Dissertationen zum Thema „High luminosty LHC“
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Perrin, Océane. „Étude de l'autocouplage du boson de Higgs avec le détecteur ATLAS au LHC. Performance d'un détecteur en temps pour la phase de Haute luminosité du LHC“. Electronic Thesis or Diss., Université Clermont Auvergne (2021-...), 2023. http://www.theses.fr/2023UCFA0164.
Der volle Inhalt der QuelleA bosonic particle with a mass equal to 125GeV was observed in 2012, by ATLAS and CMS collaborations at the Large Hadron Collider (LHC). This particle was associated with the Higgs Boson or BEH boson, predicted fifty years before its discovery by François Englert, Robert Brout and Peter Higgs. This particle validates the BEH mechanism, explaining the origin of the mass of known particles and the electroweak symmetry breaking.Since its discovery, it has become crucial to probe the various properties of the Higgs boson such as the Higgs self-coupling. The success in probing Higgs self-coupling will bring another probe of the standard model and will provide a direct measurement of the Higgs field potential in the vacuum. This measure is performed through a global analysis of the di-Higgs (HH) production at LHC, decaying into various channels.This thesis focuses on the study of the decay of the Higgs boson pair into two light leptons with the same charge (referred to as 2lSS) within the context of the Run2 at LHC, providing an integrated luminosity of 139 fb⁻¹ and a centre of mass energy of √s = 13 TeV. The study based on Monte-Carlo simulations aims to develop a machine learning-based strategy to discriminate the signal (2lSS originating from the decay of the Higgs boson pair ) from the background (all other processes producing 2lSS events). An analysis of background noise estimation and systematic uncertainty estimation is also presented in this work.Finally, although the measurement of the self-coupling can be constrained by Run2, its direct measurement is expected in the High-Luminosity phase of the LHC (HL-LHC). This phase involves a five-fold increase in instantaneous luminosity, requiring an upgrade of the ATLAS detector to ensure performance comparable to Run2 performances, despite the increase of radiation and pile-up effects. As a result, a new high-granularity timing detector (HGTD) will be added. A study on the readout electronics of this future detector is presented in this thesis, determining its performance in the test bench and during irradiation tests
Köhler, Michael [Verfasser], und Karl [Akademischer Betreuer] Jakobs. „Double-sided 3D silicon detectors for the high-luminosity LHC = Doppelseitige 3D-Siliziumdetektoren für den High-Luminosity LHC“. Freiburg : Universität, 2011. http://d-nb.info/1123462038/34.
Der volle Inhalt der QuelleWhite, S. „Determination of the absolute luminosity at the LHC“. Phd thesis, Université Paris Sud - Paris XI, 2010. http://tel.archives-ouvertes.fr/tel-00537325.
Der volle Inhalt der QuelleLaface, Emanuele. „Selected issues for the LHC luminosity upgrade“. Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2008. http://tel.archives-ouvertes.fr/tel-00377619.
Der volle Inhalt der QuelleLe présent travail de thèse propose différentes idées pour augmenter la luminosité des expériences ATLAS et CMS, les deux principales expériences du programme scientifique du LHC. Une idée pour l'amélioration de l'acceptance de l'expérience TOTEM est aussi présentée.
L'ensemble des aimants qui réalisent la focalisation finale du faisceau avant la collision ont été pris en considération pour augmenter la luminosité dans les zones expérimentales. Les nouvelles configurations ont été étudiées en utilisant des méthodes d'optique des accélérateurs et de dynamique des faisceaux. L'intégration des solutions a été aussi explorée en analysant les énergies déposées dans les différents éléments et les tolérances des alignements.
Un nouveau schéma optique pour augmenter l'acceptance de l'expérience TOTEM utilisant les cristaux de silicium est aussi présenté. Les résultats attendus sont comparés avec les résultats actuels.
Les études ont été menées en utilisant des méthodes analytiques pour les considérations générales et des méthodes numériques pour l'optimisation des paramètres.
Les résultats présentés dans cette thèse ont été publiés et présentés dans différentes conférences et workshops internationaux.
Vázquez, Furelos David. „3D pixel sensors for the high luminosity LHC ATLAS detector upgrade“. Doctoral thesis, Universitat Autònoma de Barcelona, 2019. http://hdl.handle.net/10803/669548.
Der volle Inhalt der QuelleJames, Tom. „A hardware track-trigger for CMS at the High Luminosity LHC“. Thesis, Imperial College London, 2018. http://hdl.handle.net/10044/1/60593.
Der volle Inhalt der QuellePOULIOS, STAMATIOS. „Data compression for the CMS pixel detector at High-Luminosity LHC“. Doctoral thesis, Università di Siena, 2017. http://hdl.handle.net/11365/1013403.
Der volle Inhalt der QuelleGkougkousis, Evangelos. „Etudes de bruit du fond dans le canal H→ZZ*→4l pour le Run 1 du LHC. Perspectives du mode bbH(→γγ) et études d'un système de détecteur pixel amélioré pour la mise à niveau de l'expérience ATLAS pour la phase HL-LHC“. Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS063/document.
Der volle Inhalt der QuelleThe discovery of a scalar boson, known as the Higgs boson, marked the first LHC data period (2010-2012). Using mainly di-photon and di-Z decays, with the latest leading to a four leptons final state, the mass of the boson was measured with a precision of <0.2%. Relevant couplings were estimated by combining several final states, while corresponding uncertainties would largely benefit from the increased statistics expected during the next LHC data periods (Run 2, Phase 2).The H→ZZ*→4l channel, in spite of its suppressed brunching ratio, benefits from a weak background, making it a prime choice for the investigation of the new boson’s properties. In this thesis, the analysis aimed to the observation of this mode with the ALTAS detector is presented, with a focus on the measurement and control of the reducible electron background.In the context of preparation for future high luminosity data periods, foreseen from 2025 onwards, two distinct studies are conducted:The first concerns the observability potential of the Higgs associated production mode in conjunction with two b-quarks. A multivariate analysis based on simulated data confirms a very weak expected signal in the H→di-photon channel.The second revolves around the conception and development of an inner silicon detector capable of operating in the hostile environment of high radiation and increased occupancy, expected during LHC Phase 2. Main studies were concentrated on improving radiation hardness, geometrical and detection efficiency. Through fabrication process simulation and SiMS measurements, doping profiles and electrical characteristics, expected for innovative technologies, are explored. Prototypes were designed and evaluated in test beams and irradiation experiments in order to asses their performances and that of associated read-out electronics
Gasperini, Simone. „Performance of the CMS barrel muon trigger algorithms for high luminosity LHC“. Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/17740/.
Der volle Inhalt der QuelleSucci, Giovanni. „Analysis of impregnated Niobium-Tin coils for the High-luminosity LHC magnets“. Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/17800/.
Der volle Inhalt der QuelleHall, Ben. „Designing the four rod crab cavity for the high-luminosity LHC upgrade“. Thesis, Lancaster University, 2012. http://eprints.lancs.ac.uk/76341/.
Der volle Inhalt der QuelleGradin, Joakim. „Design and performance studies of a track trigger for the high luminosity LHC“. Thesis, Uppsala universitet, Högenergifysik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-208691.
Der volle Inhalt der QuelleGonella, Laura [Verfasser]. „Low mass hybrid pixel detectors for the high luminosity LHC upgrade / Laura Gonella“. Bonn : Universitäts- und Landesbibliothek Bonn, 2013. http://d-nb.info/1045276553/34.
Der volle Inhalt der QuelleDa, Ros Bryan. „Automatizzazione dei controlli di qualità per i sensori dei moduli dell'Inner Tracker dell'esperimento ATLAS per HL-LHC“. Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/17813/.
Der volle Inhalt der QuelleMereghetti, Alessio. „Performance evaluation of the SPS scraping system in view of the high luminosity LHC“. Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/performance-evaluation-of-the-sps-scraping-system-in-view-of-the-high-luminosity-lhc(600579c0-0877-415d-bf8d-32896497b5ff).html.
Der volle Inhalt der QuelleEichhorn, Thomas [Verfasser], und Peter [Akademischer Betreuer] Schleper. „Development of Silicon Detectors for the High-Luminosity LHC / Thomas Eichhorn. Betreuer: Peter Schleper“. Hamburg : Staats- und Universitätsbibliothek Hamburg, 2015. http://d-nb.info/1074642643/34.
Der volle Inhalt der QuelleRoff, Daniel. „The development of CVD diamond tracking detectors for high luminosity experiments at the LHC“. Thesis, University of Bristol, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266908.
Der volle Inhalt der QuelleEichhorn, Thomas Valentin [Verfasser], und Peter [Akademischer Betreuer] Schleper. „Development of Silicon Detectors for the High-Luminosity LHC / Thomas Eichhorn. Betreuer: Peter Schleper“. Hamburg : Staats- und Universitätsbibliothek Hamburg, 2015. http://nbn-resolving.de/urn:nbn:de:gbv:18-74550.
Der volle Inhalt der QuelleAbdel, khalek Samah. „Mesure de la section efficace totale proton-proton avec le détecteur ATLAS au LHC“. Phd thesis, Université Paris Sud - Paris XI, 2013. http://tel.archives-ouvertes.fr/tel-00962261.
Der volle Inhalt der QuelleLUCCHINI, MARCO TOLIMAN. „Evolution of the CMS ECAL performance and R&D Studies for Calorimetry Options at High Luminosity LHC“. Doctoral thesis, Università degli Studi di Milano-Bicocca, 2014. http://hdl.handle.net/10281/54816.
Der volle Inhalt der QuelleHeller, M. „Mesure de la luminosité absolue et de la section efficace totale proton-proton dans l'expérience ATLAS au LHC“. Phd thesis, Université Paris Sud - Paris XI, 2010. http://tel.archives-ouvertes.fr/tel-00491316.
Der volle Inhalt der QuelleBeyer, Julien-Christopher [Verfasser], und Richard [Akademischer Betreuer] Nisius. „Optimisation of pixel modules for the ATLAS inner tracker at the high-luminosity LHC / Julien-Christopher Beyer ; Betreuer: Richard Nisius“. München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2019. http://d-nb.info/118357228X/34.
Der volle Inhalt der QuelleGEROSA, RAFFAELE ANGELO. „Search for new particles decaying into vector boson pairs at LHC with the CMS detector and prospects for the vector boson scattering at the future High Luminosity LHC“. Doctoral thesis, Università degli Studi di Milano-Bicocca, 2015. http://hdl.handle.net/10281/94351.
Der volle Inhalt der QuelleCalandri, Alessandro. „Propriétés du Boson de Higgs se désintégrant en 4 leptons au LHC dans l’expérience ATLAS : masse, limite sur la contribution à haute masse et sur la largeur“. Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112115/document.
Der volle Inhalt der QuelleThe theme of the analyses presented in this Thesis is the measurement of the Higgs boson properties in the H→ZZ→4l decay channel with the ATLAS experiment at the LHC. A detailed overview on the electron calibration process is first presented. In this regard, the track-cluster combination algorithm is found to improve the energy resolution of low ET electrons by exploiting both track and cluster information into a maximum likelihood fit. The improvement in resolution is approximately 18-20% for J/Ψ dielectron decays, and of the order of 3% for Z→ee events. In addition, the E-p combination algorithm has also been applied to the H→ZZ→4l channel with electrons in the final state resulting in a non-negligible gain on the invariant mass distribution (4-5%). Secondly, the Higgs mass and its total width are evaluated in the H→ZZ→4l channel. The Higgs mass is measured in the 4l decay channel with particular interest on the beneficial effects brought by the improved electron calibration and the track-cluster combination. The mass on the full 2011 and 2012 datasets is worked out with a 2-dimensional fit on the invariant mass of the 4 lepton final state, m4l, and on a boosted decision tree (BDT)-based output conceived against the main ZZ irreducible background and constructed on variables that are sensitive to the Higgs boson spin-parity state. Regarding the Higgs width, results are based on a relatively recent approach aimed at indirectly constraining the Higgs boson width by exploiting the m4l high-mass region where the Higgs boson acts as a propagator. The Higgs production cross section in the on-shell m4l region, where the Higgs boson is a resonance, depends on the total Higgs width, whereas this is not the case for the high mass m4l (off-shell). Limits on the Higgs width can be therefore set when merging the off-shell results with the on-shell ones. A limit of ∼ 6.7 times ΓSMH is obtained in the four lepton channel. Secondly, by combining with the on-shell measurement and using all the decay channels in the analysis, i.e. ZZ→4l, ZZ→2l2ν and WW→lνlν, the results lead to an observed (expected) 95% C.L. upper limit on the Higgs boson total width of 22.7 (33.0) MeV (4.2 MeV is the Standard Model predicted Higgs width at mH=125 GeV).The last section of the thesis is devoted to the evaluation of the Higgs width at √s=14 TeV in the high luminosity scenario (High Luminosity LHC), 300 fb⁻¹ and 3000 fb⁻¹, by employing the same techniques exploited in the previous Run 1 analysis at √s=8 TeV
Herkert, Adrian [Verfasser], und André [Akademischer Betreuer] Schöning. „Characterization of a Monolithic Pixel Sensor Prototype in HV-CMOS Technology for the High-Luminosity LHC / Adrian Herkert ; Betreuer: André Schöning“. Heidelberg : Universitätsbibliothek Heidelberg, 2020. http://d-nb.info/1205002774/34.
Der volle Inhalt der QuelleCavalier, Sophie. „Détermination des paramètres optiques nécessaires pour la mesure de la luminosité absolue et de la section efficace totale dans ATLAS“. Phd thesis, Université Paris Sud - Paris XI, 2013. http://tel.archives-ouvertes.fr/tel-00870367.
Der volle Inhalt der QuelleAli, Babar. „Study of the performance of the Level-1 track trigger in the H→ττ→ee channel in ATLAS at high luminosity LHC“. Thesis, Uppsala universitet, Högenergifysik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-208333.
Der volle Inhalt der QuelleHallsjö, Sven-Patrik. „Search for Dark Matter in the Upgraded High Luminosity LHC at CERN : Sensitivity of ATLAS phase II upgrade to dark matter production“. Thesis, Linköpings universitet, Institutionen för fysik, kemi och biologi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-107583.
Der volle Inhalt der QuellePaggi, Giulia. „Sviluppo di un algoritmo di trigger per la ricerca di particelle esotiche a lunga vita media a High Luminosity LHC con il rivelatore di muoni di CMS“. Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21605/.
Der volle Inhalt der QuelleMorrone, Marco. „Thermomechanical study of complex structures in the aperture of superconducting magnets : application to the design of the High-Luminosity LHC shielded beam screen“. Thesis, Imperial College London, 2018. http://hdl.handle.net/10044/1/60584.
Der volle Inhalt der QuelleBassalat, Ahmed. „Contribution to the construction of the Insertable B-Layer of ATLAS for high luminosity upgrade and Research for invisible Higgs“. Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLS245.
Der volle Inhalt der QuelleFor Run 2 of the LHC a fourth, innermost Pixel Detector layer on a smaller radius beampipe has been installed in the ATLAS Detector to add redundancy against radiation damage ofthe current Pixel Detector and to ensure a high quality tracking and b-tagging performance ofthe Inner Detector over the coming years until the High Luminosity Upgrade. State of the artcomponents have been produced and assembled onto support structures known as staves overthe last two years. In total, 20 staves have been built and qualified in a designated QualityAssurance setup at CERN of which 14 have been integrated onto the beam pipe. In the secondpart, A search for a Higgs boson produced via vector-boson fusion and decaying into invisibleparticles is discussed, using 20.3 fb−1 of proton proton collision data at the centre of massenergy of 8 TeV recorded by the ATLAS detector at the LHC. For a Higgs boson with a massof 125 GeV, assuming the Standard Model production cross section, an upper bound of 0.28is set on the branching fraction of H →invisible at 90% confidence level, where the expectedupper limit is 0.31. The results are interpreted in model of Higgs portal dark matter where thebranching fraction limit is converted into upper bounds on the dark matter nucleon scatteringcross section as a function of the dark matter particle mass, and compared to results from thedirect dark matter detection experiments
ZUOLO, DAVIDE. „Development of silicon pixel sensors for the High Luminosity upgrade of the CMS experiment at LHC and search for Higgs boson pair production in the $bar b au^+ au^- :$ final state at $sqrt{s}$ = 13 TeV“. Doctoral thesis, Università degli Studi di Milano-Bicocca, 2021. http://hdl.handle.net/10281/308715.
Der volle Inhalt der QuelleMy research activity during the PhD has focused mainly on the development of new silicon pixel sensors for the upgrade of the CMS experiment inner tracker in view of the CERN LHC High Luminosity phase (HL-LHC), an activity I started to work on during my master thesis. These sensors must be capable of surviving irradiation fluences up to a few 10^16 neq/cm^2 at ~ 3 cm from the interaction point. The R&D program carried out by an INFN ATLAS-CMS group, in collaboration with Fondazione Bruno Kessler, covers both planar and 3D pixel devices made on substrates obtained by the Direct Wafer Bonding technique. Using this technology, every fabrication process takes place on one side only of the wafer, with consequent cost savings. The active thickness of the planar sensors studied in this thesis is 100 um or 130 um, that of 3D sensors 130 um. Sensors belonging to the first batches have pixel cells with dimensions of 100 x 150 um^2, same as the sensors currently installed in CMS. These dimensions have been reduced to 25 x 100 um^2 and 50 x 50 um^2 in order to cope with the higher track multiplicity expected at HL-LHC. Prototypes of hybrid modules, bump-bonded to different readout chips, have been characterized in beam tests. Results on their performance before and after irradiation up to maximum fluence of ∼ 1 x 10^16 neq/cm^2 are reported in this thesis. After a couple of years working on the characterization of the new prototypes I became interested also on the impact of the pixel detector on the physics program of the experiment. At the beginning of my second year of PhD I started to look for a physics analysis where the information of the pixel detector is largely exploited. I chose to work on the search for double Higgs boson production in final states with 2 b-jets and 2 tau leptons since the reconstruction of the b-jets and tau leptons makes large use of vertexes and tracks information. Another reason why I chose this analysis is that it will benefit from the incremented statistics foreseen at HL-LHC, possibly leading to the first experimental evidence of HH production. Double Higgs searches play a fundamental role in the characterization of the Higgs boson as they represent the favorite channel to measure the Higgs boson trilinear self coupling. Any deviation from the theoretical predictions of the Standard Model would lead to sizable changes in both the kinematics and production rate of HH events, thus making double Higgs searches sensitive to new physics effects. The bbtau^+tau^-final state represents one of the most interesting channels to explore double Higgs production, because of the high branching ratio and the relatively small background contamination. The strategy developed to analyze data collected by the CMS experiment during the LHC Run 2 (2016 + 2017 + 2018), corresponding to an integrated luminosity of 137 fb^-1, is described in this thesis. The expected sensitivity of the analysis, targeting both the Gluon Fusion (GGF) and Vector Boson Fusion (VBF) production channels, is also reported.
Brahimi, Nihal. „Search for the Higgs boson in the ttH(H->bb) channel and measurement of the production cross-section of ttbb with the ATLAS detector at the LHC“. Thesis, Aix-Marseille, 2019. http://www.theses.fr/2019AIXM0337.
Der volle Inhalt der QuelleSince the discovery of the Higgs boson at a mass around 125 GeV by both ATLAS and CMS collaborations in July 2012, it became crucial to measure its properties, such as its couplings to fermions, and unravel any deviations from the Standard Model (SM) predictions. The top quark Yukawa coupling is the strongest in the fermionic sector and one of the best probes to shed light on phenomena beyond the SM. The Higgs boson production in association with a pair of top quarks and its subsequent decay into a pair of bottom quarks, ttH(H->bb), grants direct access to this coupling in addition to the bottom quark Yukawa coupling. Although the ttH production was recently established by both ATLAS and CMS combining several channels including ttH(H->bb), the latter has never been observed directly. The complexity of the ttH(H->bb) final state with a large number of b-jets, and the overwhelming background of the top pair production with additional jets (tt+jets), especially b-jets (ttbb), are the major challenges of this channel. Thus, b-jet identification referred to as b-tagging, and the control of the ttbb background are key ingredients for this analysis. This thesis presents the search for ttH(H->bb) performed with 36.1 /fb of LHC data collected by the ATLAS detector in 2015 and 2016. Novel techniques to improve the search sensitivity with full Run 2 data are also developed. Particularly, detailed studies are presented including a differential cross-section measurement of the main ttbb background. The optimization of the b-tagging algorithms in view of the High Luminosity LHC upgrade, after the replacement of the ATLAS inner detector, is also presented
Navarro, Jose Luis La Rosa. „Measurement of Z boson production in association with b-jets in proton-proton collisions at 13 TeV and studies of an electron trigger system for high luminosity in the ATLAS experiment“. Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-09112017-024133/.
Der volle Inhalt der QuelleEsta tese apresentará resultados da medida da produção de bósons Z no canal de elétrons associado com jatos b em colisões próton-próton a 13 TeV, uma medida de fundamental interesse em medidas de precisão e buscas por nova física. Essa medida representa importantes testes de precisão da QCD perturbativa e prove informações relacionadas ao quark b dentro do próton. Essa medida também representa uma das principais fontes de background na produção do quark top, medidas de precisão do Higgs e na busca de partículas supersimétricas. Os resultados na medida da seção de choque e distribuições cinemáticas apresentadas neste trabalho são comparados com os esquemas de quatro e cinco sabores nos geradores Monte Carlo, mostrando que as predições são consistentes dentro das incertezas experimentais. Nesta tese também serão apresentados estudos do desenvolvimento de um sistema de seleção de eventos proposto para medidas em alta luminosidade. Esse sistema será implementado durante o segundo LHC long shutdown (2019-2020), envolvendo estudos na reconstrução de elétrons usando o conceito de supercélulas, onde a fina granularidade das células do detector de Argônio Líquido do ATLAS será aproveitada para mitigar as dificuldades que se terão em condições de alta luminosidade. Um dos problemas é o aumento do empilhamento (pile-up), causado por colisões secundárias de prótons no mesmo evento, gerando uma grande quantidade de jatos de baixo pT que podem ser erroneamente identificados como elétrons. Os estudos neste trabalho apresentam novos discriminantes com base na forma da cascata eletromagnética, mostrando que é possível reduzir ainda mais a taxa de jatos de baixo pT mantendo uma boa reconstrução de elétrons.
Haughton, Iain William Philip. „3D detectors for the High Luminosity LHC, with a feasibility study into the observation of ZZ production in the Z → ee/μμ, Z → ττ channel with the ATLAS detector“. Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/3d-detectors-for-the-high-luminosity-lhc-with-a-feasibility-study-into-the-observation-of-zz-production-in-the-z--ee-z---channel-with-the-atlas-detector(822c2a2f-d051-4f7b-b3a5-1bc890883d29).html.
Der volle Inhalt der QuelleChen, Zongde. „Depleted CMOS sensor development for pixel particle detectors under high intensity and high radiative dose“. Thesis, Aix-Marseille, 2019. http://www.theses.fr/2019AIXM0430.
Der volle Inhalt der QuelleThe Inner Tracker (ITk) system of the ATLAS experiment will be upgraded for the 2026 High Luminosity Large Hadron Collider (HL-LHC) run. The HL-LHC will operate with a center of mass energy of 14 TeV and a peak instantaneous luminosity five times higher than at present. The increased luminosity will result in roughly ten times higher radiation levels and data rates. To cope with the ATLAS requirements in terms of radiation hardness, readout speed and granularity at the HL-LHC, the replacement of the present ATLAS Inner Tracker (ITk) is needed. Two large-scale depleted CMOS sensors in the 150 nm LF-technology called LF-CPIX and LF-MONOPIX, developed in the framework of the ATLAS Inner Tracker (ITK) upgrade for High Luminosity LHC. The work presented here shows the characterization for these three prototypes, with contributions concerning the setup development, 55Fe and 90Sr source calibration, modifications of the FPGA firmware and development of test programs. A main concern was the investigation on the radiation hardness for both the electronics and the sensor parts. We will show results concerning characterizations for these prototypes in the laboratory performance at CPPM, as well as results in multiple radiation campaigns performed at the 24 GeV IRRAD proton facility at CERN, to study the effects of Non-Ionizing Energy Loss (NIEL) and Total Ionizing Dose (TID) on the prototypes
Madysa, Nico [Verfasser], Arno [Akademischer Betreuer] Straessner und Peter [Gutachter] Krieger. „Simulation Studies of Digital Filters for the Phase-II Upgrade of the Liquid-Argon Calorimeters of the ATLAS Detector at the High-Luminosity LHC / Nico Madysa ; Gutachter: Peter Krieger ; Betreuer: Arno Straessner“. Dresden : Technische Universität Dresden, 2021. http://d-nb.info/1236383737/34.
Der volle Inhalt der QuelleBhatt, Heeral. „Design and Development of the Beam Position Monitor Calibration Test Bench : For testing the electrical parameters of the new High Luminosity Large Hadron Collider (HL-LHC) Beam Position Monitors using the Concurrent Engineering Approach“. Thesis, Luleå tekniska universitet, Rymdteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-81200.
Der volle Inhalt der QuelleWiik-Fuchs, Liv [Verfasser], Karl [Akademischer Betreuer] Jakobs und Jochen [Akademischer Betreuer] Dingfelder. „Search for heavy lepton resonances decaying to a Z Boson and a lepton in proton-proton at [radical]s = 8 TeV with the ATLAS detector and investigations of radiation tolerant silicon strip detectors for the high-luminosity LHC upgrade of the ATLAS inner detector“. Freiburg : Universität, 2016. http://d-nb.info/1134884028/34.
Der volle Inhalt der QuelleMårtensson, Oskar. „LHCb Upstream Tracker box : Thermal studies and conceptual design“. Thesis, Umeå universitet, Institutionen för fysik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-116163.
Der volle Inhalt der QuelleLHC (Large Hadron Collider) kommer under åren 2019-2020 att ha ett längre driftstopp. Under detta driftstopp så kommer LHC's injektionsanordningar att uppgraderas för att kunna sätta fler protoner i circulation i LHC, och därmed öka antalet partikelkollisioner per tidsenhet. Denna uppgradering kommer att vara första steget i "High Luminocity LHC"-programmet som kommer att realiseras år 2024-2026. LHCb-experimentet, vars främsta syfte är att studera CP-brott, kommer också att uppgraderas under stoppet 2019-2020. Framför allt så ska avläsningsfrekvensen ökas från dagens 1MHz till 40MHz, och experimentet ska förberedas för de högre strålningsdoser som kommer att bli aktuella efter stoppet 2024-2026. En av LHCb's deldetektorer, TT detektorn, kommer att bytas ut mot en ny deldetektor som kallas UT. Den här rapporten presenterar den förberedande designen av den låda som ska isolera UT från dess omgivning och försäkra optimala förhållanden för detektorn. Kraven på den isolerande lådan och tillvägagångssätt för att uppfylla dessa krav presenteras.
LHCb, LS2 and LS3 Upgrade
Schmitt, Sebastian [Verfasser], und André [Akademischer Betreuer] Schöning. „Measurement of the Inclusive pp->Z/gamma*->e+e- Cross Section at sqrt(s) = 7 TeV with the ATLAS Experiment and Design Studies for a First Level Track Trigger for the ATLAS Trigger Upgrade at the future High Luminosity LHC / Sebastian Schmitt ; Betreuer: André Schöning“. Heidelberg : Universitätsbibliothek Heidelberg, 2013. http://d-nb.info/1177382881/34.
Der volle Inhalt der QuelleRICCI, ALESSANDRO MARIA. „Superconducting magnets for future accelerators“. Doctoral thesis, Università degli studi di Genova, 2020. http://hdl.handle.net/11567/1002038.
Der volle Inhalt der QuelleAsbah, Nedaa. „LHC luminosity measurement with the ATLAS-MPX detectors“. Thèse, 2013. http://hdl.handle.net/1866/10714.
Der volle Inhalt der QuelleIn operation since 2008, the ATLAS experiment is the largest of all the experiments at the LHC. The ATLAS-MPX (MPX) detectors installed in ATLAS are based on the Medipix2 silicon pixelated detector which has been developed by the Medipix Collaboration at CERN to perform real-time imaging. They can be used for luminosity measurements. They were installed at sixteen different positions in the ATLAS cavern at the LHC in 2008. The MPX network successfully collected data independently of the ATLAS data recording chain from 2008 to 2013. Each MPX detector provides measurements of the integrated LHC luminosity. This thesis describes the technique for calibrating the luminosity data and performance of MPX detectors for measuring the luminosity in 2012. The calibration was performed via the van der Meer (vdM) scans technique which allows the measurement of the convolved beam sizes in the vertical and the horizontal planes at the ATLAS interaction point (IP1). The determination of the absolute luminosity requires a precise knowledge of the beam intensities and the number of beam bunches. A luminosity calibration constant was determined. The three calibration scans were analyzed and the results were cross-checked among the MPX detectors and other ATLAS sub-detectors specifically dedicated to luminosity measurement. The luminosity determined from the calibration scans was compared to the luminosity of regular runs before and after the vdM scans. The MPX network gives reliable information for the overall ATLAS luminosity determination over a wide dynamic range (luminosity from 5 × 10^29 cm−2 s−1 up to 7 × 10^33 cm−2 s−1).
(9385172), Simran Sunil Gurdasani. „Pixel Sensor Module Assembly Procedures for The CMS High Luminosity LHC Upgrade“. Thesis, 2020.
Den vollen Inhalt der Quelle findenThe high luminosity phase of the LHC, poised to start taking data in 2027, aims to increase the instantaneous luminosity of the machine to 7.5 x 1034 cm-2 s-1. This will make it possible for experiments at CERN to make higher precision measurements on known physics phenomenon as well as to search for “new physics”. However, this motivates the need for hardware upgrades at the various experiments in order to ensure compatibility with the HL-LHC. This thesis describes some of the efforts to upgrade the inner-most layers of the Compact Muon Solenoid, namely the CMS silicon pixel tracking detector.
Silicon sensors used to track particles are installed in the detector as part of a pixel sensor module. Modules consist of a silicon sensor-readout chip assembly that is wire-bonded to an HDI, or High Density Interconnects to provide power and signals.
As part of the upgrade, 2,541 modules need to be assembled delicately and identically with alignment error margins as low as 10 microns. Assembly will be across three production sites in clean rooms to avoid dust and humidity contamination.
In addition, the modules need to survive high magnetic fields and extended close-range radiation as part of the HL-LHC.
In line with this effort, new materials and assembly procedures able to sustain such damage are investigated. Techniques to assemble modules are explored, specifically precision placing of parts with a robotic gantry and techniques to protect wirebonds. This is followed by a discussion of the accuracy and repeatability.
Shroff, Maheyer Jamshed. „A data injector for the High Luminosity LHC ATLAS Liquid Argon Signal Processor“. Thesis, 2020. http://hdl.handle.net/1828/12082.
Der volle Inhalt der QuelleGraduate
Rieger, Julia. „Detector Development for the High Luminosity Large Hadron Collider“. Doctoral thesis, 2016. http://hdl.handle.net/11858/00-1735-0000-0028-8802-8.
Der volle Inhalt der QuelleBuschmann, Eric. „The Readout System for the ITk Pixel Demonstrator for the ATLAS High-Luminosity Upgrade“. Doctoral thesis, 2020. http://hdl.handle.net/21.11130/00-1735-0000-0005-13B5-9.
Der volle Inhalt der QuelleNguyen, Thong Quang. „Searches for Nonresonant Higgs Boson Pair Production and Long-Lived Particles at the LHC and Machine-Learning Solutions for the High-Luminosity LHC Era“. Thesis, 2022.
Den vollen Inhalt der Quelle findenThis thesis presents two physics analyses using 137 fb−1 proton-proton collision data collected by the CMS experiment at √s = 13 TeV, along with a series of machine-learning solutions to extend the physics program at the LHC and to address the computational challenges in the High-Luminosity LHC era. The first analysis searches for nonresonant Higgs boson pair production in final states with two photons and two bottom quarks, with no significant deviation from the background-only hypothesis observed. The observed (expected) upper limit on the product of the Higgs boson pair production cross section and branching fraction into bb̅γγ is 0.67 (0.45) fb, corresponding to 7.7 (5.2) times the Standard Model prediction. The modifier of the Higgs trilinear self-coupling is constrained within the range -3.3 < κλ < 8.5. The modifier for coupling between a pair of Higgs bosons and a pair of vector bosons, along with the 2-dimensional constraint of the modifiers of Higgs self-coupling and Yukawa coupling, are also reported. A graph-based algorithm to identify boosted H → bb̅ jets to improve future Higgs search is presented. The second analysis searches for long-lived supersymmetry particles decaying to photons and gravitinos in the context of gauge-mediated supersymmetry breaking model. Results are presented in terms of 95% confidence level expected exclusion limits on the masses and proper decay lengths of the neutralino, which exceed the limits from the previous searches by up to 100 GeV for the neutralino mass and by five times for the neutralino proper decay length. A strategy for model-independent new physics searches is presented with an anomaly trigger based on unsupervised learning algorithms that can be deployed in both the high-level trigger and the Level-1 trigger in CMS. Three other machine-learning solutions are presented to address the computational challenges in the HL-LHC era: a layer based on multi-modal deep neural networks that can reduce the false-positive events selected by the trigger by over one order of magnitude while retaining 99% of signal events, a full-event simulation algorithm based on recurrent generative adversarial networks that has potential to replace traditional simulation method while being five orders of magnitude faster, and a fast simulation algorithm for specific analyses based on encoder-decoder architecture that would result in about an order-of-magnitude reduction in computing and storage requirements for the collision simulation workflow.
Madysa, Nico. „Simulation Studies of Digital Filters for the Phase-II Upgrade of the Liquid-Argon Calorimeters of the ATLAS Detector at the High-Luminosity LHC“. 2020. https://tud.qucosa.de/id/qucosa%3A75152.
Der volle Inhalt der QuelleThe Large Hadron Collider and the ATLAS detector are undergoing a comprehensive upgrade split into multiple phases. This effort also affects the liquid-argon calorimeters, whose main readout electronics will be replaced completely during the final phase. The electronics consist of an analog and a digital portion: the former amplifies the signal and shapes it to facilitate sampling, the latter executes an energy reconstruction algorithm. Both must be improved during the upgrade so that the detector may accurately reconstruct interesting collision events and efficiently suppress uninteresting ones. In this thesis, simulation studies are presented that optimize both the analog and the digital readout of the liquid-argon calorimeters. The simulation is verified using calibration data that has been measured during Run 2 of the ATLAS detector. The influence of several parameters of the analog shaping stage on the energy resolution is analyzed and the utility of an increased signal sampling rate of 80 MHz is investigated. Furthermore, a number of linear and non-linear energy reconstruction algorithms is reviewed and the performance of a selection of them is compared. It is demonstrated that increasing the order of the Optimal Filter, the algorithm currently in use, improves energy resolution by 2 to 3 % in all detector regions. The Wiener filter with forward correction, a non-linear algorithm, gives an improvement of up to 10 % in some regions, but degrades the resolution in others. A link between this behavior and the probability of falsely detected calorimeter hits is shown and possible solutions are discussed.:1 Introduction 2 An Overview of High-Energy Particle Physics 2.1 The Standard Model of Particle Physics 2.2 Verification of the Standard Model 2.3 Beyond the Standard Model 3 LHC, ATLAS, and the Liquid-Argon Calorimeters 3.1 The Large Hadron Collider 3.2 The ATLAS Detector 3.3 The ATLAS Liquid-Argon Calorimeters 4 Upgrades to the ATLAS Liquid-Argon Calorimeters 4.1 Physics Goals 4.2 Phase-I Upgrade 4.3 Phase-II Upgrade 5 Noise Suppression With Digital Filters 5.1 Terminology 5.2 Digital Filters 5.3 Wiener Filter 5.4 Matched Wiener Filter 5.5 Matched Wiener Filter Without Bias 5.6 Timing Reconstruction, Optimal Filtering, and Selection Criteria 5.7 Forward Correction 5.8 Sparse Signal Restoration 5.9 Artificial Neural Networks 6 Simulation of the ATLAS Liquid-Argon Calorimeter Readout Electronics 6.1 AREUS 6.2 Hit Generation and Sampling 6.3 Pulse Shapes 6.4 Thermal Noise 6.5 Quantization 6.6 Digital Filters 6.7 Statistical Analysis 7 Results of the Readout Electronics Simulation Studies 7.1 Statistical Treatment 7.2 Simulation Verification Using Run-2 Data 7.3 Dependence of the Noise on the Shaping Time 7.4 The Analog Readout Electronics and the ADC 7.5 The Optimal Filter (OF) 7.6 The Wiener Filter 7.7 The Wiener Filter with Forward Correction (WFFC) 7.8 Final Comparison and Conclusions 8 Conclusions and Outlook Appendices
„Topics in particle physics: 1) Sensitivity of W H --> lvbb for high luminosity LHC and 2) Study of surface cosmic rays“. Thesis, 2014. http://repository.lib.cuhk.edu.hk/en/item/cuhk-1292108.
Der volle Inhalt der QuelleThesis M.Phil. Chinese University of Hong Kong 2014.
Abstracts also in Chinese.
Title from PDF title page (viewed on 20, December, 2016).
Kwok, Ka Hei Martin = Li zi wu li zhuan ti : 1) Zai gao liang du LHC zhong de W H --> lvbb de ling min du ji 2) di biao yu zhou she xian yan jiu / Guo Jiaxi.