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CBM(MuCh) Simulation & Indian Team

CBM(MuCh) Simulation & Indian Team. Zubayer Ahammed VECC, Kolkata. Simulation Framework. The FairRoot framework is fully based on the ROOT system. The user can create simulated data and/or perform analysis with the same framework. Features:.

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CBM(MuCh) Simulation & Indian Team

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  1. CBM(MuCh) Simulation & Indian Team Zubayer Ahammed VECC, Kolkata

  2. Simulation Framework The FairRoot framework is fully based on the ROOT system. The user can create simulated data and/or perform analysis with the same framework. Features: • The same framework can be used for Simulation and Analysis • Fully ROOT based: • VMC for simulation • IO scheme (TChain, friend TTrees, TFolders ) for persistency • TTask to organize the analysis data flow • Completely configurable via ROOT macros • Easy to maintain (only ROOT standard services are used) • Geometry / navigation system models • G3/G4 Native geometrical models • Geometry Modeller (TGeoManager) ( G3/FLUKA + G4)

  3. Event Generator UrQMD+PLUTO Transport particles through the detector material(GEANT3, GEANT4/FLUKA) Transport Simulation Digitizer Determine detector response Determine physical space point parameters from detector hits Hit Finder Determine momentum vector etc. for all tracks Reconstruction Analysis Physics Analysis Simulation and Analysis chain

  4. Transport Uses Virtual Monte Carlo-Scheme enabling different transport engines (GEANT3, GEANT4, FLUKA..) Run Control: The class CbmrunSim is the manager of a transport simulation run. ------builds geometry, detectors, magnetic field -------manages parameter containers -------controls VMC interface VMC interface: CbmMCApplication -----invoked by CbmRunSim Geometry: -----Materials and volumes are defined in ASCII files -----invoked by simulation macro Magnetic Field: CbmField Output: -------Written in ROOT file --------handled by CbmRootManager --------CbmMCTrack for particle tracks --------CbmMCPoint for space points User interface: User runs transport simulation via root macro. -------Necessary information has to be provided to CbmRunSim -------This initialises and runs the simulation.

  5. Our Efforts Mukesh Ershad Malik Farooq Mir Problem in the analysis macro

  6. Ershad Analysis macro corrected Mukesh

  7. original geometry(much_standard.geo) Optimization of Geometry(H. Kalikta, GU) MuchCave Zin position [cm] : 105 Acceptance tangent min : 0.1 Acceptance tangent max : 0.5 Number of absorbers : 6 Number of stations : 6 # Absorber specification Absorber Zin position [cm] : 0 40 80 120 170 225 Absorber thickness [cm] : 20 20 20 30 35 100 Absorber material : I I I I I I # Station specification Station Zceneter [cm] : 30 70 110 160 215 340 Number of layers : 2 2 2 2 2 3 Detector type : 1 1 1 1 1 1 Distance between layers [cm]: 10 10 10 10 10 10 Support thickness [cm] : 1.5 1.5 1.5 1.5 1.5 1.5 Use module design (0/1) : 1 1 1 1 1 1 4

  8. 1. Plots for the no. of entries within the inv. mass peak for different station nos.(layer nos.) red-> for signal 2. Plots for the total no. of entries for different station nos.(layer nos.) Blue-> for embedded 12

  9. Geometry Optimization Arun Praksh, BHU Selection of pad size : particle density

  10. Segmentation : First attempt, guided by particle density Av. Hit loss ~ 1.5%

  11. V1 : Station1 as seen after segmentation R=70 cm

  12. Selection of GEM module and pad size • Work with various ideal and modular geometry by the GSI-PNPI-Dubna group in simulation • GEM foils : routinely made in 30cm X 30 cm size, sector shaped GEM foil made at CERN for RD51 collaboration which is ~50cm long. Even 1m long sectors being tried. • FEE board size and mounting on the modules (too early to decide) : horizontal (parallel to detector plane) preferred. • Optimum pad size : a balance between simulation and hardware efforts

  13. Mukesh Kumar, JU 12 GeV SIS100 simulation 30 GeV

  14. System Partha Bhaduri • The specifications of the system chosen are: • Target : Au , Cu, S, O, C • Projectile : p (1, 1) • Beam energy : 30 GeV • Event generator used : HSD – 2.5 • Events : 5,000 (ISUBS = 50, NUM = 100)

  15. HSD vs. Pluto (pseudo-rapidity distribution) HSD Pluto

  16. Simulation • CbmRoot Version: Trunk version • Number of events : 4000 • Much geometry : Standard Geometry • 2 layers in 5 stations • Distance between layers 10 cm. • Gap between absorbers 20 cm • 3 layers at the last trigger station • Total 13 layers • Total length of Much 350 cm • Signal : J/y decayed muons from HSD for p+Au system for 30 GeV p beam • Background : central UrQMD events for p+ Au at 30 GeV/n • Much Hit producer w/o cluster & avalanche • L1(STS) & Lit (Much) tracking with branching Absorber thickness (cm): 20 20 20 30 35 100

  17. Invariant mass spectra Pure HSD Reconstruction efficiency : 25 % Embedded Reconstruction efficiency : 23.8 % Negligible background effect

  18. Other efforts Partha Pratim Bhaduri: Trigger algorithm Bipasha Bhowmic: Dynamic Range Calculation B. Bhattacharya : Clustering

  19. Missing Activities: AMU, Aligarh Panjab University, Chandigarh Sikkim Manipal Institute of Technology Rajasthan University, Jaipur

  20. Interactions within collaboration CBM India mailing list: cbm-india@gsi.de CBM Twiki Group: MuchIndianGroup Weekly EVO/Skype meet on Thursday: 20 times so far since July 15th, 2009

  21. Summary Our efforts in simulation is in progress. We need more efforts and dedication.

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