ALICE PRR TRD COOLING

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Nov 24, 2013 (3 years and 8 months ago)

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PRR TRD COOLING A. Marín (GSI)

7/01/2004


ALICE PRR TRD COOLING


P.Glässel, A.Marín, V.Petracek, J.Stachel, M.R.Stockmeier, J.P.Wessels







PRR TRD COOLING A. Marín (GSI)

7/01/2004


PRR of the TRD Cooling


The TRD detector in ALICE


Cooling plant


Heat generated by the detector


Map of heat sources


Routing of pipes


Test measurements


Construction and tests during assembly


List of materials used





PRR TRD COOLING A. Marín (GSI)

7/01/2004

The TRD detector in ALICE

18 SuperModules in
f

30 chambers/SM in 6
layers

6/8 Readout Boards/
chamber

16 MCMs/RB

1.18x10
6

channels

TRD

RB24

RB26


PRR TRD COOLING A. Marín (GSI)

7/01/2004

Readout Board in a chamber

MCMs

Test room

Readout board

TRD chamber


PRR TRD COOLING A. Marín (GSI)

7/01/2004

Map of heat sources in TRD

Stack of chambers

Readout board


PRR TRD COOLING A. Marín (GSI)

7/01/2004

Heat sources in TRD (I)

Source #

Power (W)

Amount

Total Amount
(SM)

Total Power
per SM (W)

0 (VR)

0.21

2/RB

456

96

1 (VR)

0.88

2/RB

456

401

2 (VR)

0.066

2/RB

456

30

3 (VR)

0.352

2/RB

456

161

4 (VR)

0.009

1/RB

228

2

5 (VR)

0.044

1/RB

228

10

6 (MCM)

0.52

16/RB

3648

1897

7 (DCS)

5

1/chamber

30

150

8 (bars)

16

2/layer

12

192

The total dissipated power is ~ 53kW


PRR TRD COOLING A. Marín (GSI)

7/01/2004

The TRD cooling plant (CERN
-
ST/CV)


18 cooling circuits (1/SM)


Inlet RB26/ Outlet RB24


1500L/h @ 16~20
o
C
TRD supermodule
RB26 side
RB24 side
Layout of Supply pipes around the TRD


Cooling of one TRD super
-
module


PRR TRD COOLING A. Marín (GSI)

7/01/2004

The TRD cooling plant (CERN
-
ST/CV)


Flow rate:


TRD: 18


1.5m3/h


Total flow = 27

m3/h



Total heat to be removed:
~55kW



Total Volume of water in the
installation:
~2000L




Range of available water
temperature at the Heaters
outlet:


Super
-
modules: 16~18ºC







Heaters
TRD
Supply
manifold
18 outlets
Thermal
screen
Supply
manifold
18 outlets
Mixed water
Compressed
air
1500L/h @
16~20
o
C
TRD supermodule
RB26 side
RB24 side
300L/h @ 18~20
o
C
Thermal screen
Return
manifold
36 inlets
C
Mixed-bed
de-ionizer

PRR TRD COOLING A. Marín (GSI)

7/01/2004

Routing of services inside SM

Main water supply in each layer: 250 l/h

Power bars:

16 W


PRR TRD COOLING A. Marín (GSI)

7/01/2004

Voltage regulators (VR)


Temperature in VR test board seen by IR camera


No cooling is applied

#
1

#3

#
1

#
3


PRR TRD COOLING A. Marín (GSI)

7/01/2004

VR: temperature profile (IR camera)

60

0
C reached without cooling


Size of VR:6x3mm
2


PRR TRD COOLING A. Marín (GSI)

7/01/2004

Desing of Cooling Pads


MCM: 0.520 W


40x40x0.4 mm
3

Al pad (minimize radiation length)


2(3) mm inner (outer) diameter Al pipe of length ~ 9 cm


3M heat conductive tape (9890,5506)


PRR TRD COOLING A. Marín (GSI)

7/01/2004

Cooling meander


Cooling circuit across
f ( 456
灥爠卍r


Type A: (#0)+8x(#6)+(#0)+(#1) = 5.45 W


Type B: (#1)+(#2)+(#3)+(#4)+(#5)+8x(#6)+(#2)+(#3)+(#4)+(#5)=5.9W


Water flow : 3.4 l/h


D
T=1.5
0
C


PRR TRD COOLING A. Marín (GSI)

7/01/2004

Test cooling system, MCM


Tap water


Needle valve


Pressure meter

Readout board

MCM

T
in

= 14.6
0
C

T
out

= 15.6
0
C

T
MCM

= 21.3
0
C


19.6
0
C


20.5
0
C

dT
glob
-
top
= 4.1
0
C


3.2
0
C


4.4
0
C


PRR TRD COOLING A. Marín (GSI)

7/01/2004

Optimization VR


foam

(a) 2 Al pipes over VR

1 Al pipes touching RB

(b) 1/2 Al pipes over VR

Heat bridges


dT
VR1

= 8.5
0
C /9.3
0
C


dT
VR3

=

4.4
0
C


dT
VR0

=

3.5
0
C/5.4
0
C

(a) (b)


PRR TRD COOLING A. Marín (GSI)

7/01/2004

IR camera


2 Al pipes over VR


1/2 Al pipes over VR

Heat bridges



PRR TRD COOLING A. Marín (GSI)

7/01/2004

Long term test using VR setup


Power dissipated: 5.2W (equivalent to a cooling meander)


All pipes in series


Air gap: 15 mm


Good thermal insulation: pipes, air volume


Pipes touching VR (no heat bridges), pipe over RB in both
sides


PRR TRD COOLING A. Marín (GSI)

7/01/2004

Results of long term test



D
T
water out
=1.3
-
1.5
0
C


(
expected 1.5
0
C)


D
T
air
=6.7
0
C



T
air
stable over 4 days

Heat on

3.4
-
3 l/h


PRR TRD COOLING A. Marín (GSI)

7/01/2004

DCS cooling test


Pipes over main
heat dissipation
components

FPGA/EPXA1

VR

Ethernet

SDRAM

Flash

TTCrx


T
in
= 18.7
0
C


T
out
= 20
0
C

T
VR1
= 33.7
0
C

T
VR2
= 35.8
0
C

T
TTCrx
= 33.7
0
C


T
FPGA
= 36.8
0
C


T
air
= 29
0
C

New DCS ,VR in parallel!


PRR TRD COOLING A. Marín (GSI)

7/01/2004

Grounding scheme


Cooling pipes along
f
敬散瑲t捡汬y 楮獵污瑥搠晲f洠敬散瑲t湩捳
(MCM) and Supermodule


Cooling pipes along
f
捡渠扥⁥汥捴物r慬汹 楮獵污瑥搠晲f洠
捯潬楮朠灡摳 潲o敬散瑲t捡汬y 捯湮散瑥搠

To be decided based on noise measurements


Possibility of connecting cooling pipes to RB (or SM)
ground

To be decided based on noise measurements




PRR TRD COOLING A. Marín (GSI)

7/01/2004

Assembly and tests

1.
Meander construction in a company

2.
Measure pressure drop in each meander

3.
Glue Al plates in each cooling meander. Electrically insulating material
between pipe and plate if needed for noise requirements.

4.
Put heat conductive tape on top of each component

5.
Glue cooling meanders to RB in a flat table using Al
-
filled epoxy.

6.
Inspect visually that all Al plates are touching the heat sources. Mark
each checked component.

7.
Power electronics and measure the temperature underneath each heat
source using a plate equipped with Pt100 at given positions.

8.
Check that all electronics is still working. Avoid damage during gluing

9.
Position the RB preequipped with cooling meanders in the chambers.
Connect the cooling meanders between the two RB and between RB and
the main water supply using Viton connectors. Fix RB to chambers

10.
Once every layer is fully equipped test for leak tightness by pumping
with vacuum pump




PRR TRD COOLING A. Marín (GSI)

7/01/2004

Material used

1.
Al tube of 2(3) mm inner (outer) diameter.

2.
Al plates of 40x40x0.4 mm
3

3.
3M tape (5506,9890) for thermal conductivity and electrical
isolation

4.
Al powder and epoxy