EMU Meeting, Houston, Jan , 2002O.Prokofiev 1 EMU CMS Meeting O.Prokofiev Fermilab Summary of the CSC aging tests Copy of slides prepared for EMU meeting in 2002

EMU Meeting, Houston, Jan , 2002O.Prokofiev 2 Aging Tests Aging tests Results SEM/XEM measurements Closed loop gas system operation and air infiltration rate Aging tests Results SEM/XEM measurements Closed loop gas system operation and air infiltration rate

EMU Meeting, Houston, Jan , 2002O.Prokofiev 3 Chamber Materials, Components and Chemicals Chamber material: Panels - FR-4 sheets + polycarbonate core Gap bars, anode bars, spacers - FR-4 Anode wires - LUMA gold plated tungsten Guard wires - gold plated CU-Be guard Chamber material: Panels - FR-4 sheets + polycarbonate core Gap bars, anode bars, spacers - FR-4 Anode wires - LUMA gold plated tungsten Guard wires - gold plated CU-Be guard Components : Capacitors - ceramic, 1nF, 7.5 kV Resistors - carbon composite O-Ring – rubber fluorocarbon Components : Capacitors - ceramic, 1nF, 7.5 kV Resistors - carbon composite O-Ring – rubber fluorocarbon Chemicals : Epoxy , part A and B (constructional epoxy) Epoxy – Epolite hardener (wire gluing) RTV curing agent (outside chamber sealing) Solder wire Almit KR-19 SH RMA, Seika Corp. (new product) Chemicals : Epoxy , part A and B (constructional epoxy) Epoxy – Epolite hardener (wire gluing) RTV curing agent (outside chamber sealing) Solder wire Almit KR-19 SH RMA, Seika Corp. (new product) RTV O-Ring RTV Epoxy Soldering Epoxy Soldering Epoxy Gluing

EMU Meeting, Houston, Jan , 2002O.Prokofiev 4 Aging Test at CERN ( ) Full Scale CMS ME1/2 and ME4/1 chambers from production line Large (2/3) chamber area irradiated, accumulated dose > 30 LHC years Two rounds of ageing tests: premixed gas, open loop gas system, 1 volume/day (GIF-2000) closed loop gas system, 4 volume/day, 5% refresh gas (GIF-2001) Full Scale CMS ME1/2 and ME4/1 chambers from production line Large (2/3) chamber area irradiated, accumulated dose > 30 LHC years Two rounds of ageing tests: premixed gas, open loop gas system, 1 volume/day (GIF-2000) closed loop gas system, 4 volume/day, 5% refresh gas (GIF-2001)

EMU Meeting, Houston, Jan , 2002O.Prokofiev 5 EMU Closed Loop Gas System Prototype Closed Loop Gas System Prototype for Aging Tests at CERN Closed Loop Gas System Prototype for Aging Tests at CERN Gas System Prototype was constructed at CERN in March 2001 by F.Hahn group Gas System Prototype was constructed at CERN in March 2001 by F.Hahn group

EMU Meeting, Houston, Jan , 2002O.Prokofiev 6 EMU Closed Loop Gas System Prototype Goal: - Investigation of CSC operation with Closed Loop Gas System Prototype - Gas mixture monitoring - Chromatographic analysis to measure Impurities level - air infiltration rate measurements (O 2, N 2, H 2 O) Goal: - Investigation of CSC operation with Closed Loop Gas System Prototype - Gas mixture monitoring - Chromatographic analysis to measure Impurities level - air infiltration rate measurements (O 2, N 2, H 2 O)

EMU Meeting, Houston, Jan , 2002O.Prokofiev 7 EMU Gas System Specification Basic Specification

EMU Meeting, Houston, Jan , 2002O.Prokofiev 8 EMU Gas System Prototype GIF

EMU Meeting, Houston, Jan , 2002O.Prokofiev 9 EMU Gas System Prototype Gas purity, Flow rate

EMU Meeting, Houston, Jan , 2002O.Prokofiev 10 ME1/2 Chamber Oxygen contamination ME1/2 Chamber: At nominal flow rate 12 l/hour oxygen level is ~ 150 ppm

EMU Meeting, Houston, Jan , 2002O.Prokofiev 11 ME4/1Chamber Oxygen Contamination Time, hour (from ) Oxygen, ppm Flow rate, l/hour Oxygen Flow Rate Gas system operation without chamber Oxygen vs Flow Oxygen sensor kaput ME4/1 Chamber At nominal flow rate 12 l/hour oxygen level is ~ 200 ppm

EMU Meeting, Houston, Jan , 2002O.Prokofiev 12 EMU Gas System Prototype Oxygen Level Estimation Oxygen Contamination Gas System + Chamber: Nominal Flow Rate - 12 l/hour ME1/2 150 ppm ME4/1 200 ppm Gas System : Flow Rate 12 l/hour Oxygen 16 ppm (2 measurements) Flow Rate Oxygen 6 l/hour 400 ppm 12 l/hour 200 ppm 18 l/hour 140 ppm ME4/1 Chamber ~ 16 ppm

EMU Meeting, Houston, Jan , 2002O.Prokofiev 13 EMU Gas System Oxygen Intake Estimation Small chambers (ME234/1, ME1/23, Volume ~ 100 l ) Data: Flow Rate = 12 l/hour, O 2 = ppm Oxygen intake is about ~ cm 3 /hour/chamber Chamber Leak Limits: cm 3 /hour (1 - 2 cm 3 /min) Large chambers (ME234/2, Volume ~ 200 l ) No data. It should be twice more than for small chambers Oxygen intake is about ~ 4.0 – 5.0 cm 3 /hour/chamber EMU Gas System Distribution: 3 ME234/2 or 3 ME234/1 or 4 ME1/23 per gas channel Flow rate / gas channel = ~ 50 l/hour Oxygen estimation at nominal flow rate ~ 50 l/hour: Large chambers (3/ch) : O 2 ~ 15 cm 3 /h/ch 300 ppm Small chambers (3-4/ch) : O 2 ~ 7.5 cm 3 /h/ch 150 ppm Technical specs on Qxygen limits: 100 ppm Need to change to ppm ???

EMU Meeting, Houston, Jan , 2002O.Prokofiev 14 EMU Gas System Nitrogen Intake Estimation Nitrogen Estimation GIF-2001: - fresh gas injection ~ 0.6 l/hour - O 2 ~ cm 3 /hour N 2 ~ 10 cm 3 /hour - N 2 level ~ 1.7% (17000 ppm) ??? EMU gas system Oxygen intake is ~ 7.5 – 15 cm 3 /hour/gas channel Nitrogen should be 4 times more than Oxygen that is ~ 50 cm 3 /hour/channel or 8.0 l/hour for all detector (162 channels) Nitrogen level in the system will be ~ 1% or ppm??? Nitrogen limit (technical specs) is 3000 ppm EMU Gas System parameters: Detector volume ~ 66 m Detector volume ~ 66 m 3 Nominal gas flow rate ~ 7.0 m Nominal gas flow rate ~ 7.0 m 3 / hour Number of gas channels - 81 Fresh gas injection – from nominal flow rate Fresh gas injection – 5% (350 l/hour) from nominal flow rate Renewing gas mixture in the system ~ 8 days (~200 hours)

EMU Meeting, Houston, Jan , 2002O.Prokofiev 15 EMU Gas System Gas Mixture Impurities Limits Need to make more measurements on oxygen and water contamination in the CSC chambers Need to make more measurements on oxygen and water contamination in the CSC chambers