A LYSO calorimeter for the SuperB factory Eigen, G.; Zhou, Z.; Chao, D. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
08/2013, Letnik:
718
Journal Article
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Odprti dostop
The SuperB project is an asymmetric e+e− accelerator of 1036cm−2s−1 design luminosity, capable of collecting a data sample of 50–75ab−1 in five years running. The SuperB electromagnetic calorimeter ...(EMC) provides energy and direction measurement of photons and electrons, and is used for identification of electrons versus other charged particles. In particular we present its design, geometry study and related simulations, as well as R&D on LYSO crystals and developments on readout electronics. A matrix of 25 crystals has been tested at the Beam Test Facility of Frascati (BTF) in May 2011 at energies between 200MeV and 500MeV. Results from this test are presented.
The SuperB project is an asymmetric e+e− accelerator of 1036 cm−2s−1 luminosity, capable of collecting a 50–75 ab−1 data sample in five years of running. The SuperB electromagnetic calorimeter (EMC) ...provides energy and direction measurement of photons and electrons and identification versus other charged particles for electrons. A matrix of 25 LYSO crystals has been tested at the Beam Test Facility at Frascati in May 2011 at energies between 100 MeV and 500 MeV. Results from this test will be presented. Design and Monte Carlo studies for the general EMC system will also be presented.
The performance demanded for the Level-0 trigger of LHCb imposes very stringent requirements on the quality of the muon chambers. These chambers must pass a series of tests before being mounted in ...the experimental setup. The six tests adopted for the quality control of the chambers produced at the Laboratori Nazionali di Frascati (LNF) are described. After the wires are wound and glued on a cathode panel, the wire pitch is measured by two digital cameras with a precision of about 20 mum. The mechanical tension of the wire is deduced from its mechanical resonance frequency measured by an automated system based on a digital electrostatic method. The wire tension is obtained with a precision of about 1%. Once all elements are assembled, the gas tightness of a chamber is verified by monitoring the decrease rate of an overpressure applied to it. After a suitable high-voltage conditioning, the dark current is recorded and the gas gain uniformity of the chamber is measured using a collimated 137 Cs source which can be moved over the chamber surface. Finally, the detector is fully equipped with the front-end electronics, and its detection efficiency is tested with cosmic rays
Automated wire tension measurement system for LHCb muon chambers Ciambrone, P.; Dané, E.; Dumps, R. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
06/2005, Letnik:
545, Številka:
1
Journal Article
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Odprti dostop
A wire tension meter has been developed for the multi-wire proportional chambers of the LHCb muon detector. The wire tension is deduced from its mechanical resonance frequency. In the LHCb muon ...chambers, the wires are 2
mm apart and electrically connected in groups of 3–32, so that the wire excitation system must be precisely positioned with respect to the wire to be tested. This wire is forced to oscillate by a periodic high voltage applied between that wire and a non-oscillating “sense wire” placed parallel and close to it. This oscillation produces a variation of the capacitance between these two wires which is measured by a high precision digital electronic circuit. At the resonance frequency this capacitance variation is maximum. The system has been systematically investigated and its parameters were optimized. In the range 0.4–1
N a good agreement is found between the mechanical tension measured by this system and by a dynamometer.
Charmed-meson production by 350 GeV/c π
− particles incident on copper and tungsten targets has been studied in the WA92 experiment, performed at the CERN Ω′ spectrometer. Results obtained are ...reported and discussed. Reconstruction of decays from the set D
0 → K
−
π
+ D
0 → K
−
π
−
π
+
π
+, D
s
+ →
φπ
+ and charge conjugates has yielded a sample of 7280 ± 108 charmed mesons, produced with
χ
F
> 0, (
χ
F
) = 0.18 and〈
p
T
2〉 = 1.86 (
GeV/
c)
2. Assuming a relationship
σ =
σ
0
A
α
between the cross section, σ, per nucleus of mass
A and the nucleonic cross section,
σ
0 the α value found for the detected charmed particles is 0.95 ± 0.06 ± 0.03. Taking
α = 1, the measured cross sections per nucleon for
χ
F
> 0 production are 7.78 ± 0.14 ± 0.52
μb for
D
0/
D
0, 3.28 ± 0.08 ± 0.29 μ
b
for D
+/D
− and 1.29 ± 0.16 ± 0.33
μb for D
s
+/D
s
−. Differential cross sections with respect to
χ
F
and
p
T
2 have been determined for the various types of charmed meson, and particle-antiparticle asymmetries have been analysed.
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