1. BES Ⅲ Detector Description and Event Display Zhengyun YOU, Yajun Mao School of Physics, Peking University Jan.10th, 2006

2. Outline What is XML; BES Ⅲ Detector Description based on XML(GDML); What is Detector Description; Why we need Event Display; BES Ⅲ Event Display Software -- BesVis; Highlights in BesVis; Part Ⅰ Part Ⅱ

3. Part Ⅰ Detector Description

4. Detector Description in BESIII Offline Software GEANT4GAUDIROOT BOOST BOSS Detector related information geometry, material, structure… Event Generator Detector Simulation Reconstruction Physics Analysis Event Display

5.  XML (eXtensible Markup Language) is an industry standard tool.  XML has great power in auto-distribution and data exchange over platforms. XML document Same content Different format standard auto What’s XML?

6. A Simple Example With XML <volume name=“logLayer” solid=“layer” material=“iron” airiron

7. BES Ⅲ Detector Mdc Tof Emc Muc Others Magnet, Beam Pipe...

8. BES Ⅲ Sub-detectors by XML Mdc (18,324 Nodes) Muc (16,071 Nodes) Emc (12,806 Nodes) Tof (643 Nodes)

9. BES Ⅲ Detector Description based on GDML Geometry, Materials, Alignment… Classes for Simulation GDML description Classes for Reconstruction Classes for Event Display ROOT Schema GDML writer GEANT4 Schema  GDML (Geometry Description Markup Language) is a kind of XML, developed by GEANT4 group.  We expand its GEANT4 Schema and developed a new ROOT Schema for BES Ⅲ applications. Automatically

10. XML document Advantage of Using XML GDML description Simulation Reconstruction Event Display 1. Single source for all applications 3. Data exchange over platforms 2. Auto distribution

11. Part Ⅰ Summary Next stage will focus on Reconstruction in other sub-detectors and alignment; XML Detector Description has been well used in simulation, event display of all sub-detectors and Muc reconstruction;

12. Part Ⅱ Event Display

13. Visual check of sub-detectors Visual check of hits, tracks Improve recon. eff., ghost, mis-ID Propaganda Visual check of hits-track association Why we need Event Display

14. Object Oriented, C++, based on ROOT and GDML, independent of BOSS; Start from Oct, 2005; First version released; Developed by Peking University; BES Ⅲ Event Display Software -- BesVis

15. BesVis – Friendly User Interface

16. BesVis – Display Mode XY + ZR XY ZR 3D All

17. BesVis – Details Control

18. BesVis – OpenGL and X3D OpenGL X3D

19. BesVis – Lots of Functions Event Detector View Control Hot Keys User favorite style Dst

20. BesVis – Highlights ( Ⅰ ) XML Detector Description : from XML : consistent; from ROOT : fast; A new BES Ⅲ Event Display software, based on investigation of many other experiments : ZEUS, CDF, PHENIX, ATLAS(Fast), Babar, STAR, CMS, LHCb, CLEO, BESII … Newly developed 2D geometry system : + = New nice style :

21. BesVis – Highlights ( Ⅱ ) -- Interactive

22. BesVis – Highlights ( Ⅲ ) -- Animation J/Ψ-> μ + μ -

23. Part Ⅱ Summary New functions to be added : Display of MC truth; Event selection and save; …… Event Display Software has basic functions and could be used;

24. Thank you!

25. BES Ⅲ Sub-detectors by XML Mdc (18,324 Nodes) Muc (16,071 Nodes) Emc (12,806 Nodes) Tof (643 Nodes)

26. BesVis – Highlights ( Ⅲ ) -- Animation J/Ψ-> μ + μ -