Abstract
The primary goal of the ATLAS inner detector (ID) is to accurately measure the trajectories of charged particles in the high particle density environment of the large hadron collider (LHC) collisions. This is achieved using a combination of different technologies, including silicon pixels, silicon microstrips, and gaseous drift-tubes, all immersed in a 2Tesla magnetic field. With nearly 750k alignable degrees of freedom, it is crucial that an accurate model of the detector positions be produced using an automated and robust algorithm in order to achieve good tracking performance. This has been accomplished using a variety of alignment techniques resulting in near optimal hit and momentum resolutions.
Highlights
The primary goal of the ATLAS Inner Detector (ID) is to measure the trajectories of charged particles in the high particle density environment of the Large Hadron Collider (LHC) collisions
- 1744 modules - Active element size: 50 μm × 400 μm - 80 M channels - Arranged in 3 barrel layers and 3 endcap rings per side - Expected resolution: 10 μm × 115 μm - Number of hits per track: 3 - Alignable DoF: 10,464
- 4088 modules - Active element size: 80 μm × 12 cm - 6 M channels - Arranged in 4 barrel layers and 9 endcap rings per side - Expected resolution: 17 μm × 580 μm - Number of hits per track: 8 - Alignable DoF: 24,528
Summary
The primary goal of the ATLAS Inner Detector (ID) is to measure the trajectories of charged particles in the high particle density environment of the Large Hadron Collider (LHC) collisions This is achieved using a combination of different technologies, including silicon pixels, silicon microstrips, and gaseous drift-tubes, all immersed in a 2 Tesla magnetic field. With nearly 750k alignable degrees of freedom, it is crucial that an accurate model of the detector positions be produced using an automated and robust algorithm in order to achieve good tracking performance. This has been accomplished using a variety of alignment techniques resulting in near optimal hit and momentum resolutions
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