emu meeting, houston, jan. 11-12, 2002o.prokofiev 1 emu cms meeting o.prokofiev fermilab summary of...
TRANSCRIPT
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
EMU Meeting, Houston, Jan. 11-12, 2002O.Prokofiev 2
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
EMU Meeting, Houston, Jan. 11-12, 2002O.Prokofiev 3
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
EMU Meeting, Houston, Jan. 11-12, 2002O.Prokofiev 4
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 Meeting, Houston, Jan. 11-12, 2002O.Prokofiev 5
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 Meeting, Houston, Jan. 11-12, 2002O.Prokofiev 6
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 Meeting, Houston, Jan. 11-12, 2002O.Prokofiev 7
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 Meeting, Houston, Jan. 11-12, 2002O.Prokofiev 8
EMU Gas System Prototype GIF - 2001
EMU Gas System Prototype GIF - 2001
EMU Meeting, Houston, Jan. 11-12, 2002O.Prokofiev 9
EMU Gas System PrototypeGas purity, Flow rate
EMU Gas System PrototypeGas purity, Flow rate
Gas System operation with ME 1/2 chamber
-30
0
30
60
90
120
150
180
0 20 40 60 80 100 120 140 160 180
Day, from 11 March 2001
Flo
w R
ate,
l/h
Purifiersaturated
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
EMU Meeting, Houston, Jan. 11-12, 2002O.Prokofiev 10
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
0
50
100
150
200
250
300
350
400
450
25 30 35 40 45 50 55 60 65 70
Days. from 11 March 2001
Ox
yg
en
, p
pm
0
25
50
75
100
125
150
175
200
225
Ga
s F
low
Ra
te,
l/h
ou
r
Oxygen contamination
Gas flow rate
D
Direct branch
Purifier off
GIF off
HV off
EMU Meeting, Houston, Jan. 11-12, 2002O.Prokofiev 11
ME4/1Chamber Oxygen Contamination
ME4/1Chamber Oxygen Contamination
0
100
200
300
400
500
600
0.0 200.0 400.0 600.0 800.0 1000.0 1200.0 1400.0
Time, hour (from 6.10.01)
Ox
yg
en
, p
pm
0
20
40
60
80
100
Flo
w r
ate
, l/
ho
urOxygen
Flow Rate
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 Meeting, Houston, Jan. 11-12, 2002O.Prokofiev 12
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
0
100
200
300
400
500
0 50 100 150 200 250 300 350
Time, hour
Oxy
gen
, pp
m
0
5
10
15
20
25
Flo
w r
ate,
l/h
Flow Rate
Oxyge
Oxygen Level in the Gas System
0
100
200
300
400
500
0 50 100 150 200 250
Time, min
Ox
yg
en
, pp
m Test #1
Test #2
Flow RateFlow Rate OxygenOxygen
6 l/hour6 l/hour 400 ppm400 ppm
12 l/hour12 l/hour 200 ppm200 ppm
18 l/hour18 l/hour 140 ppm140 ppm
ME4/1 Chamber ME4/1 Chamber
~ 16 ppm
EMU Meeting, Houston, Jan. 11-12, 2002O.Prokofiev 13
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 Meeting, Houston, Jan. 11-12, 2002O.Prokofiev 14
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 Meeting, Houston, Jan. 11-12, 2002O.Prokofiev 15
EMU Gas SystemGas Mixture Impurities Limits
EMU Gas SystemGas Mixture Impurities Limits
0
200
400
600
800
1000
1200
0 25 50 75 100 125 150
Flow Rate per Gas Channel, l/hour
Oxyg
en
, p
pm
Large Chambers
Small Chambers
Oxygen
Technical specs
Flow RateRange
Nitrogen
0
0.5
1
1.5
2
2.5
3
3.5
4
0 5 10 15 20
Fresh gas , %
Nit
rog
en
. %
Fresh GasOperation Range
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