Performance of the Tilecal
cooling system
Ana Henriques / Philippe Grenier /
Gerolf Schlager
(CERN)
CERN ATLAS Week, February 2002
Index
• Review - last ATLAS week
• Influence of the ambient temperature
– on the Cooling Unit
– on non-isolated pipes
• Cooling Pilot Project in B185
ATLAS week, February 2002
Gerolf Schlager (CERN)
Review - last ATLAS week
ATLAS week, February 2002
Gerolf Schlager (CERN)
Cooling Unit in H8
return pipes
output pipes
control box
fridge unit
water tank
ATLAS week, February 2002
Gerolf Schlager (CERN)
Stability of the system during data taking
Tout-Drawer
<Mod2>=19.70.1 oC
<Mod5>=19.60.1 oC
Tin-Drawer
<Mod2>=18.30.1 oC
<Mod5>=18.40.1 oC
T-Cooling=18.30.1 oC
ATLAS week, February 2002
Gerolf Schlager (CERN)
PMT gain variation versus temperature
total energy deposited versus temperature in PMT#22
180 GeV electrons
ΔE/E=0.21 %/°C
180 GeV pions
ΔE/E=0.23 %/°C
E/E = 0.2 % / oC(PMT)  E/E = 0.1 % / oC(cooling)
ATLAS week, February 2002
Gerolf Schlager (CERN)
Influence of the ambient
Temperature on the
Cooling Unit
ATLAS week, February 2002
Gerolf Schlager (CERN)
Influence of the ambient Temperature
T-cooling & T-room vs. Time
August
20.0
24.5
T-room
19.0
23.5
T-room
T-cooling
19.5
18.5
18.0
T-cooling=18.4±0.1ºC
T-cooling
22.5
17.5
17.0
21.5
8.23.01 8.24.01 8.24.01 8.25.01 8.25.01 8.26.01 8.26.01 8.27.01 8.27.01 8.28.01 8.28.01 8.29.01
12:00
0:30
13:00
1:30
14:00
2:30
15:00
3:30
16:00
4:30
17:00
5:30
Time
ATLAS week, February 2002
Gerolf Schlager (CERN)
Influence of the ambient Temperature
T-cooling vs. T-Room
18.6
September 01
0.093ºC / ºC (ambient)
T-cooling
18.3
August 01
0.163ºC / ºC (ambient)
18.0
17.7
November 01
17.4
0.113ºC / ºC (ambient)
17.1
12
14
16
18
20
22
24
T-Room
ATLAS week, February 2002
Gerolf Schlager (CERN)
Improved Isolation
18.6
January 02
T-cooling
T-out
18.3
0.027ºC / ºC (ambient)
August 01
0.163ºC / ºC (ambient)
18.0
September 01
0.093ºC / ºC (ambient)
17.7
November 01
17.4
0.113ºC / ºC (ambient)
17.1
12
13
14
15
16
17
18
19
20
21
22
23
24
T-Room
ATLAS week, February 2002
Gerolf Schlager (CERN)
25
Cooling water change
per C(ambient)
August
September
November
January
(improved Isolation)
ATLAS week, February 2002
0.163C
0.093C
0.113C
0.027C
Gerolf Schlager (CERN)
Summary
• For an ambient temperature change of 10°C we
found a Cooling water change of 1.2 °C
– This dependence is a problem during the calibration of
the modules because they will be calibrated at different
places and times
– It does not affect the ATLAS detector because there will
be no noticeable changes of the ambient temperature in
the pit
• We minimized this effect with improved
isolation of the controller sensor
– new values:
ATLAS week, February 2002
0.3°C per 10°C(ambient)
Gerolf Schlager (CERN)
Effects of ambient
temperature on nonisolated pipes
ATLAS week, February 2002
Gerolf Schlager (CERN)
ATLAS - Setup
Temperature
Gradient
5°C
10m
• Temperature at “ “ should be as close
as possible
ATLAS week, February 2002
Cooling Water
Gerolf Schlager (CERN)
Mepla tube characteristics
•
•
•
•
•
3 layer pipe (PE-Al-PE)
Fast easy installation
Bendable, stable
Corrosion resistant
Combines advantages of
plastic and metal pipes
• Foreseen for ATLAS
• satisfy TIS requirements
ATLAS week, February 2002
Gerolf Schlager (CERN)
Non-isolated Mepla Tube Test
• One isolated tube was replaced with a 10m nonisolated Mepla tube
• Difference between Tin-Drawer and T-cooling was
measured  ambient effects on CU removed
10m
Mepla tube
Drawer 4
Isolated tube
Drawer 1
T-cooling
ATLAS week, February 2002
Tin-Drawer
Gerolf Schlager (CERN)
Isolated Tube
January
0.40
Tin-Drawer
– T-cooling
T-in - T-out
0.01°C/ /ºC
°C(ambient)
0.01ºC
(ambient)
0.30
0.20
0.10
0.00
13.0
14.0
15.0
16.0
17.0
T-room
ATLAS week, February 2002
Gerolf Schlager (CERN)
18.0
Non-isolated Mepla Tube
January
0.40
Tin-Drawer
– T-cooling
T-in - T-out
0.30
0.04°C/ /ºC
°C(ambient)
0.04ºC
(ambient)
0.20
0.10
0.00
13.0
14.0
15.0
16.0
17.0
T-room
ATLAS week, February 2002
Gerolf Schlager (CERN)
18.0
Summary
Temperature pick-up
per oC(ambient)
•
isolated tube
non-isolated Mepla tube
0.01oC
0.04oC
• Expected temp-gradient in pit 5°C
=> less than 0.2 °C temperature difference
between lowest and highest module
• Maximum change of PMT temperature  0.1°C
ATLAS week, February 2002
Gerolf Schlager (CERN)
Cooling Pilot Project
in B185
ATLAS week, February 2002
Gerolf Schlager (CERN)
Cooling Pilot Project
Level 3
Level 2
HeatExchanger
Level 1
Outlet
ATLAS week, February 2002
Inlet
•
•
•
•
•
Real Size Test
Bldg. 185
15m scaffolding
Piping done
Installation ready
end of March
• Tests until Sept.02
(finished before PRR)
Gerolf Schlager (CERN)