Abstract
After the successful operation at the centre-of-mass energies of 7 and 8 TeV in 2010-2012, the LHC was ramped up and successfully took data at the centre-of-mass energies of 13 TeV in 2015 and 2016. Meanwhile, plans are actively advancing for a series of upgrades of the accelerator, culminating roughly ten years from now in the high-luminosity LHC (HL-LHC) project, which will deliver of the order of five times the LHC nominal instantaneous luminosity along with luminosity levelling. The ultimate goal is to extend the dataset from about few hundred fb−1 expected for LHC running by the end of 2018 to 3000 fb−1 by around 2035 for ATLAS and CMS. The challenge of coping with the HL-LHC instantaneous and integrated luminosity, along with the associated radiation levels, requires further major changes to the ATLAS detector. The designs are developing rapidly for a new all-silicon tracker, significant upgrades of the calorimeter and muon systems, as well as improved triggers and data acquisition. ATLAS is also examining potential benefits of extensions to larger pseudorapidity, particularly in tracking and muon systems. This report summarizes various improvements to the ATLAS detector required to cope with the anticipated evolution of the LHC luminosity during this decade and the next. A brief overview is also given on physics prospects with a pp centre-of-mass energy of 14 TeV.
Highlights
Detector upgrades- Trigger and data acquisition system - Muon detector - Tracking - CalorimeterPhysics prospects- Physics performance of physics objects - Higgs measurements - Standard Model studies - Beyond Standard Model searches
During LS2, the upgrade of several detector systems is foreseen and it will function as a foundation for the HL-LHC upgrades: the upgrades of the calorimeter trigger system and of the associated Liquid Argon (LAr) trigger electronics, the New Small Wheel (NSW) and the Fast TracKer trigger (FTK)
Many studies and possible detector designs were published for the HL-LHC upgrade, the most recent being the Scoping Document (LHCC-G-166) and the notes for this year's workshop of the European Committee for Future Accelerators (ECFA)
Summary
LHC has had a successful Run so far, with good operation and many physics results published with the newly recorded data by all experiments The aim of the detector upgrades is to achieve a similar or better performance than with the current design, even in the presence of high pileup rates. The current ATLAS detector electronics was designed to buffer data for a maximal latency of 2.5 μs and cope with Level-1 trigger rates up to 100 kHz. For Phase-II Upgrade, Level-0 trigger will be introduced to accommodate latencies less than 6 μs and rates up to 1 MHz, with the L1 rates going up to 400 kHz. L0 trigger will have two components: L0 Muon Triggers and L0 Calorimeter Triggers. The ATLAS event size is expected to increase from the current 1.5 MB to approximately 5 MB, leading to a trigger rate a factor of 4 larger than today. The expected recording rate will be 5-10 kHz, leading to output rates of 1-2.2 kHz each for electrons with pT > 22 GeV and for muons with pT > 20 GeV
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