Abstract
The ALICE (A Large Ion Collider Experiment) experiment at CERN will upgrade its Inner Tracking System (ITS) detector. The new ITS will consist of seven coaxial cylindrical layers of ALPIDE silicon sensors which are based on Monolithic Active Pixel Sensor (MAPS) technology. We have studied the radiation hardness of ALPIDE sensors using a 30 MeV proton beam provided by the cyclotron U-120M of the Nuclear Physics Institute of the Czech Academy of Sciences in Řež. In this paper, these long-term measurements will be described. After being irradiated up to the total ionization dose 2.7 Mrad and non-ionizing energy loss 2.7 × 10 13 1 MeV n eq · cm - 2 , ALPIDE sensors fulfill ITS upgrade project technical design requirements in terms of detection efficiency and fake-hit rate.
Highlights
IntroductionALICE (A Large Ion Collider Experiment) [1] is a high-energy physics detector at the CERN Large
ALICE (A Large Ion Collider Experiment) [1] is a high-energy physics detector at the CERN LargeHadron Collider (LHC)
In 2019–2020, the LargeHadron Collider (LHC) machine will be upgraded. This so-called second long shutdown will be followed by the Run 3 and Run 4 data-taking periods in which ALICE aims to perform detailed measurements of Quark–Gluon Plasma (QGP) properties using low transverse-momentum open-heavy-flavor hadrons, quarkonia, light vector mesons, and low-mass di-leptons [3]
Summary
ALICE (A Large Ion Collider Experiment) [1] is a high-energy physics detector at the CERN Large. It is designed to study strongly interacting matter in the regime of high-energy densities and temperatures which occur when ultra-relativistic heavy nuclei collide Under these conditions quarks and gluons escape their confinement in hadrons and form Quark–Gluon Plasma (QGP) [2]. In 2019–2020, the LHC machine will be upgraded This so-called second long shutdown will be followed by the Run 3 and Run 4 data-taking periods in which ALICE aims to perform detailed measurements of QGP properties using low transverse-momentum (pT ) open-heavy-flavor hadrons, quarkonia, light vector mesons, and low-mass di-leptons [3]. Since these channels have a very small signal-background ratio, large statistics with un-triggered running is needed. Another motivation for the ALICE upgrade is the expected increase of delivered luminosity by a factor of 100 in Run 3 and Run 4
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