1,721,190 research outputs found
L’affidabilità negli esperimenti di fisica delle particelle. Parte II: il controllo e la diagnostica
No full textGli esperimenti di fisica delle particelle elementari possono a ragione essere ritenuti dei veri e propri strumenti di misura. Grazie a questi strumenti è possibile misurare le proprietà delle particelle elementari (come, per esempio, la loro massa e vita media) e le interazioni che intercorrono fra esse. Il Large Hadron Collider (LHC) – il più potente collisore protone-protone mai costruito – è operativo al CERN dal 2009 ed ha raggiunto un’energia record nel centro di massa di 13 TeV [1]. I due esperimenti ATLAS e CMS [2-3], installati lungo l’anello del collisore, sono due grossi rivelatori costruiti per studiare le particelle prodotte nelle collisioni all’LHC. I due esperimenti hanno annunciato nel 2012 di aver confermato sperimentalmente l’esistenza del Bosone di Higgs [4-5]. In questa memoria si cercherà di illustrare le problematiche inerenti il controllo e il monitoraggio dei sistemi vitali che è possibile incontrare in questo ambito sceintifico.Elementary particle physics experiments can be thought as complex measuring instruments. Thanks to them we can measure the properties of elementary particles (as for example, their mass or lifetime) and of their interactions. The Large Hadron Collider (LHC), the most powerful proton-proton collider every built, is successfully operating at CERN since 2009 and has reached a record center-of-mass energy of 13 TeV [1]. ATLAS and CMS [2-3] are two multi-purpose experiments built to exploit the LHC collisions. These are the two biggest experiments of this kind ever built and are the two experiments that in 2012 announced the discovery of the Higgs boson [4-5]. Aspects regarding the monitoring system used in the ATLAS experiment will be here summarized
L’affidabilità negli esperimenti di fisica delle particelle. Parte I: la struttura e l’affidabilità
No full textGli esperimenti di fisica delle particelle elementari possono a ragione essere ritenuti dei veri e propri strumenti di misura. Grazie a questi strumenti è possibile misurare le proprietà delle particelle elementari (come, per esempio, la loro massa e vita media) e le interazioni che intercorrono fra esse. Il Large Hadron Collider (LHC) – il più potente collisore protone-protone mai costruito – è operativo al CERN dal 2009 ed ha raggiunto un’energia record nel centro di massa di 13 TeV [1]. I due esperimenti ATLAS e CMS [2-3], installati lungo l’anello del collisore, sono due grossi rivelatori costruiti per studiare le particelle prodotte nelle collisioni all’LHC. I due esperimenti hanno annunciato nel 2012 di aver confermato sperimentalmente l’esistenza del Bosone di Higgs [4-5]. In questa memoria si cercherà di illustrare le problematiche inerenti l’affidabilità che si possono incontrare in questo ambito scientifico.Elementary particle physics experiments can be thought as complex measuring instruments. Thanks to them we can measure the properties of elementary particles (as for example, their mass or lifetime) and of their interactions. The Large Hadron Collider (LHC), the most powerful proton-proton collider every built, is successfully operating at CERN since 2009 and has reached a record center-of-mass energy of 13 TeV [1]. ATLAS and CMS [2-3] are two multi-purpose experiments built to exploit the LHC collisions. These are the two biggest experiments of this kind ever built and are the two experiments that in 2012 announced the discovery of the Higgs boson [4-5]. Aspects regarding reliability issues in the ATLAS experiment will be here summarized
Power Distribution Section for LTDB: tests on PDB and news on PDB-LTM
No full textThe research activity for the design of the power distribution
section of the ATLAS LAr Trigger Digitizer Board board (LTDB)
will be presented. Many aspects concerning the radiation
hardness and the ability to operate Point-of-load converters
even in presence of high magnetic fields will be covered.
Devices designed by CERN have been used and their
capability for implementation on the ATLAS LTDB has been
exploited with the aim to have a power distribution section with
the required performances
PDB issues and Production Plan
Full text link8 PDB pre‐production boards (version 3) received in Milano end of February Differences between version 3 and previous version (version 2): 1. Different values of some resistors in order to optimize a few output voltages as requested by Hao after some tests of PDB v2 in the LTDB 2. Some geometrical changes implemented in the frame Of the 8 pre‐production PDBS: • 4 boards were not useable because of a mistake made by the manufacturer (problem understood – see March Lar week presentation https://indico.cern.ch/event/800559/contributions/3339352/attachments/1806520/2948521/PDB‐LTM_2019‐03‐05.pdf ) • 4 boards were successfully tested in Milano and 3 of them were sent to BNL During the tests in BNL, a start up sequence not correct in some situation was observed. The problem could not be reproduced in Milano with the other v3 board. Moreover the problem was not observed with v2 boards (neither in Milano nor in BNL) Investigation on this issue started and the problem was traced to dependencies on the LVPS used in the tests. Milano had used always the same LVPS in the tests, BNL used not only the Wiener LVPS but also other devices (Vicor and Keysight). Moreover the input capacitors of the LTDB were changed to be compatible with 48 V input voltage for Phase II: – to be compatible with the footprint in the LTDB layout the capacitance was slightly reduced
Scheda ATLAS - LAr PDB-LTM Rev. 5
No full textScheda per l'alimentazione della scheda LTDB del Calorimetro LAr di esperimento ATLAS al CERN
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