Future Plans of the ATLAS Collaboration for the HL-LHC

With the already outstanding LHC luminosity performance, and planned LHC upgrades in the upcoming shutdowns, it is expected that within a short time-scale, the general purpose LHC experiments will have to cope with luminosities beyond their original design. In order to maintain detector performance and sensitivity to expected and new physics processes, ATLAS has defined a continuous upgrade programme which foresees staged enhancements during the next 10 years of operation, and then more widespread changes before the transition to the highest luminosities after 2024. This talk will describe several components of the ATLAS upgrade, focusing in particular on the systems for acquiring large samples of data for the study of benchmark physics processes. The detector systems face two challenges in the higher luminosity environment: high particle occupancies and increased radiation dose. These will be addressed by a complete replacement of the inner detector and the readout electronics of the calorimeter and muon detectors. The Trigger faces an increasingly difficult task of distinguishing events of interest from a background of up to 200 proton collisions per bunch crossing at the highest luminosity. Plans include new muon trigger chambers, higher granularity calorimeter trigger information and eventually the introduction of a track trigger at Level-1.