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1. GAS

1. GAS. S.Bianco Colafranceschi Benussi Piccolo, …. 2. SENSORS4UPGRADE S.Bianco S.Buontempo Caponero Breglio…, …. Stefano Bianco per CMS Frascati. GAS. Gas review al cern sull’incident della rottura del flussimetro SF6 (0.30% --> 0.39%) piuttosto produttiva:

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1. GAS

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  1. 1. GAS S.Bianco Colafranceschi Benussi Piccolo, … 2. SENSORS4UPGRADE S.Bianco S.Buontempo Caponero Breglio…, … Stefano Bianco per CMS Frascati s.bianco (frascati) CMS RPC Italia 12 maggio

  2. GAS • Gas review al cern sull’incident della rottura del flussimetro SF6 (0.30% --> 0.39%) piuttosto produttiva: https://indico.cern.ch/conferenceDisplay.py?confId=137611 e minute di Pigi s.bianco (frascati) CMS RPC Italia 12 maggio

  3. SF6 Mass Flow Controller – follow-up 15/4 possible problem concerning the RPC gas mixture composition reported the SF6 mass flow controller (MFC). MFC changed (19:30) and to start preparing the gas chromatograph (GC). 17/4 17:00 after discussion with RPC group, I put back the old MFC Analyses results: the old MFC is delivering about 30% more SF6 with respect the new. SF6 C2H2F4 iC4H10 s.bianco (frascati) CMS RPC Italia 12 maggio

  4. SF6 Mass Flow Controller 18/4 20:00 New MFC again in use 19/4 New analysis confirmed the 34% difference between the two MFCs (i.e. 0.4 % instead of 0.3 % of SF6 in the mixture). 20/4 21:50 SF6 concentration in the return mixture from the detector: 0.325% old MFC verified on the our Bronkhorst calibration stand: 35% difference in the output flow confirmed. 21/4 12:00 SF6 concentration in the return mixture from the detector: 0.323% 21:00 SF6 concentration in the return mixture from the detector: 0.322% 25/4 21:00 SF6 concentration in the return mixture from the detector: 0.314% 3/5 Old MFC reinstalled after recalibration 21:00 SF6 concentration in the return mixture from the detector: 0.312% Regular analysis (1-2 per week  Beatrice) will be performed until when the CMS GC will be fully operational s.bianco (frascati) CMS RPC Italia 12 maggio

  5. GGM on wrong mix problem The GGM HV scan confirms shift of WP due to wrong mix In progress analysis of charge ratios timeline to spot (wrongMix->goodMix) transition which should have occurred delayed in clean and (after/before) gas mixtures. A small transient effect possible. s.bianco (frascati) CMS RPC Italia 12 maggio

  6. PRELIMINARY GGM down :-(((( +-10% 0.39%-->0.30% SF6 0.30%-->0.39% SF6 APRIL 2011 HV scans s.bianco (frascati) CMS RPC Italia 12 maggio

  7. 0.30%-->0.39% SF6 0.30%-->0.39% SF6 0.39%-->0.30% SF6 s.bianco (frascati) CMS RPC Italia 12 maggio

  8. ADC s.bianco (frascati) CMS RPC Italia 12 maggio

  9. ADC s.bianco (frascati) CMS RPC Italia 12 maggio

  10. CONCLUSIONS 0/3 Il gas group effettuera’ misure di GC con il sistema CMS in USC 1/2 volte a settimana (Beatrice) Il GC INFN verra’ installato in SGX5 e operato da RPC s.bianco (frascati) CMS RPC Italia 12 maggio

  11. CONCLUSIONS 1/3 • GGM : • Stable operation, performance up to specs. • INFN GC : • Install and operate in SGX5 gas room • Issues: automatize & integrate DCS/PVSS • runs : ~2 days frequency s.bianco (frascati) CMS RPC Italia 12 maggio

  12. CONCLUSIONS 2/3 • The GGM is not designed for detecting overall gas mixture changes • Studies in progress to verify the feasibility of detecting gas mixture changes via the transient in the charge ratios. Small effects. • We propose to widen the scope and performance of GGM in order to provide an additional mean of monitoring for the RPC gas mixture • GGM+ : • HV feedback. Change HV supply to gaps as a function of p and T. Monitor charge and ratios • PVSS changes including PVSS integration… 0.5 month • Unix data analysis… 1.5 month • Commissioning and debugging…….. 0.75 month • Value added: Gain experience for a CMS RPC feedback • HV scans. Every 10 days • PVSS changes …0.5 month • Auto scan tool C++/ROOT … 2.0 months • XDAQ changes… 0.5 month • Commissioning and debugging 0.5 month • Need 6.5 months support for a Frascati engineer (R.Aurilio or C.Vendittozzi). s.bianco (frascati) CMS RPC Italia 12 maggio

  13. CONCLUSIONS 3/3 • Abbiamo trovato e capito alcuni GGM analysis bugs • Il transiente si vede • A Frascati stiamo facendo HVSCAN con twin GGM • SF6 = 0.30/0.39/0.33/0.30/0.25 • Circa altri 10 giorni • A CERN abbiamo iniziato serie di HV scan con GGM per studiare sistematica e alternative al fit con la sigmoide s.bianco (frascati) CMS RPC Italia 12 maggio

  14. TASKS & RICHIESTE • Install INFN GC and operate in SGX5 • 1 mese … Beatrice (PV) oppure Vendittozzi (Frascati) • GGM+ • 6.5 mesi … Vendittozzi (Frascati) o Aurilio (Frascati) o ??? Altra risorsa RPC (Pakistan/India etc) s.bianco (frascati) CMS RPC Italia 12 maggio

  15. POSSIBILE RI-ORGANIZZAZIONE GAS • GAS () • Gas quality …. GC () • Gas calibration ….GGM (Frascati) • Liason to gas group (Benussi) • Detector (leak tests + ???) () s.bianco (frascati) CMS RPC Italia 12 maggio

  16. SENSORS4RPCFrascati + Napoli • Installare sensori ottici FBG per temperatura camere endcaps nuove +esistenti • 2013 ma vogliamo iniziare a comprare, certificare, saldare sensori al polipo ASAP • Oggi distribuito primo draft di specifiche tecniche gara • Next: riunioni frascati/napoli • Lab Frascati pronto per test accettazione, Napoli anche disponibile s.bianco (frascati) CMS RPC Italia 12 maggio

  17. SPARE SLIDES s.bianco (frascati) CMS RPC Italia 12 maggio

  18. RPC GAS MONITORING • Gas Gain Monitoring (GGM) • Monitoring of working point for changes due to differences among clean, after-purifiers, before-purifiers gas mixtures. Monitoring of charge ratios (afterPurifiers/clean, beforePurifiers/clean) allows cancellation of p,T,H effects • Gas Quality Monitoring • Monitoring of chemical composition of gas mixtures s.bianco (frascati) CMS RPC Italia 12 maggio

  19. RPC GAS SYSTEM AND MONITORING Gas quality monitoring GC F- Purifiers pH other GC+others (half wheel pick-up points) Mixer Gas gain monitoring RPCs #1 Fresh gas Humidifier RPCs #2 Before purifiers CMS RPCs #3 After purifiers SGX5 UXC55 USC55 DAQ Performance detector monitoring - ENV. CONTROL gas parameters Ambient parameters s.bianco (frascati) CMS RPC Italia 12 maggio 19

  20. GGM • Eight single gap RPCs with charge readout in a cosmics telescope • Three sets of gaps: clean gas, before-purifier gas, after-purifier gas. Cancellation of p,T by ratioing. • fully integrated in DCS/PVSS • In operation and shift monitoring since 2009 https://twiki.cern.ch/twiki/bin/view/CMS/RPComm s.bianco (frascati) CMS RPC Italia 12 maggio

  21. GGM  s.bianco (frascati) CMS RPC Italia 12 maggio

  22. GGM s.bianco (frascati) CMS RPC Italia 12 maggio

  23. Gas Gain Monitoring Performance Avalanche Streamer 0% SF6 0.3% SF6 Anode charge in avalanche-streamer transition region monitors shifts in working point. SENSITIVITY ~ 20V +-3%rms Coherent effects cancel out due to system redundancy. The two-gap ratio cancels out LONG-TERM ENVIRONMENTAL EFFECTS AT THE +-3% LEVEL s.bianco (frascati) CMS RPC Italia 12 maggio

  24. GGM on PVSS s.bianco (frascati) CMS RPC Italia 12 maggio

  25. GGM TWIN IN FRASCATI CMS LAB T,H controlled hut Gaschromatograph DAQ system +-1% +-0.5 C s.bianco (frascati) CMS RPC Italia 12 maggio

  26. GAS QUALITY MONITORING • Gaschromatograph (GC) with columns optimized for RPC gas mixture components • Purchased in ~2007 by the INFN group and used by CERN gas group so far • Nicely complement to the CMS GC presently operated by the CERN gas group in USC. s.bianco (frascati) CMS RPC Italia 12 maggio

  27. STATUS OF GGM AND GAS QUALITY • GGM • Fully integrated in DCS/PVS • In operation and shift monitoring since 2009 https://twiki.cern.ch/twiki/bin/view/CMS/RPComm • Stable operation • Loss of efficiency in 1 gap, to be replaced • The GGM is performing up to specs • INFN Gaschromatograph • Not periodically used • No procedures for shifter use available yet s.bianco (frascati) CMS RPC Italia 12 maggio

  28. OUTLOOK & GGM+ We propose actions to improve the monitoring of CMS RPC gas mixture: • Review of alarms on gas parameters (see G.Polese’s talk) • Integrate in the gas monitoring the INFN GC located at SGX5 gas room. • GGM+ • p,T correction via HV feedback • HV scans s.bianco (frascati) CMS RPC Italia 12 maggio

  29. GGM HV feedback test with twinsystem in Frascati With p,T correction on HV Without p,T correction on HV s.bianco (frascati) CMS RPC Italia 12 maggio

  30. TYPICAL GGM HV SCAN s.bianco (frascati) CMS RPC Italia 12 maggio

  31. GGM preliminary resultson wrong mix problem April 29th, 2011 - March 3rd, 2011 April 29th, 2011 - January 2010 Good mix Wrong mix Good mix Good mix s.bianco (frascati) CMS RPC Italia 12 maggio

  32. RESOURCES M. Abbrescia et al., Gas analysis and monitoring systems for the RPC detector of CMS at the LHC, 
[physics/0701014] LNF-06-34-P (Jan 2007) 9p. Presented by S.Bianco at the IEEE2006, S.Diego (USA). M.Abbrescia et al., The gas monitoring system for the resistive plate chamber detector of the CMS experiment at LHC.
2008. 4pp. 
18th Hadron Collider Physics Symposium 2007 (HCP 2007) 20-26 May 2007, La Biodola, Isola d'Elba, Italy. 
Published in Nucl.Phys.Proc.Suppl.177-178:293-296,2008. CMS Collaboration, The CMS experiment at the CERN LHC, 2008 JINST 3 508004. L.Benussi et al., Sensitivity and environmental response of the CMS RPC gas gain monitoring system, 
JINST 4:P08006,2009,. [arXiv:0812.1710] L.Benussi et al., The CMS RPC gas gain monitoring system: An Overview and preliminary results. 
Nucl.Instrum.Meth.A602:805-808,2009,. [arXiv:0812.11]. L.Benussi et al, Sensitivity and environmental response of the CMS RPC gas gain monitoring system, LNF-08-27(P), JINST 4:P08006,2009. 
e-Print: arXiv:0812.1710. S.Bianco et al., Chemical study of the CMS RPC closed loop gas system, CMS note 2010 - 007 L.Benussi et al., Study of gas purifiers for the CMS RPC detector. 
[arXiv:1012.5511] (Dec 2010) L.Benussi et al., A New approach in modeling the response of RPC detectors. 
[arXiv:1012.5508] (Dec 2010) 13p. S.Colafranceschi et al., Operational experience of the gas gain monitoring system of the CMS RPC muon detectors. 
Nucl. Instrum. Meth.A617:146-147,2010,. L.Benussi et al., A new approach in modeling the response of RPC detector, presented by S.Colafranceschi at RPC10, Darmstadt, to appear on NIM (2011) G.Saviano (for the CMS RPC Collaboration) Results on chemical analysis in the CMS RPC closed loop, presented at RPC2010, Darmstadt (Germany). To appear on NIM (2011). https://twiki.cern.ch/twiki/bin/view/CMS/RPComm https://twiki.cern.ch/twiki/bin/view/CMS/MuonRpcPrivate s.bianco (frascati) CMS RPC Italia 12 maggio

  33. SPARES s.bianco (frascati) CMS RPC Italia 12 maggio

  34. GGM-related studieson purifiers • Study of RPC purifiers at the scaled-down closed loop system located in the ISR area • Release of contaminants in gas is correlated to currents increase • Results available at • S.Bianco et al., Chemical study of the CMS RPC closed loop gas system, CMS note 2010 - 007 • L.Benussi et al., Study of gas purifiers for the CMS RPC detector. 
[arXiv:1012.5511] (Dec 2010) • G.Saviano (for the CMS RPC Collaboration) Results on chemical analysis in the CMS RPC closed loop, presented at RPC2010, Darmstadt (Germany). To appear on NIM (2011). • Currently running, expect run ending in about 2 months, move test to GIF s.bianco (frascati) CMS RPC Italia 12 maggio

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