Study of multianode photomultipliers for the electromagnetic calorimeter preshower read out of the lhcb experiment

• Published in: Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Vol. 504; no. 1-3; pp. 9 - 13
• Main Authors: Ajaltouni, Z., Bohner, G., Carloganu, C., Cornat, R., Crouau, M., Deschamps, O., Henrard, P., Lecoq, J., Lefèvre, R., Monteil, S., Perret, P., Rimbault, C., Aguilo, Ernest, Garrido, Lluis, Gascon, David, Graciani, Ricardo, Ballabriga, Rafael, Vilasis-Cardona, Xavier
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 21.05.2003
• Subjects: LHCb; Multianode; Photomultipliers; Preshower; Read out; Photomultipliers; LHCb; Read out; 85.60.H; Preshower; Multianode
• ISSN: 0168-9002; 1872-9576
• DOI: 10.1016/S0168-9002(03)00742-3

The Lhcb experiment will study the CP symmetry violation in the system of the beauty particles. The detector is a 20-m-long spectrometer, to be installed on the proton–proton collider Lhc. Of major importance for the level 0 trigger is the preshower of the electromagnetic calorimeter designed to discriminate between electrons, hadrons and photons. The preshower cells consist of a two-radiation-length lead sheet located between two plastic scintillator planes. The scintillation light is extracted with wavelength-shifting fibres. The best candidates to read out the light of the 6000 detector cells are multianode photomultipliers. The HAMAMATSU photomultiplier R5900-00-M64 has been studied and its responses in terms of gain, linearity, uniformity within and between the anodes and cross-talk between the channels are addressed in this document.