Speaker
Description
The increase of the particle flux (pile-up) at the HL-LHC with luminosities of L ≃ 7.5 ×
10$^{34}$ cm$^{−2}$s$^{−1}$ will have a severe impact on the ATLAS detector reconstruction and trigger
performance. The end-cap and forward region where the liquid Argon calorimeter has
coarser granularity and the inner tracker has poorer longitudinal vertex position resolution
will be particularly affected. A High Granularity Timing Detector (HGTD) is proposed in
front of the LAr end-cap calorimeters for pile-up mitigation and for luminosity
measurement.
It will cover the pseudo-rapidity range from 2.4 to 4.0. Two Silicon sensors double sided
layers will provide precision timing information for MIPs with a resolution better than 30 ps
per track in order to assign each particle to the correct vertex. Readout cells have a size of 1.3
mm × 1.3 mm, leading to a highly granular detector with 3 millions of channels. Low Gain
Avalanche Detectors (LGAD) technology has been chosen as it provides enough gain to reach
the large signal over noise ratio needed. A dedicated ASIC is being developed and some
prototypes have been already submitted and measured
The requirements and overall specifications of the HGTD will be discussed. LGAD R&D
campaigns are carried out to study the sensors, the related ASICs, and the radiation
hardness. Laboratory and test beam results will be presented.
