The HL-LHC Upgrade of the ATLAS hadronic Tile Calorimeter

The High-Luminosity phase of LHC, scheduled to begin in late 2027, will deliver up ten times the LHC nominal instantaneous luminosity experiments. To ensure sound performance under higher pile-up and radiation conditions, ATLAS hadronic Tile Calorimeter (TileCal) replace both on- off- detector electronics systems during long shutdown 3 (2025-2027). upgraded front-end system continuously digitize read out shaped photomultiplier tube (PMT) signals from every TileCal cell at a rate 40 MHz, transmitting them over high-speed fiber links new back-end be stored latency pipelines digitally summed produce improved trigger tower data for Level-1 trigger. are based on radiation-qualified commercial components, use extensive redundancy minimize single point failures. upgrade program has undergone R&D beam tests, “demonstrator” module was installed 2019 integration testing actual environment.