Speaker
Description
For the Long Shutdown 3 of the LHC the ALICE experiment is foreseeing an
upgrade of the inner barrel of its Inner Tracking System: the ITS3.
This new vertex detector is based on Monolithic Active Pixel Sensors
produced in a commercial 65 nm CMOS
technology. Each half layer is realized with a single stitched sensor of
26 cm in length and ≤ 50µm in thickness bent to form a half cylinder
and held in place with carbon foam supports. The detector is air cooled
allowing for an extremely low material budget of 0.07 X/X0 per layer. With
respect to the current ALICE vertex detector, ITS3 will improve the
pointing resolution by a factor of two and the tracking efficiency by 30%
for hadrons of low transverse momentum.
Parallelly, ALICE is designing a next generation heavy-ion experiment for
LHC Run 5 and 6.
Its tracking system will be based on a vertex detector, integrated in a
retractable structure inside the beam pipe to achieve the best possible
pointing resolution, and a very-large-area outer tracker, surrounding the
vertex detector and covering about 8 units of pseudorapidity.
Both systems will be based on the same MAPS technology developed for ITS3
and will further push its detector requirements: the innermost vertex
detector layer, placed at 5 mm from the interaction point, must withstand
an integrated radiation load of 9x10^15 1 MeV neq/cm2 NIEL and 288 Mrad
TID; the outer tracker, extending from the beam pipe to a maximum radius
of about 80 cm, covers more than 50 m2 of area.
This contribution will cover both the ITS3 upgrade and the projects for
ALICE3 silicon tracker, highlighting their requirements, sensor
specifications, mechanics and integration. It will showcase the results
achieved during the ITS3 R&D and outline the challenges expected for the
implementation of the ALICE 3 tracking system.
| Collaboration | ALICE |
|---|---|
| Role of Submitter | I am the presenter |
