GEANT EMCAL geometry for ALICE current status Aleksei

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

TRD 1 TRD 2 : common structure TRD 1 TRD 2 15 -16 Oct 2005 Alice-USA meeting Aleksei Pavlinov

TRD 1 TRD 2 : response uniformity (only EMCAL) 15 -16 Oct 2005 Alice-USA meeting Aleksei Pavlinov

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

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

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

What changed in calorimeter design and Geant geometry? • Calorimeter coverage: 600< <1800 800< <1100 • Structure of GEANT geometry was changed – super modules are not the same • Added gap between super module in phi directions – 1 cm • Sampling of calorimeter prototype is 1. 6 mm*1. 6 mm (sampling was 2 mm*2 mm 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 Me. V, cutgam=80 Ke. V; PB: ILOSS=1(3) – continuous energy loss with generaion of rays and restricted Landau fluctuation; cutele=1 Me. V, cutgam=80 Ke. V; 15 -16 Oct 2005 Alice-USA meeting Aleksei Pavlinov

EMCAL response vs Geant cuts(sampling) cutele=100 kev cutgam=80 kev 1. 6 mm*1. 6 mm cutele=1 Mev cutgam=80 kev 15 -16 Oct 2005 Alice-USA meeting Aleksei Pavlinov

EMCAL response vs Geant cuts – 2 CPU: cutele=cutgam q 100 kev 0. 85 sec/ev default q 50 kev 1. 15 sec/ev TRD 1_2 x 2_FINAL_100 DEG_10 KEV q 10 kev 11. 2 sec/ev Old: 0. 828 0. 023 Ge. V 15 -16 Oct 2005 Alice-USA meeting Aleksei Pavlinov

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