123498730
CMS tracker performance
Abstract The Compact Muon Solenoid (CMS) experiment is a multipurpose high energy physics detector operated at the CERN Large Hadron Collider (LHC) near Geneva, Switzerland. The current status and performance of the CMS silicon tracker after 2 years of p–p collisions at s = 7 TeV are reviewed.
110850685
First level trigger using pixel detector for the CMS experiment
A proposal for a pixel-based Level 1 trigger for the Super-LHC is presented. The trigger is based on fast track reconstruction using the full pixel granularity exploiting a readout which connects different layers in specific trigger towers. The trigger will implement the current CMS high level trigger functionality in a novel concept of intelligent detector. A possible layout is discussed and implications on data links are evaluated.
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.
119968739
CMS Silicon Strip Tracker Commissioning and Preliminary Performances
The Silicon Strip Tracker (SST) of the Compact Muon Solenoid (CMS) Experiment at the CERN Large Hadron Collider (LHC) is the world's largest silicon microstrip detector. The SST is composed of four subdetectors which were integrated into the Tracker Support Tube (TST) at the CERN Tracker Integration Facility (TIF) in March 2007. After the insertion of the TST into CMS in December 2007, the first data taking of CMS with the SST included took place in July 2008 without magnetic field and one month later with a magnetic field of 3.8 Tesla. The SST was ready for the LHC start-up of September 10, 2008. The main aspects of the SST commissioning and a description of the problems encountered and solved so far are summarized here together with some preliminary performance evaluation.
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.
109989158
The ZEUS vertex and forward muon detectors readout electronics
Abstract The readout electronics for the Vertex and Forward Muon detectors of the ZEUS experiment at HERA is presented. The system architecture, based on a multilevel modular hierarchical structure, and the system performance are outlined.
124699481
A study of the hadronic angular distribution in (e+e-) processes from 1.2 to 3.0 GeV
SummaryThe angular distribution of 2720 tracks of 1085 hadronic final states produced from (e+e-) annihilation has been studied in the 1.2 to 3.0 GeV total centre-of-mass energy range. If we parametrize the angular distribution in terms off(θ) =1 + A cos2 θ, where 6 is the angle between the hadronic track produced and the colliding-beam direction, the results show thatA is less than 0.21, with 90% confidence.RiassuntoÈ stata analizzata la distribuzione angolare di 2720 tracce appartenenti a 1085 eventi adronici prodotti nell’annichilazione (e+e-) nell’intervallo di energia totale nel centro di massa da 1.2 a 3.0 GeV. Parametrizzando la distribuzione angolare con una funzione del tipof(θ) = 1 +A cos2 θ, in cui θ è l’angolo f ra la traccia adronica prodotta e la direzione dei fasci, i risultati mostrano cheA è inferiore a 0.21 con un livello di confidenza del 90%.
123396645
Calibration and performance of the AMS-02 time of flight detector in space
AMS-02 is a high energy particle detector deployed in May 19, 2011 on board of the International Space Station (ISS) where it is expected to be in operation for the ISS lifetime of at least a decade. The main goal of AMS-02 is the detection of cosmic rays and gammas from the GeV to the TeV energy region to search for anti-matter, dark matter and understanding the origin of the cosmic rays. The AMS-02 time of flight (TOF) detector provides the trigger to experiment and allows precise measurements of the cosmic rays velocity and charge magnitude from hydrogen to iron and above. With the data set acquired during the first two and a half years of operation in space, a precise time-dependent calibration for time, velocity and charge measured by the TOF had been developed. The TOF calibration methods are described and the AMS-02 TOF performance in space is presented. (C) 2014 Elsevier B.V. All rights reserved.
209911742
Proof of hadron production in (e+e−) interactions.
121525517
Experimental proof that the leading protons are not correlated
SummaryThe correlations between the two «leading» protons in thex-range 0.4⩽x<0.9 are measured to be below ±1%, at the highest ISR energy.RiassuntoNelle interazioni protone-protone alla piú alta energia degli ISR, la correlazione inx tra i due protoni «leading» misurata nell’intervallo 0.4⩽x⩽0.9 è stata trovata inferiore a ±1%.