Speaker
Description
The increased particle flux at the HL-LHC poses a significant challenge to the
ATLAS detector’s performance, particularly in the forward region which has reduced
detector granularities. To address this challenge, ATLAS is adding the High-
Granularity Timing Detector (HGTD), utilizing novel Low-Gain Avalanche Detector
(LGAD) silicon technology. The HGTD will provide capabilities for pileup mitigation
and precise luminosity measurements, complementing the new all-silicon Inner
Tracker in the pseudo-rapidity range of 2.4 to 4.0. Two double-sided layers of the
HGTD, with a total of 3.7 million 1.3×1.3 mm² pixels, will provide a timing resolution
of better than 50 ps/track throughout the HL-LHC operational period. This allows
improving the assignment of tracks to their correct vertices based on timing
information, by discerning the pp interactions happening in each bunch crossing in
the temporal dimension. A comprehensive overview will be provided, outlining the
requirements, technical designs, recent results from preproduction sensors and
readout electronics modules, and the project’s status.
