Speaker
Description
The High Luminosity program of the Large Hadron Collider (HL-LHC) will
increase the beam's instantaneous luminosity up to $7.5\cdot 10^{34} cm^{-2} s^{-1}$.
An upgrade of the ATLAS tracking detector, the Inner Tracker (ITk), is
needed to cope with the resulting harsher radiation levels and number of
tracks.
The outermost layers of the ITk pixel detector are designed to operate
for the entire lifetime of the HL-LHC. The innermost layer, instead,
will be exposed to a fluence up to almost $2\cdot10^{16} n_{eq}/cm^2$ (including
safety factor) and is scheduled to be replaced after half of the HL-LHC
program.
Planar silicon sensors will be used in most of the detector, while the
innermost layer will be populated with 3D silicon sensors due to their
inherent radiation hardness.
As long as pre-production sensors of different types and readout ASICs
are becoming available, they are being tested in test beams both
unirradiated and after irradiation.
A summary of recent results of the ATLAS ITk Pixel detector test beam
campaigns will be presented.
