1. Geant4 Tutorial, Oct28 th 2003V. Daniel Elvira Geant4 Simulation of the CMS 2002 Hcal Test Beam V. Daniel Elvira Geant4 Tutorial

2. Geant4 Tutorial, Oct28 th 2003V. Daniel Elvira HO HE ( extend to |  |=3) HB (|  |<1.3) The CMS Detector HF (extend to |  |=5) 8.6 m

3. Geant4 Tutorial, Oct28 th 2003V. Daniel Elvira HB Calorimeter (central) Sampling calorimeter: brass (passive) & scintillator (active) Coverage: |  |<1.3 Depth: 5.8 int (at  =0) segmentation:  x   resolution: ~ 120 %/ 0.087x0.087 20 o Completed & assembled 17 layers longitudinally,  x  = 4 x 16 towers 

4. Geant4 Tutorial, Oct28 th 2003V. Daniel Elvira HO Calorimeter (outer) Total number of int till the last sampling layer of HB is < 8 HO: 2 scint. layers around first  layer (extend to~11 int ) ~ 5% of a 300 GeV  energy is leaked outside the HB HO improves  resolution by ~10% at 300 GeV & linearity Test Beam 2002 Ring 0 Ring 1 Ring 2

5. Geant4 Tutorial, Oct28 th 2003V. Daniel Elvira HE Calorimeter Completed, assembled, HE-1 installed Sampling calorimeter: brass (passive) & scintillator (active) Coverage: 1.3<|  |<3 Depth: 10 int segmentation:  x   resolution: ~ 120%/ 0.087x0.087 20 o 19 layers longitudinally

6. Geant4 Tutorial, Oct28 th 2003V. Daniel Elvira HF Calorimeter Steel absorbers, embedded quartz fibres // to the beam Fast (~10 ns) collection of Cherenkov radiation. Coverage: 3<|  |<5 segmentation:  x  Depth: 10 int 10 o x 13  towers Fibre insertion finished by Nov 03

7. Geant4 Tutorial, Oct28 th 2003V. Daniel Elvira ECal 7x7 Crystal Matrix (movable) 2 HCal HB Modules HO Panels Aluminum Slab HCal 2002 Test Beam beam Moving table Small scale experiment to demonstrate that HCal works: 49 ECal crystals, 144 HB channels, 16 HO channels. Over 100 Million Events!  - : 225 GeV e - : 20,30,50,100 GeV  - : 20,30,50,100, 300 GeV Read out with a 29.6 ns period

8. Geant4 Tutorial, Oct28 th 2003V. Daniel Elvira     Based on 1-5,000   events onto the (  )=(6,2) tower of the HB and crystal 25 of the ECal matrix TB02 Simulation ( OSCAR/G4 ) Crystal 25 An accurate Monte Carlo simulation is critical: detector design & calibration, data analysis Validation of GEANT4/OSCAR by June03 for M.C. production towards DC04 & physics TDR)

9. Geant4 Tutorial, Oct28 th 2003V. Daniel Elvira Beam Line: Tracking & Triggers In the experiment, the beam is fixed and the detector moves on the table. In the simulation, the HB & HO are fixed and the beam moves. The Beam Line & Crystal Matrix systems translate and rotate with the beam as it points to different sections of the HB. pivot Trigger Scintillators (1 cm thick) beam Wire chamber Wire chamber y x z = 14 x 14 cm y x z = 4 x 4 cm y x z = 2 x 2 cm 373 cm 91 cm 280 cm 81 cm 65 cm airair airair

10. Geant4 Tutorial, Oct28 th 2003V. Daniel Elvira Crystal Matrix Array (Ecal) The Crystal Matrix box is movable (translation and rotation) Fixation point beam Al box wall Al box wall (2 mm) 0.7 cm Al 5+2.3cm (plexiglass) 7 x 7 array of crystals (49 units): 23.6x2.2x2.2 cm 172 cm (Min), 392 cm (Max in diagonal) 121.5 cm 45.8 cm 8 cm pivot Al 23 cm 84.1 cm 11.4 cm 10.5 cm 286.6 cm to the end of the HB calorimeter u/r corner crystal crashed 5 mm shift of crystal array with respect to the light guides CMS interaction point (origin for distances)

11. Geant4 Tutorial, Oct28 th 2003V. Daniel Elvira Side view of the Beam Line System Angle view of the Beam Line System 10 GeV electron Wire chambers Trigger Tiles OpenGL Visualization within The G4-OSCAR frame

12. Geant4 Tutorial, Oct28 th 2003V. Daniel Elvira Local universe for Ecal system Crystal array Aluminum box Aluminum blocks Plexiglass block Side view Beam x y x z y

13. Geant4 Tutorial, Oct28 th 2003V. Daniel Elvira Aluminum blocks Plexiglass block 7x7 array of 2.2x2.2x23.6 cm (2.5x2.5) 0.5 mm gap x z y

14. Geant4 Tutorial, Oct28 th 2003V. Daniel Elvira Aluminum blocks Plexiglass block 2 mm thick Al wall Side view of crystals: transverse section growth is apparent

15. Geant4 Tutorial, Oct28 th 2003V. Daniel Elvira Angle view of the full TB02 detector Side view of the eCal & HB sections of the TB02 detector 10 GeV electron HB2 eCal HB eCal HO Beam Line HB1 17 layers of absorber + scintillator (blue) 2 (1) layers of scintillator (red)

16. Geant4 Tutorial, Oct28 th 2003V. Daniel Elvira HO HB eCal Beam Line Crystals HB 100 GeV pion Angle view of the full TB02 detector Side view of the eCal & HB sections of the TB02 detector 100 GeV pion

17. Geant4 Tutorial, Oct28 th 2003V. Daniel Elvira Analysis Package A ROOT based analysis package is now included in the TB02 OSCAR simulation: Stat. histos (energy per layer), event ntuple with scintillator energy info per layer, 5x5 super-tower, etc.

18. Geant4 Tutorial, Oct28 th 2003V. Daniel Elvira mean : 0.875 ADC = 262 MeV HB Pedestal sigma distribution E  corr = 121.5*E HB 5x5 +1.05*E ECal 3x3 E HB scint E HB scint + 0.1* E HB scint MeV * Rand E HB tower E HB tower + 262 MeV * Rand Long. Non-uniformity Electronic Noise Calibration factors E ECal tower E ECal tower + 115 MeV * Rand MC Analysis: Calibration & Noise Electronic Noise HCal calibration with 50 GeV pions on HB only: less than 1% of the energy in scintillators (5x5 matrix) ECal calibration with 100 GeV electrons on Ecal only: ~95% of the energy is contained (3x3 matrix) Noise in HB

19. Geant4 Tutorial, Oct28 th 2003V. Daniel Elvira Resolution Resolutions: M.C. & data agree very well Linearity (normalized at 100 GeV) M.C. and data agree to within ~2%. Shape difference? Source of discrepancy could be e/h (e.m. & nuclear x-sec), punch through (shower length) ? Improved Analysis: Pions Add more energy points at below 20 and above 150 GeV: 10, 25, 200, 250, 300 GeV, and higher stats as low energy

20. Geant4 Tutorial, Oct28 th 2003V. Daniel Elvira Pion Shower Profiles: 20 GeV 20 GeV pions onto HB tower: ( ,  )=(9,4) Long. Prof. is: E scint layer fraction (area normalized) Transverse Profile: (integrated from outside) Longitudinal Profile Time Profile 21% of the energy outside tower (9,4) L mean = 4.86 T mean = 28.25 ns 21% cmsim and 18% cms oscar2

21. Geant4 Tutorial, Oct28 th 2003V. Daniel Elvira Pion Shower Profiles: 100 GeV Transverse Profile: (integrated from outside) Time Profile 100 GeV pions onto HB tower: ( ,  )=(9,4) Long. Prof. is: E scint layer fraction (area normalized) Longitudinal Profile 14% of the energy outside tower (9,4) 16% cmsim and 15% cms oscar2 L mean = 6.75 T mean = 29.15 ns

22. Geant4 Tutorial, Oct28 th 2003V. Daniel Elvira Pion Shower Profiles: 300 GeV Transverse Profile: (integrated from outside) Longitudinal Profile Time Profile 300 GeV pions onto HB tower: ( ,  )=(9,4) Long. Prof. is: E scint layer fraction (area normalized) 13.5% of the energy outside tower (9,4) 13% cmsim and 13.5% cms oscar2 L mean = 7.14 T mean = 29.71 ns