28,707 research outputs found

    Development of a GEM based TPC Readout for ILD

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    For the International Large Detector (ILD), foreseen to be built at the International Linear Collider (ILC), a Time Projection Chamber (TPC) is intended to be used as the main tracking detector. The amplification will be provided by Micro Pattern Gaseous Detectors (MPGDs). One option is the use of Gas Electron Multipliers (GEM) in combination with a segmented pad readout plane. The TPC group at DESY developed a modular system implementing a triple GEM stack mounted on thin ceramic grids. This material choice allows for high mechanical rigidity of the support structure at a reduced amount of material and dead area compared to commonly used GRP frames. This contribution gives an overview of the current status of this system. This includes a discussion of points we wanted to improve over the last generation of modules and what was implemented in the newest version. Also improvements in the production process of the modules, which ensure a consistent quality and present a step towards possible batch production.Comment: Talk presented at the International Workshop on Future Linear Colliders (LCWS2016), Morioka, Japan, 5-9 December 2016. C16-12-05.

    Low-x QCD at the LHC with the ALICE detector

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    We give a brief review of the physics of gluon saturation and non-linear QCD evolution at small values of the Bjorken-xx variable. We discuss the ALICE capability for low-xx studies at the LHC. In particular, we concentrate on the heavy quark production in the CGC framework and its observation with the ALICE Muon Spectrometer.Comment: 7 pages, 2 figures, Talk given at Excited QCD 2009, winter meeting on QCD, 8-14 February 09, Zakopane, Polan

    Quarkonia measurements with ALICE at the LHC

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    In this paper, we summarize the perspectives on quarkonia detection in the ALICE experiment at the CERN LHC, both in the dielectron and dimuon decay channels.Comment: 4 pages, 1 figure, Talk given at Quark Matter 2009: The 21st International Conference on UltraRelativistic Nucleus- Nucleus Collisions (QM 2009), March 30-April 4, Knoxville, TN, US

    Vortex sheet dynamics and turbulence

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    The nonlinear evolution of a vortex sheet driven by the Kelvin--Helmholtz instability is characterized by the formation of a spiral possessing complex stretching and intensity patterns. We show that the power energy spectrum of a single two-dimensional vortex sheet tends to the usual fluid turbulent spectrum, with an exponent of -3. Using numerical simulations and asymptotic methods, we demonstrate the relation between this power law and the singularities in the geometry and vorticity distribution of the sheet.Comment: Submitted to Phys. Rev. Letters, the Dynamique des vortex Collaboratio
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