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Operation of the 4-Layer ATLAS Pixel Detector

In 2015 the ATLAS Pixel Detector has been re-commissioned after the insertation of the IBL and the repair of the original pixel detector. More than 97% of the original pixel detector modules and 100% of the IBL were operational at the end of the LS1.  92 million readout channels have beeing calibrated and tuned to ensure an error free and noise suppressed readout. The complex environment like the two different cooling systems holding the entire active volume below 0°C must be operated smoothly for longer terms and the readout of the IBL have been integrated into the ATLAS readout and trigger system.

The enhanced 4-Layer ATLAS Pixel Detector is working with remarkable performance during data taking. In cosmic runs of ATLAS in October 2014 first tracks have been recorded successfully. In Fig. 1 a track through the ATLAS Inner Detector has been reconstructed showing that the upgraded pixel detector is now measuring 4 space points per track!

In Fig. 2 a typtical track reconstruction is shown for an event during the operation of the ATLAS detector in 2015 with the installed IBL.

cosmic_ray_track

Fig. 1: Cosmic ray track recorded with ATLAS showing hits in the strip, pixel and the new IBL pixel detector layer, recorded in May 2015.

 

atlas_event_ibl

Fig. 2: Reconstructed tracks recorded with ATLAS in May 2015, showing hits in the strip, pixel and the new IBL pixel detector layer.

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