first results from EMCal test beam Delia Hasch

the EMCal case jet physics: EMCal fast trigger for high p. T jets, TPC • back-to-back to PHOS RICH TRD support structure g (p 0), e- TOF • acceptance: -0. 7 < h < 0. 7; Df = 110° • granularity ~12 k channels • tower: Dh x Df ~ 0. 014 x 0. 014 • energy resolution ~10%/√E PHOS highly improves jet reconstruction good g/p 0 discrimination direct g @high p. T good e/h discrimination heavy quark jets @high p. T

EMCal module low cost sampling calorimeter time schedule modular option • geometry: – trapezoidal - projective – single tower: 6 x 6 x 25 cm 3 – 1 module: 4 towers • technology: – sampling calorimeter: 1. 76 mm scint 1. 44 mm Pb 77 layers for total of 20 X 0 Al Pb – light readout shashlik, 36. 7 cm Steel wave length shifter fiber – APD+CSP readout, FEE adopted from TPC and PHOS Scint. Fiber.

EMCal readout PHOS readout electronics adopted (APD: Avalanche Photo Diode) APD test station: determine APD gain dependence on bias voltage measure gain dependence on operation temperature evaluate nominal voltage setting for gain M=30

APD test station @Catania [GRAZIE al gruppo di Catania, Paola La Rocca] standard –EMCal electronic chain light from LED flasher fluid from a chiller at fixed temperature

APD test results from Catania [GRAZIE al gruppo di Catania, Paola La Rocca] first sample of 80 APDs analysed for test beam start test activities for mass production

EMCal test beam sept/oct 2007 @cern SPS/PS module assembly @LNF final module design + electronics chain assembly station scintillator tile lead tile 350 kg pressure wrapping final module

EMCal test beam sept/oct 2007 @cern SPS/PS module assembly @LNF 4 ministrips of 4 modules: 2 from LNF 2 from WSU WLS insertion strongback fixed

EMCal test beam sept/oct 2007 @cern SPS/PS goals energy and position resolution linearity + uniformity of energy response shower shapes for electrons and hadrons develop calibration tools (gain stability, time dependence) PS e-/p: (0. 5)1 -6 Ge. V SPS e-: (5) 10 -100 Ge. V p: 40 -100 Ge. V

EMCal test beam sept/oct 2007 @cern SPS/PS setup

EMCal test beam sept/oct 2007 @cern SPS/PS setup @SPS calo DC ‘delay’ DC Sc 1, 2 (beam diagnostics) e 5 -100 Ge. V p 40 -100 Ge. V movable platform position scans @fixed energy scan hadron beam reference measurm. s tilted configurations • beam size ~1 cm 2 • momentum spread ~1% rms

EMCal test beam sept/oct 2007 @cern SPS/PS event display LED pulses: ADC vs time-sample# tower-by-tower differences due to different layout for LED installation LED pulser monitor stability of gain 4 x 4 modules: 8 x 8 towers

EMCal test beam sept/oct 2007 @cern SPS/PS event display e- beam: ADC vs time-sample# • different positions • different energies • tilts • hadron beam 4 x 4 modules: 8 x 8 towers

EMCal test beam sept/oct 2007 @cern SPS/PS data analysis DAQ : DATE for EMCal readout online checks (aliroot plotting macros) tape storage + analysis: pcemcal 001 CASTOR tape storage; registered in Ali. En Ali. Root/Ali. En reco not yet Ali. Root official area: • mapping • calibration parameters like gains, temperature info, ecc. OCDB CAF analysis [Ali. EMCALRaw. Decoder, Ali. EMCALRaw. Digi. Producer, …] [thanks to Marco v. L. , David S. , Boris P. , a. o. ]

EMCal test beam sept/oct 2007 @cern SPS/PS energy reconstruction full Ali. En reconstruction chain 80 Ge. V e- @fixed position 80 Ge. V p @fixed position Ereconstructed [Ge. V] !caveats: preliminary calibation, beam momentum spread not unfolded

EMCal test beam sept/oct 2007 @cern SPS/PS energy reconstruction full Ali. En reconstruction chain 80 Ge. V e- @fixed position linearity off by factor 1. 2 Ereconstructed [Ge. V] !caveats: preliminary calibation, beam momentum spread not unfolded

EMCal test beam sept/oct 2007 @cern SPS/PS position scan: uniformity 80 Ge. V incident beam energy 68. 5 ± 0. 4 !caveats: preliminary calibation, beam momentum spread not unfolded

EMCal test beam sept/oct 2007 @cern SPS/PS energy resolution full Ali. En reconstruction chain single-particle simulation VERY PRELIMINARY @fixed position !caveats: preliminary calibation, beam momentum spread not unfolded

EMCal test beam sept/oct 2007 @cern SPS/PS energy resolution full Ali. En reconstruction chain VERY PRELIMINARY @fixed position test beam @FNAL !caveats: preliminary calibation, beam momentum spread not unfolded

summary & outlook test beam @SPS/PS with final module design and readout electronics energy resolution over wide momentum range position resolution linearity + uniformity of energy response shower shape analysis for electrons and hadrons usage of official Ali-online+offline tools with real data (DATE, monitoring tools; CASTOR for tape storage; Ali. En for offline analysis) cosmics calibration of modules just started reference relative energy calibration ready to start production of EMCal