International Linear Collider
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AIDAinnova Course on Quantum Applications
No full textCorrelations of photons from entangled quantum sources offer advantages and provide additional opportunities such as low light imaging or new sensing approaches. In general, strong spectro-temporal correlations inherent for entangled photons make those sensing techniques much more precise and resource efficient. To take advantage of the correlations one would need efficient single photon imagers with excellent timing resolution. In the presentation I will review the existing detector options focussing on the time-stamping CMOS and SPAD cameras, which have been used recently in a variety of quantum imaging experiments, in particular the cameras with data-driven readouts. As a motivation for fast imaging in astrophysics I will also review the standard techniques of single-photon amplitude (Michelson) interferometry and two-photon (Hanbury Brown & Twiss) intensity interferometry, and then visit recent ideas for how they can be improved in the optical through the use of entanglement distribution. A proposed new technique of two-photon amplitude interferometry requires precise spectral binning and 10 picosecond scale time-stamping of single optical photons with a product of resolutions close to the Heisenberg Uncertainty Principle limit. In all cases I will illustrate the concepts with recent results and will discuss future directions for the technology.
Andrei Nomerotski (Florida International University and Czech Technical University
New Facilities for the Production of 1 mm gap Resistive Plate Chambers for the Upgrade of the ATLAS Muon Spectrometer.
No full textThe ATLAS Muon Spectrometer is set for a significant upgrade as part of the High-Luminosity LHC (HL- LHC) program, which includes the installation of three additional full coverage layers of new generation thin-gap Resistive Plate Chambers (RPCs) in the inner barrel region. These RPCs feature a reduced gas gap thickness of 1 mm between high-pressure phenolic laminate (HPL) electrodes, enhancing their background rate capability and longevity. This upgrade aims to maximize the muon trigger acceptance and efficiency. To achieve this, nearly 1000 RPC gas gaps need to be produced. To mitigate reliance on a single supplier and expedite production, the ATLAS muon community has partnered with two new companies in Germany and the Max Planck Institute for Physics in Munich. The gas gap assembly procedure was adapted to the infrastructure and tools available at the industrial manufacturers, facilitating the transfer of technology to industry after the prototyping phase. The certification of the manufacturers was achieved by constructing several small- and full-size RPC gas gap prototypes at each facility. The prototypes underwent rigorous testing at CERN’s Gamma Irradiation Facility (GIF++), where their efficiency and time resolution were measured under different gamma background levels. The performance of these prototypes met the requirements for ATLAS at the HL-LHC. Additionally, the prototypes successfully passed an accelerated aging test at the GIF++, where they were exposed to the maximum photon dose expected during HL-LHC operations. This contribution will present the gas gap manufacturing procedures, the results of the certification tests, and the comparative analysis of the production methods investigated to ensure the reliability and efficiency of RPC production at external companies. The outcomes demonstrate that the new facilities are capable of producing high-quality RPCs according to the industrial standards
The PicoCal of LHCb Upgrade 2
No full textThe LHCb experiment aims to collect a dataset of 300 fb in its high-luminosity phase. Such an objective calls for challenging upgrades of all the detector systems to successfully operate at a peak luminosity of cm s. The future electromagnetic calorimeter, named PicoCal, will have to face a high radiation dose and mitigate a harsh occupancy, keeping the current energy resolution. To meet these requirements, the calorimeter regions are redesigned with finer granularity, longitudinal segmentation, and a timing resolution of approximately 20 ps.The candidate technologies are Spaghetti calorimeter (SpaCal) with garnet scintillating crystals (GAGG) and tungsten absorber in the innermost region, SpaCal with scintillating plastic fibres and lead absorber in the intermediate area, and Shashlik with polystyrene tiles, lead absorber, and fast WLS fibres in the outer part. An additional timing layer based on microchannel-plate technology was investigated.This proceeding summarises the proposed new features and the status of the art of the R&D; project, reporting results from test-beam activities
Generative models and seq2seq techniques for the flash-simulation of the LHCb experiment
No full textSimulating detector and reconstruction effects on physics quantities is crucial for data analysis, but it is coming unsustainably costly for the upcoming HEP experiments. The most radical approach to speed-up detector simulation is Flash Simulation, as proposed by the LHCb collaboration in Lamarr, a software package implementing a novel simulation paradigm relying on Deep Generative Models and Seq2seq attention-driven techniques to deliver simulated samples. Thanks to its modular layout, Lamarr provides analysis-level quantities by applying a pipeline of machine learning-based modules that properly transforms the information resulting from physics generators. Good agreement is observed by comparing key reconstructed quantities obtained with Lamarr against those from the existing detailed Geant4-based simulation. Lamarr has been designated with dual capabilities: it can function as a stand-alone simulation framework, while also being seamlessly integrated into the LHCb simulation software
Visit by Morten Meldal and Phaedria Marie St. Hilaire, Denmark
No full textVisit by Morten Meldal and Phaedria Marie St. Hilaire, Kingdom of Denmark on Monday, 3 February 2025
Exploring the DGLAP resummation in the JIMWLK Hamiltonian
No full textWe explore the recently derived equation that resums DGLAP corrections to the JIMWLK Hamiltonian in the simplified setting of the SU(2) gauge theory. We solve the equation numerically for the scattering matrix of a dressed gluon for a particular initial condition, that corresponds to a dipole initial state. As expected, the -matrix of a single dressed gluon state ceases to be unitary if evolved to significant . Our numerical results indicate an interesting universal (independent of the coupling constant) pattern for this deviation from unitarity
Recent test beam results of ATLAS ITk pixel 2 modules
No full textThe ATLAS inner detector will be completely replaced to cope with the increased occupancy and radiation damage that will be posed by the High Luminosity phase of the Large Hadron Collider. The new all-silicon Inner Tracker will consist of pixel sensors in the innermost part. They will be realized using different silicon sensor technologies and will be read out with ITkPixV2 ASICs. Their connection is realized by bump bonding. n-in-p planar hybrid modules 100 μm and 150 μm thick will instrument the four outer layers of the pixel detector. Due to their radiation hardness, 3D sensors will be installed in the innermost layer, where a fluence up to 2.0×1016 neq/cm2 is expected. Their production is distributed among different vendors, and the pre-production sensors from each vendor are progressively being teste
MAIA: A new detector concept for a 10 TeV muon collider
No full textMuon colliders offer a compelling opportunity to explore the TeV scale and conduct precision tests of the Standard Model, all within a relatively compact geographical footprint. This paper introduces a new detector concept, MAIA (Muon Accelerator Instrumented Apparatus), optimized for TeV collisions. The detector features an all-silicon tracker immersed in a 5T solenoid field. High-granularity silicon-tungsten and iron-scintillator calorimeters surrounding the solenoid capture high-energy electronic and hadronic showers, respectively, and support particle-flow reconstruction. The outermost subsystem comprises an air-gap muon spectrometer, which enables standalone track reconstruction for high-momentum muons. The performance of the MAIA detector is evaluated in terms of differential particle reconstruction efficiencies and resolutions. Beam-induced background (BIB) simulations generated in FLUKA are overlaid with single particle gun samples to assess detector reconstruction capabilities under realistic experimental conditions. Even with BIB, reconstruction efficiencies exceed 95% for energetic tracks, photons, and neutrons in the central region of the detector. This paper outlines promising avenues of future work, including forward region optimization and opportunities for enhanced flavor/boosted object tagging, and addresses the technological assumptions needed to achieve the desired detector performance
