Development of a fast gaseous detector: ‘Micromegas’ Barouch, G; Bay, A; Bouchigny, S ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
02/1999, Letnik:
423, Številka:
1
Journal Article
Recenzirano
Odprti dostop
Several
15×15
cm
2
gaseous Micromegas chambers (MICROMEsh GAseous Structure) which consist of a conversion gap and an amplification gap separated by a thin grid have been extensively tested in ...low-intensity
10
GeV/c
pion beam and high-intensity (up to
5×10
5
Hz/
mm
2)
100
GeV/c
muon beam. The detector behaviour has been studied with respect to many parameters: conversion gaps of 1 and 3
mm, amplification gaps of 50 and 10
μm, an external magnetic field and many different filling gases. So far no effect of the magnetic field up to 1.3
T has been observed. The gas mixture argon + cyclohexane appears to be very suitable with gains above 10
5 and a full-efficiency plateau of 50
V at 340
V. With a conversion gap as small as 1
mm and an electronics with a threshold at 5000 electrons the efficiency reaches 96%. With the addition of CF
4 a time resolution of 5
ns (RMS) has been obtained. A spatial resolution better than
60
μ
m has been observed with anode strips of
317
μ
m pitch and was explained by transverse diffusion in the gas. Simulations show that with a pitch of
100
μ
m and the appropriate gas a resolution of
10
μ
m is within reach. This development leads to a new generation of cheap position-sensitive detectors which would permit high-precision tracking or vertexing close to the interaction region, in very high-rate environments.
Shower counters for SLAC experiments E142/E143 Borel, H.; Grenier, P.; Le Meur, J. ...
IEEE Transactions on Nuclear Science,
08/1995, Letnik:
42, Številka:
4
Journal Article, Conference Proceeding
Recenzirano
We briefly describe the two electromagnetic calorimeters each made of 200 lead glass blocks used at SLAC to discriminate between electrons and pions and to measure electron energies. Procedures to ...reconstruct electron showers and to calibrate calorimeters are treated as well as the calorimeter performance.< >
The tracking system of the ALICE dimuon spectrometer Basciu, S.; Arba, M.; Atanassov, I. ...
2003 IEEE Nuclear Science Symposium. Conference Record (IEEE Cat. No.03CH37515),
2003, Letnik:
1
Conference Proceeding
The ALICE Muon Spectrometer is mainly dedicated to the measurement of the production of the J//spl psi/, and Y families through their decay into muon pairs, in Pb-Pb collisions. In this paper we give ...a description of the dimuon tracking system, mainly concentrating on the modular CSC chambers which occupy the last three stations. The R&D phase is now almost over and the production of the final modules started. A description of the main performances of the detectors based on test beam results on prototypes will be given.
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