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The original three layer ATLAS Pixel Detector

The original ATLAS Pixel Detector was developed for about 10 years and finally installed into ATLAS during 2006 and 2007. The smallest mechanical and electric units of the pixel detector are modules of 16.4mm × 60.4mm size. The whole pixel detector is built up of about 1744 modules. Each pixel module (see Fig. 1) consists of a silicon sensor with approx. 47000 pixel, 16 front end chips, a high density interconnect (flex) and a module control chip (MCC). It features a very compact design together with very low mass of about 2.2g. The connection to the outer world is done via a so-called pig-tail which hosts a small connector for the supply voltages as well as for the I/O signals.



Fig. 1: Explosion view of an ATLAS pixel module.


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

During the development and the production of the ATLAS Pixel Detector our main contributions were the design, testing and quality assurance of the FE electronics and the module hybridization and assembly. For instance half of the FE chips has been probed prior and after bump bonding as well as more than 500 modules have assembled and tested in Bonn.

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