15-16 Oct 2005 Alice-USA meetingAleksei Pavlinov GEANT EMCAL geometry for ALICE current status Aleksei Pavlinov WSU.

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Presentation transcript:

15-16 Oct 2005 Alice-USA meetingAleksei Pavlinov GEANT EMCAL geometry for ALICE current status Aleksei Pavlinov WSU

15-16 Oct 2005 Alice-USA meetingAleksei Pavlinov Deposited energy – response of calorimeter Shower evolution  Light collection in Sc plates  Light attenuation in fibers  Quantum efficiency  Threshold and noise in the readout system 

15-16 Oct 2005 Alice-USA meetingAleksei Pavlinov TRD1  TRD2 : common structure TRD1 TRD2

15-16 Oct 2005 Alice-USA meetingAleksei Pavlinov TRD1  TRD2 :  response uniformity (only EMCAL)

15-16 Oct 2005 Alice-USA meetingAleksei Pavlinov TRD1  TRD2 :  response uniformity(complete ALICE) 1.In both cases response changes significantly around super module crack. 2. TRD1 case is more uniform inside super module than TRD2 one.

15-16 Oct 2005 Alice-USA meetingAleksei Pavlinov Radiation length distribution before EMCAL

15-16 Oct 2005 Alice-USA meetingAleksei Pavlinov TRD1  TRD2 : jet response uniformity(only EMCAL) 1. Calorimeter response is uniform for TRD2 case. 2. Non uniformity is around ~10-12% for case of TRD1 TRD1 is our choice

15-16 Oct 2005 Alice-USA meetingAleksei Pavlinov What changed in calorimeter design and Geant geometry? Calorimeter coverage: 60 0 <  <180 0  80 0 <  <110 0 Structure of GEANT geometry was changed – super modules are not the same Added gap between super module in phi directions – 1cm Sampling of calorimeter prototype is 1.6mm*1.6mm (sampling was 2mm*2mm in our simulation) Passive scintillator tile was added in front of module. Geant cuts (cutele and cutgam) were changed Sc: ILOSS=2 – continuous energy loss without generaion of  - rays and full Vavilov-Landau-Gauss fluctuation; cutele=1 MeV, cutgam=80KeV; PB: ILOSS=1(3) – continuous energy loss with generaion of  - rays and restricted Landau fluctuation; cutele=1 MeV, cutgam=80KeV;

15-16 Oct 2005 Alice-USA meetingAleksei Pavlinov EMCAL response vs Geant cuts(sampling) cutele=100kev cutgam=80kev 1.6mm*1.6mm cutele=1Mev cutgam=80kev

15-16 Oct 2005 Alice-USA meetingAleksei Pavlinov EMCAL response vs Geant cuts – 2 cutele=cutgam Old:  GeV CPU:  100 kev  0.85 sec/ev  default  50 kev  1.15 sec/ev  10 kev  11.2 sec/ev TRD1_2x2_FINAL_100DEG_10KEV

15-16 Oct 2005 Alice-USA meetingAleksei Pavlinov What to do for DOE review? 1.Commit to cvs last changing in EMCAL software and test 2.Make list for needing simulation and run it (big job) 3.Recalculate the sampling fraction coefficient (several days) 4.Recalculate hadronic response of EMCAL (big job) 5.Make needing physics analysis   0 /  separation  e/hadrons separation  jet reconstruction  ……