Abstract
Abstract The ATLAS Pixel Detector is the innermost detector of the ATLAS Experiment at the Large Hadron Collider at CERN. It consists of 1744 silicon sensors equipped with approximately 80 million electronic channels, providing typically three measurement points with high resolution for particles emerging from the beam-interaction region, thus allowing to measure particle tracks and secondary vertices with very high precision. In the following, the performance reached by the Pixel Detector with LHC collision data will be presented, with particular attention to its spatial resolution, efficiency, particle identification properties and the Lorentz angle measurement. Offline calibration procedures and optimization techniques will be discussed in detail.
Highlights
Noise mask Charge sharing calibration Performance Spatial resolution Hit-to-track association efficiency Lorentz angle measurement Specific energy loss measurement
80 M channels Sensor thickness: 250 μm 50 μm (RΦ) × 400 μm (η) 328 rows × 144 columns bias voltage: 150 V Three precise measurement points up to ⏐ η⏐ < 2.5: RΦ resolution ∼10 μm η (R or z) resolution ∼115 μm Detector operates in an environmental temperature of about -15° C and within a 2 T solenoidal magnetic field
The Pixel Detector has changed its operational temperature during the different running periods
Summary
250 μm 50 μm (RΦ) × 400 μm (η) 328 rows (xlocal) × 144 columns (ylocal) bias voltage: 150 V Three precise measurement points up to ⏐ η⏐ < 2.5: RΦ resolution ∼10 μm η (R or z) resolution ∼115 μm Detector operates in an environmental temperature of about -15° C and within a 2 T solenoidal magnetic field
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