Speaker
Description
The HGTD is a novel detector introduced by ATLAS to augment the new all-silicon Inner Tracker (ITk) in the pseudorapidity range from 2.4 to 4.0, adding the capability to measure charged-particle trajectories in time as well as space. Two double-sided layers of silicon sensors will provide precision timing information for charged particles with a resolution as good as 30 ps per track to help assign each particle to the correct vertex, recovering the ATLAS reconstruction performance at HL-LHC, enhancing the experiment’s pile-up rejection and providing bunch-by-bunch luminosity measurements. Readout cells have a size of 1.3mm x 1.3 mm, leading to a highly granular detector with ~3.7 million channels. Low-Gain Avalanche Detectors (LGAD) technology has been chosen as it provides enough gain to reach the large signal over noise ratio needed. The requirements and overall specifications of the HGTD will be presented as well as the technical design and the project status. The R&D efforts on the detector components and construction, supported by laboratory and test beam results, will also be presented.