page_title: ALICE experiment
section_title: T0 detector
hierarchical_section_title: ALICE experiment / The ALICE detectors / Characterization of the collision / T0 detector
caption_attribution_description: English: An array of Cherenkov counters used in the ALICE T0 detector.
context_page_description: ALICE is one of eight detector experiments at the Large Hadron Collider at CERN. The other seven are: ATLAS, CMS, TOTEM, LHCb, LHCf, MoEDAL and FASER.
context_section_description: ALICE T0 serves as a start, trigger and luminosity detector for ALICE. The accurate interaction time (START) serves as the reference signal for the Time-of-Flight detector that is used for particle identification. T0 supplies five different trigger signals to the Central Trigger Processor. The most important of these is the T0 vertex providing prompt and accurate confirmation of the location of the primary interaction point along the beam axis within the set boundaries. The detector is also used for online luminosity monitoring providing fast feedback to the accelerator team.
  The T0 detector consists of two arrays of Cherenkov counters (T0-C and T0-A) positioned at the opposite sides of the interaction point (IP). Each array has 12 cylindrical counters equipped with a quartz radiator and a photomultiplier tube.
caption: An array of Cherenkov counters used in the ALICE T0 detector.
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