G. Ambrosio
A5030768972- Superconducting Materials and Applications
- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Magnetic confinement fusion research
- Particle physics theoretical and experimental studies
- Physics of Superconductivity and Magnetism
- Particle Detector Development and Performance
- HVDC Systems and Fault Protection
- Superconductivity in MgB2 and Alloys
- High-Energy Particle Collisions Research
- Muon and positron interactions and applications
- Spacecraft and Cryogenic Technologies
- Quantum Chromodynamics and Particle Interactions
- Distributed and Parallel Computing Systems
- Fusion materials and technologies
- Electromagnetic Launch and Propulsion Technology
- Nuclear and radioactivity studies
- Magnetic Properties of Alloys
- Thermal Analysis in Power Transmission
- International Science and Diplomacy
- Electric Motor Design and Analysis
- Non-Destructive Testing Techniques
- Magnetic Properties and Applications
- Parallel Computing and Optimization Techniques
- Magneto-Optical Properties and Applications
Fermi National Accelerator Laboratory
2016-2025
Fermi Research Alliance
2002-2024
Lawrence Berkeley National Laboratory
2009-2023
Charles Humbert 8
2023
Brookhaven National Laboratory
2022-2023
The Ohio State University
2022
Florida State University
2022
European Organization for Nuclear Research
2020
Faculty of 1000 (United Kingdom)
2020
Tianjin Hi-Tech Superconducting Electronic Technology (China)
2020
The ATLAS detector as installed in its experimental cavern at point 1 CERN is described this paper. A brief overview of the expected performance when Large Hadron Collider begins operation also presented.
In response to the 2013 Update of European Strategy for Particle Physics, Future Circular Collider (FCC) study was launched, as an international collaboration hosted by CERN. This covers a highest-luminosity high-energy lepton collider (FCC-ee) and energy-frontier hadron (FCC-hh), which could, successively, be installed in same 100 km tunnel. The scientific capabilities integrated FCC programme would serve worldwide community throughout 21st century. also investigates LHC energy upgrade,...
We review the physics opportunities of Future Circular Collider, covering its e+e-, pp, ep and heavy ion programmes. describe measurement capabilities each FCC component, addressing study electroweak, Higgs strong interactions, top quark flavour, as well phenomena beyond Standard Model. highlight synergy complementarity different colliders, which will contribute to a uniquely coherent ambitious research programme, providing an unmatchable combination precision sensitivity new physics.
In response to the 2013 Update of European Strategy for Particle Physics (EPPSU), Future Circular Collider (FCC) study was launched as a world-wide international collaboration hosted by CERN. The FCC covered an energy-frontier hadron collider (FCC-hh), highest-luminosity high-energy lepton (FCC-ee), corresponding 100 km tunnel infrastructure, well physics opportunities these two colliders, and LHC, based on FCC-hh technology. This document constitutes third volume Conceptual Design Report,...
In response to the 2013 Update of European Strategy for Particle Physics (EPPSU), Future Circular Collider (FCC) study was launched as a world-wide international collaboration hosted by CERN. The FCC covered an energy-frontier hadron collider (FCC-hh), highest-luminosity high-energy lepton (FCC-ee), corresponding 100 km tunnel infrastructure, well physics opportunities these two colliders, and LHC, based on FCC-hh technology. This document constitutes third volume Conceptual Design Report,...
Jet cross sections have been measured for the first time in proton-proton collisions at a centre-of-mass energy of 7 TeV using ATLAS detector. The measurement uses an integrated luminosity 17 nb-1 recorded Large Hadron Collider. anti-kt algorithm is used to identify jets, with two jet resolution parameters, R = 0.4 and 0.6. dominant uncertainty comes from scale, which determined within 7% central jets above 60 GeV transverse momentum. Inclusive single-jet differential are presented as...
The first measurements from proton-proton collisions recorded with the ATLAS detector at LHC are presented. Data were collected in December 2009 using a minimum-bias trigger during centre-of-mass energy of 900 GeV. charged-particle multiplicity, its dependence on transverse momentum and pseudorapidity, relationship between mean multiplicity measured for events least one charged particle kinematic range |eta|<2.5 pT>500 MeV. compared to Monte Carlo models results other experiments same...
A search for new heavy particles manifested as resonances in two-jet final states is presented. The data were produced 7 TeV proton-proton collisions by the LHC and correspond to an integrated luminosity of $315\text{ }\text{ }{\mathrm{nb}}^{\ensuremath{-}1}$ collected ATLAS detector. No observed. Upper limits set on product cross section signal acceptance excited-quark (${q}^{*}$) production a function ${q}^{*}$ mass. These exclude at 95% C.L. mass interval $0.30<{m}_{{q}^{*}}<1.26\text{...
The Mu2e experiment at Fermilab will search for charged lepton flavor violation via the coherent conversion process mu- N --> e- with a sensitivity approximately four orders of magnitude better than current world's best limits this process. experiment's offers discovery potential over wide array new physics models and probes mass scales well beyond reach LHC. We describe herein preliminary design proposed experiment. This document was created in partial fulfillment requirements necessary to...
The High Luminosity LHC (HL-LHC) project aims at accumulating 3000 <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">${\rm fb}^{-1}$</tex></formula> in the years 2023–2035, i.e., ten times more w.r.t. nominal performance expected for 2010–2021. One key element to reach this challenging is a new insertion region reduce beam size interaction point by approximately factor two. This requires larger aperture...
First measurements of the W -> lnu and Z/gamma* ll (l = e, mu) production cross sections in proton-proton collisions at sqrt(s) 7 TeV are presented using data recorded by ATLAS experiment LHC. The results based on 2250 179 candidate events selected from a set corresponding to an integrated luminosity approximately 320 nb-1. measured total Z/gamma*-boson times respective leptonic branching ratios for combined electron muon channels $\stotW$ * BR(W lnu) 9.96 +- 0.23(stat) 0.50(syst) 1.10(lumi)...
The High Luminosity (HiLumi) Large Hadron Collider (LHC) project has, as the main objective, to increase LHC peak luminosity by a factor five and integrated ten. This goal will be achieved mainly with new interaction region layout, which allow stronger focusing of colliding beams. target reduce beam size in points two, requires doubling aperture low- <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math...
Abstract The High Luminosity Large Hadron Collider (HL-LHC) is the new flagship project of CERN. First endorsed in 2013 and approved 2016, HL-LHC an upgrade accelerator aiming to increase by a factor ten statistics LHC collisions at horizon 2035–2040. relies on cutting edge technologies: among them, large aperture superconducting magnets will replace present hardware allow smaller beam size two interaction points (IPs). involves construction about 150 six different types: quadrupole triplet,...
The high luminosity LHC (HL-LHC) project is aimed at studying and implementing the necessary changes in to increase its by a factor of five. Among magnets that will be upgraded are 16 superconducting low-β quadrupoles placed around two interaction regions (ATLAS CMS experiments). In current baseline scenario, these quadrupole have generate gradient 140 T/m coil aperture 150 mm. resulting conductor peak field more than 12 T require use Nb <sub xmlns:mml="http://www.w3.org/1998/Math/MathML"...
The high luminosity upgrade of the Large Hadron Collider at CERN requires a new generation field superconducting magnets. High large aperture quadrupoles (MQXF) are needed for low-beta triplets close to ATLAS and CMS detectors, two-in-one dipoles (11-T dipoles) make room additional collimation. MQXF quadrupoles, with gradient 140 T/m in 150 mm aperture, have peak coil 12.1 T nominal current. 11-T dipoles, an 60 mm, 11.6 Both magnets require Nb <sub...
In 2004, the US DOE established LHC Accelerator Research Program (LARP) with goal of developing a technology base for future upgrades LHC. The focus magnet program, which is collaboration three laboratories, BNL, FNAL and LBNL, on development high gradient quadrupoles using <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$ Nb_3 Sn$</tex> superconductor. Other program components address issues regarding design, radiation-hard materials, long...
Dijet angular distributions from the first LHC pp collisions at center-of-mass energy s=7TeV have been measured with ATLAS detector. The dataset used for this analysis represents an integrated luminosity of 3.1pb−1. χ and centrality ratios up to dijet masses 2.8 TeV, found be in good agreement Standard Model predictions. Analysis excludes quark contact interactions a compositeness scale Λ below 3.4 95% confidence level, significantly exceeding previous limits.
In this paper, we outline the present status of design studies for high-luminosity Large Hadron Collider, focusing on choice aperture inner triplet quadrupoles. After reviewing some critical aspects such as energy deposition, shielding, heat load, and protection, main tentative parameters building a 150-mm-aperture Nb3Sn quadrupole, based experience gathered by LARP program in past several years.
Among the components to be upgraded in LHC interaction regions for HiLumi-LHC projects are inner triplet (or low-β) quadrupole magnets, denoted as Q1, Q2a, Q2b, and Q3. The new called MQXF, based on Nb <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> Sn superconducting magnet technology operate at a gradient of 132.6 T/m, with conductor peak field 11.4 T. Q1 Q3 composed magnets (called MQXFA) fabricated by U.S. Accelerator Upgrade Project...
More than half a million minimum-bias events of LHC collision data were collected by the ATLAS experiment in December 2009 at centre-of-mass energies 0.9 TeV and 2.36 TeV. This paper reports on studies initial performance detector from these data. Comparisons between Monte Carlo predictions are shown for distributions several track-and calorimeter-based quantities. The good first gives confidence successful running higher energies.
In support of the Large Hadron Collider luminosity upgrade, a large bore (120 mm) Nb <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> Sn quadrupole with 15 T peak coil field is being developed within framework US LHC Accelerator Research Program (LARP). The 2-layer design mm wide cable aimed at pre-stress control, alignment and quality while exploring magnet performance limits in terms gradient, forces stresses. addition, HQ will...
In the framework of Hi-Lumi LHC Project, CERN and U.S. LARP are jointly developing MQXF, a 150-mm aperture high-field Nb3Sn quadrupole for upgrade inner triplet low-beta interaction regions. The magnet is supported by shell-based structure, providing preload means bladder-key technology differential thermal contraction various components. Two short models have been produced using same cross section currently considered final magnet. structures were preliminarily tested replacing...