Precise Mapping of the Magnetic Field in the CMS Barrel Yoke using Cosmic Rays

Abstract

The CMS detector is designed around a large 4 T superconducting solenoid, enclosed in a 12000-tonne steel return yoke. A detailed map of the magnetic field is required for the accurate simulation and reconstruction of physics events in the CMS detector, not only in the inner tracking region inside the solenoid but also in the large and complex structure of the steel yoke, which is instrumented with muon chambers. Using a large sample of cosmic muon events collected by CMS in 2008, the field in the steel of the barrel yoke has been determined with a precision of 3 to 8% depending on the location.

References in corpus (8)

• Alignment of the CMS Silicon Tracker during Commissioning with Cosmic Rays
• Performance of CMS Muon Reconstruction in Cosmic-Ray Events
• Commissioning of the CMS Experiment and the Cosmic Run at Four Tesla
• Performance of the CMS Drift Tube Chambers with Cosmic Rays
• Alignment of the CMS Muon System with Cosmic-Ray and Beam-Halo Muons
• Aligning the CMS Muon Chambers with the Muon Alignment System during an Extended Cosmic Ray Run
• Measurement of the CMS Magnetic Field
• Parametrization of the Cosmic Muon Flux for the Generator CMSCGEN

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• J/psi and psi(2S) production in pp collisions at sqrt(s) = 7 TeV
• Performance of CMS Muon Reconstruction in Cosmic-Ray Events
• Commissioning of the CMS Experiment and the Cosmic Run at Four Tesla
• Measurement of the charge ratio of atmospheric muons with the CMS detector
• Alignment of the CMS tracker with LHC and cosmic ray data
• Alignment of the CMS Muon System with Cosmic-Ray and Beam-Halo Muons
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• Design and Description of the CMS Magnetic System Model
• Using the Standard Linear Ramps of the CMS Superconducting Magnet for Measuring the Magnetic Flux Density in the Steel Flux Return Yoke
• Development of the CMS Magnetic Field Map