Performances of the CsI(Tl) detector element of the GLAST calorimeter Bédérède, D.; Bougamont, E.; Bourgeois, Ph ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
02/2004, Volume:
518, Issue:
1
Journal Article
Peer reviewed
The CsI(Tl) Detector Element (CDE) is the unit of detection of the calorimeter subsystem of the Large Area Telescope (LAT) of the GLAST satellite (IEEE Nuclear Science Symposium, 2002), which will be ...launched in September 2006. The LAT consists of 4×4 identical towers, each one including a strip silicon tracker on the top and a CsI(Tl) calorimeter on the bottom. A segmented plastic scintillator anticoincidence detector surrounds the 16 towers. The calorimeter modules, 8 layers of 12 CDEs each, have a hodoscope's shape to allow the measurement of the gamma-ray direction.
The CDE main characteristics are its Light Yield, the energy resolution and the tapering, ratio of left/right signals used for the determination of the crossing position of the particle in the crystal.
The CDE have to operate in space at about −10°C. We will describe the CDE, the optimization of its main parameter, the L.Y., and finally its variation with temperature.
Environmental tests of the GLAST validation module calorimeter Ferreira, O.; Bogaert, G.; Bonnemaison, A. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
09/2004, Volume:
530, Issue:
3
Journal Article
Peer reviewed
This paper describes the results of vibration tests using the Validation Module of the GLAST Gamma Large Area Telescope calorimeter structure. The composite structure has been tested with different ...vibration spectra expected during the launch environment of GLAST. No degradation of the mechanical assembly was observed, and deformations and displacements stayed within stay-clear limits.
High resolution drift chambers for the NA48 experiment at CERN Béderède, D; Chèze, J.B; De Beer, M ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
12/1995, Volume:
367, Issue:
1
Journal Article
Peer reviewed
We discuss construction details of large drift chambers for the NA48 experiment at CERN. Preliminary measurements on their performance are also presented.
SICAL — a high precision silicon-tungsten luminosity calorimeter for ALEPH Bédérède, D.; Beuville, E.; Bloch-Devaux, B. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
11/1995, Volume:
365, Issue:
1
Journal Article
Peer reviewed
Open access
The design, construction and performance of a silicon-tungsten electromagnetic calorimeter built to achieve an experimental luminosity measurement precision at LEP≤0.1% is described. The detector ...uses homogeneous construction to give full azimuthal acceptance for Bhabha scattering over polar angles from 24 to 58 mrad. Detailed information concerning shower development is obtained from zero-suppressed readout of the 12288 pads of the detector. Trigger decisions are generated from a rapid flash-ADC system using programmable gate arrays.
The beam and detector, used for the NA48 experiment, devoted to the measurement of
Re
(
ε
′
/
ε
)
, and for the NA48/1 experiment on rare
K
S
and neutral hyperon decays, are described.
The Large Area Telescope (LAT) on--board the Fermi Gamma ray Space Telescope began its on--orbit operations on June 23, 2008. Calibrations, defined in a generic sense, correspond to synchronization ...of trigger signals, optimization of delays for latching data, determination of detector thresholds, gains and responses, evaluation of the perimeter of the South Atlantic Anomaly (SAA), measurements of live time, of absolute time, and internal and spacecraft boresight alignments. Here we describe on orbit calibration results obtained using known astrophysical sources, galactic cosmic rays, and charge injection into the front-end electronics of each detector. Instrument response functions will be described in a separate publication. This paper demonstrates the stability of calibrations and describes minor changes observed since launch. These results have been used to calibrate the LAT datasets to be publicly released in August 2009.
The NA48 collaboration is preparing a new experiment at CERN aiming to study
CP violation in the K
0-
K
0
system with an accuracy of 2 × 10
−4 in the parameter
R
e(ϵ′/ϵ). Decays in two
π
0's will be ...recorded by a quasi-homogeneous liquid krypton calorimeter. A liquid krypton calorimeter has been chosen to combine good energy, position and time resolution with precise charge calibration and long-term stability. The prototype calorimeter incorporating the final design of the electrode read-out structure is presented in this paper. An energy resolution of
≃3.5%
√E
with a constant term smaller than 0.5% has been obtained. The time resolution was found to be better than 300 ps above 15 GeV.
A purity monitoring system for the H1 liquid argon calorimeter Barrelet, E.; Andrieu, B.; Babaev, A. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
09/2002, Volume:
490, Issue:
1
Journal Article
Peer reviewed
Open access
The ionization probes used for monitoring the liquid argon purity in the H1 calorimeter are described and results of their operation in tests at CERN and during the period 1992 to the end of 1998 at ...HERA are given. The high sensitivity of the charge measurements leads to refined charge collection models, and to the observation of a variation of the ionization yield of our electron sources with temperature.
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