Speaker
Ryne Michael Carbone
(Columbia University (US))
Description
The upgrade of the LHC will bring instantaneous and total
luminosities which are a factor 5-7 beyond the original design of the
ATLAS Liquid Argon (LAr) and Tile Calorimeters and their read-out
systems. Due to radiation requirements and a new hardware
trigger concept the read-out electronics will be improved in two
phases. In Phase-I, a dedicated read-out of the LAr Calorimeters will
provide higher granularity input to the trigger, in order to mitigate
pile-up effects and to reduce the background rates. In Phase-II,
completely new read-out electronics will allow a digital processing of
all LAr and Tile Calorimeter channels at the full 40 MHz bunch-crossing
frequency and a transfer of calibrated energy inputs to the
trigger. Results from system design and performance of the developed
read-out components, including fully functioning demonstrator systems
already operated on the detector, will be reported.
Furthermore, the current Forward Calorimeter (FCal) may suffer from signal
degradation and argon bubble formation at highest instataneous luminosities.
A high-granularity replacement is thus proposed, improving on reconstruction
of jets and missing energy in the presence of pile-up. The corresponding R&D
and expected performance results will be presented.
Another upgrade project that is under consideration is a high-granularity
timing-device in front of the end-cap/forward calorimeters to help particle
identification and pile-up mitigation. The R&D work on this project will be
also presented.
