Electronic detection of focused Cherenkov rings from aerogel De Leo, R.; Lagamba, L.; Manzari, V. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
12/1997, Letnik:
401, Številka:
2
Journal Article
Recenzirano
The recent development of highly transparent aerogel has permitted its use as a Cherenkov radiator in a focused (non-Rayleigh-scattered) mode. We report on the optical properties of this aerogel ...obtained by observation of Cherenkov rings with single-electron-sensitive phototubes. The dependence on aerogel radiator thickness of the number of Cherenkov ring hit points and background is shown and compared to expectations. A 5 cm thick radiator of this aerogel will permit
π
K
identification up to 20 GeV/c.
We present recent results of the study of surface properties and quantum efficiency (QE) of CsI photocathodes prepared on various substrates. Microanalysis methods provide laterally resolved surface ...morphology and chemical composition of the photoemissive film. Integral measurements of the QE of CsI were done with a monochromator system and a RICH device. It was shown that CsI films deposited on large area Ni- or Ni-Au-coated printed circuit electrodes have a uniform crystalline structure and an average QE close to that reached on polished stainless steel. The films have a good stability in air over periods of 1 h. On a microscopic scale of 3–30 μm, the films exhibit nonuniform emission properties correlated with variations in the chemical composition.
Morphological effects in the quantum yield of cesium iodide Almeida, J.; Barbo, F.; Bertolo, M. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
07/1995, Letnik:
361, Številka:
3
Journal Article
Recenzirano
We demonstrated that polycrystalline cesium iodide (CsI) on large area
Ni
Au
coated printed board provides a quantum efficiency (QE) higher by a factor of 2 than the films deposited on the standard
...Cu
Au
printed circuits. This is the most important result of the present systematic study of the QE lateral inhomogeneity for CsI on different substrates. We found a strong correlation between the QE lateral variation and the morphological homogeneity of the films. The QE was measured by UV photoelectron emission microscopy and spatially resolved X-ray photoemission, and the morphology studies were performed by secondary electron microscopy, X-ray diffraction and scanning tunneling microscopy.
We have investigated the timing properties of BC408 scintillator rods with a length of 2 m, a width of 4 cm, and thicknesses of 0.5, 1, 2, and 4 cm, for scintillation light produced by minimum ...ionizing particles crossing the thickness of the rods. A deterioration of the timing properties, inversely related to the rod thickness, has been observed for scintillation light produced far from the read-out phototube. The timing resolution worsens by nearly 2 ns/m for the thinnest rod.
Recent results on the properties of CsI photocathodes Berger, H; Besson, P; Bourgeois, Ph ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
06/1995, Letnik:
360, Številka:
1-2
Journal Article
Recenzirano
We report here on the results obtained by the CERN RD26 collaboration on the production and characterization of large area photocathodes, susceptible to equip fast UV-photon imaging devices. Such ...detectors are planned for some Ring Imaging Cherenkov (RICH) detector projects, in particular HADES at SIS Darmstadt, BABAR at the SLAC asymmetric B-factory, and ALICE at the LHC (CERN).
Λ,
Ξ and
Ω yields and transverse mass spectra have been measured in Pb-Pb and p-Pb collisions at 158 A GeV/
c. The yields in Pb-Pb interactions are presented as a function of the collision centrality ...and compared with those obtained from p-Pb collisions. Strangeness enhancement is observed which increases with centrality and with the strangeness content of the hyperon.
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