Performance of the electromagnetic calorimeter of the HERMES experiment Avakian, H; Bianchi, N; Capitani, G.P ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
11/1998, Letnik:
417, Številka:
1
Journal Article
Recenzirano
Odprti dostop
The performance of the electromagnetic calorimeter of the HERMES experiment is described. The calorimeter consists of 840 radiation resistant F101 lead-glass counters. The response to positrons up to ...27.5
GeV, the comparison between the measured energy and the momentum reconstructed from tracking, long-term stability, hadron rejection and neutral meson invariant mass reconstruction are shown.
The measurement of the response of the large-angle electromagnetic shower calorimeter (LAC) of the CLAS detector to minimum ionizing particles is reported. The experimental set-up and the adopted ...procedures are described. The results of the light attenuation length in the calorimeter, the light output and the resolution of the interaction point reconstruction are discussed. The performances of the LAC match well with those required.
20 BGO crystals with photomultiplier readout that form one sector of a large solid angle BGO calorimeter, were exposed to an intermediate energy tagged photon beam. Linearity, multiplicity and ...resolution results are presented and discussed.
The gain control system for the COPP (coincidence photon–proton) apparatus Capitani, G.P.; Luxardo, S.; Massone, A.M. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
08/1998, Letnik:
413, Številka:
1
Journal Article
Recenzirano
We have built and operated a system which monitors and controls the response of the 12 lead-glass and the 12 plastic scintillator detectors in the COincidence Photon–Proton (COPP) apparatus. We ...present here the detailed operation of the system and its performances during the experiment’s runs. The gain control system, acting on the high-voltage values of the photomultiplier tubes, allows one to achieve a long term gain stability as good as 2% for each detector.
The behaviour of plastic scintillator bars with length up to 450 cm, designed for the CLAS large angle electromagnetic shower calorimeter, is considered in relation to the overall calorimeter ...response function. In particular methods adopted to measure the light emission yield and transmission efficiency are described and the influence of the scintillator bar properties on the calorimeter energy read-out and timing is discussed. We found that the new scintillator NE110A manufactured by NE Technology Ltd. showed the best agreement with our demands. The effect of wrapping materials on the scintillator bar properties has been studied considering also the temperature variations expected in Hall B at CEBAF.
The performance of the new NE110A plastic scintillator has been measured in connection with the construction of the AIACE large angle electromagnetic calorimeter for the CLAS detector at CEBAF. ...Measurements concerning 2128 scintillator bars 15 mm thick, roughly 10 cm wide and up to 450 cm length are reported. The results show an attenuation length of the order of 400 cm, a light output of ≥40 photoelectrons/MeV and a uniformity >98%.
Performance of F101 radiation resistant lead glass shower counters Avakian, H.; Bianchi, N.; Capitani, G.P. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
08/1996, Letnik:
378, Številka:
1
Journal Article
Recenzirano
The performance of F101 lead glass as a Cherenkov radiation material was studied. A 3 × 3 array of 9 × 9 cm
2 and 50 cm length counters showed an energy resolution of
≈5.0%
E(GeV)
, good linearity in ...the energy range from 1 to 25 GeV and
π
−
e
rejection of ≈4 × 10
−4.
The light response of pions, protons and deuterons with respect to electrons of the same energy is measured in a BGO calorimeter using the inclusive
16O(e, e′),
16O(e, π),
16O(e, p) and
16O(e, d) ...reactions. An average 5% quenching is found in the 100–500 MeV energy range of this experiment.
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