Abstract
PHOS is a highly granulated precision spectrometer, one of the two electromagnetic calorimeters of ALICE (A Large Ion Collider Experiment) at the LHC. It is based on scintillating PbWO4 crystals and is dedicated to the precise measurements of spectra, correlations and collective flow of neutral mesons, thermal and prompt direct photons in ultra-relativistic nuclear collisions at LHC energies. PHOS participated in LHC Run 1 (2009–2013) and Run 2 (2015–2018), during which a large amount of physical data were collected in pp, p-Pb and Pb-Pb collisions.We present an overview of the PHOS performance during Runs 1 and 2 and plans for an upgrade for future LHC runs.
Highlights
ALICE (A Large Ion Collider Experiment) at the LHC is designed for studies of nuclear matter at extreme temperatures and energy densities, the so-called Quark-Gluon Plasma (QGP) [1]
We present an overview of the PHOS performance during Runs 1 and 2 and plans for an upgrade for future LHC runs
PHOS is an electromagnetic calorimeter based on scintillating PbWO4 crystals dedicated for precise measurements of spectra, correlations and collective flow of neutral mesons and direct photons in ultra-relativistic nuclear collisions at LHC energies
Summary
ALICE (A Large Ion Collider Experiment) at the LHC is designed for studies of nuclear matter at extreme temperatures and energy densities, the so-called Quark-Gluon Plasma (QGP) [1]. PHOS is an electromagnetic calorimeter based on scintillating PbWO4 crystals dedicated for precise measurements of spectra, correlations and collective flow of neutral mesons and direct photons in ultra-relativistic nuclear collisions at LHC energies. PHOS is operated at a constant temperature of −25◦ C in order to increase light yield of crystals and further improve the energy resolution.
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