Detector Seminar

# The ATLAS New Small Wheel Upgrade Project

## by Stephanie Ulrike Zimmermann (Albert-Ludwigs-Universitaet Freiburg (DE))

Friday, 11 July 2014 from to (Europe/Zurich)
at CERN ( 40-S2-A01 - Salle Anderson )
 Description Over the next decade, the LHC instantaneous luminosity is expected to reach up to 5 times the design value of 10^34 s-1 cm-2 in connection with the HL-LHC upgrade program. In parallel to the LHC upgrade, the ATLAS detector will undergo an extensive upgrade program, in order to cope with the increase in rates and particle flux, and to preserve the excellent performance of run-1 also for the challenging high luminosity regime. The largest upgrade activity for the Muon Spectrometer is the replacement of the innermost stations of the endcaps with the New Small Wheels (NSW), to be installed in the 2018/19 LS2 shutdown. The NSWs consist of eight layers each of Micromegas and small-strip Thin Gap Chambers (sTGC), both providing trigger and tracking capabilities, for a total active surface of more than 2500 m2. It represents the first system with such a large size based on Micro Pattern (Micromegas) and wire detectors (sTGC). This seminar will give an overview over the motivation for the NSW upgrade, and discuss the chosen detector technologies. Detector performance, chamber construction, prototype results as well as the architecture of the NSW electronics will be described. The talk will further cover the challenges of the NSW mechanical design, and present the current status of the project.  Material: Organised by F. Hahn