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    • Article
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    Commissioning of the alice-phos trigger

    Liu, Lijiao
    Journal of Physics: Conference Series, 2011, Vol.293(1), p.012062 (6pp) [Peer Reviewed Journal]
    IOPscience (IOP Publishing)
    Available
    More…
    Title: Commissioning of the alice-phos trigger
    Author: Liu, Lijiao
    Subject: Commissioning ; Diodes ; Photons ; On-Line Systems ; Collisions ; Cosmic Rays ; Luminosity ; Spectrometers ; Atomic and Molecular Physics (General) (So) ; Physics of Metals (MD) ; Physics (General) (Ah);
    Description: The Photon Spectrometer (PHOS) of the ALICE experiment at LHC is a high-resolution electromagnetic calorimeter dedicated to the precise measurement of direct photon and neutral meson yields in p+p and Pb+Pb collisions at mid-rapidity in a p T range up to 100 GeV/c. A multi-level trigger system selects events of interest and reduces the overall data flow. PHOS generates two triggers: i) the Level 0 (L0) trigger for high luminosity p+p runs acting mainly as a spectrometer trigger and for selecting high p T photons in Pb+Pb and in p+p collisions; ii) the Level1 (L1) trigger corresponds to a more sophisticated shower analysis which refines the p T selection. The algorithms perform a pulse-shape analysis of the oversampled Avalanche Photo Diode (APD) signal followed by a sliding-window cluster finder. Both triggers are implemented in the firmware which, since SRAM-based FPGAs are used, can be changed on-line between runs. The trigger system was commissioned by cosmic rays and particles from interactions. The status of the trigger system and first results will be presented.
    Is part of: Journal of Physics: Conference Series, 2011, Vol.293(1), p.012062 (6pp)
    Identifier: 1742-6588 (ISSN); 1742-6596 (E-ISSN); 10.1088/1742-6596/293/1/012062 (DOI)

    • Several versions

    Pion, Kaon, and Proton Production in Central Pb--Pb Collisions at $\sqrt{s_{NN}}$ = 2.76 TeV

    Alme, Johan, Erdal, Hege Austrheim, Helstrup, Håvard, Hetland, Kristin Fanebust, Kileng, Bjarte, Altinpinar, Sedat, Djuvsland, Øystein, Fehlker, Dominik, Haaland, Øystein Senneset, Huang, Meidana, Langøy, Rune, Lien, Jørgen, Liu, Lijiao, Nystrand, Joakim, Røed, Ketil
    Physical review letters, 2012 [Peer Reviewed Journal]

    • Several versions

    Particle-yield modification in jet-like azimuthal dihadron correlations in Pb-Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV

    Aamodt, Kenneth, Altinpinar, Sedat, Djuvsland, Øystein, Fehlker, Dominik, Haaland, Øystein Senneset, Huang, Meidana, Kanaki, Kalliopi, Larsen, Dag Toppe, Lien, Jørgen, Liu, Lijiao, Lønne, Per-Ivar, Nystrand, Joakim, Øvrebekk, Gaute, Richter, Matthias, Røhrich, Dieter
    Physical review letters, 2012 [Peer Reviewed Journal]

    • Several versions

    Charge separation relative to the reaction plane in Pb-Pb collisions at $\sqrt{s_{NN}}$= 2.76 TeV

    Alme, Johan, Erdal, Hege Austrheim, Helstrup, Håvard, Hetland, Kristin Fanebust, Kileng, Bjarte, Altinpinar, Sedat, Djuvsland, Øystein, Fehlker, Dominik, Haaland, Øystein Senneset, Huang, Meidana, Langøy, Rune, Lien, Jørgen, Liu, Lijiao, Nystrand, Joakim, Røed, Ketil
    Physical review letters, 2013 [Peer Reviewed Journal]

    • Several versions

    Measurement of the Cross Section for Electromagnetic Dissociation with Neutron Emission in Pb-Pb Collisions at √sNN = 2.76 TeV

    Alme, Johan, Erdal, Hege Austrheim, Helstrup, Håvard, Hetland, Kristin Fanebust, Kileng, Bjarte, Altinpinar, Sedat, Djuvsland, Øystein, Fehlker, Dominik, Haaland, Øystein Senneset, Huang, Meidana, Kanaki, Kalliopi, Langøy, Rune, Larsen, Dag Toppe, Lien, Jørgen, Liu, Lijiao
    Physical review letters, 2012 [Peer Reviewed Journal]

    • Several versions

    Production of muons from heavy flavour decays at forward rapidity in pp and Pb-Pb collisions at $\sqrt {s_{NN}}$ = 2.76 TeV

    Alme, Johan, Erdal, Hege Austrheim, Helstrup, Håvard, Hetland, Kristin Fanebust, Kileng, Bjarte, Altinpinar, Sedat, Djuvsland, Øystein, Fehlker, Dominik, Haaland, Øystein Senneset, Huang, Meidana, Kanaki, Kalliopi, Langøy, Rune, Lien, Jørgen, Liu, Lijiao, Lønne, Per-Ivar
    Physical review letters, 2012 [Peer Reviewed Journal]

    • Several versions

    J/$\psi$ suppression at forward rapidity in Pb-Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV

    Alme, Johan, Erdal, Hege Austrheim, Helstrup, Håvard, Hetland, Kristin Fanebust, Kileng, Bjarte, Altinpinar, Sedat, Djuvsland, Øystein, Fehlker, Dominik, Haaland, Øystein Senneset, Huang, Meidana, Kanaki, Kalliopi, Langøy, Rune, Lien, Jørgen, Liu, Lijiao, Lønne, Per-Ivar
    Physical review letters, 2012 [Peer Reviewed Journal]

    • Dissertation
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    L0/L1 trigger generation by the ALICE PHOS detector

    Liu, Lijiao
    Norwegian Open Research Archives (NORA)
    Available
    More…
    Title: L0/L1 trigger generation by the ALICE PHOS detector
    Author: Liu, Lijiao
    Publisher: The University of Bergen
    Date: 2011
    Description: Quark-Gluon Plasma (QGP) is a phase that exists above a critical temperature and corresponding energy density according to the theory of Quantum Chromo-Dynamics (QCD). The studies of the QGP help us to understand the early evolution of our universe and the Standard Model. A large Ion Collider Experiment (ALICE) aims to study the properties of the QGP. A QGP can not be observed directly because it is a short lived state. Signatures such as jet quenching, flow pattern and high pT suppression indicate the existence of a QGP. Various sub-detectors are designed for detecting these signatures. The PHOton Spectrometer (PHOS), one of the sub-detectors, is a high-resolution electromagnetic calorimeter dedicated to the precise measurement of direct photon and neutral meson yields in a pT range up to 100 GeV/c. Four online systems are developed to monitor, control and read out the different subdetectors. The trigger system is one of them. The task of the trigger system is to select events...
    Identifier: 9788230819180 (ISBN); 8230819181 (ISBN)

    • Dissertation
    Select

    L0/L1 trigger generation by the ALICE PHOS detector

    Liu, Lijiao
    University of Bergen
    Available
    More…
    Title: L0/L1 trigger generation by the ALICE PHOS detector
    Author: Liu, Lijiao
    Publisher: The University of Bergen
    Date: 2011-12-14
    Subject: Vdp::Mathematics And Natural Science: 400::Physics: 430::Nuclear And Elementary Particle Physics: 431
    Description: Quark-Gluon Plasma (QGP) is a phase that exists above a critical temperature and corresponding energy density according to the theory of Quantum Chromo-Dynamics (QCD). The studies of the QGP help us to understand the early evolution of our universe and the Standard Model. A large Ion Collider Experiment (ALICE) aims to study the properties of the QGP. A QGP can not be observed directly because it is a short lived state. Signatures such as jet quenching, flow pattern and high pT suppression indicate the existence of a QGP. Various sub-detectors are designed for detecting these signatures. The PHOton Spectrometer (PHOS), one of the sub-detectors, is a high-resolution electromagnetic calorimeter dedicated to the precise measurement of direct photon and neutral meson yields in a pT range up to 100 GeV/c. Four online systems are developed to monitor, control and read out the different subdetectors. The trigger system is one of them. The task of the trigger system is to select events...
    Identifier: 978-82-308-1918-0 (ISBN)

    • Several versions

    Soybean (Glycine max) prevents the progression of breast cancer cells by downregulating the level of histone demethylase JMJD5

    Wang, Yan, Liu, Lijiao, Ji, Fujian, Jiang, Junnan, Yu, Yang, Sheng, Shihou, Li, Haibin
    Journal of Cancer Research and Therapeutics, 2018, Vol.14(10), p.609-615 [Peer Reviewed Journal]