emu cms meeting

EMU Meeting, Houston, Jan. 11-12, 2002O.Prokofiev 1

EMU CMS MeetingEMU CMS Meeting

O.Prokofiev

Fermilab

Summary of the CSC aging tests

Copy of slides prepared for EMU meeting in 2002


Aging Tests Aging Tests

Aging tests 1997 - 2001

Results SEM/XEM measurements

Closed loop gas system operation and air infiltration rate

Aging tests 1997 - 2001

Results SEM/XEM measurements

Closed loop gas system operation and air infiltration rate


Chamber Materials, Components and Chemicals

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 - 2216, part A and B

(constructional epoxy) Epoxy – Epolite 5313 + hardener (wire

gluing) RTV - 41 + curing agent (outside

chamber sealing) Solder wire Almit KR-19 SH RMA , Seika Corp. (new product)

Chemicals: Epoxy - 2216, part A and B

(constructional epoxy) Epoxy – Epolite 5313 + hardener (wire

gluing) RTV - 41 + 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


Aging Test at CERN (2000-2001) Aging Test at CERN (2000-2001)

• 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)

• 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 Closed Loop Gas System PrototypeEMU Closed Loop Gas System Prototype

Closed Loop Gas System Prototypefor Aging Tests at CERN

Closed Loop Gas System Prototypefor 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 Closed Loop Gas System PrototypeEMU 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 (O2, N2, H2O)

Goal:

- Investigation of CSC operation with Closed Loop Gas System Prototype

- Gas mixture monitoring

- Chromatographic analysis to measure Impurities level

- air infiltration rate measurements (O2, N2, H2O)


EMU Gas System SpecificationEMU Gas System Specification

Basic Specification1. Total Detector Volume - 65.6 m3 T 2. Original gas component specs (minimum purity)

- Argon - 46 (99.996%), Carbon dioxide - 40 (99.99%), CF4 - 45 (99.995%) 3. Gas mixture impurity limits:

- oxygen -> 100 ppm, nitrogen -> 3000 ppm, water -> 1000 ppm, other halocarbons, oil? 4 Gas mixture : CF4 /Ar/CO2 (10/40/50)

- fourth gas component (isoC4H10) should be reserved - precision (+-1%), stability (+- 0.3%)

5. Circulation gas flow rate - nominal : 7.0 m3/hour (gas exchange - 6/12 hours)

- flow range: 1.4 - 14.0 m3/hour 6. Nominal fresh gas injection (the first set of mass flow meter controllers)

- 350 l/hour (5% of the detector gas volume to renew gas in the system for 8 days) - fresh gas injection range: 70 - 700 liter/hour

7. Fast fresh gas system filling (the second set of mass flow meter controllers) - nominal 3.5 m3/hour (6/12 hours gas system exchange) - fast gas filling range 0.7 - 7 m3/hour

8. Chamber gas pressure - nominal : 1-3 mbar above atmospheric - minimum - 0.5 mbar, maximum - 5 mbar

9. Chamber leak - nominal: 10-5 chamber volume/min (40 l/hour for all chambers) - maximum leak rate - 700 liter/hour

10. Maximum air infiltration rate from the chamber leak (1.5% nitrogen) - N2 => 5.0 liter/hour, O2 => 1.0 liter/hour, H2O => 0.16 gram /hour

11. Gas purification /regeneration - H2O and O2 purification (purifier cartridge: molecular sieve and activated copper)


EMU Gas System Prototype GIF - 2001

EMU Gas System Prototype GIF - 2001


EMU Gas System PrototypeGas purity, Flow rate

EMU Gas System PrototypeGas purity, Flow rate

Gas System operation with ME 1/2 chamber

-30

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Open Loop Closed Loop

Cylinder #1.#2 40%Ar(48)+50%CO2(48)+10%CF4(45)Cylinder #3 40%Ar(46)+50%CO2(40)+10%CF4(45)

Closed Loop

Direct branch

Fast Flow

Cylinder#1 Cylinder#2 Cylinder#3


ME1/2 Chamber Oxygen contamination

ME1/2 Chamber Oxygen contamination

ME1/2 Chamber:ME1/2 Chamber:At nominal flow rate 12 l/hour oxygen level is ~ 150 ppmAt nominal flow rate 12 l/hour oxygen level is ~ 150 ppm

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Gas flow rate

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GIF off

HV off


ME4/1Chamber Oxygen Contamination

ME4/1Chamber Oxygen Contamination

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Gas system operation without chamber

Oxygen vs Flow

Oxygen sensor kaput

ME4/1 ChamberME4/1 ChamberAt nominal flow rate 12 l/hour oxygen level is ~ 200 ppmAt nominal flow rate 12 l/hour oxygen level is ~ 200 ppm


EMU Gas System Prototype Oxygen Level Estimation

EMU Gas System Prototype Oxygen Level Estimation

Oxygen Contamination

Gas System + Chamber:Nominal Flow Rate - 12 l/hourME1/2 150 ppm ME4/1 200 ppmGas System :Flow Rate 12 l/hourOxygen 16 ppm (2 measurements)

ME4/1 ChamberOxygen Level verses Flow Rate

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Oxygen Level in the Gas System

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Flow RateFlow Rate OxygenOxygen

6 l/hour6 l/hour 400 ppm400 ppm



ME4/1 Chamber ME4/1 Chamber

~ 16 ppm


EMU Gas System Oxygen Intake Estimation

EMU Gas System Oxygen Intake Estimation

Small chambers (ME234/1, ME1/23, Volume ~ 100 l )

Data: Flow Rate = 12 l/hour, O2 = 150 - 200ppmOxygen intake is about ~ 2.0 - 2.5 cm3/hour/chamberChamber Leak Limits: 60 - 120 cm3/hour (1 - 2 cm3/min)

Large chambers (ME234/2, Volume ~ 200 l )

No data. It should be twice more than for small chambersOxygen intake is about ~ 4.0 – 5.0 cm3/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) : O2 ~ 15 cm3/h/ch 300 ppmSmall chambers (3-4/ch) : O2 ~ 7.5 cm3/h/ch 150 ppm

Technical specs on Qxygen limits: 100 ppm

Need to change to 500 - 1000 ppm ???


EMU Gas SystemNitrogen Intake Estimation

EMU Gas SystemNitrogen Intake Estimation

Nitrogen EstimationGIF-2001: - fresh gas injection ~ 0.6 l/hour - O2 ~ 2.0 - 2.5 cm3/hour N2

~ 10 cm3/hour - N2

level ~ 1.7% (17000 ppm) ???

EMU gas system

Oxygen intake is ~ 7.5 – 15 cm3/hour/gas channel Nitrogen should be 4 times more than Oxygen that is ~ 50 cm3/hour/channel or 8.0 l/hour for all detector (162 channels)

Nitrogen level in the system will be ~ 1% or 10000 ppm???

Nitrogen limit (technical specs) is 3000 ppm

EMU Gas System parameters:EMU Gas System parameters:Detector volume ~ 66 mDetector volume ~ 66 m3

Nominal gas flow rate ~ 7.0 mNominal gas flow rate ~ 7.0 m3 / hourNumber of gas channels - 81Fresh gas injection – Fresh gas injection – 5% (350 l/hour) from nominal flow rate from nominal flow rateRenewing gas mixture in the system ~ 8 days (~200 hours)Renewing gas mixture in the system ~ 8 days (~200 hours)


EMU Gas SystemGas Mixture Impurities Limits

EMU Gas SystemGas Mixture Impurities Limits

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Flow Rate per Gas Channel, l/hour

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Oxygen

Technical specs

Flow RateRange

Nitrogen

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Technical specs

Need to make more measurements on oxygen and water Need to make more measurements on oxygen and water contamination in the CSC chambers contamination in the CSC chambers

Need to make more measurements on oxygen and water Need to make more measurements on oxygen and water contamination in the CSC chambers contamination in the CSC chambers

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