21-25 June 2021
Clarion Congress Hotel Prague
Europe/Prague timezone
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A High-Granularity Timing Detector for the Phase-II upgrade of the ATLAS Calorimeter system: detector concept, description and R&D and beam test results

Not scheduled
20m
3rd floor (Clarion Congress Hotel Prague)

3rd floor

Clarion Congress Hotel Prague

Freyova 945/33, 190 00 Prague 9 - Vysočany
Oral presentation 11 Current Trends in Development of Radiation Detectors

Speaker

Dr ANDEEN, Tim (CERN)

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.

Primary author

Dr ANDEEN, Tim (CERN)

Presentation Materials

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