The CDF plug upgrade electromagnetic calorimeter: test beam results Albrow, M.; Aota, S.; Apollinari, G. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
03/2002, Letnik:
480, Številka:
2
Journal Article
Recenzirano
Odprti dostop
The CDF Plug Upgrade calorimeter, which fully exploits the tile–fiber technique, was tested at the Fermilab meson beamline. The calorimeter was exposed to positron, positively charged pion and ...positive muon beams with energies in the range of 5–
230
GeV
. The energy resolution of the electromagnetic calorimeter to the positron beam is consistent with the design value of
16%/
E
⊕1%
, where E is the energy in units of GeV and ⊕ represents sum in quadrature. The non-linearity for positrons is studied in an energy range of 11–
181
GeV
. It is important to incorporate the response of the preshower detector, the first layer of the electromagnetic calorimeter which is readout separately, into that of the calorimeter to reduce the non-linearity to 1% or less. The energy scale is about
1.46
pC/
GeV
with HAMAMATSU R4125 operated typically at a gain of 2.5×10
4. The response non-uniformity over the surface of a tower of the electromagnetic calorimeter is found to be about 2% with
57
GeV
positrons. Studies of several detailed detector characteristics are also presented.
Radioactive source calibration technique for the CMS hadron calorimeter Hazen, E; Lawlor, C; Rohlf, J.W ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
10/2003, Letnik:
511, Številka:
3
Journal Article
Recenzirano
Relative calibration of the scintillator tiles used in the hadronic calorimeter for the Compact Muon Solenoid detector at the CERN Large Hadron Collider is established and maintained using a ...radioactive source technique. A movable source can be positioned remotely to illuminate each scintillator tile individually, and the resulting photo-detector current is measured to provide the relative calibration. The unique measurement technique described here makes use of the normal high-speed data acquisition system required for signal digitization at the
40
MHz
collider frequency. The data paths for collider measurements and source measurements are then identical, and systematic uncertainties associated with having different signal paths are avoided. In this high-speed mode, the source signal is observed as a Poisson photo-electron distribution with a mean that is smaller than the width of the electronics noise (pedestal) distribution. We report demonstration of the technique using prototype electronics for the complete readout chain and show the typical response observed with a 144 channel test beam system. The electronics noise has a root-mean-square of 1.6 least counts, and a 1 mCi source produces a shift of the mean value of 0.1 least counts. Because of the speed of the data acquisition system, this shift can be measured to a statistical precision better than a fraction of a percent on a millisecond time scale. The result is reproducible to better than 2% over a time scale of 1 month.
Intercalibration of the longitudinal segments of a calorimeter system Albrow, M; Aota, S; Apollinari, G ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
07/2002, Letnik:
487, Številka:
3
Journal Article
Recenzirano
Three different methods of setting the hadronic energy scale of a longitudinally segmented calorimeter system are compared with each other. The merits of these methods have been studied with testbeam ...data from the CDF Plug Upgrade Calorimeter. It turns out that one of the (commonly used) calibration methods introduces a number of undesirable side effects, such as an increased hadronic signal nonlinearity and trigger biases resulting from the fact that the reconstructed energy of hadrons depends on the starting point of their showers. These problems can be avoided when a different calibration method is used. The results of this study are applied to determine the
e/
h values of the calorimeter and its segments.
We report on the response of a prototype CMS hadron calorimeter module to charged particle beams of pions, muons, and electrons with momenta up to
375
GeV/c
. The data were taken at the H2 and H4 ...beamlines at CERN in 1995 and 1996. The prototype sampling calorimeter used copper absorber plates and scintillator tiles with wavelength shifting fibers for readout. The effects of a magnetic field of up to 3
T on the response of the calorimeter to muons, electrons, and pions are presented, and the effects of an upstream lead tungstate crystal electromagnetic calorimeter on the linearity and energy resolution of the combined calorimetric system to hadrons are evaluated. The results are compared with Monte Carlo simulations and are used to optimize the choice of total absorber depth, sampling frequency, and longitudinal readout segmentation.
A preshower detector for the CDF Plug Upgrade: test beam results Albrow, M.; Aota, S.; Apollinari, G. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
07/1999, Letnik:
431, Številka:
1
Journal Article
Recenzirano
A preshower detector consisting of plastic scintillating plates with optical-fiber readout was tested at the Fermilab meson beamline. The detector was placed at a depth of about 1.5
X
0, followed by ...an electromagnetic and hadronic calorimeter, and exposed to positron, positively charged pion and positive muon beams with energies in the range of 5–227 GeV. Multianode phototubes, HAMAMATSU R5900-M16, were used for the photon readout. The efficiency for detecting two minimum ionizing particles with noise occupancy of <1% was 90–100% for gains of (1–4)×10
5. It was also found that by requiring an appropriately large signal in the preshower detector, the rate of charged pions depositing a large fraction of energy in the electromagnetic calorimeter could be reduced by a factor of 1.4–2.0 (1.4–2.8) while keeping 95% (90%) efficiency for positrons.
We present an overview of the CDF End Plug Upgrade Project. The structure of the upgraded calorimeter and the design of the optical readout system is discussed. We describe the production of ...scintillating tile/fiber multi-tile assemblies (megatiles) and present the quality control results of megatiles produced for the CDF End Plug Upgrade Hadron Calorimeter. The sample of megatiles presented in this analysis corresponds to approximately 16500 individual tile/fiber assemblies. We discuss the quality control requirements and present the distributions of the quantities measured during the QC process. The various contributions to the tile-to-tile light yield variations are isolated and discussed.< >
Within a theta = 20 degrees cone around the incident proton direction, the ratio of the average charged multiplicity for proton-Al interactions to that for proton-proton interactions is about 1 and ...is independent of missing mass and the transverse momentum of the trigger proton. The independence of the Al to H multiplicity ratio at small laboratory emission angles, under large variations of missing mass and transverse momentum, suggests that there is only one inelastic collision/nucleus in which the effective mass of EF is formed. The equality of the positive to negative track ratios for both p-p and p-Al interactions shows that energy deposition is dominated by meson production. 9 ref.--AA.
The use of moving radioactive gamma sources to assess, calibrate and monitor scintillating tile calorimeters is discussed, and the techniques and equipment are described. The capabilities of the ...technique are illustrated using Cs{sup 137} sources with the CDF Endplug Upgrade EM and Hadron calorimeters at testbeams and at a cosmic ray test stand. Source measurements of all the tiles in testbeam modules which are exact replicas of the calorimeters, predict the relative responses of EM towers to 50 GeV positrons and muons, and of Hadron towers to 50 GeV pions, with RMS accuracies of 1.3%, 1.8% and 2.0%, respectively. Source measurements will be used in lieu of testbeam measurements for the initial calibration of all towers in the final calorimeters. Source measurements of single tiles are reproducible to 0.4% and will be used to monitor gain changes of the photomultiplier tubes.
Measurement of the W boson mass Abe, F; Albrow, MG; Amidei, D ...
Physical review. D, Particles and fields,
11/1995, Letnik:
52, Številka:
9
Journal Article
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