2,140 research outputs found

    The First Year at LHC: Diffractive Physics

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    At the LHC, diffractive physics will be explored by the dedicated experiment TOTEM whose Technical Design Report has been approved in Summer 2004. The experimental programme will be carried out partly in TOTEM standalone mode for purely forward phenomena like elastic scattering, and partly in collaboration with CMS for processes requiring a full rapidity coverage. ATLAS and ALICE are interested in diffraction for a later stage. This article presents the TOTEM/CMS running scenario for diffractive physics in the first year of LHC. We discuss which processes are within reach and with which statistics they can be measured.Comment: 11 pages, 7 figures; proceedings of "Physics at LHC", July 2004, Vienna; to be published in a supplement of the Czechoslovak Journal of Physic

    Optimierung der Operationsparameter von Hochdruckdriftrohren fuer ATLAS

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    TOTEM: Prospects for Total Cross-Section and Luminosity Measurements

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    With the installation of the T1 telescope and the Roman Pot stations at 147 m from IP5, the detector apparatus of the TOTEM experiment has been completed during the technical stop in winter 2010/2011. After the commissioning of the dedicated beam optics with beta* = 90 m, a first measurement of the total pp cross-section sigma_tot and -- simultaneously -- the luminosity L will be possible in the upcoming running season 2011. The precision envisaged is 3 % and 4 % for sigma_tot and L, respectively. An ultimate beam optics configuration with beta* ~ 1 km will later reduce the uncertainty to the 1 % level.Comment: 4 pages, 4 figures; presented at the LHC Lumi Days: LHC Workshop on LHC Luminosity Calibration, 13-14 January 2011, CERN, Geneva, Switzerland, pp. 7-1

    Estimation and analysis of the machine-induced background at the TOTEM roman pot detectors in the IR5 of the LHC

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    The problem of background generation in the experimental insertion IR5 of the LHC during machine operation in the dedicated TOTEM mode with low intensity beams and the specially designed β* = 1540 m optics is discussed. The sources of the machine-induced background in the IR5 forward physics areas are identified and their relative importance is evaluated. The results of the background simulation in the IR5 are presented, based on the most recent estimates of the residual gas density for TOTEM beam conditions. The methods for background analysis and rejection are explained

    Construction and Test of MDT Chambers for the ATLAS Muon Spectrometer

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    The Monitored Drift Tube (MDT) chambers for the muon spectrometer of the AT- LAS detector at the Large Hadron Collider (LHC) consist of 3-4 layers of pressurized drift tubes on either side of a space frame carrying an optical monitoring system to correct for deformations. The full-scale prototype of a large MDT chamber has been constructed with methods suitable for large-scale production. X-ray measurements at CERN showed a positioning accuracy of the sense wires in the chamber of better than the required 20 ?microns (rms). The performance of the chamber was studied in a muon beam at CERN. Chamber production for ATLAS now has started
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