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ALICE is the dedicated heavy-ion experiment at the CERN Large Hadron Collider (LHC). Its main tracking and particle-identification detector is a large volume Time Projection Chamber (TPC). The TPC has been designed to perform well in the…

Instrumentation and Detectors · Physics 2022-03-22 Mesut Arslandok , Ernst Hellbär , Marian Ivanov , Robert Helmut Münzer , Jens Wiechula

During the second LHC long shutdown (LS2) the Inner Tracking System (ITS) of ALICE (A Large Ion Collider Experiment) will be replaced by seven layers of CMOS Monolithic Active Pixel Sensors (MAPS). The latest innovations in silicon imaging…

Nuclear Experiment · Physics 2020-05-01 D. Andreou

The ALICE experiment at the CERN Large Hadron Collider (LHC) is a multi-purpose particle detector, mainly focused on the study of quark-gluon plasma (QGP) in heavy-ion collisions. In the forward rapidity region, 2.5 $<$ y $<$ 4, ALICE is…

Nuclear Experiment · Physics 2024-11-04 Luca Quaglia , ALICE collaboration

The ALICE Experiment at the Large Hadron Collider (LHC) underwent a major upgrade during the Long Shutdown 2. Several subsystems have been improved, including the ALICE Inner Tracking System (ITS), which has been entirely replaced. The new…

Instrumentation and Detectors · Physics 2024-10-01 Andrea Sofia Triolo

The ALICE experiment at CERN is preparing for a major upgrade for the third phase of data taking run (Run 3), when the high luminosity phase of the Large Hadron Collider (LHC) starts. The increase in the beam luminosity will result in high…

Instrumentation and Detectors · Physics 2019-02-20 Jubin Mitra , Erno David , Eduardo Mendez , Shuaib Ahmad Khan , Tivadar Kiss , Sophie Baron , Alex Kluge , Tapan Nayak

For Run 4, ALICE is pioneering the construction of truly cylindrical tracking layers, which will improve the measurements of heavy-flavour hadrons and dielectrons. In addition, a Forward Calorimeter (FoCal) for the measurement of direct…

Nuclear Experiment · Physics 2022-11-10 H. Sebastian Scheid

In the future ALICE heavy ion experiment at CERN's Large Hadron Collider input data rates of up to 25 GB/s have to be handled by the High Level Trigger (HLT) system, which has to scale them down to at most 1.25 GB/s before being written to…

Distributed, Parallel, and Cluster Computing · Computer Science 2010-11-19 Timm M. Steinbeck , Volker Lindenstruth , Heinz Tilsner

ALICE (A Large Ion Collider Experiment) at the CERN Large Hadron Collider (LHC) is designed to study proton-proton and heavy-ion collisions at ultra-relativistic energies. The main goal of the experiment is to assess the properties of quark…

Instrumentation and Detectors · Physics 2022-10-25 Livia Terlizzi

In the upcoming LHC Run 3, starting in 2021, the upgraded Time Projection Chamber (TPC) of the ALICE experiment will record minimum bias Pb-Pb collisions in a continuous readout mode at an interaction rate up to 50 kHz. This corresponds to…

Instrumentation and Detectors · Physics 2021-02-03 Marten Ole Schmidt

A selection of recent ALICE results from pp, p--Pb, Pb--Pb and Xe--Xe collisions taken during the Run 1 and Run 2 phases are summarized in this contribution, and the prospects for the upcoming Run 3 phase are outlined.

Nuclear Experiment · Physics 2019-10-07 Robert Vertesi

ALICE (A Large Ion Collider Experiment) is the heavy-ion detector designed to study the strongly interacting state of matter realized in relativistic heavy-ion collisions at the CERN Large Hadron Collider (LHC). A major upgrade of the…

Instrumentation and Detectors · Physics 2019-08-14 Pascal Boeschoten , Filippo Costa

The LHC with its unprecedented energy offers unique opportunities for groundbreaking measurements in p+p, p+A and A+A collisions even beyond the baseline experimental designs. ALICE is setting up a program of detector upgrades, which could…

Instrumentation and Detectors · Physics 2019-08-13 Thomas Peitzmann

Many observables which are used as a signature of the collective effects in heavy-ion collisions when measured in high multiplicity pp and pA interactions reveal a very similar behaviour. We will present first measurements of different…

Nuclear Experiment · Physics 2019-02-07 Katarína Gajdošová

The ALICE detector is undergoing an upgrade for Run 3 at the LHC. A new Inner Tracking System (ITS) is part of this upgrade. The upgraded ALICE ITS features the ALPIDE, a Monolithic Active Pixel Sensor. Due to IC fabrication variations and…

Instrumentation and Detectors · Physics 2022-05-11 Shiming Yuan , Johan Alme , Markus Keil , Ivan Ravasenga , Matthias Richter , Dieter Röhrich

ALICE, the experiment dedicated to the study of heavy ion collisions at the LHC, uses an object-oriented framework for simulation, reconstruction and analysis (AliRoot) based on ROOT. Here, we describe the general ALICE simulation strategy…

Computational Physics · Physics 2007-05-23 F. Carminati , A. Morsch

As from the run 3 of CERN LHC scheduled in 2022, the upgraded ALICE experiment will use a Common Readout Unit (CRU) at the heart of the data acquisition system. The CRU, based on the PCIe40 hardware designed for LHCb, is a common interface…

Instrumentation and Detectors · Physics 2021-06-23 O. Bourrion , J. Bouvier , F. Costa , E. David , J. Imrek , T. M. Nguyen , S. Mukherjee

The High Level Trigger (HLT) system of the ALICE experiment is an online event filter and trigger system designed for input bandwidths of up to 25 GB/s at event rates of up to 1 kHz. The system is designed as a scalable PC cluster,…

ALICE Overwatch is a project started in late 2015 to provide augmented online monitoring and data quality assurance utilizing time-stamped QA histograms produced by the ALICE High Level Trigger. The system receives the data via ZeroMQ,…

Instrumentation and Detectors · Physics 2019-10-02 R. J. Ehlers , J. D. Mulligan

The Inner Tracking System (ITS) of the ALICE experiment at the CERN Large Hadron Collider (LHC) is the largest Monolithic Active Pixel Sensor technology application in high-energy physics. The upgraded version of the tracking system, called…

Instrumentation and Detectors · Physics 2025-06-05 Svetlana Kushpil

A Large Ion Collider Experiment (ALICE) is one of the four major experiments conducted at the CERN Large Hadron Collider (LHC). The ALICE detector is currently undergoing an upgrade for the upcoming Run 3 at the LHC. The new Inner Tracking…