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2S Module Workshop, 30 Jan 2012 Module positioning and cooling contacts

2S Module Workshop, 30 Jan 2012 Module positioning and cooling contacts. The objectives Module positioning Module cooling contacts. The objectives. Module positioning: Sufficiently precise initial geometry (< 1mm overall) to ensure module overlaps.

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2S Module Workshop, 30 Jan 2012 Module positioning and cooling contacts

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  1. 2S Module Workshop, 30 Jan 2012Module positioning and cooling contacts • The objectives • Module positioning • Module cooling contacts Antti Onnela, CERN

  2. The objectives • Module positioning: • Sufficiently precise initial geometry (< 1mm overall) to ensure module overlaps. • High stability (<< 0.1 mm) to minimize calibration needs during operation. • Cooling contacts between module and cooling pipe: • Silicon T max: -20 ºC, or preferably -25 ºC. • ΔT (silicon sensor – coolant) must be ≤ 10 ºC • To avoid need for very cold coolant.Though, we face a major problem here as the current pipe insulation is designed for -25 ºC and tested to -20 ºC .But, the coolant would need to be -30ºC or lower ! • The available ΔT of 10 ºC splits roughly into • ΔT (within module) < 7 ºC • ΔT (module cooling contact – module support piece – pipe wall) < 2 ºC. • ΔT (pipe wall – fluid) < 1 ºC, which seems achievable with 2-phase CO2. • Develop and qualify tracker-wide common solutions, keeping in mind different module types (2S, PS, Stereo, Vertical 3D) + Barrel and End-cap geometries. ΔT: 5-7 ºC Antti Onnela, CERN

  3. Module positioning • In the present TK there is no common module positioning method • So, we have now a wider experience... Antti Onnela, CERN

  4. Module positioning: TIB Inputs from A. Basti / INFN Pisa Inserts with clearance Precision insert Slot insert Antti Onnela, CERN

  5. Module positioning: TEC Inputs from M. Wlochal / Aachen Antti Onnela, CERN

  6. Module positioning: TOB Antti Onnela, CERN

  7. And the net result with TK precision? Already after first cosmic runs the residuals with Track Based Alignment are at ~50um rms, and improve within 2008 to ~30um. Much better than what the mechanics can (reasonably) do! Antti Onnela, CERN

  8. Module positioning • Sufficient precision can be reached with the TIB & TEC methods • Smaller and lighter than the TOB method • Maybe a sufficient precision can be reached even without positioning pins?! • Precision screw + hole / slot ? • Counter sunk screw + 2 holes or 1 hole and 1 slot ? • Use module edge as guide reference ? • Are inserts needed on the module? • Captive screws (permanently with module) could be excellent to have. • Not fully obvious, due small dimensions  Tasks for 2012-2013: • Analyse the present TK results and set precision requirements for the upgrade TK. • Impacts the mechanics design from modules up to complete TK, as well as what needs to be done in terms of pre-alignment and measurements. • Produce test assemblies and measure their mechanical quality (precision, strength, ...). • Need sample materials/components for these tests ! Antti Onnela, CERN

  9. Module cooling contacts • Different variants of module cooling contacts were applied in the present TK • So, we have now a wider experience... Antti Onnela, CERN

  10. Module cooling: Present TK Support Antti Onnela, CERN

  11. Module cooling • Uncertainties in calculation inputs (composites, glues, joints)  measurements are necessary, though not fully obvious either (e.g. inputting of power load, availability of correct materials/components) • For the present tracker calculations and tests done mostly in 2000-2002 Antti Onnela, CERN

  12. Module cooling currently (TOB) • Coolant temperature: 5 - 6 ºC. • Module power loads: • FE-power ~ 0.45 W / APV • Silicon self-heating ~ 0.014W / module @ 5 fb-1,0.4W / module expected @ 500 fb-1 (10y LHC) • Silicon mean temp: 13 – 14 ºC • ΔT (silicon - coolant) = 7 – 9 ºC • Will grow to ~ 10 ºC due self-heating increase DS modules P = 3.6W SS6 modules P = 2.7 W SS4 modules P = 1.8 W Cooling segment #44TOB 1.3.1 (132 modules) off Plots by Christian Barth Antti Onnela, CERN

  13. Modulecoolingcontacts • Estimated power load in a 2S module: ~3.5 W (TOB: 1.8 – 4.4 W) • Following calculations (A. Mussgiller) and present TK experience ΔT (silicon – coolant) of 10 ºC seems reachable, but is not automatic! • 10 ºC easily ‘lost’ already within the module. • Good quality dry cooling contact can be sufficient • No need for thermal pastes. Avoid them, they are ‘dirty’ • But requires good planarity of the module and support contacts (no gaps, minimal stresses) • Even a small contact area is enough with these low powers, if the contact is good.  Tasks for 2012-2013: • Study the support/cooling contacts in the modules • Is aluminium the choice? Any other candidates? • Study the module support/cooling blocks. • Is aluminium the choice? Any other candidates? • Geometry and dimensions. Connection to cooling pipe. • Qualification of assembly glues and methods, for all mechanical/thermal contacts • Produce test assemblies and measure their thermo-mechanical performance. • Need sample materials/components for these tests ! Antti Onnela, CERN

  14. Thank you for your attention. Antti Onnela, CERN

  15. Spare slides Antti Onnela, CERN

  16. 2S module, Jan 2012 version 3D models by A. Conde Garcia / CERN Antti Onnela, CERN

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