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PRR of the TRD Cooling

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

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PRR of the TRD Cooling

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

  2. 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. The TRD detector in ALICE TRD 18 SuperModules in f 30 chambers/SM in 6 layers 6/8 Readout Boards/ chamber 16 MCMs/RB 1.18x106 channels RB24 RB26

  4. Readout Board in a chamber Test room MCMs Readout board TRD chamber

  5. Map of heat sources in TRD Readout board Stack of chambers

  6. Heat sources in TRD (I) The total dissipated power is ~ 53kW

  7. Layout of Supply pipes around the TRD Cooling of one TRD super-module The TRD cooling plant (CERN-ST/CV) • 18 cooling circuits (1/SM) • Inlet RB26/ Outlet RB24

  8. 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

  9. Routing of services inside SM Power bars: 16 W Main water supply in each layer: 250 l/h

  10. Voltage regulators (VR) #3 #1 #1 #3 • Temperature in VR test board seen by IR camera • No cooling is applied

  11. VR: temperature profile (IR camera) 60 0 C reached without cooling Size of VR:6x3mm2

  12. Desing of Cooling Pads • MCM: 0.520 W • 40x40x0.4 mm3 Al pad (minimize radiation length) • 2(3) mm inner (outer) diameter Al pipe of length ~ 9 cm • 3M heat conductive tape (9890,5506)

  13. Cooling meander • Cooling circuit across f ( 456 per SM) • 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 • DT=1.50C

  14. Test cooling system, MCM Tin = 14.60C Tout = 15.60C Readout board • Tap water • Needle valve • Pressure meter TMCM = 21.30C 19.60C 20.50C MCM dTglob-top = 4.10C 3.20C 4.40C

  15. Optimization VR (a) (b) dTVR1 = 8.50C /9.30C dTVR3= 4.40C dTVR0= 3.50C/5.40C foam (a) 2 Al pipes over VR (b) 1/2 Al pipes over VR Heat bridges 1 Al pipes touching RB

  16. 2 Al pipes over VR IR camera 1/2 Al pipes over VR Heat bridges

  17. 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

  18. Results of long term test • DTwater out=1.3-1.50C (expected 1.50C) • DTair=6.70C Tair stable over 4 days Heat on 3.4-3 l/h

  19. DCS cooling test Flash VR FPGA/EPXA1 TTCrx • Pipes over main heat dissipation components Tin = 18.70C Tout= 200C TVR1 = 33.70C TVR2 = 35.80C TTTCrx= 33.70C TFPGA= 36.80C Tair= 290C Ethernet New DCS ,VR in parallel! SDRAM

  20. Grounding scheme • Cooling pipes along f electrically insulated from electronics (MCM) and Supermodule • Cooling pipes along f can be electrically insulated from cooling pads or electrically connected To be decided based on noise measurements • Possibility of connecting cooling pipes to RB (or SM) ground To be decided based on noise measurements

  21. Assembly and tests • Meander construction in a company • Measure pressure drop in each meander • Glue Al plates in each cooling meander. Electrically insulating material between pipe and plate if needed for noise requirements. • Put heat conductive tape on top of each component • Glue cooling meanders to RB in a flat table using Al-filled epoxy. • Inspect visually that all Al plates are touching the heat sources. Mark each checked component. • Power electronics and measure the temperature underneath each heat source using a plate equipped with Pt100 at given positions. • Check that all electronics is still working. Avoid damage during gluing • 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 • Once every layer is fully equipped test for leak tightness by pumping with vacuum pump

  22. Material used • Al tube of 2(3) mm inner (outer) diameter. • Al plates of 40x40x0.4 mm3 • 3M tape (5506,9890) for thermal conductivity and electrical isolation • Al powder and epoxy

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