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HFT PIXEL Mechanical Progress

HFT PIXEL Mechanical Progress. Strasbourg June-2009 Wieman. Topics. Thin support beam ladder fabrication Air cooling analysis Air vibration tests Full scale cooling tests Spatial mapping. Eric Anderssen and Tom Johnson have been working on fabrication methods for: Sector Beam

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HFT PIXEL Mechanical Progress

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  1. HFT PIXEL Mechanical Progress Strasbourg June-2009 Wieman

  2. Topics • Thin support beam • ladder fabrication • Air cooling analysis • Air vibration tests • Full scale cooling tests • Spatial mapping

  3. Eric Anderssen and Tom Johnson have been working on fabrication methods for: Sector Beam and Ladders Produced sample beams, 244 m thick, 7 ply, 21 gm expected ladder mass 7.5 gm Development of sector beam and ladder fabrication ladders sector beam

  4. prototype design being built

  5. PIXEL mass breakdown

  6. Sector structures

  7. ladder fabrication and tooling

  8. ladder fabrication and tooling

  9. ladder fabrication and tooling finalizing mechanical designs and developing rapid production methods

  10. ladder fabrication and tooling ladder with silicon heater chips (50 m thick)

  11. wire bonding 50 m silicon to flex PC vacuum chuck to secure flex and silicon flat against solid surface to remove bounce Any bounce then no bond Good News after a couple of minor modifications to the vacuum chuck wire bonding works well

  12. (designed to allow ladder replacement) ladder to sector bond fixture ladder to out2 bond fixture.SLDASM

  13. ladder to sector tooling fixtures (4 stations)

  14. Air cooling of silicon detectors – Computational Fluid Dynamics (CFD) analysis • Silicon power: 100 mW/cm2 (~ power of sunlight) • 240 W total Si + drivers air flow path – flows along both inside and outside surface of the sector

  15. Air cooling – CFD analysis stream lines with velocity • air flow velocity 9-10 m/s • maximum temperature rise above ambient: 12 deg C • sector beam surface – important component to cooling • dynamic pressure force 1.7 times gravity 430 mm ID silicon surface temperature velocity contours

  16. vibration modes – preliminary – better composite numbers available 224 Hz 348 Hz 229 Hz 473 Hz 316 Hz

  17. The message Lots of complicated modes close in frequency End cap raises frequencies a bit vibration modes with reinforced end cap 259 Hz 441 Hz 276 Hz 497 Hz 397 Hz

  18. wind tunnel setup to test vibration and displacement carbon fiber sector beam capacitance vibration probe two positions shown air in air out adjustable wall for air turn around air velocity probe two positions shown C:\Documents and Settings\Howard Wieman\My Documents\aps project\mechanical\PXL phase 1 sept 2008\sector ph1 wind tunnel.SLDASM

  19. wind tunnel, rapid prototype parts from model air flow control parts built with 3D printer parts built with SLA, stereolithography apparatus

  20. wind tunnel

  21. capacitive probe vibration measurements air velocity 2.7 m/s position signal, 25 m/volt log FFT, peak at 135 Hz air velocity 9.5 m/s position signal, 25 m/volt

  22. Ladder vibration induced by cooling air system resolution limit all errors desired vibration target required air velocity 18 mph

  23. Full sized cooling tests 9 inch diameter tube mocks up MSC Thermal camera window not shown > 300 CFPM air flow for verification of cooling capability dust collector for air supply Cooling tests will begin as soon as prototype sectors completed

  24. Bob Connors Spiros Margetis Yifei Zhang development of spatial map procedure 10 gm touch probe force (could deflect beam) touch probe 2-3 m (xyz) and visual 2-3 m (xy) 50 m (z) active volume: huge We need better fiducials on the main pad side that the coordinate machine can find automatically. The pads will be buried and not visible MEMOSTAR3, 30 m pitch

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