An extension of the study of two particle correlations used at RHIC to LHC energies (Pb + Pb at
= 5.5 TeV) is presented. The method is based on the two-dimensional Fourier Transform used to calculate ...the angular autocorrelation function in (
η,ϕ
) space. It does not require the identification of a leading particle and is, hence, optimized to the low-pt and medium-pt region at LHC where many minijets are overlapping. We discuss the feasibility of the analysis in heavy ion collisions at the LHC using HIJING and Pythia simulations.
The imaging silicon pixel array (ISPA) tube is an opto-electronic camera with single photon detection capability at room temperature and ~1 MHz detection rates. To further improve the ISPA spatial ...resolution, its radiation entrance window is made of scintillating YAlO(3)(Ce), which serves at the same time as its gamma detector. The photocathode is coated at its vacuum surface and the escaping photoelectrons are guided by a parallel electric field (proximity focusing) toward a pixelized silicon anode. With this new window configuration, we achieved 0.25 mm ISPA spatial resolution with 0.35 mm collimator holes. This agrees with 0.22 mm expected spatial resolution, deduced from the evaluated hit-number of photoelectrons on the anode pixels and the photoelectron cluster residuals.
The ENUBET experiment is developing a new narrow-band neutrino beam in which the flux and the flavor composition are known at 1
level, and the energy with O(10
) precision. Such a goal is ...accomplished monitoring the associated charged leptons produced in the decay region of the ENUBET facility:
and
from kaons are measured by a segmented calorimeter instrumenting the walls of the decay tunnel, while muon stations after the hadron dump can monitor muons from pions. We report an update on the status of the project.
AbstractThe ALICE TOF array will be built using the Multigap Resistive Plate Chamber(MRPC) configured as a double stack. Each stack contains 5 gas gaps with width of 250 μm. There has been an intense ...R&D effort to optimise this new detector to withstand the problems connected with the high level of radiation at the LHC. One clear outcome of the R&D is that the growth of the gas avalanche is strongly affected by space charge. The effect of the space charge is a decrease in the rate of change in gain with electric field; this allows more stable operation of this detector. We have measured the gain as a function of the electric field and also measured the ratio of the fast charge to the total charge produced in the gas gap. It is well established that RPCs built with 250 μm gas gap have a much superior performance than 2 mm gaps; we discuss and compare the performance of 250 μm gap MRPCs with 2 mm gap RPCs to show the importance of space-charge limitation of avalanche growth.PACS: 29.40.Cs – 7.77.-n – 52.80.Dy
We have investigated the operation of the multigap resistive plate chamber (MRPC) for the ALICE-TOF system with a gas mixture free of flammable components. Two different gas mixtures, with and ...without iso-C
4H
10 have been used to measure the performance of the MRPC. The efficiency, time resolution, total charge, and the fast to total charge ratio have been found to be comparable.
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