1. UPDATE ON CMS RESISTIVE PLATE CHAMBERS CMS RPC Barrel Collaboration GR1, 5 Aprile 2004

2. INFN Gruppo I Roma, 5 April 2004 Introduction CMS RPC group GT HT Bari Pavia Introduction Sofia All the sites are in operation CERN Gap production on schedule Chamber production delayed by 2.5 months GIF activity is going on. Stop in June?

3. SG production INFN Gruppo I Roma, 5 April 2004 Single/Double Gap Production and QC CMS RPC group

4. SG production INFN Gruppo I Roma, 5 April 2004 Single/Double Gap Production and QC CMS RPC group

5. DG production INFN Gruppo I Roma, 5 April 2004 Single/Double Gap Production and QC CMS RPC group

6. SG/DG production INFN Gruppo I Roma, 5 April 2004 Single/Double Gap Production and QC CMS RPC group Overview on the full production # 1629 SG produced until 20 March 2004 overall rejection factor 17 % # 457 DG produced until 20 March 2004 overall rejection factor 3.5 % 2004 production Single gap rejection factor 10.7% ==> 70.2% overpressure test 10.6 % other 19.2 % high current

7. Chamber production INFN Gruppo I Roma, 5 April 2004 Chamber production CMS RPC group

8. Gas circuit “T junction” INFN Gruppo I Roma, 5 April 2004 Chamber production CMS RPC group Some “T” on the gas circuit supplying the small gaps in the GIF were attached by the HF. These “T” are made by poly-acetylic resins These components are used in the chamber gas circuit. However an inspection of the components present inside the RB1s in operation in the GIF has not showed any damage The use of moistly mixtures can accelerate the deterioration

9. Gas circuit “T junction” INFN Gruppo I Roma, 5 April 2004 Chamber production CMS RPC group Produce a “custom T junction” in polycarbonate A flux reducer has also been produced. It is needed to equalize the flux between the two gaps of a layer

10. Gas circuit “T junction” INFN Gruppo I Roma, 5 April 2004 Chamber production CMS RPC group Pre-production of the new “T junction” ready Full production at the end of the month Total cost about 20 k € Polycarbonate is extensively used inside the gap ( spacers, sealing frame)

11. Chamber assembly - HT INFN Gruppo I Roma, 5 April 2004 Chamber production CMS RPC group HT in operation: # 46 chamber produced

12. Chamber test - Pavia INFN Gruppo I Roma, 5 April 2004 Chamber test CMS RPC group In operation since October 2003. # 27 RB1s tested Two kinds of trigger (small/ big) Transport logistic: the same track from Pavia > CERN >Naples> Pavia One week trip In operation since October 2003. # 27 RB1s tested Two kinds of trigger (small/ big) Transport logistic: the same track from Pavia > CERN >Naples> Pavia One week trip More information available at:: http://lxpv01.pv.infn.it/~torre/testrpc/fatherframe.html More information available at:: http://lxpv01.pv.infn.it/~torre/testrpc/fatherframe.html

13. Chamber test - Pavia INFN Gruppo I Roma, 5 April 2004 Chamber test CMS RPC group

14. Chamber test - Pavia INFN Gruppo I Roma, 5 April 2004 Chamber test CMS RPC group Trigger SMALL RPC

15. Chamber test - Pavia INFN Gruppo I Roma, 5 April 2004 Chamber test CMS RPC group RPC Trigger BIG

16. Chamber test - Results INFN Gruppo I Roma, 5 April 2004 Chamber test CMS RPC group

17. Chamber test - Results INFN Gruppo I Roma, 5 April 2004 Chamber test CMS RPC group

18. Chamber test - Results INFN Gruppo I Roma, 5 April 2004 Chamber test CMS RPC group Distribuzione di Mean Cluster Size Distribuzione di Mean Cluster Size (muon)

19. ISR test activity INFN Gruppo I Roma, 5 April 2004 ISR test activity CMS RPC group Tests at ISR is increasingly requiring dedicated resources and manpower A test trolley with 30 gas lines and 22 HV lines is in operation at CERN ISR 15 chambers can be fully read-out A self trigger electronics will be soon installed to test cosmic rays performance The gas system can provide up to 200 l/h flux with controlled humidity

20. ISR test activity INFN Gruppo I Roma, 5 April 2004 ISR test activity CMS RPC group 86 chamber are at ISR on special stoking trolleys 49 chambers have been tested: 44 accepted - 5 rejected

21. ISR test activity INFN Gruppo I Roma, 5 April 2004 ISR test activity CMS RPC group CH 102 Monitor the current stability vs time a)Chamber with current/layer > 16  A are rejected b) Chamber with a steady increasing of current are rejected

22. ISR test activity INFN Gruppo I Roma, 5 April 2004 ISR test activity CMS RPC group Monitor the current stability vs time 10 Chambers under test: LAYER UP10 Chambers under test: LAYER DOWN 9.2 KV

23. ISR test activity INFN Gruppo I Roma, 5 April 2004 ISR test activity CMS RPC group up Down -total Current@9400 V Cluster_size@9400 V Random trigger, 44 chambers Forw Back Middle -total

24. ISR test activity INFN Gruppo I Roma, 5 April 2004 ISR test activity CMS RPC group Average noise rate by cluster counting@9400V Forw Back Middle -total Random trigger, 44 chambers

25. ISR test activity INFN Gruppo I Roma, 5 April 2004 ISR test activity CMS RPC group BWFWBWFWBW RPC under test Trigger RPC To TDCs To TDCs and Trig. logic To TDCs and Trig. logic RPC-based TRIGGER System at ISR

26. ISR test activity INFN Gruppo I Roma, 5 April 2004 ISR test activity CMS RPC group The 8 modules are interconnected with I 2 C bus driven by the Slow Control Board The 8 modules are interconnected with I 2 C bus driven by the Slow Control Board NIM Module Reads 6 FEB (1 bi-gap) I 2 C bus OR of 96 strips on NIM and LVDS Mask noisy channels 8 LVDS input OR Majority level selectable on the front panel NIM Trigger output NIM Veto input NIM Module Reads 6 FEB (1 bi-gap) I 2 C bus OR of 96 strips on NIM and LVDS Mask noisy channels 8 LVDS input OR Majority level selectable on the front panel NIM Trigger output NIM Veto input

27. Production schedule INFN Gruppo I Roma, 5 April 2004 Production schedule CMS RPC group

28. Production schedule INFN Gruppo I Roma, 5 April 2004 Production schedule CMS RPC group

29. Production schedule INFN Gruppo I Roma, 5 April 2004 Production schedule CMS RPC group

30. Production schedule INFN Gruppo I Roma, 5 April 2004 Production schedule CMS RPC group

31. Production schedule INFN Gruppo I Roma, 5 April 2004 Production schedule CMS RPC group

32. Production schedule INFN Gruppo I Roma, 5 April 2004 Production schedule CMS RPC group

33. GIF INFN Gruppo I Roma, 5 April 2004 GIF CMS RPC group Exchange rate: 1 volume/h Humidity: ~50% July 29 th, 2003: start of operation at 50% recirculation November 4 th, 2003: start of operation at 90% recirculation December 16 th, 2004: start of operation at 95% recirculation understand the quality of the gas mixture detect possible pollutants produced in the chambers ascertain the efficacy of the filters Exchange rate: 1 volume/h Humidity: ~50% July 29 th, 2003: start of operation at 50% recirculation November 4 th, 2003: start of operation at 90% recirculation December 16 th, 2004: start of operation at 95% recirculation understand the quality of the gas mixture detect possible pollutants produced in the chambers ascertain the efficacy of the filters 3 filters used to trap HF: molecular sieve, 50% Copper, Nichel

34. GIF INFN Gruppo I Roma, 5 April 2004 GIF CMS RPC group  Gas Chromatograph Allows an immediate feedback on the gas, but low sensitivity About 30 “useful” samples taken  Gas Chromatograph Allows an immediate feedback on the gas, but low sensitivity About 30 “useful” samples taken “CERN” analysis A complex (takes much care) and long (about 8 hours in total) procedure to take samples; good sample quality, high sensitivity (up to 5  g/l), results after some time “CERN” analysis A complex (takes much care) and long (about 8 hours in total) procedure to take samples; good sample quality, high sensitivity (up to 5  g/l), results after some time Custom analysis Use the same procedure to take samples, allows a good (equally or more precise, i.e. ~ 0.1 p.p.m) cross check of the results of the previous method Custom analysis Use the same procedure to take samples, allows a good (equally or more precise, i.e. ~ 0.1 p.p.m) cross check of the results of the previous method

35. GIF INFN Gruppo I Roma, 5 April 2004 GIF CMS RPC group

36. Conclusion INFN Gruppo I Roma, 5 April 2004 Conclusion CMS RPC group Review and freeze the installation schedule with the DT group in Aachen (end April) (any change is expecially harmfull for RPC) Boost the chamber test rate in Bari and Pavia Open “SX5 commisioning” front Continue up to end June GIF activity. Then probably concentrate on ISR and SX5 Review in May the budget situation Review and freeze the installation schedule with the DT group in Aachen (end April) (any change is expecially harmfull for RPC) Boost the chamber test rate in Bari and Pavia Open “SX5 commisioning” front Continue up to end June GIF activity. Then probably concentrate on ISR and SX5 Review in May the budget situation “Si sta come le foglie sugli alberi di autunno” Non scuotete troppo l’albero, e speriamo che arrivi presto la primavera “Si sta come le foglie sugli alberi di autunno” Non scuotete troppo l’albero, e speriamo che arrivi presto la primavera