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Belle-II PXD support: Thermo-mechanical activities at Valencia

VI Jornadas sobre la participación española en Futuros Aceleradores Lineales. Belle-II PXD support: Thermo-mechanical activities at Valencia. Carlos Lacasta, Arantza Oyanguren. (IFIC - Valencia). Outline.  M otivation.  The Belle-II Pixel detector (PXD).

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Belle-II PXD support: Thermo-mechanical activities at Valencia

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  1. VI Jornadas sobre la participación española en Futuros Aceleradores Lineales Belle-II PXD support: Thermo-mechanical activities at Valencia Carlos Lacasta, Arantza Oyanguren (IFIC - Valencia)

  2. Outline  Motivation The Belle-II Pixel detector (PXD) Thermal mock-up at Valencia  First studies of cooling  Conclusions Arantza Oyanguren 2 VI Jornadas sobre la participación española en Futuros Aceleradores Lineales

  3. Motivation http://newsline.linearcollider.org/2011/03/31/i-have-a-dream/ LHC: results decisive to define future strategies (2012)  Present explotation of data is fundamental ILC/CLIC: construction envisaged for 2014/16, operation in 2021  Present R&D is fundamental Super Flavour Factories: unique competitive and complementary data with LHC in this era  Present contribution to construction (and data explotation) is fundamental Arantza Oyanguren 3 VI Jornadas sobre la participación española en Futuros Aceleradores Lineales

  4. The Belle-II PXD  The Belle-II detector @ SuperKEKB New KL/ detectors New CsI calo SC solenoid 1.5T New Central Drift Chamber New PID detectors New vertex detector Arantza Oyanguren 4 VI Jornadas sobre la participación española en Futuros Aceleradores Lineales

  5. The Belle-II PXD The Belle-II vertex detector • 6 layers at radii from 1.4 cm to 14 cm, • (4 times more readout channels compared • to SVD2 (BELLE) ) Beam-pipe (r=1cm) 2 layers of pixel detectors (DEPFET) 4 layers of strips (DSSD) Arantza Oyanguren 5 VI Jornadas sobre la participación española en Futuros Aceleradores Lineales

  6. The Belle-II PXD Prototype DEPFET pixel sensor and readout ~ 8 Mpixels Arantza Oyanguren 6 VI Jornadas sobre la participación española en Futuros Aceleradores Lineales

  7. Thermal Mock-up  Thermo-mechanical activities at Valencia: • Determine the optimal conditions for the sensors: • Cooling of support structures (cooling blocks) • Heat dissipation along the sensors (air flow studies) • Heat dissipation in the PXD volume • - Cross-check simulation studies (Carlos Mariñas) Arantza Oyanguren 7 VI Jornadas sobre la participación española en Futuros Aceleradores Lineales

  8. Thermal Mock-up  Thermal mock-up at Valencia: Al beam-pipe  cooled by monophase chiller (nominal T = 15 C) Arantza Oyanguren 8 VI Jornadas sobre la participación española en Futuros Aceleradores Lineales

  9. Thermal Mock-up  Thermal mock-up at Valencia: Cooling blocks support rings (Al) Arantza Oyanguren 9 VI Jornadas sobre la participación española en Futuros Aceleradores Lineales

  10. Thermal Mock-up External support rings (PVC) PXD volume Arantza Oyanguren 10 VI Jornadas sobre la participación española en Futuros Aceleradores Lineales

  11. Thermal Mock-up Cooling blocks (several materials) 3D sintering process CO2 Air flow Blue: CO2 capillaries Yellow: Air channels Arantza Oyanguren 11 VI Jornadas sobre la participación española en Futuros Aceleradores Lineales

  12. Thermal Mock-up Cooling block materials:  Going to MPI for pressure tests BrNi CrCo AlSiMg Stainless steel Properties: 30 18 400 Residual magnetism Porous (!) 13 14 1200 - Difficult to machine (polish, drill, etc.) - Non magnetic 140 21 310 (?) -“malleable” (to drill, polish…) -Non magnetic 15 17 650 Pores and leaks in our samples (leaks by manipulation) Therm. conduct. (W/mK): CTE (um/mC): Resistence (N/mm2): Comments : Arantza Oyanguren 12 VI Jornadas sobre la participación española en Futuros Aceleradores Lineales

  13. Thermal Mock-up  Dummy ladders: Polycarbonate Al Cu Heaters Resistor samples Arantza Oyanguren 13 VI Jornadas sobre la participación española en Futuros Aceleradores Lineales

  14. Thermal Mock-up Thermal contact between cooling block and ladder Al ladder temperature profile (end flanges are cooled down) end flanges Thermal contacteffect T Al ladder Badcontact • T strongly depends on the thermal contact end flanges  Thermal paste + screws • Quite difficult to thread on CrCo, at present using double sided thermal tape • (thermal conductivity = 0.8 W/mK) Ideal contact Arantza Oyanguren 14 VI Jornadas sobre la participación española en Futuros Aceleradores Lineales

  15. Thermal Mock-up Arantza Oyanguren 15 VI Jornadas sobre la participación española en Futuros Aceleradores Lineales

  16. Thermal Mock-up CO2 open system Nitrogen liquidDewar (cooled air) Thermally isolated box withdryatmosphere Mock-up IR camera chiller Arantza Oyanguren 16 VI Jornadas sobre la participación española en Futuros Aceleradores Lineales

  17. Cooling studies  Effect of air flow cooling - Beam pipe at room temperature (can be cooled with chiller  15 C) - CrCo end flanges (2), cooled down with CO2 (~12bar) - Cu ladders with heaters: Power dissipated along ladder: 1W  T ~ 30C; 4 inner ladders, only one with heater 1 outer ladder with heater - Air flow: dry air at ~ room temperature (20C) or cooled down with liquid N2 - Measure temperature on inner and outer ladders with IR camera, calibrated with PT100s and Tipp-ex marks (ε=0.95) - Room: T=24 C, Humidity=8% Arantza Oyanguren 17 VI Jornadas sobre la participación española en Futuros Aceleradores Lineales

  18. Cooling studies Thermal images: Switching the heaters on Cooling down the end flanges with CO2 : Tipp-Ex marks  Real temperaturegivenbyTipp-ex marks (ε=0.95) (global imageemissivity)  Emissivity of othermaterialshavetobecorrected [ Ice emmisivity  0.97  frost (slightly, H=8%) giveapproximatetemperature ] Arantza Oyanguren 18 VI Jornadas sobre la participación española en Futuros Aceleradores Lineales

  19. Cooling studies - Heaters on - Air flow at 20 C (~2m/s) - Cooling blocks at room T innerladder innerladder x ladder Temperature (C) T (C) Air cooling -heater outerladder outerladder x ladder Camera position T (C) Temperature (C) Air cooling -heater  ~-7 C in both ladders x ladder Arantza Oyanguren 19 VI Jornadas sobre la participación española en Futuros Aceleradores Lineales

  20. Cooling studies - Heaters on - Air flow at 20 C - Cooling blocks with CO2 (12bar)  Not good thermal contact (thermal tape)  Cooling blocks at -31 C  Images still to be analized, PT100s and Tipp-ex marks show a few degrees for inner ladder (IL) (worst thermal contact) and -6 C for outer ladder (OL).  Switching off the air flow  - 4 C (IL) -10 C (OL) Arantza Oyanguren 20 VI Jornadas sobre la participación española en Futuros Aceleradores Lineales

  21. Cooling studies  Tests by cooling the air with liquid N2  difficult to control the temperature, inner and outer ladders at – few degrees. (Onlycold air flow (N2) Cooling blocks at room T) (Onlyonecooling block operating) ?? Arantza Oyanguren 21 VI Jornadas sobre la participación española en Futuros Aceleradores Lineales

  22. Cooling studies  Mock-up used as test-bench to measure temperature, deformation and vibrations with FBGs (IFCA activities at Valencia) Free FBG inside box FBG attached Cooling Block FBG glued X60 Cooling Block FBG attached Beam Pipe D. Moya (VII DEPFET Workshop) 22 Arantza Oyanguren 22 VI Jornadas sobre la participación española en Futuros Aceleradores Lineales

  23. Conclusions  Mockup ready at Valencia to give support to Belle-II PXD : - Cooling studies to determine the optimal conditions for the sensors * Caveats: in AlSiMg samples stainless steel pipes cannot be directly welded  trying with aluminium pipes (resistent to CO2 pressure??) + problems in the welding process: blocked pipes, have to be removed and re-welded  Several test expectd in the coming weeks with the two types of cooling blocks.  This mockup may also be useful for other groups/tasks: - FBG’s tests from IFCA - AIDA activities (?) - ITA (?) Arantza Oyanguren 23 VI Jornadas sobre la participación española en Futuros Aceleradores Lineales

  24. Backup Tipp-Ex marks (ε=0.95) Air flow (20C) - Only 1 CrCo operating end flange  air flow test - Aluminium ladders with heaters (1W); 1 inner ladder with heater 1 outer ladder with heater - IR transparent polycarbonate sheet covering - Dry air at ~ room temperature (20C) or cooled down with liquid N2 - IR pictures, Tipp-ex marks calibration Air flow (cooleddown with N2 <<-20C ?) Arantza Oyanguren 24 VI Jornadas sobre la participación española en Futuros Aceleradores Lineales

  25. Backup Polycarbonatecover (relatively IR transparent) Tipp-Ex marks (ε=0.95) Outerladder: properlycorrected (εeff ) Innerladder: effect of cover + air? Arantza Oyanguren 25 VI Jornadas sobre la participación española en Futuros Aceleradores Lineales

  26. Backup Air flow - heater Al laddersurface? innerladder Tipp-Ex Tipp-Ex Tipp-Ex Temperature (C) -1 C covereffect? T (C) x ladder outerladder covereffect? Tipp-Ex Air flow - heater Tipp-Ex Temperature (C) T (C) working cooling block Tipp-Ex bloqued cooling block -7 C x ladder Arantza Oyanguren 26 VI Jornadas sobre la participación española en Futuros Aceleradores Lineales

  27. Backup Arantza Oyanguren 27 VI Jornadas sobre la participación española en Futuros Aceleradores Lineales

  28. Cooling studies Effect of beam-pipe temperature on the inner layer - Cooling beam pipe with chiller - End flanges at room temperature (stainless steel) - Transparent polycarbonate dummies - Measure temperature on first layer with IR camera (calibrated with PT100s) 2 dummiesonouterlayer removed tohave IR accesstotheinnerlayer  Impact of several degrees on first layer (under these conditions) Arantza Oyanguren 28 VI Jornadas sobre la participación española en Futuros Aceleradores Lineales

  29. Backup Arantza Oyanguren 29 VI Jornadas sobre la participación española en Futuros Aceleradores Lineales

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