Hasch-EMCAL-testbeam

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Hasch-EMCAL-testbeam Powered By Docstoc
					first results from
EMCal test beam
     Delia Hasch
                   the EMCal case
            jet physics:    fast trigger for high pT jets,   g (p0), e-
                             TPC
  EMCal                               • back-to-back to PHOS
                              RICH    • acceptance: -0.7 < h < 0.7; Df = 110°
                                      • granularity ~12k channels
                                TRD
support                               • tower: Dh x Df   ~ 0.014 x 0.014
structure                       TOF
                                      • energy resolution ~10%/√E

                              PHOS




                   highly improves jet reconstruction
                   good g/p0 discrimination  direct     g @high pT
                   good e/h discrimination  heavy quark jets @high pT
                      EMCal module
 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                   Al
       77 layers for total of 20 X0   Pb
   – light readout shashlik, 36.7cm   Steel
      wave length shifter fiber       Scint.
   – APD+CSP readout, FEE adopted     Fiber.
      from TPC and PHOS
                    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       fluid from a chiller at
                   flasher              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)




                                                         SPS
                PS
                                                         e-: (5) 10-100 GeV
 e-/p: (0.5)1-6 GeV
                                                         p:      40-100 GeV
EMCal test beam sept/oct 2007
@cern SPS/PS
                                setup
EMCal test beam sept/oct 2007
@cern SPS/PS
                         setup @SPS
                                                             Sc1,2
                                calo    DC         ‘delay’
                                                   DC
                                                   (beam
                                                   diagnostics)
                                                                       e-
                                                                     5-100 GeV

                                                                        p
                                                                  40-100 GeV
                                movable platform

                                    position scans @fixed energy
                                    energy scan
                                    hadron beam reference measurm.s
                                    tilted configurations

                                  • beam size ~1 cm2
                                  • momentum spread ~1% rms
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
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
EMCal test beam sept/oct 2007
@cern SPS/PS

                             data analysis
  DAQ :
                                                              pcemcal001
     DATE for EMCal readout
     online checks (aliroot plotting macros)

  tape storage + analysis:                            CASTOR
     CASTOR tape storage;
    registered in AliEn                                             AliRoot/AliEn reco
     not yet AliRoot official area:
          • mapping
          • calibration parameters like gains,       CAF analysis
          temperature info, ecc.  OCDB
        [AliEMCALRawDecoder, AliEMCALRawDigiProducer, …]

  [thanks to Marco v.L., David S., Boris P., a.o.]
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
EMCal test beam sept/oct 2007
@cern SPS/PS
               energy reconstruction
               full AliEn reconstruction chain


       80 GeV e- @fixed position
                                                   linearity




                                                 off by factor 1.2


             Ereconstructed [GeV]


              !caveats: preliminary calibation,
                            beam momentum spread not unfolded
EMCal test beam sept/oct 2007
@cern SPS/PS
             position scan: uniformity
                           80 GeV 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 AliEn 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 AliEn 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; AliEn for offline
analysis)

cosmics calibration of modules just started  reference
relative energy calibration

      ready to start production of EMCal

				
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posted:9/17/2012
language:English
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