1. CERN, 7 November 2011 Anton Pytel Slovak Technical University TRIP FROM GENERATORS TO GEOMETRIES

2. Generators Event record Simulation Reconstruction Analysis Visualization Simulation output Validation Detector geometries SIMULATION DATA FLOW 2

3. Generators validation HepMCAnalysis Generator services webpage MCPLOTS GDML Geant4 and ROOT interfaces OUTLINE 3

4. Generators Event record Simulation Reconstruction analysis Visualization Simulation output Validation Detector geometries GENERATOR VALIDATION 4

5. GENSER – generator maintenance GOAL: Compare new version of generator with older - to spot the bug STARTING POINT: Tool to analyze data in hepmc format, with examples… Wrapper of the tool Script for web presentation HEPMC events.root histograms.html HEPMCANALYSIS FOR GENSER 5

6. Generation and analysis split Examples code replaced by MCPlots - MCprod EVOLUTION 6

7. INPUT Parameters: Set hepmc version Set HepMCAnalysis version Set generator Set multiple versions (up to 9) Set web accessible path FINAL STATUS 7

8. RESULT 8

9. Tuning generators Comparing against data Rivet based analysis MCPLOTS 9

10. MCPLOTS WEBPAGE 10

11. Data generation Rivet Analysis PHP based web presentation plotter.exe cache MCPLOTS – PROJECT OVERVIEW MySQL database update mcprod 11

12. PHP based web presentation plotter.exe MCPLOTS – IMPROVEMENTS Data generation Rivet Analysis mcprod 12

13. http://mcplots.cern.ch => Generator Validation => Choose generator http://mcplots.cern.ch MCPLOTS – VALIDATION 13

14. Generators Event record Simulation Reconstruction analysis Visualization Simulation output Validation Detector geometries GDML 14

15. GDML: application independent Geometry Description Markup Language Import/export classes needed Geant4 geometryGDMLROOT geometry GDML CONVERTERS 15

16. GDML EXAMPLE 16

17. Geant4: G4GDMLRead; G4GDMLWrite classes ROOT: TGDMLRead class; Python Writer GDML PREVIOUS STATUS 17

18. python script – rewritten in C++ Performance, maintainability Import/export updates according to GDML schema Compatibility updates ROOT GDML 18

19. ${ROOTSYS}/bin/root TGeoManager::Import(“input.gdml”); gGeoManager->Export(“output.gdml”); GDML USAGE IN ROOT 19

20. Divisions supported Atomic number workaround Reflected solid not used CutTube substituted MAIN FEATURES 20

21. Instead of tag - tag in physvol REFLECTED SOLID 21

22. CutTube not yet supported in Geant4 - substituted by intersection of tube and two boxes CUTTUBE 22

23. Problems during Geant4 import If base of Trap = 0 then arb8 If twisted angle of Gtra = 0 then Trap ROOT not supported solids: Tetrahedron, tessellated solid, elcone, twistedbox, twistedtrd, twistedtubs ellipsoid SOLID SPECIALTIES 23

24. Atlas geometry (29 046 966 nodes) Time improvement ~ 30 s => 6 s.gdml size imp. ~ 39 MB => 23 MB EXPORT PERFORMANCE 24

25. HepMCAnalysis automated testing MCPlots functionality extension GDML ROOT export interface CONCLUSION 25