Abstract
The CMS Silicon Strip Tracker (SST), comprising 9.6 million readout channels from 15148 modules covering an area of about 200 m², needs to be precisely calibrated in order to correctly interpret and reconstruct the events recorded from the detector, ensuring that the SST performance fully meets the physics research program of the CMS experiment. Calibration constants may be derived from promptly reconstructed events as well as from pedestal runs gathered just before the acquisition of physics runs. These calibration procedures were exercised in summer and winter 2009, when the CMS detector was commissioned using cosmic muons and proton–proton collisions at a center-of-mass energies of 900 GeV and 2.36 TeV. During these data taking periods the performance of the SST was carefully studied: the noise of the detector, the data integrity, the signal-to-noise ratio, the hit reconstruction efficiency, the calibration workflows have been all checked for stability and for different conditions, at the module level. The calibration procedures and the detector performance results from recent physics runs are described.
Highlights
The CMS Silicon Strip Tracker (SST), comprising 9.6 million readout channels from 15148 modules covering an area of about 200 m2, needs to be precisely calibrated in order to correctly interpret and reconstruct the events recorded from the detector, ensuring that the SST performance fully meets the physics research program of the CMS experiment
These calibration procedures were exercised in summer and winter 2009, when the CMS detector was commissioned using cosmic muons and proton-proton collisions at a center-of-mass energies of 900 GeV and 2.36 TeV
The SST consists of 4 subsystems: the Inner Barrel (TIB), the Inner Disks (TID), the Outer Barrel (TOB) and the End Caps (TEC)
Summary
The CMS detector [1] consists of the following major sub-systems: pixel and silicon strip trackers, a lead-tungstate crystal electromagnetic calorimeter, a brass sampling hadron calorimeter and a muon spectrometer. It is built around a superconducting solenoid magnet generating a magnetic field of 3.8 Tesla. The modules in the first two layers of the TIB, the first two layers of the TOB, rings 1 and 2 of the TIB, and rings 1, 2, and 5 of the TEC have a second micro-strip detector module which is mounted back-to-back with a stereo angle of 100 mrad to provide a measurement of the second coordinate (z in the barrel and r on the disks). The CMS tracker is equipped with a C6F14 liquid cooling system
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