Editing ATLAS experiment (section)

====Pixel Detector====
The Pixel Detector,<ref>{{cite journal|title=The ATLAS pixel detector|author=Hugging, F.|journal=IEEE Transactions on Nuclear Science|year=2006|volume=53|issue=6|doi=10.1109/TNS.2006.871506|pages=1732–1736|arxiv = physics/0412138 |bibcode = 2006ITNS...53.1732H |s2cid=47545925}}</ref> the innermost part of the detector, contains four concentric layers and three disks on each end-cap, with a total of 1,744&nbsp;''modules'', each measuring 2&nbsp;centimetres by 6&nbsp;centimetres.  The detecting material is 250&nbsp;μm thick [[silicon]].  Each module contains 16 readout [[computer chip|chips]] and other electronic components. The smallest unit that can be read out is a pixel (50 by 400&nbsp;micrometres); there are roughly 47,000&nbsp;pixels per module.

The minute pixel size is designed for extremely precise tracking very close to the interaction point.  In total, the Pixel Detector has over 92 million readout channels, which is about 50% of the total readout channels of the whole detector. Having such a large count created a considerable design and engineering challenge. Another challenge was the [[radiation]] to which the Pixel Detector is exposed because of its proximity to the interaction point, requiring that all components be [[radiation hardened]] in order to continue operating after significant exposures.