Laboratoire d'Annecy de Physique des Particules
Science

Large Hardon Collider prepares for Run 3

After over two years of upgrades and maintenance works, the first pilot beams on 19 October 2021 mark an important step in resuming physics data-taking at CERN next year.

From 26 October to November 1st, LHC provided first test collisions at the injection energy of 450 GeV per beam to its experiments. LAPP scientists participate in two of the LHC experiments: LHCb and ATLAS, both of which got a makeover in preparation for Run 3.

A new LHCb detector has been born for Run 3. Different parts (“sub-detectors”) of LHCb have been replaced or improved. Particularly, the rate of data taking will be 30 times faster using new electronic cards transmitting data between LHCb detector and computer farm, programmed differently for different sub-detectors. The LHCb LAPP team coordinated this programming effort and wrote the common software used by all sub-detectors. The whole system has been tested for the first time during pilot run and worked perfectly.

For Run 3 ATLAS LAPP team worked on new electronics to achieve a better granularity of the electromagnetic calorimeter’s trigger. This new digital trigger performed well during the data-taking. The ATLAS experiment collected more data than originally planned. These first data will help us to restart the ATLAS detector after a break of more than three years.

Congratulations to the teams!

Figure shows the event display recorded in ATLAS on 29 October 2021 during the LHC pilot beam test. Starting from the center of the ATLAS detector, the hits and reconstructed tracks of the charged particles in the Inner Detector are shown as dots and colored lines, respectively. The energy deposits in the LAr calorimeter (the green layer) and Tile calorimeter (the red layer) are shown as yellow boxes. The reconstructed track segments and their associated hits in the Muon Spectrometer (the outer blue layer) are shown as green lines and yellow blocks, respectively.

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Contacts : Tetiana Berger-Hryn’ova (ATLAS) et Bolek Pietrzyk (LHCb)