Conveners
Joint effort PED & accelerators: Machine Detector Interface (i)
- Fabrizio Palla (Universita & INFN Pisa (IT))
Joint effort PED & accelerators: Machine Detector Interface (ii)
- Angelika Drees (Brookhaven National Laboratory)
Joint effort PED & accelerators: EPOL (i)
- Anke-Susanne Mueller (Max Planck Society (DE))
Joint effort PED & accelerators: EPOL (ii)
- Alain Blondel (Universite de Geneve (CH))
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 Machine Detector Interface (MDI) represents a uniquely challenging and compact region, integrating state-of-the-art final focusing technology as close as possible to the interaction point (IP) within the detector. Within this highly constrained environment, a dedicated alignment monitoring system has been developed to track the position of the final focusing quadrupoles and other...
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...
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...
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...
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...
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 Future Circular Collider of electrons and positrons (FCC-ee) requires high
precision measurements of beam energy. This is foreseen to be facilitated by
measuring the depolarization of non-colliding electron bunches. Spin tracking is
being developed for the XSuite accelerator code package for polarization studies
in the FCC-ee. Installation in XSuite will make spin tracking more...
For the FCC week 2025, we aim to present the most recent advances in the design of the inverse Compton polarimeters for the energy calibration at the Z and WW modes of the FCC-ee machine. The polarimeter will track the polarization state of a set of non-colliding polarized bunches dedicated to energy calibration. The same instrument will also be used to insure there is no polarization buildup...
This work focuses on the energy calibration of the FCC-ee and aims to develop precise techniques for ensuring accurate beam energy measurements, essential for improving the precision of electroweak parameter determinations. To do so, the resonant depolarisation technique will be employed, requiring the continuous operation of a depolariser and Compton polarimeters for both electron and...
Highly spin-polarized electron bunches with polarization degrees of nearly 90% may be generated by photo-emission from semiconductor superlattice structures. I will discuss the cathode lifetime phenomena which limit the integrated electron fluence from the photocathode and hence the operational lifetime of a source. Fluences of 1000 Coulomb per square centimeter are possible. Whereas this...
The Electron-Ion Collider (EIC) is a future facility to be constructed at Brookhaven National Laboratory. This collider will probe the spin structure of nuclei, and the quarks and gluons they contain. This will be facilitated by collisions of polarized electrons on polarized protons and other polarized light ions. For electron and hadron beams, the required polarization is 70%. An overview of...
The FCCee physics program relies on an accurate knowledge of the centre-of-mass energy of the collisions. A key input to the centre-of-mass energy is the accurate measurement of the single beam energy which can be obtained from resonant depolarization of the e+ and e- beams as demonstrated at LEP. Resonant depolarization requires however beams with a minimum of transverse polarization. The...
