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SUMMARY:Performance and upgrade plans of the ALICE Photon Spectrometer
DTSTART;VALUE=DATE-TIME:20201007T090000Z
DTEND;VALUE=DATE-TIME:20201007T092000Z
DTSTAMP;VALUE=DATE-TIME:20260515T143005Z
UID:indico-contribution-2415@cern.ch
DESCRIPTION:Speakers: Dmitry Blau (NRC "Kurchatov Institute")\nPHOS is a h
 ighly granulated precision spectrometer\, one of the two\nelectromagnetic 
 calorimeters of ALICE (A Large Ion Collider Experiment)\nat the LHC. It is
  based on scintillating PbWO4 crystals and is\ndedicated to the precise me
 asurements of spectra\, collective flow and\ncorrelations of thermal and p
 rompt direct photons\, and of neutral mesons\nin ultra-relativistic nuclea
 r collisions at LHC energies. PHOS\nparticipated in LHC Run 1 (2009-2013) 
 and Run 2 (2015-2018)\, during which a large\namount of physical data were
  collected in pp\, p-Pb and Pb-Pb collisions.\n\nThe choice of active mate
 rial with small Molière radius allows PHOS to\noperate in a high-multipli
 city environment and to reconstruct neutral pions\nby two-photon decays up
  to very high transverse momenta ~60 GeV/c. In\norder to increase the ligh
 t yield of the crystals and reduce electronic noise\,\nPHOS is cooled down
  and kept at a constant temperature of -25^{\\circ} C. This resulted in\ne
 xcellent energy and position resolutions. Dedicated L0 and L1\ntriggers we
 re used to increase collected integrated luminosity during\ndata taking.\n
 \nWe will present an overview of the PHOS performance during Runs 1 and 2 
 and plans for\nan upgrade for LHC Run 4 (currently expected for 2025-2027)
  and beyond. PHOS\nupgrade is ongoing and covers the following three aspec
 ts: front-end cards (FEC)\nusing modern components to improve timing resol
 ution and operation\nreliability\; photodetectors to increase sensitivity 
 to\nlow-energy photons and to improve timing resolution\; mechanical struc
 ture of \nmodules to ease access to FEC and improve\noperation reliability
 . The physics program of the upgraded PHOS will also be\ndiscussed.\n\nhtt
 ps://indico.particle.mephi.ru/event/35/contributions/2415/
LOCATION:Zoom Facilities
URL:https://indico.particle.mephi.ru/event/35/contributions/2415/
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