The ALICE experiment is designed to study strongly interacting nuclear matter which will be produced in heavy ion collisions at the Large Hadron Collider (LHC). The muon spectrometer of the ALICE ...experiment is equipped with a trigger system based on resistive plate chambers. A commissioning phase was started in 2008 with the detection of cosmic rays and induced particles of the first beam injections into the LHC ring. The performances of the whole muon trigger system achieved during the commissioning phase are presented.
This article documents the characteristics of the high voltage (HV) system of the hadronic calorimeter TileCal of the ATLAS experiment. Such a system is suitable to supply reliable power distribution ...into particles physics detectors using a large number of PhotoMultiplier Tubes (PMTs). Measurements performed during the 2015 and 2016 data taking periods of the ATLAS detector show that its performance, in terms of stability and noise, fits the specifications. In particular, almost all the PMTs show a voltage instability smaller than 0.5 V corresponding to a gain stability better than 0.5%. A small amount of channels was found not working correctly. To diagnose the origin of such defects, the results of the HV measurements were compared to those obtained using a Laser system. The analysis shows that less than 0.2% of the about 10 thousand HV channels were malfunctioning.
Ageing tests on the low-resistivity RPC for the ALICE dimuon arm Arnaldi, R.; Baldit, A.; Barret, V. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
08/2003, Letnik:
508, Številka:
1-2
Journal Article
Type Ia Supernovae have yet again the opportunity to revolutionize the field of cosmology as the new generation of surveys are acquiring thousands of nearby SNeIa opening a new era in cosmology: the ...direct measurement of the growth of structure parametrized by \(fD\). This method is based on the SNeIa peculiar velocities derived from the residual to the Hubble law as direct tracers of the full gravitational potential caused by large scale structure. With this technique, we could probe not only the properties of dark energy, but also the laws of gravity. In this paper we present the analytical framework and forecasts. We show that ZTF and LSST will be able to reach 5\% precision on \(fD\) by 2027. Our analysis is not significantly sensitive to photo-typing, but known selection functions and spectroscopic redshifts are mandatory. We finally introduce an idea of a dedicated spectrograph that would get all the required information in addition to boost the efficiency to each SNeIa so that we could reach the 5\% precision within the first two years of LSST operation and the few percent level by the end of the survey.
The trigger for the ALICE muon spectrometer will be issued by single-gap, low-resistivity bakelite RPCs. The trigger detector will be made of four
6
×
6
m
2
RPC planes arranged in two stations, for ...a total of 72 chambers. Strip planes, stiffener planes and mechanical supports are realized and assembled in the INFN Technological Laboratory in Torino (Italy).
All the produced volumes are tested before installation in ALICE: gas tightness and spacer gluing are checked at INFN-LNGS, while INFN-Torino Laboratory houses the cosmic rays test station. The tests are made with the ALICE streamer mixture (50.5% Ar, 41.3% C
2H
2F
4, 7.2% i-C
4H
10, 1% SF
6) and include measure of the electrodes resistivity, together with noise and efficiency mapping. These tests provide a complete characterization of the detectors (efficiency, cluster size, absorbed current, noise rates).
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