured power spectral densities (PSDs) and component-specific transfer...
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Dylan Standen (CERN)09/06/2026, 17:39(1) Poster
The recent LCC optics choice has contributed to Accelerator Beam Transfer (ABT) equipment being repositioned and as this directly impacts the integration aspects and therefor cable lengths a new study is conducted.
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This work provides an overview of integration and space requirements for fast pulsed kicker magnets, septa and their power converters and controls for the FCC-ee booster and... -
Grigorios Sergentanis09/06/2026, 17:40(1) Poster
CERN is currently developing the Future Circular Collider (FCC-ee), a next-generation accelerator complex with a 90.7 km circumference. This poster explores the technical challenges inherent in beam-transfer equipment, specifically regarding the kicker systems from Booster extraction to Collider dump. To reduce the diversity of beam-line components and standardize hardware parameters, this...
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Dora Gibellieri (University of Caen Normandy)09/06/2026, 17:41(1) Poster
The FCC-ee collider in the Z configuration, operating at 45.6 GeV, is particularly sensitive to impedance-driven collective effects. The collimation system is among the dominant contributors to the machine impedance budget, making its optimization crucial for stable operation. This work investigates the impact of collimator jaw length on wakefields and beam dynamics. The results show that...
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Michael Dole (CERN)09/06/2026, 17:42(1) Poster
The future fire detection system for the FCC tunnel will be adapted to non-standard environmental constraints. The large surface area to be protected, the presence of radioactivity, and the long distance between alcoves that can house standard electronics are among the most significant constraints. The current baseline solution relies on smoke detection by air sampling, with a similar system...
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Francesco Pinzauti (CERN)09/06/2026, 17:43(1) Poster
Evaluating production RAG systems poses a fundamental challenge: internal retrieval logic, prompt templates, and model decisions are typically inaccessible, yet systematic quality assurance is essential prior to deployment and throughout a system's lifecycle. This work presents a modular, black-box evaluation pipeline developed in the context of the FCC communication chatbot, a multilingual...
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Mr Xin-Kai Wen09/06/2026, 17:44(1) Poster
Directly probing light-quark Yukawa couplings and their flavor structure remains a major challenge due to their smallness and overwhelming QCD backgrounds. In this talk, we propose a theoretical framework to access these couplings at lepton colliders through transverse spin dependent azimuthal modulations in dihadron fragmentation. These modulations arise from the interference between Higgs...
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Dr Alexander Novokhatski (SLAC National Accelerator Laboratory)09/06/2026, 17:45MDI(1) Poster
We present the latest results of electromagnetic calculations regarding the interaction of the high-intensity beam field with the metal walls of the FCC-ee interaction region beam pipe. This interaction generates a thermal load on the beam pipe walls, which degrades vacuum conditions and can increase the background. We have improved our calculation methodology to evaluate the heat load for...
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Dr Gergely Gabor Barnafoldi (HUN-REN Wigner Research Centre for Physics (HU))09/06/2026, 17:46Physics Software and Computing(1) Poster
The computing demands of the FCC era will exceed those of the HL-LHC by an order of magnitude, with Monte Carlo (MC) event generation persistently consuming the majority of the available CPU budget. For a future heavy-ion programme, where AA event generation is nearly an order of magnitude more expensive per event than pp, the energy cost of generator tuning campaigns risks becoming a limiting...
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Andrea De Vita (CERN & Universitร di Padova), Brieuc Francois (CERN), Dolores Garcia (CERN), Marko Cechovic09/06/2026, 17:47(1) Poster
Track finding โ grouping detector hits into charged-particle trajectories โ is traditionally detector-specific and costly to adapt to the new detector concepts proposed for the FCC-ee. Classical combinatorial methods rely on hand-crafted seeding and a detailed detector description, while many machine-learning approaches depend on edge prediction or external density clustering. To bridge these...
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