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Abstract <p>The Fast Interaction Trigger (FIT)—a hybrid system of three ALICE forward detectors—has participated in each data-taking session since the beginning of LHC Run 3 in July 2022. FIT is essential for ALICE operation and provides the fastest online trigger, measures precision collision time, charged-particle multiplicity and centrality, and determines the online vertex position. It also serves as the primary online luminometer used by the LHC for beam levelling at ALICE.</p>

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Status of the ALICE Fast Interaction Trigger in RUN 3

  • 期刊论文

  • 发表日期：

    2025年4月1日

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  • M. Sukhanov,
  • A. Furs,
  • D. Finogeev,
  • T. Karavicheva,
  • D. Serebryakov,
  • N. Vozniuk

摘要

Abstract

The Fast Interaction Trigger (FIT)—a hybrid system of three ALICE forward detectors—has participated in each data-taking session since the beginning of LHC Run 3 in July 2022. FIT is essential for ALICE operation and provides the fastest online trigger, measures precision collision time, charged-particle multiplicity and centrality, and determines the online vertex position. It also serves as the primary online luminometer used by the LHC for beam levelling at ALICE.