Abstract
While the Large Hadron Collider (LHC) at CERN is continuingto deliver a steadily increasing luminosity to the experiments, plansfor an upgraded machine called the High Luminosity-LHC (HL-LHC) areprogressing. The upgrade is foreseen to increase the LHC designintegrated luminosity by a factor ten. The ATLAS experiment will needto build a new tracker for HL-LHC operation, which needs to be suitedto the harsh HL-LHC conditions in terms of particle rates andradiation doses. In order to cope with the increase in pile-upbackgrounds at the higher luminosity, an all-silicon detector is beingdesigned. To successfully face the increased radiation dose andoccupancy, a new generation of extremely radiation hard silicondetectors has been designed. This paper, will give an overview of theATLAS tracker upgrade project, in particular focusing on the crucialinnermost silicon strip layers. Results from a wide range ofirradiated silicon detectors will be presented, and layout conceptsfor lightweight yet mechanically very rigid detector modules with highservice integration will be shown. We will draw conclusions on whattype and design of strip detectors to employ for the upgrades of thetracking layers in the HL-LHC upgrades of LHC experiments.
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