1. CHEP-03 UCSD La Jolla124/03/2003 The PERSINT Visualization Program for the ATLAS Experiment D. Pomarède CEA/DSM/DAPNIA/SEDI

2. 2D. Pomarède, CEA/DAPNIA/SEDICHEP 24/03/2003 OUTLINE INTRODUCTION DESIGN GENERAL PRESENTATION APPLICATIONS –VISUALIZATION OF GEOMETRY –EVENT DISPLAY PROSPECTS

3. 3D. Pomarède, CEA/DAPNIA/SEDICHEP 24/03/2003 INTRODUCTION PERSINT (PERSpectively INTeracting) is designed for the three- dimensional representation of objects and for the interfacing to a variety of applications, in a fully interactive way. It has the following features : –3D representation of objects in full volumes or wire frames –Computation of hidden faces –Spatial navigation with real-time displacements –Focal length adjustable at will (from isometry to wide-angle) –Interfaces and access to applications –Maximum interactivity –Documentation

4. 4D. Pomarède, CEA/DAPNIA/SEDICHEP 24/03/2003 INTRODUCTION PERSINT was originally developed as a tool for debug- ging and optimizing the ATLAS Muon pattern recognition and track reconstruction algorithm (MUONBOX) PERSINT is now used routinely for : –Visualization of detector geometries : AMDB (ATLAS Muon DB) AGDD-XML (ATLAS Generic Detect. Description) –Event Display (hits & reconstruction objects) Complex Monte Carlo Events ONLINE EVD in TestBeams –Other : Magnetic field, Level-1 Trigger Logic (Muon), …

5. 5D. Pomarède, CEA/DAPNIA/SEDICHEP 24/03/2003 DESIGN Core in F90 –Usage of Modules, with procedure interfaces –Polymorphism –Recursive functions –Dynamic arrays –Allocate (local memory management) –Pointers –String operations –Array manipulations –Free source forms

6. 6D. Pomarède, CEA/DAPNIA/SEDICHEP 24/03/2003 DESIGN GRAPHICS Interface : HIGZ In general, use of CERNLIBS 26000 lines of code Part of the Saclay Muon Software suite, and as such interfaced directly to : –AMDBSIMREC (geometry database) 13000 lines –BFIELDDTB (magnetic field database) 3500 lines –MUONBOX (track reconstruction) 58000 lines

7. 7D. Pomarède, CEA/DAPNIA/SEDICHEP 24/03/2003 DESIGN Highly modular, organized in patches –e.g. XML section Computation of volumes, hidden faces –based on analytical computation of facets’ edges –Highlight intersections, detect clashes –Boolean operations Lighting intensity effects on volume facets Designed to operate in standalone mode, keeping the possibility of integration in frameworks

8. 8D. Pomarède, CEA/DAPNIA/SEDICHEP 24/03/2003 PRESENTATION OF THE PROGRAM General layout Navigation Perspective Event Display of complex Monte Carlo events Online Event Display Interface to AGDD-XML Interface to Level-1 Trigger Interface to Magnetic Field

9. 9D. Pomarède, CEA/DAPNIA/SEDICHEP 24/03/2003 GENERAL LAYOUT COMMAND WINDOW NAVIGATOR DISPLAY WINDOW

10. 10D. Pomarède, CEA/DAPNIA/SEDICHEP 24/03/2003 THE NAVIGATOR MIDDLE-CLICK : GET ONLINE HELP LEFT CLICK : DEFINE MOVEMENTS INVOKE INTERFACES TO APPLICATIONS INVOKE INTERFACES AMDB AGDD-XML EVD DISPLACE VIEWER/ VIEWED POINTS FOCAL LENGTH PROJECTIVE VIEWS SWITCH WIRE/FULL VOLUMES

11. 11D. Pomarède, CEA/DAPNIA/SEDICHEP 24/03/2003 NAVIGATION Two options : –use the navigator (step-by-step movements) –real-time continuous displacements move up move down move right move left move in move out Drag cursor : Left button pressed down for rotation Middle button pressed down for forward/backward displacements

12. 12D. Pomarède, CEA/DAPNIA/SEDICHEP 24/03/2003 FOCAL LENGTH Normal view : 35 mm

13. 13D. Pomarède, CEA/DAPNIA/SEDICHEP 24/03/2003 FOCAL LENGTH Infinite F.L. (isometric view)

14. 14D. Pomarède, CEA/DAPNIA/SEDICHEP 24/03/2003 FOCAL LENGTH Wide angle (few mm F.L.)

15. 15D. Pomarède, CEA/DAPNIA/SEDICHEP 24/03/2003 FOCAL LENGTH Projections X-view Z-view Also available :  -view, Y-view, real-time lateral displacements

16. 16D. Pomarède, CEA/DAPNIA/SEDICHEP 24/03/2003 EVENT DISPLAY OF MONTE CARLO DATA Example of event from ATLAS Data Challenge 1, single-muon with high lumi pile-up, safety factor 5 on cavern component. Interactive track reconstruction (MUONBOX).

17. 17D. Pomarède, CEA/DAPNIA/SEDICHEP 24/03/2003 EVENT DISPLAY OF MONTE CARLO DATA

18. 18D. Pomarède, CEA/DAPNIA/SEDICHEP 24/03/2003 EVENT DISPLAY OF MONTE CARLO DATA Example of event from ATLAS Data Challenge 1, single-muon with high lumi pile-up, safety factor 5 on cavern component. Interactive track reconstruction (MUONBOX).

19. 19D. Pomarède, CEA/DAPNIA/SEDICHEP 24/03/2003 EVENT DISPLAY OF MONTE CARLO DATA

20. 20D. Pomarède, CEA/DAPNIA/SEDICHEP 24/03/2003 ONLINE EVENT DISPLAY H8-2002 Muon Testbeam : 6 Barrel chambers + 5 Endcap chambers Implementation in the online software using the Monitoring Factory Proved useful in commissioning of detectors and understanding of events GEthFEth PC ROS 1 GEthFEth PC ROS 2 GEth FEth GEth SFISFO PC Swi tch PERSINT reads the Event at the SFI level… …and displays it

21. 21D. Pomarède, CEA/DAPNIA/SEDICHEP 24/03/2003 INTERFACE TO AGDD-XML Example : description of dead matter (used by MUONBOX for M.S.,…) Display of event hits : generic usage (Inner Trackers, Calorimeters, …) Supports all Boolean operations

22. 22D. Pomarède, CEA/DAPNIA/SEDICHEP 24/03/2003 BOOLEAN VOLUME OPERATIONS PERSINT supports boolean volume ope- rations Three basic operations: –Addition –Subtraction –Intersection This allows the creation of very complex 3D objects from simple ones

23. 23D. Pomarède, CEA/DAPNIA/SEDICHEP 24/03/2003 INTERFACE TO LEVEL-1 TRIGGER Visualization of L1 Trigger objects : RoI, PAD Logic, Coinci- dence Windows, supervision of Coincidence Matrices, … Example : Higgs to four muons event

24. 24D. Pomarède, CEA/DAPNIA/SEDICHEP 24/03/2003 INTERFACE TO MAGNETIC FIELD Dedicated Interface for : Visualization of the magnetic field map 2D or 3D lattice Visualization of magnet elements

25. 25D. Pomarède, CEA/DAPNIA/SEDICHEP 24/03/2003 PERFORMANCES Navigation with full volumes –On a 2.8 GHz Pentium 4 –0.65 sec to compute and display 2300 volumes / 15000 facets of the Muon precision chambers system –Real-time displacements are fluid (> 10 views per second) for a number of volumes < 400 Event Scan on Testbeam Data –Display events in loop with 6 MDT chambers and ~ 20 hits –0.02 sec/event for bare event display –0.20 sec/event with track reconstruction

26. 26D. Pomarède, CEA/DAPNIA/SEDICHEP 24/03/2003 AVAILABILITY OF THE CODE PERSINT Web Page –http://cern.ch/Atlas/GROUPS/MUON/persint.html AFS Location –/afs/cern.ch/atlas/offline/external/Persint Documentation updated with every release

27. 27D. Pomarède, CEA/DAPNIA/SEDICHEP 24/03/2003 PROSPECTS DISCUSSION ON THE DESIGN –ADVANTAGES : User can download a single executable binary; no dll, no fancy APIs to install; Efficient even if operated remotely (e.g on remote clusters from a X-terminal) –DISADVANTAGES : Limited graphics interface (256 colors, …) Does not profit from high performance capabilities of graphics cards when operated locally on PCs (Z-buffer).

28. 28D. Pomarède, CEA/DAPNIA/SEDICHEP 24/03/2003 PROSPECTS Planned developments : –Integration in the ATHENA reco/analysis framework => useful to debug events –Possibility to launch EVD from the ASK Interactive toolkit –Migration to OpenGL ? –Integrate some parts in ROOT (calculus of hidden faces, intersecting volumes, …) ?

29. 29D. Pomarède, CEA/DAPNIA/SEDICHEP 24/03/2003 PROSPECTS Planned utilization : –Online EVD in the H8-2003 Muon Testbeam –Online EVD in the H8-2004 Combined Testbeam –Commissioning of ATLAS : participation in the debug of the detector (cosmics runs, calibration runs, …) –ATLAS Online EVD for monitoring of data-taking