CERN Accelerating science

Internal Note and Article
Report number	LHCb-INT-2011-050 ; CERN-LHCb-INT-2011-050
Title	Time alignment of the front end electronics of the LHCb calorimeters.
Author(s)	Abellan Beteta, C (Ramon Llull U., Barcelona ; ICC, Barcelona U.) ; Aguiló Chivite, E (ICC, Barcelona U.) ; Ajaltouni, Z (Clermont-Ferrand U.) ; Amhis, Y (Orsay, LAL) ; Barsuk, S (Orsay, LAL) ; Beigbeder-Beau, C (Orsay, LAL) ; Belyaev, I (Moscow, ITEP ; CERN) ; Bohner, G (Clermont-Ferrand U.) ; Bonnefoy, R (Clermont-Ferrand U.) ; Breton, D (Orsay, LAL) ; Calvo Gómez, M (Ramon Llull U., Barcelona ; ICC, Barcelona U.) ; Camilleri, L (CERN) ; Callot, O (Orsay, LAL) ; Camboni, A (ICC, Barcelona U.) ; Chanal, H (Clermont-Ferrand U.) ; Charlet, D (Orsay, LAL) ; Comerma-Montells, A (ICC, Barcelona U.) ; Cornat, R (Clermont-Ferrand U.) ; Crouau, M (Clermont-Ferrand U.) ; Dalmagne, B (Orsay, LAL) ; Deschamps, O (Clermont-Ferrand U.) ; Domingo Bonal, F (Ramon Llull U., Barcelona ; ICC, Barcelona U.) ; Drancourt, C (Annecy, LAPP) ; Duarte, O (Orsay, LAL) ; Dzhelyadin, R (Serpukhov, IHEP) ; Egorychev, V (Moscow, ITEP) ; Filippov, S (Moscow, INR) ; Fulda Quenzer, F (Orsay, LAL) ; Garra Ticó, J (ICC, Barcelona U.) ; Garrido, L (ICC, Barcelona U.) ; Gascon, D (ICC, Barcelona U.) ; Gaspar de Valenzuela, A (ICC, Barcelona U.) ; Gioi, L L (Clermont-Ferrand U.) ; Golubkov, D (Moscow, ITEP) ; Golutvin, A (Moscow, ITEP ; CERN ; Imperial Coll., London) ; González Bano, C (ICC, Barcelona U.) ; Grabalosa Gàndara, M (ICC, Barcelona U.) ; Graciani Díaz, R (ICC, Barcelona U.) ; Graugés, E (ICC, Barcelona U.) ; Gushchin, E (Moscow, INR) ; Guz, Yu (Serpukhov, IHEP) ; Jean-Marie, B (Orsay, LAL) ; Konoplyannikov, A (Moscow, ITEP ; CERN) ; Kristic, R (CERN) ; Kvaratskheliya, T (Moscow, ITEP) ; Ky, B (Orsay, LAL) ; Lecoq, J (Clermont-Ferrand U.) ; Lefèvre, R (Clermont-Ferrand U.) ; Lefrançois, J (Orsay, LAL) ; López Asamar, E (ICC, Barcelona U.) ; Machefert, F (Orsay, LAL) ; Machikhiliyan, I (Annecy, LAPP ; Moscow, ITEP) ; Martens, A (Orsay, LAL) ; Minard, M N (Annecy, LAPP) ; Monteil, S (Clermont-Ferrand U.) ; Niess, V (Clermont-Ferrand U.) ; Perret, P (Clermont-Ferrand U.) ; Picatoste Olloqui, E (ICC, Barcelona U.) ; Puig Navarro, A (ICC, Barcelona U.) ; Reinmuth, G (Clermont-Ferrand U.) ; Riera-Baburés, J (ICC, Barcelona U.) ; Robbe, P (Orsay, LAL) ; Roselló, M (Ramon Llull U., Barcelona ; ICC, Barcelona U.) ; Ruiz, H (ICC, Barcelona U.) ; Savrina, D (Moscow, ITEP) ; Schopper, A (CERN) ; Schune, M H (Orsay, LAL) ; Shatalov, P (Moscow, ITEP) ; Sobczak, K (Clermont-Ferrand U.) ; T’Jampens, S (Annecy, LAPP) ; Tocut, V (Orsay, LAL) ; Vàzquez Gómez, R (ICC, Barcelona U.) ; Viaud, B (Orsay, LAL) ; Videau, I (Orsay, LAL) ; Vilasís-Cardona, X (Ramon Llull U., Barcelona ; ICC, Barcelona U.) ; Zhokhov, A (Moscow, ITEP)
Publication	2012
Imprint	17 Nov 2011
Number of pages	30
In:	JINST 7 (2012) P08020
DOI	10.1088/1748-0221/7/08/P08020
Subject category	Detectors and Experimental Techniques
Note type	CALO
Accelerator/Facility, Experiment	CERN LHC ; LHCb
Abstract	LHCb is the experiment at the Large Hadron Collider at CERN designed for performing studies of CP-symmetry violation and rare decays of B-hadrons. Its calorimeter system allows to trigger on photons and electrons by associating the information from a scintillating pad signing charged particle (SPD), a pre-shower tagging electromagnetic particle (PS), an electromagnetic calorimeter (ECAL) and a hadronic calorimeter (HCAL). We present the principles and procedures for its fine time-alignment through the commissioning and the first collision phases. We give a particular emphasis to the choices made in the electronic design of the calorimeters to deal with the signal shape and spill over. Also we summarise the achieved levels of synchronisation.
Copyright/License	Publication: (License: CC-BY-3.0)

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