Commissioning Of The Lhcb Velo Detector And The Performance Of Irradiated Velo Sensors In A Proton Testbeam
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Commissioning Of The Lhcb Velo Detector And The Performance Of Irradiated Velo Sensors In A Proton Testbeam
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Author : Abdirizack Noor
language : en
Publisher:
Release Date : 2012
Commissioning Of The Lhcb Velo Detector And The Performance Of Irradiated Velo Sensors In A Proton Testbeam written by Abdirizack Noor and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
The Design And Production Of The Lhcb Velo High Voltage System And Analysis Of The Bd K Rare Decay
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Author : Barinjaka Rakotomiaramanana
language : en
Publisher:
Release Date : 2010
The Design And Production Of The Lhcb Velo High Voltage System And Analysis Of The Bd K Rare Decay written by Barinjaka Rakotomiaramanana and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
Characterisation And Commissioning Of The Lhcb Velo Detector
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Author : Erik Aras Papadelis
language : en
Publisher:
Release Date : 2009
Characterisation And Commissioning Of The Lhcb Velo Detector written by Erik Aras Papadelis and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
Application Of Machine Learning Methods For The Analysis Of The Calibration Of The Lhcb Velo Detector Studies Of Irradiated Silicon Pixel Sensors And Reconstruction Of The Neutrino Interaction In Lartpc Detector
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Author : Maciej Witold Majewski
language : en
Publisher:
Release Date : 2022
Application Of Machine Learning Methods For The Analysis Of The Calibration Of The Lhcb Velo Detector Studies Of Irradiated Silicon Pixel Sensors And Reconstruction Of The Neutrino Interaction In Lartpc Detector written by Maciej Witold Majewski and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.
Non Invasive Beam Monitoring Using The Lhcb Velo Module At A 40 Mev Proton Beamline
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Author : Roland SCHNUERER
language : en
Publisher:
Release Date : 2017
Non Invasive Beam Monitoring Using The Lhcb Velo Module At A 40 Mev Proton Beamline written by Roland SCHNUERER and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
In proton beam therapy, knowledge of the detailed beam properties is essential to ensure effective dose delivery to the patient. In clinical practice, currently used interceptive ionisation chambers require daily calibration and suffer from slow response time. This contribution presents a new non-invasive method for dose online monitoring. It is based on the silicon multi-strip sensor LHCb VELO (VErtex LOcator), developed originally for the LHCb experiment at CERN. The semi-circular detector geometry offers the possibility to measure beam intensity through halo measurements without interfering with the beam core.Results from initial tests using this monitor in the 40 MeV proton beamline at the University of Birmingham, UK are shown. Synchronised with a Faraday Cup and the RF cyclotron frequency, VELO was used as an online monitor by measuring the beam current at different dose rates in the proton beam halo and this information was used as basis for 2D and 3D beam profiles along the beamline. Experimental results demonstrate the linearity, accuracy, reproducibility and sensitivity of the VELO detector and this is discussed, in comparison with beam tracking simulations. These measurements will direct the implementation of the system at the 60 MeV proton therapy beamline at the Clatterbridge Cancer Centre (CCC), UK where further studies will be performed to fully exploit the potential of the VELO detector as a beam monitor for medical accelerators.
Radiation Damage Studies In The Lhcb Velo Detector And Measurement Of The Flavour Specific Asymmetry In Semileptonic B Decays
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Author : Adam Dane Webber
language : en
Publisher:
Release Date : 2013
Radiation Damage Studies In The Lhcb Velo Detector And Measurement Of The Flavour Specific Asymmetry In Semileptonic B Decays written by Adam Dane Webber and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
This thesis presents several studies of data collected at the LHCb detector during its first two years of operation. A detector upgrade study is first presented, using simulated events at an increased luminosity. A second study involves radiation damage to the silicon sensors of the LHCb Vertex Locator. During 2010 and 2011the silicon sensors were exposed to a range of fluences, with sensors in the mostactive regions exposed to fluences of up to approximately 45x10 12 1MeV neutron equivalent (1MeV neq). The first observation of n+-on-n sensor type inversion at the Large Hadron Collider is reported, occurring at a fluence of around (10-15)x10 12 of 1MeV neq. The effective depletion voltages of the only n+-on-p sensors in use at the Large Hadron Collider have also been studied, with decreases of around 25V observed after initial irradiation. Following this, the effective depletion voltage inn+-on-p type sensors is observed to increase at a comparable rate to type inverted n+-on-n type sensors. A reduction in the charge collection efficiency due to an unexpected effect involving the sensor readout lines is also observed. A third study relates to CP violation in neutral B-meson mixing, by the measurement of the flavour-specific asymmetry. In the Standard Model, CP violation from this source is expected to be of order 10 -4. Any measured enhancement of this would be a strong indication of new physics. The DØ collaboration has measured the flavour specific asymmetry from B0 and B0s mixing, and found it to be inconsistent with the Standard Model at a confidence level of 3.9 standard deviations, thus motivating an independent measurement from the LHCb experiment. Using the full 2011 LHCb dataset, corresponding to 1.0 fb -1 of recorded luminosity, the B0s-meson component of the flavour-specific asymmetry is measured to be afs_s = (-0.12 +/- 0.48 +/- 0.34)%, where the first uncertainty is statistical and the second is systematic. This is the single most accurate measurement of afs_s, and is consistent with both the DØ measurement and the Standard Model prediction.
Luminosity Measurement At The Compact Muon Solenoid Experiment Of The Lhc
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Author : Olena Karacheban
language : en
Publisher: Springer
Release Date : 2018-06-22
Luminosity Measurement At The Compact Muon Solenoid Experiment Of The Lhc written by Olena Karacheban and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-06-22 with Science categories.
This book describes the application of a novel technology for beam instrumentation and luminosity measurement and first results on a cutting edge technology potentially to be used after the upgrade of the Large Hadron Collider to higher luminosity. It presents a unique diamond-based luminometer with a detailed performance study. The online bunch-by-bunch luminosity measurements provide an invaluable feedback to the Collider for beam optimisation and for the understanding of beam dynamics. The precision of the luminosity measurement is crucial for all physics analyses. This book highlights the Van der Meer method, which is used for the calibration of the luminometers of the CMS (Compact Muon Solenoid) experiment, and describes the estimate of systematic uncertainties, e.g. due to radiation damage of sensors and electronics and uncertainties of beam parameters. For the future high-luminosity upgrade of the collider, sapphire sensors are investigated in a test beam. It is demonstrated for the first time that sapphire sensors can be used as single particle detectors. A model for the charge transport in sapphire is developed and successfully applied.
Calibration Of The Lhcb Velo Detector And Study Of The Decay Mode D0 K Mu Nu Mu
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Author : Grant Duncan Mcgregor
language : en
Publisher:
Release Date : 2011
Calibration Of The Lhcb Velo Detector And Study Of The Decay Mode D0 K Mu Nu Mu written by Grant Duncan Mcgregor and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
The LHCb experiment, based at the Large Hadron Collider at CERN, is primarily designed to make precision measurements of the decays of heavy flavour hadrons, such as B and D mesons. This thesis is composed of two parts: the first consists of two studies of LHCb's vertex locator (VELO) and the second describes the development of methods for recording the decay D0->K-mu+nu_mu. The first VELO study involves calibration and monitoring of the gain (i.e. the detector response to input charge from particles). We propose a robust method to measure the gain response of each silicon sensor using calibration bits output by the sensors, and a method to recalibrate the gain simple enough to be followed by non-expert VELO users. This is followed by an investigation into into the prospects of using the VELO to perform particle identification using the characteristic energy deposition of each particle species (dE/dx). Finally, studies into the development of a trigger and a so-called 'stripping line' for recording D0->K-mu+nu_mu decays is presented. The relatively high cross-section for charm decays in LHCb mean this decay (with a branching fraction of 3%) occurs frequently, and the challenge of a trigger is to reduce this to a rate acceptable to write to disk. Finally, based on a sample of data from July and August 2011, the measured q 2 distribution for this decay is compared to the simple single-pole theoretical model, and the pole mass is measured to bem_pole=2.35 + 0.81 - 0.35 GeV/c 2.
The One Armed Atlas Forward Proton Detector
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Author : Ivan López Paz
language : en
Publisher:
Release Date : 2018
The One Armed Atlas Forward Proton Detector written by Ivan López Paz and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with categories.
L'experiment ATLAS al Laboratori Europeu de Física de Partícules (CERN), Ginebra, ha obtingut dades amb èxit des que el Gran Col·lisionador d'Hadrons (LHC en anglès) començà a ser operatiu el 2010. Des de llavors, ha estat generant col·lisions de protó-protó per estudiar les fronteres de la física de partícules, a una energia al centre de masses de, primer 7-8 TeV i més recentment de 13 TeV. Tot i això, l'experiment es troba en evolució constant: la degradació dels detectors a causa de la radiació, l'increment de la freqüència de les col·lisions i nous objectius científics sovint requereixen millores als detectors d'ATLAS. Aquests nous reptes motiven la continuada recerca i el desenvolupament de noves tecnologies de detectors. Per ampliar la recerca de física de partícules a l'experiment, la col·laboració d'ATLAS afegí recentment un detector "forward" per identificar protons emergits de col·lisions al LHC a angles petits. El detector de Protons Difractius d'ATLAS (o AFP, de l'anglès "ATLAS Forward Proton") capacita la identificació de processos difractius i esdeveniments centrals exclusius, permetent per exemple la cerca de noves ressonàncies pesades en esdeveniment nets. L'AFP consisteix en detectors de traces de silici instal·lats a poca distància del feix de protons del LHC i a ̃210 m del punt d'interacció a cada costat d'ATLAS, juntament amb detectors de temps de vol per reduir senyals de fons produïts per l'acumulació de col·lisions. Els detectors de silici han de demostrar la suficient resistència a la radiació, una bona resolució espacial i els requeriments d'àrea activa necessaris per AFP. La tecnologia de sensors de píxels 3D, primerament utilitzada en el detector IBL d'ATLAS, ha sigut desenvolupat i qualificat per AFP. El "detector AFP d'un braç", en el qual aquesta tesi està basada, es refereix a l'etapa en la qual el detector AFP consistia només de detectors de traces de silici en un dels costats d'ATLAS, que va ser instal·lat a principis de 2016. La instal·lació es va completar un any després, quan tant els detectors de traces com els de temps de vol es van instal·lar als dos costats d'ATLAS. Aquesta tesi descriu el procés complet de caracterització de la tecnologia del detector de traces de silici, producció, instal·lació i anàlisi de dades del detector AFP en la seva primera etapa.
Study Of Double Charm B Decays With The Lhcb Experiment At Cern And Track Reconstruction For The Lhcb Upgrade
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Author : Renato Quagliani
language : en
Publisher: Springer
Release Date : 2018-11-04
Study Of Double Charm B Decays With The Lhcb Experiment At Cern And Track Reconstruction For The Lhcb Upgrade written by Renato Quagliani and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-11-04 with Science categories.
This book discusses the study of double charm B decays and the first observation of B0->D0D0Kst0 decay using Run I data from the LHCb experiment. It also describes in detail the upgrade for the Run III of the LHCb tracking system and the trigger and tracking strategy for the LHCb upgrade, as well as the development and performance studies of a novel standalone tracking algorithm for the scintillating fibre tracker that will be used for the LHCb upgrade. This algorithm alone allows the LHCb upgrade physics program to achieve incredibly high sensitivity to decays containing long-lived particles as final states as well as to boost the physics capabilities for the reconstruction of low momentum particles.