The ATLAS Pixel Detector

The innermost tracking detector of ATLAS will be a semiconductor pixel detector consisting of three barrel layers around the beam axis and three disks in each direction along the beam axis (see image below). The smallest mechanical units of the pixel detector will be modules of about 16mm × 60mm. The whole pixel detector will be built up of about 1750 modules. For the barrel region they will be arranged in staves of 13 modules each. Every disk will consist of 8 sectors with 6 modules each.

The ATLAS Pixel Detector

Each module consists of a silicon sensor with approximately 47000 pixels, 16 front end chips, and a module controller chip. Every front end chip has 2880 channels to amplify the signals from the sensor pixels, digitize them, and send the data to the module controller chip in case a trigger signal occurs at the correct time. The module controller chip serializes the data of the front end chips and sends them via optical links to the off-detector electronics. Furthermore, it is used to generate the control signals for all front end chips of the module.

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Last Modification: Juli 16, 2004