1. Muon Meeting April 2004JsG Status of Chambers Production at CERN Jean-Sebastien Graulich o Open Questions from the PRR O-ring Aging, Aging tests, Storage oWhat we have learnt from production of M3R1 Production Rate, Schedule and Flow Quality Control Problems met o What we plan for production of M3R2 Todo List Supplies Forecasts o Conclusions

2. Muon Meeting April 2004JsGSlide 2 From PRR… “The long term stability of the O-ring material is not yet fully documented in our view. This ought to be done before the final closing of the chambers.” Optical Inspection (x50) when stretched : Reference Sample Aged Sample Exposed to gas Not Exposed

3. Muon Meeting April 2004JsGSlide 3 From PRR… “We propose that the ageing studies are vigorously pursued. We furthermore recommend that gas and chamber parameters are well understood and monitored throughout these tests to provide a solid basis for the choice of the final gas mixture and gas distribution system” Ageing studies will start this month.

4. Muon Meeting April 2004JsGSlide 4 From PRR… ““The question of where and how to store the chambers after they are produced, but before they can be installed at the experiment, ought to be revisited.” Should be solved this month.

5. Muon Meeting April 2004JsGSlide 5  Nominal Production Rate: 1 Chamber/week  The time needed for the glue to dry drives the production time  We avoid having 2 people working on the same panel on the same day It takes ~2.5 weeks to produce 1 Wired panel => We have to work on 6 wired panels in parallel (3 ch) It takes 4 days to produce 1 central/outer panel => We can work with only 3 simple panels in parallel (1 ch)  There is a long lag between delivery of panels and the first assembled chamber. M3R1 Production Rate

6. Muon Meeting April 2004JsGSlide 6 M3R1 Production Flow

7. Muon Meeting April 2004JsGSlide 7 M3R1 Production Schedule

8. Muon Meeting April 2004JsGSlide 8 M3R1 Production Limits  Limitations on production rate Manpower 80 % is a absolute maximum because of meetings, other duties and trouble shooting. We are close to the limit but still ok Machines Bars gluing machine is in use 4/5 days Winding machine can be freed 2/5 days if we glue the wires elsewhere We have large margins everywhere but for the BGM Storage Place No problem for region 1, we can store more than 30 panels in work (6 chambers) For region 2, it’s only 16 (3 chambers)

9. Muon Meeting April 2004JsGSlide 9  Some problems we have met… (and how we solved them) HV training 2 different behaviors (6 long training/60 gaps) Sparks (1/60 gaps) Broken components (1/2500 capacitors, 0 resistors) Wiring Pitch out of specification (during training period only) Guard wire fixation (during training period only) Problems due to holes in the combs (solved) Bars Gluing Detaching bars (1/60 gaps) Gluing mistake (1/60 gaps) Broken Wires  Only 1 panel has been lost (over 30) M3R1 Production Problems

10. Muon Meeting April 2004JsGSlide 10 M3R1 Quality Control  Half Gap Reference points Min 95 % into [2.45, 2.55] mm, all points into [2.42, 2.58] mm Min 95 % into [2.45, 2.55] mm, all points into [2.42, 2.58] mm

11. Muon Meeting April 2004JsGSlide 11 M3R1 Quality Control  Pitch Measurement Min 95 % into [1.95, 2.05] mm, all points into [1.90, 2.10] mm Min 95 % into [1.95, 2.05] mm, all points into [1.90, 2.10] mm

12. Muon Meeting April 2004JsGSlide 12 M3R1 Quality Control  Wire Tension Measurement All tension higher than 50 g, Max deviation < 0.1 T 0 All tension higher than 50 g, Max deviation < 0.1 T 0

13. Muon Meeting April 2004JsGSlide 13 M3R1 Quality Control  Chamber Thickness: Envelope = 75 mm

14. Muon Meeting April 2004JsGSlide 14 M3R1 Quality Control  Leak rate: < 2 mbar/hour (@? mbar  P) Measured with a reference volume in a thermally isolated box T Ch  T Ref  Constant dV/V  d (  P Ch -  P Ref )/P Ch Absolute Error on P atm cancels out

15. Muon Meeting April 2004JsGSlide 15 M3R1 Quality Control  Gas gain uniformity Still under development Pad 1 Pad 2 Pad 3 Etc.. delay +20ns TDC QDC All Anodes Delay Line Am Source spectrum @ 2.65 kV

16. Muon Meeting April 2004JsGSlide 16 M3R1 Quality Control  High rate capabilities At least all region 1 chambers will be exposed to GIF for 1 day.

17. Muon Meeting April 2004JsGSlide 17  PCB’s are ordered since Feb 24. They should be sent for foam injection this week.  A first batch of panels should be at CERN on Apr 26, and the rest in May  In the Meanwhile: Upgrade of toolings New frame for bars gluing New axis for Wire Winding New drilling calibre New Connector Soldering calibre New box for panel HV test New insulated box for leak test Preparation of panel protections Workspace optimization General Maintenance Travelers M3R2 Production

18. Muon Meeting April 2004JsGSlide 18 M3R2 Parts Wire fixation and side bars: 30+30+60 Apr 26 Wire (30 microns) ~20 km Apr 23 Guard Wire (100 microns) 120 m In stock Connectors (17-pins, 4.2 mm) 1680Ordered HV Capacitors 5760Ordered HV Resistors 100k  5760Ordered HV Wires 120 To be cut O-ring pins 960 In stock Gas inlets 120 In stock Kapton Strips 120 To be cut  Panel Production

19. Muon Meeting April 2004JsGSlide 19 M3R2 Parts Gap Spacers 2640Ready O-rings120 Being cleaned Mechanical Frame fixation screws 1320 In Stock at CERN Mechanical Frame fixation threaded rods 660Ready Mechanical alodinized Frame bars 120+120 To be ordered  Chamber Assembly

20. Muon Meeting April 2004JsGSlide 20 M3R2 Consumables Bars gluing Syringes ( 30 ml) 120Ready gluing needles (large, brown) 120Ready Bars gluing syringe stoppers (large) 120Ready Wires gluing Syringes ( ml) 120Ready Wires gluing needle (medium, pink) 120Ready Wires gluing syringe stoppers (small) 120Ready Glue mixers 480Ready Glue Adekit 145 NR 120Ready Glue Adekit 140 30Ready Gloves, masks, hats, etc Many In stock at CERN

21. Muon Meeting April 2004JsGSlide 21 M3R2 Production  Compare to M3R1 ; # wires is doubled =>Double time for winding, soldering, PWTM, wire cutting and inspection ; Length is doubled => 30% more gluing time ; Area is doubled => Double panel cleaning time ; 80% more holes => 80% more drilling time 20% more assembly time ( Single cathode RO => No soldering nor electrical tests on Simple panels ( Same # wire pads =>Same components soldering time ( Other procedures are not affected  All in all, ~30 % more time  Can be absorbed by the team.

22. Muon Meeting April 2004JsGSlide 22 M3R2 Production plan  First M3R2 Chamber on May 21st  27 Chambers on November 30st

23. Muon Meeting April 2004JsGSlide 23 Conclusions  M3R1 Production finished on schedule The crew is now well trained Gap, Pitch, Wire Tension, Thickness, Leak rate and HV specifications are all met Gas gain uniformity and High rate tests are still under development  M3R2 Production is in the starting blocks Panels must arrive before May 5 First chamber expected for May 21 Supply of parts and consumables is under control  Production bottlenecks are Man power Bars gluing Storage