CERN Accelerating science

Article
Report number	arXiv:2005.01443
Title	Commissioning of the new ALICE Inner Tracking System
Author(s)	Iddon, James Philip (Liverpool U. ; CERN)
Collaboration	ALICE ITS Collaboration
Publication	2020-08-07
Imprint	2020-05-04
Number of pages	9
In:	JINST 15 (2020) C08009
In:	Instrumentation for Colliding Beam Physics, Novosibirsk, Russia, 24 - 28 Feb 2020, pp.C08009
DOI	10.1088/1748-0221/15/08/C08009
Subject category	hep-ex ; Particle Physics - Experiment ; physics.ins-det ; Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ALICE
Abstract	The upgrade of the Inner Tracking System (ITS) of ALICE (A Large Ion Collider Experiment) will extend measurements of heavy-flavour hadrons and low-mass dileptons to a lower transverse momentum than currently achieved and increase the readout capabilities to incorporate the full interaction. Furthermore, the tracking efficiency will be improved at low transverse momentum. To achieve this, the new ALICE ITS is comprised of seven layers of a custom Monolithic Active Pixel Sensor design known as ALPIDE, with a spatial resolution of $5\,\mathrm{\mu m}$. The use of the ALPIDE-based detector design will reduce the material budget to $0.35\%\,\mathrm{X_0}$ per layer for the innermost three layers, and to $1.0\%\,\mathrm{X_0}$ per layer for the outermost four layers, compared to $1.14\%\,\mathrm{X_0}$ per layer in the previous ITS. The construction effort in numerous sites around the world has resulted in a fully assembled and connected detector, which is currently undergoing on surface commissioning before its installation in the ALICE cavern. This contribution discusses the design and the current status of the commissioning of the new ITS detector, including the methods used to characterise the detector and the results obtained so far.
Copyright/License	preprint: (License: arXiv nonexclusive-distrib 1.0) publication: © 2020-2025 IOP Publishing Ltd and Sissa Medialab

Corresponding record in: Inspire