1. Muon PRS meeting January 21 st, 2003 Norbert Neumeister CERN EP / HEPHY Vienna Muon Barrel Geometry Description

2. Muon PRS meeting, CERN, 21st January 2003 Norbert Neumeister HEPHY Vienna 2 Introduction We are going to move to XML and DDD –I had a look at the current geometry description –the return yoke is already built, so cross-check with reality! –barrel geometry is more complicated than endcap geometry New Geometry project: –Geometry/Muon/ –MuonGeometry, MuonSensDet, SimulationData, ReconstructionData Simulation – Reconstruction geometry –active geometry (chambers) –passive geometry (return yoke, iron, coil)  needed for propagation –magnetic field geometry  NEW –for simulation we use active and passive geometry –for reconstruction we use only active geometry (only for GEANE propagation the full geometry is used) Geometry description: –muon.tz mb.tz, me.tz, xml files, engineering drawings (AutoCAD) –describes: coil, return yoke, tail catcher, support structure, chambers –structure is not very complicated –XML files are readable (understandable)

3. Muon PRS meeting, CERN, 21st January 2003 Norbert Neumeister HEPHY Vienna 3 Reality vs. Simulation

4. Muon PRS meeting, CERN, 21st January 2003 Norbert Neumeister HEPHY Vienna 4 Details

5. Muon PRS meeting, CERN, 21st January 2003 Norbert Neumeister HEPHY Vienna 5 Details

6. Muon PRS meeting, CERN, 21st January 2003 Norbert Neumeister HEPHY Vienna 6 MUON/MB MCXXcentral wheel MBXX 4 non-central wheels MBXCcables on top of detector MBCA_x_MB (x = 1-24) cables G4 box (non sensitive) MCXX RB1 M_Steel-008 G4Trap RB11 M_Thick_Steel-008 G4Trap RB2 M_Steel-008 G4Trap RB22 M_Thick_Steel-008 G4Trap RB3 M_Steel-008 G4Trap RB33 M_Thick_Steel-008 G4Trap MYBL_x_MCXX (x = 1-36) G4Box M_Steel-008 MBATtail catcher G4Box Copper MBIC MBBTHB0 in front of first muon station G4Box M_B_Air Structure return yoke MCXX MBXX this structure can not be used if the chimneys are included!

7. Muon PRS meeting, CERN, 21st January 2003 Norbert Neumeister HEPHY Vienna 7 Central Wheel MCXX/RB3 simple trapezoids MCXX/ MYBL_x_MCXX simple boxes MCXX/MBAT simple boxes

8. Muon PRS meeting, CERN, 21st January 2003 Norbert Neumeister HEPHY Vienna 8 Central Wheel same material?

9. Muon PRS meeting, CERN, 21st January 2003 Norbert Neumeister HEPHY Vienna 9 AutoCAD

10. Muon PRS meeting, CERN, 21st January 2003 Norbert Neumeister HEPHY Vienna 10 Yoke – Basic Shapes same material? reality geometry description 4 3 2 1 1 2 trapezoids + boxes

11. Muon PRS meeting, CERN, 21st January 2003 Norbert Neumeister HEPHY Vienna 11 Central Wheel with Chambers

12. Muon PRS meeting, CERN, 21st January 2003 Norbert Neumeister HEPHY Vienna 12 Chambers Muon/MB/MCXX Muon/MB/MBXX MB1S 12 chambers of station 1 MB2S 12 chambers of station 2 MB3S 12 chambers of station 3 MB4S 6 chambers of station 4 MB5S 2 large chambers on top of station 4 MB6S 2 small chambers at bottom of station 4 MB7S 2 large chambers at bottom of station 4 …”chamber envelops”

13. Muon PRS meeting, CERN, 21st January 2003 Norbert Neumeister HEPHY Vienna 13 Central Wheel with Chambers MB7S MB6S MB5S MB3S MB1S MB2S MB4S

14. Muon PRS meeting, CERN, 21st January 2003 Norbert Neumeister HEPHY Vienna 14 MBCA_4_MB Central Wheel

15. Muon PRS meeting, CERN, 21st January 2003 Norbert Neumeister HEPHY Vienna 15 Central Wheel

16. Muon PRS meeting, CERN, 21st January 2003 Norbert Neumeister HEPHY Vienna 16 Details

17. Muon PRS meeting, CERN, 21st January 2003 Norbert Neumeister HEPHY Vienna 17 Problems should be a trapezoid and not a box! position of chambers non-magnetic material!

18. Muon PRS meeting, CERN, 21st January 2003 Norbert Neumeister HEPHY Vienna 18 AutoCAD missing!

19. Muon PRS meeting, CERN, 21st January 2003 Norbert Neumeister HEPHY Vienna 19 Problems

20. Muon PRS meeting, CERN, 21st January 2003 Norbert Neumeister HEPHY Vienna 20 Chamber Structure MB1S MHB1 MHC1 honeycomb structure MHAA_2_MHB2 electronics minicrates MHAA_3_MHB2 electronics minicrates MHAA_1_MHB2 electronics minicrates MHAA_4_MHB2 electronics minicrates MB1X outer 2 Z layers MB1Z inner 2 Z layers MB1R outer 2 R layers MB1Y inner 2 R layers MB1K ????? MB1L aluminum plates RP1Iinner RPC RP1Oouter RPC

21. Muon PRS meeting, CERN, 21st January 2003 Norbert Neumeister HEPHY Vienna 21 Chambers

22. Muon PRS meeting, CERN, 21st January 2003 Norbert Neumeister HEPHY Vienna 22 drift cell 2-4 m 30 cm 2 x 4 layers „bending“  Superlayer 4 layers „non-bending“  Superlayer honeycomb layer Position for minicrate (front-end, trigger electronics) B ~ 1 T 12 Layers per DT: 4 z, 8 (r,  ) wire pitch 4.2 cm DT Chambers

23. Muon PRS meeting, CERN, 21st January 2003 Norbert Neumeister HEPHY Vienna 23 AutoCAD

24. Muon PRS meeting, CERN, 21st January 2003 Norbert Neumeister HEPHY Vienna 24 Summary XML files: malg.xml, mb.xml, me.xml –for the time being just a copy of the tz-files –chimneys are not included! –at least we should check if there are any major problems Responsibilities –barrel ??? –endcaps ??? –coil, infrastructure ??? –we need at least one contact person! Work to be done –check position of chambers –check materials and shapes –fix known problems: yoke geometry, (coil?) –create magnetic field geometry (Valery Andreev)