Feb 18 – 22, 2019
Vienna University of Technology
Europe/Vienna timezone

Upgrade of the ATLAS Muon Spectrometer Thin Gap Chambers and their electronics for the HL-LHC phase

Feb 21, 2019, 9:50 AM


Talk Gaseous Detectors Gas Detectors


Chav Chhiv Chau (Carleton University (CA))


The instantaneous luminosity of the LHC will be increased by almost an order of magnitude
with respect to the design value by undergoing an extensive upgrade program for the
High-Luminosity LHC (HL-LHC). Many upgrades are foreseen for the thin gap chambers
(TGC) of the ATLAS Muon System. A Phase-I upgrade project is the replacement of the
present first station in the forward regions with the New Small Wheels (NSWs). Along with
Micromegas, the NSWs are equipped with 8 layers of small-strip thin gap chambers (sTGC)
arranged in multilayers of two quadruplets, for a total active surface of more than 2500
m$^2$. The spatial resolution has to be better than 100 μm per sTGC plane to allow the
trigger track segments to be reconstructed with an angular resolution of 1 mrad. At Phase-II,
the TGC at larger radius from the beam line than the NSW will also be replaced with triplet
chambers with finer granularity. Another Phase-II upgrade project is the replacement of the
TGC trigger and readout electronics. The first prototype of the frontend board has been
developed and tested at the CERN SPS with functions required for the HL-LHC including
data transfer of 256 channels at 16 Gbps. The new trigger algorithm has been validated with
data, and was found to reduce the event rate by 30% while increasing the efficiency by a few
percent. The design, performance and status of the ATLAS TGC upgrade projects will be
discussed, along with results from tests of the chambers or prototypes with beams.

Primary author

Chav Chhiv Chau (Carleton University (CA))

Presentation materials