Mechanical studies towards a silicon micro-strip super module for the ATLAS inner detector upgrade at the high luminosity LHC

It is expected that after several years of data-taking, theLarge Hadron Collider (LHC) physics programme will be extended tothe so-called High-Luminosity LHC, where the instantaneousluminosity will be increased up to 5 × 1034 cm−2 s−1. For the general-purpose ATLASexperiment at the LHC, a complete replacement of its internaltracking detector will be necessary, as the existing detector willnot provide the required performance due to the cumulated radiationdamage and the increase in the detector occupancy. The baselinelayout for the new ATLAS tracker is an all-silicon-based detector,with pixel sensors in the inner layers and silicon micro-stripdetectors at intermediate and outer radii. The super-module(SM) is an integration concept proposed for the barrel stripregion of the future ATLAS tracker, where double-sided stereosilicon micro-strip modules (DSM) are assembled into a low-masslocal support (LS) structure. Mechanical aspects of the proposed LSstructure are described.