TY - JOUR
T1 - Electron, pion and multiparticle detection with a lead/scintillating-fiber calorimeter
AU - Acosta, D.
AU - Buontempo, S.
AU - Calôba, L.
AU - Caria, M.
AU - DeSalvo, R.
AU - Ereditato, A.
AU - Ferrari, R.
AU - Fumagalli, G.
AU - Goggi, G.
AU - Hao, W.
AU - Hartjes, F. G.
AU - Henriques, A.
AU - Jenni, P.
AU - Linssen, L.
AU - Livan, M.
AU - Maio, A.
AU - Mapelli, L.
AU - Mondardini, M. R.
AU - Ong, B.
AU - Paar, H. P.
AU - Pastore, F.
AU - Poggioli, L.
AU - Polesello, G.
AU - Riccardi, F.
AU - Rimoldi, A.
AU - Scheel, C. V.
AU - Schmitz, J.
AU - Seixas, J. M.
AU - Simon, A.
AU - Sivertz, M.
AU - Sonderegger, P.
AU - Souza, M. N.
AU - Thomé, Z. D.
AU - Vercesi, V.
AU - Wang, Y.
AU - Wigmans, R.
AU - Xu, C.
AU - You, K.
N1 - Funding Information:
We are deeply grateful to the LAA Project Leader, Prof. Dr. A. Zichichi, for his vision, his warm interest and his encouraging support. The work described in this paper would have been impossible without the outstanding technical support provided by our technicians O. Barnaba, C. Baudoin, M. Borriello, S. Bricola, J.-M. Chapuis, C. Farella, B. Foligne, A. Freddi, G. Improta, G. Iuvino, F. Pagano, S. Robinson, R. Rocco, L. Rose-Dulcina, G. Sannier, C. Schillinger, A. Sigrist and V. Vanzanella. Financial support from the Istituto Nazionale di Fisica Nucleare to the Cagliari, Napoli and Pavia groups, from the Conselho National de Desenvolvimento Cientifico e Tecnologico of Brazil to the Rio de Janeiro group and from the U.S. Department of Energy and National Science Foundation to the San Diego group is acknowledged . And finally, we are grateful to the staff of the SPS, and in particular to N. Doble, for the excellent beam conditions and assistance provided during our tests.
PY - 1991/10/20
Y1 - 1991/10/20
N2 - We report on the performance of a fine-grained 13-ton lead/scintillating-fiber calorimeter, in particular on its response to electrons, pions and multiparticles (reaction products from pions interacting in a target upstream of the detector). The detector signals were studied for particles in the energy range 5-150 GeV. The energy resolution was measured to be 12.9% √E for electrons, plus a constant term dependent on the angle θZ between the particle's direction and the fiber axis. This term, which is 1.2% for θz = 3°, is shown to be due to anomalous sampling in the early shower stage. It is greatly reduced when only electrons entering the detector in the lead are considered. A 1.7X0 thick preshower detector, installed 12 cm in front of the calorimeter, only affected the signal linearity for electrons at low energy. The effect on the energy resolution was negligible. Single pions were detected with an energy resolution of ∼ 30%/√E plus a constant term, which turned out to be mainly due to the effects of light attenuation in the fibers. Knowing the impact point of the particles, these effects could be efficiently removed for single pions. For jets (multiparticles), the effects of light attenuation are much less important, leading to considerably better on-line energy resolutions. The e π signal ratio was measured to range from 1.03 at 80 GeV to 1.10 at 5 GeV, for a detector with an effective radius of 49 cm. After correcting for the instrumental effects, we found the intrinsic e h value of this detector (with our particular choice of fibers and sampling fraction) to be 1.15±0.02. Detailed results are given on the detector performance (energy resolution, e π signal ratio, e/jet signal ratio) as a function of the lateral detector size and as a function of the jet multiplicity.
AB - We report on the performance of a fine-grained 13-ton lead/scintillating-fiber calorimeter, in particular on its response to electrons, pions and multiparticles (reaction products from pions interacting in a target upstream of the detector). The detector signals were studied for particles in the energy range 5-150 GeV. The energy resolution was measured to be 12.9% √E for electrons, plus a constant term dependent on the angle θZ between the particle's direction and the fiber axis. This term, which is 1.2% for θz = 3°, is shown to be due to anomalous sampling in the early shower stage. It is greatly reduced when only electrons entering the detector in the lead are considered. A 1.7X0 thick preshower detector, installed 12 cm in front of the calorimeter, only affected the signal linearity for electrons at low energy. The effect on the energy resolution was negligible. Single pions were detected with an energy resolution of ∼ 30%/√E plus a constant term, which turned out to be mainly due to the effects of light attenuation in the fibers. Knowing the impact point of the particles, these effects could be efficiently removed for single pions. For jets (multiparticles), the effects of light attenuation are much less important, leading to considerably better on-line energy resolutions. The e π signal ratio was measured to range from 1.03 at 80 GeV to 1.10 at 5 GeV, for a detector with an effective radius of 49 cm. After correcting for the instrumental effects, we found the intrinsic e h value of this detector (with our particular choice of fibers and sampling fraction) to be 1.15±0.02. Detailed results are given on the detector performance (energy resolution, e π signal ratio, e/jet signal ratio) as a function of the lateral detector size and as a function of the jet multiplicity.
UR - http://www.scopus.com/inward/record.url?scp=25944437798&partnerID=8YFLogxK
U2 - 10.1016/0168-9002(91)90062-U
DO - 10.1016/0168-9002(91)90062-U
M3 - Article
AN - SCOPUS:25944437798
SN - 0168-9002
VL - 308
SP - 481
EP - 508
JO - Nuclear Inst. and Methods in Physics Research, A
JF - Nuclear Inst. and Methods in Physics Research, A
IS - 3
ER -