The subterranean ballet of ALICE | 3/20/2019 | Staff
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The experiment caverns of the Large Hadron Collider (LHC) are staging a dazzling performance during Long Shutdown 2 (LS2). The resplendent sub-detectors, released from their underground homes, are performing a fascinating ballet. At the end of February, ALICE removed the two trackers, the inner tracker system and the time projection chamber, from the detector. At the very start of the long shutdown, on 3 December 2018, the teams began disconnecting the dozens of sub-detectors. And finally, on 25 February, the two trackers were ready to be removed.

The trackers are located around the collision points and are used to reconstruct the tracks of the particles produced in the collisions. The data they generate are essential for identifying the particles and understanding what happened during the collision. ALICE's inner tracker is a 1.5-metre-long tube, 1 metre in diameter. It will be replaced with a new, much more precise detector closer to the collision point, formed of seven pixel layers and containing a total of 12.5 billion pixels....
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