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Delia Hasch

first results from EMCal test beam. Delia Hasch. TPC. EMCal. RICH. TRD. support structure. TOF. PHOS. the EMCal case. fast trigger for high p T jets, g ( p 0 ), e -. jet physics:. back-to-back to PHOS acceptance: -0.7 < h < 0.7; D f = 110 °

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Delia Hasch

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  1. first results fromEMCal test beam Delia Hasch

  2. TPC EMCal RICH TRD support structure TOF PHOS the EMCal case fast trigger for high pT jets, g (p0), e- jet physics: • back-to-back to PHOS • acceptance: -0.7 <h < 0.7; Df = 110° • granularity ~12k channels • tower:DhxDf~ 0.014 x 0.014 • energy resolution ~10%/√E highly improves jet reconstruction good g/p0 discrimination  direct g@high pT good e/h discrimination  heavy quark jets @high pT

  3. EMCal module Al Pb Steel Scint. Fiber. low cost  sampling calorimeter time schedule  modular option • geometry: • trapezoidal - projective • single tower: 6x6x25 cm3 • 1 module: 4 towers • technology: • sampling calorimeter: • 1.76 mm scint • 1.44 mm Pb • 77 layers for total of20X0 • light readout shashlik, 36.7cm wave length shifter fiber • APD+CSP readout, FEE adopted from TPC and PHOS

  4. 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

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

  6. 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

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

  8. 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

  9. EMCal test beam sept/oct 2007 @cern SPS/PS e-/p: (0.5)1-6 GeV e-: (5) 10-100 GeV p : 40-100 GeV goals energy and position resolution linearity + uniformity of energy response shower shapes for electrons and hadrons develop calibration tools (gain stability, time dependence) SPS PS

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

  11. EMCal test beam sept/oct 2007 @cern SPS/PS Sc1,2 calo ‘delay’ DC (beam diagnostics) DC e- 5-100 GeV p 40-100 GeV movable platform setup @SPS • position scans @fixed energy • energy scan • hadron beam reference measurm.s • tilted configurations • beam size ~1 cm2 • momentum spread ~1% rms

  12. EMCal test beam sept/oct 2007 @cern SPS/PS event display 4x4 modules: 8x8 towers LED pulses: ADC vs time-sample# tower-by-tower differences due to different layout for LED installation LED pulser  monitor stability of gain

  13. EMCal test beam sept/oct 2007 @cern SPS/PS event display 4x4 modules: 8x8 towers e- beam: ADC vs time-sample# • different positions • different energies • tilts • hadron beam

  14. EMCal test beam sept/oct 2007 @cern SPS/PS data analysis DAQ : pcemcal001 • DATE for EMCal readout • online checks (aliroot plotting macros) CASTOR tape storage + analysis: • CASTOR tape storage; registered in AliEn • not yet AliRoot official area: AliRoot/AliEn reco • mapping CAF analysis • calibration parameters like gains, temperature info, ecc.  OCDB [AliEMCALRawDecoder, AliEMCALRawDigiProducer, …] [thanks to Marco v.L., David S., Boris P., a.o.]

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

  16. EMCal test beam sept/oct 2007 @cern SPS/PS off by factor 1.2 energy reconstruction full AliEn reconstruction chain 80 GeV e-@fixed position linearity Ereconstructed [GeV] !caveats: preliminary calibation, beam momentum spread not unfolded

  17. EMCal test beam sept/oct 2007 @cern SPS/PS 68.5 ± 0.4 position scan: uniformity 80 GeV incident beam energy !caveats: preliminary calibation, beam momentum spread not unfolded

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

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

  20. 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; AliEn for offline analysis) cosmics calibration of modules just started  reference relative energy calibration ready to start production of EMCal

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