102340714
CMS Tracker, ECAL and Pixel Optical Cabling: Installation and Performance Verification
The installation of 52304 optical links for the readout and control of the CMS Tracker, ECAL and Pixel detectors is complete. 768 96-way optical cables were installed and tested using an optical time-domain reflectometer. The testing was followed by connections at high density optical fibre patchpanels. Finally, a further round of testing and troubleshooting following feedback from system commissioning with the Tracker Data Acquisition was carried out. Over 90% of the faults found were recovered, resulting overall in only 0.1% of dead optical link channels in the CMS Tracker.
2971912
The CMS tracker Data Quality Monitoring expert GUI
Data Quality Monitoring (DQM) is mandatory in a high energy physics experiment like the Compact Muon Solenoid (CMS) at the CERN Large Hadron Collider (LHC). For the CMS Silicon Strip Tracker, the largest detector of this kind ever built, the DQM tasks translate into monitoring of 15148 silicon detector modules for a total of 9.3 million channels. An expert level Graphical User Interface has been developed to manage this highly granular information where the statistical characteristics of more than 350000 histograms are analyzed online during data-taking in order to raise warnings or alarms. In addition, specific quantities can be recalled on demand for problems investigation or online feedback on the data quality.
121356092
SIMULATION OF THE FINE MESH PHOTOMULTIPLERS IN THE TOF OF AMS-02
121019336
Nonleptonic weak interactions
121679562
Experimental proof of the inadequacy of the peaking approximation in radiative corrections
Abstract 49 e + e − non-collinear, non-coplanar events have been observed in a study of 1824 e + e − interactions at total centre-of-mass energies from 1.6 GeV to 2.0 GeV. The inadequacy of the peaking approximation in radiative corrections is measured to be (2.8 ± 0.4)%, in these experimental conditions of observation.
121176472
The time of flight detector of the AMS-02 experiment on the international space station
Abstract The Alpha Magnetic Spectrometer AMS-02 has been installed in May 19, 2011 on the International Space Station, where it will detect cosmic rays for the next decades. AMS-02 with its accurate measurements up to the TeV scale will contribute to our knowledge of the Universe providing the most sensitive search for the existence of primordial anti matter and indirect search for dark matter. The Time Of Flight (TOF) detector of the AMS-02 experiment provides the trigger to the AMS detector, the time of flight and the absolute charge measurements. The flight operations and the performances of the TOF in Space will be presented.