1. 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 ALICE PRR TRD COOLING P.Glässel, A.Marín, V.Petracek, J.Stachel, M.R.Stockmeier, J.P.Wessels

2. PRR TRD COOLING A. Marín (GSI) 7/01/2004 PRR of the TRD Cooling 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

3. PRR TRD COOLING A. Marín (GSI) 7/01/2004 The TRD detector in ALICE 18 SuperModules in  30 chambers/SM in 6 layers 6/8 Readout Boards/ chamber 16 MCMs/RB 1.18x10 6 channels TRD RB24 RB26

4. PRR TRD COOLING A. Marín (GSI) 7/01/2004 Readout Board in a chamber MCMs Test room Readout board TRD chamber

5. PRR TRD COOLING A. Marín (GSI) 7/01/2004 Map of heat sources in TRD Stack of chambers Readout board

6. PRR TRD COOLING A. Marín (GSI) 7/01/2004 Heat sources in TRD (I) Source #Power (W)AmountTotal Amount (SM) Total Power per SM (W) 0 (VR)0.212/RB45696 1 (VR)0.882/RB 456401 2 (VR)0.0662/RB45630 3 (VR)0.3522/RB456161 4 (VR)0.0091/RB2282 5 (VR)0.0441/RB22810 6 (MCM)0.5216/RB36481897 7 (DCS)51/chamber30150 8 (bars)162/layer12192 The total dissipated power is ~ 53kW

7. PRR TRD COOLING A. Marín (GSI) 7/01/2004 The TRD cooling plant (CERN-ST/CV) F 18 cooling circuits (1/SM) F Inlet RB26/ Outlet RB24 Layout of Supply pipes around the TRDCooling of one TRD super-module

8. PRR TRD COOLING A. Marín (GSI) 7/01/2004 The TRD cooling plant (CERN-ST/CV) F Flow rate: F TRD: 18  1.5m3/h F Total flow = 27 m3/h F Total heat to be removed: ~55kW F Total Volume of water in the installation: ~2000L F Range of available water temperature at the Heaters outlet: F Super-modules: 16~18ºC

9. 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

10. PRR TRD COOLING A. Marín (GSI) 7/01/2004 Voltage regulators (VR) F Temperature in VR test board seen by IR camera F No cooling is applied #1#1#3 #1#1#3#3

11. 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

12. PRR TRD COOLING A. Marín (GSI) 7/01/2004 Desing of Cooling Pads F MCM: 0.520 W F 40x40x0.4 mm 3 Al pad (minimize radiation length) F 2(3) mm inner (outer) diameter Al pipe of length ~ 9 cm F 3M heat conductive tape (9890,5506)

13. PRR TRD COOLING A. Marín (GSI) 7/01/2004 Cooling meander  Cooling circuit across  per SM) F Type A: (#0)+8x(#6)+(#0)+(#1) = 5.45 W F Type B: (#1)+(#2)+(#3)+(#4)+(#5)+8x(#6)+(#2)+(#3)+(#4)+(#5)=5.9W F Water flow : 3.4 l/h   T=1.5 0 C

14. PRR TRD COOLING A. Marín (GSI) 7/01/2004 Test cooling system, MCM F Tap water F Needle valve F 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

15. 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)

16. PRR TRD COOLING A. Marín (GSI) 7/01/2004 IR camera 2 Al pipes over VR 1/2 Al pipes over VR Heat bridges

17. PRR TRD COOLING A. Marín (GSI) 7/01/2004 Long term test using VR setup F Power dissipated: 5.2W (equivalent to a cooling meander) F All pipes in series F Air gap: 15 mm F Good thermal insulation: pipes, air volume F Pipes touching VR (no heat bridges), pipe over RB in both sides

18. PRR TRD COOLING A. Marín (GSI) 7/01/2004 Results of long term test   T water out =1.3-1.5 0 C  expected 1.5 0 C)   T air =6.7 0 C T air stable over 4 days Heat on 3.4-3 l/h

19. PRR TRD COOLING A. Marín (GSI) 7/01/2004 DCS cooling test F 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!

20. PRR TRD COOLING A. Marín (GSI) 7/01/2004 Grounding scheme  Cooling pipes along  electrically insulated from electronics (MCM) and Supermodule  Cooling pipes along  can be electrically insulated from cooling pads or electrically connected To be decided based on noise measurements F Possibility of connecting cooling pipes to RB (or SM) ground To be decided based on noise measurements

21. 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

22. 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