Commissioning of the ATLAS Muon Spectrometer with cosmic rays

“…The gas monitor system produces RT functions every two hours from an auto-calibration procedure (Gas Monitor RT Function Generation section II.2.C). The twelve RT functions generated daily are averaged into a universal RT function, URT [13]. Typically, MDT calibration constants are required with 24-hour latency.…”

Section: Daily Proceduresmentioning

confidence: 99%

Streamlined calibrations of the ATLAS precision muon chambers for initial LHC running

Amram¹,

Ball²,

Benhammou³

et al. 2012

Nuclear Instruments and Methods in Physics Research Section A:

Self Cite

View full text Add to dashboard Cite

-The ATLAS MuonSpectrometer is designed to measure the momentum of muons with a resolution of dp/p = 3% and 10% at 100 GeV and 1 TeV momentum respectively. For this task, the spectrometer employs 355,000 Monitored Drift Tubes (MDTs) arrayed in 1200 Chambers. Calibration (RT) functions convert drift time measurements into tube-centered impact parameters for track segment reconstruction. RT functions depend on MDT environmental parameters and so must be appropriately calibrated for local chamber conditions. We report on the creation and application of a gas monitor system based calibration program for muon track reconstruction in the LHC startup phase.

show abstract

“…Four primary subsystems comprise the integrated muon spectrometer: monitored drift tubes (MDT), cathode strip chambers (CSC), resistive plate chambers (RPC) and thin gap chambers (TGC). The MDT and CSC subsystems are primarily designed for precision measurements of muon tracks, with the MDT system providing coverage for the more central region (|η| < 2.7, with full coverage only in |η| < 2.0), whereas the CSC is located in the more forward region (2.0 < |η| < 2.7) due to its ability to cope with higher background rates [182]. The RPC and TGC muon subsystems are designed to provide fast, robust readout for use in the trigger and data acquisition system (Section 4.4).…”

Section: Muon Spectrometer Systemmentioning

confidence: 99%

“…Studies of the muon reconstruction efficiency and tracking performance of the spectrometer were carried out using cosmic ray data collected in 2008 and 2009 [182].…”

Section: Muon Spectrometer Systemmentioning

confidence: 99%

Measurement of Hadronic Event Shapes and Jet Substructure in Proton-Proton Collisions at 7.0 TeV Center-of-Mass Energy with the ATLAS Detector at the Large Hadron Collider

Miller¹

2012

View full text Add to dashboard Cite

This thesis presents the first measurement of 6 hadronic event shapes in proton-proton collisions at a center-of-mass energy of √ s = 7 TeV using the ATLAS detector at the Large Hadron Collider. Results are presented at the particle-level, permitting comparisons to multiple Monte Carlo event generator tools. Numerous tools and techniques that enable detailed analysis of the hadronic final state at high luminosity are described. The approaches presented utilize the dual strengths of the ATLAS calorimeter and tracking systems to provide high resolution and robust measurements of the hadronic jets that constitute both a background and a signal throughout AT-LAS physics analyses. The study of the hadronic final state is then extended to jet substructure, where the energy flow and topology within individual jets is studied at the detector level and techniques for estimating systematic uncertainties for such measurements are commissioned in the first data. These first substructure measurements in ATLAS include the jet mass and sub-jet multiplicity as well as those concerned with multi-body hadronic decays and color flow within jets. Finally, the first boosted hadronic object observed at the LHC -the decay of the top quark to a single jet -is presented. PrefaceThe Large Hadron Collider (LHC) is the largest machine ever built by humankind and is designed to accelerate protons to the highest energies ever produced on Earth.This fact alone merits respect and awe of the infinite creativity and willingness of humans to believe that they can achieve the impossible in order to understand the unknowable. The possibility to study the properties of the interactions that such a machine produces is truly a once in a lifetime opportunity.The work constituted by this thesis represents an endeavor to understand the way that quarks and gluons -the partons that were at one time only a theoretical "convenience" for Richard Feynman, Murray Gell-Mann and George Zweig -evolve to form experimental signatures in our detectors, the jets of the so-called hadronic final state. But the LHC is a unique machine, producing a complex environment in which these signatures are manifested. As a result, techniques must be developed to tease out the interesting physics buried within a complex milieu created by the enormous energy and intensity of the LHC. This thesis is at least in part devoted to describing those tools, some of which have since come to be used in analyses measuring the top quark, the W boson, and searches for new physics throughout ATLAS.An attempt is made to draw a connection among the many studies performed throughout the initial phases of the ATLAS experiment. Critical efforts during the commissioning of the detector, the first acquisition of √ s = 900 GeV and then √ s = 7 TeV data, and the full-fledged analysis of the full 2010 dataset, are all tied together by a common thread: the ability to utilize the largest and most advance instruments ever built in a coherent manner to understand the highest energy collisions of the sm...

show abstract

Commissioning of the ATLAS Muon Spectrometer with cosmic rays

Cited by 31 publications

References 14 publications

Searches for Natural Supersymmetry in Hadronic Final States with Heavy Flavor at ATLAS

Searches for Natural Supersymmetry in Hadronic Final States with Heavy Flavor at ATLAS

Streamlined calibrations of the ATLAS precision muon chambers for initial LHC running

Measurement of Hadronic Event Shapes and Jet Substructure in Proton-Proton Collisions at 7.0 TeV Center-of-Mass Energy with the ATLAS Detector at the Large Hadron Collider

Contact Info

Product

Resources

About