1 Outer Barrel, Phase 2 Mech Review 26 Aug 2013, indico: Antti Onnela, CERN Tracker Phase 2 Mechanics Review, 26 August 2013 Status of the Outer Barrel design This presentation bases on Outer Barrel design work and inputs during by Duccio Abbaneo, Giovanni Bianchi, Aleksis Chávez Niemelä, Antonio Conde Garcia, Jordan Degrange, Tristan Falcy, Alan Honma, Riikka Häsä, Luc Kottelat, Nick Lumb, Stefano Mersi, Andreas Mussgiller, Antti Onnela

2 Design concept Bases on re-using the current TOB design 1 support wheel Rods installed from the two ends Outer Barrel, Phase 2 Mech Review 26 Aug 2013, indico: Antti Onnela, CERN 2S module ~ 10 cm x 10 cm Rod with 2S modules ~ 120 cm x 15 cm Outer Barrel (3 layers) PS modules 2S modules

3 Design concept Outer Barrel, Phase 2 Mech Review 26 Aug 2013, indico: Antti Onnela, CERN 2S modules 4464 from 6” wafers [3776 from 8” wafers] Rod with 12 [or 8 / 16] 2S modules 372 (186 per end) [376 (188 per end)] Outer Barrel base-line with 6” wafer modules Outer Barrel 2 nd variant with 8” wafer modules

4 Design concept Outer Barrel, Phase 2 Mech Review 26 Aug 2013, indico: Antti Onnela, CERN 2S modules 4464 from 6” wafers [3776 from 8” wafers] Rod with 12 [or 8 / 16] 2S modules 372 (186 per end) [376 (188 per end)] In the old TOB, with 6 layers 5208 modules 688 rods (344 per end) Outer Barrel (3 layers)

5 Wheel + Rods Outer Barrel, Phase 2 Mech Review 26 Aug 2013, indico: Antti Onnela, CERN Wheel = 4 disks joined together by 3 inner and 3 outer cylinders Rods are half length of the barrel, with overlap in middle. Rods inserted from the two ends. Each rod supported by two disks.

6 Rod support and positioning Precision support inserts in the Disks 4 spherical contact surfaces in each rod Outer Barrel, Phase 2 Mech Review 26 Aug 2013, indico: Antti Onnela, CERN

7 Rod support and positioning Precision support inserts in the Disks 4 spherical contact surfaces in each rod Outer Barrel, Phase 2 Mech Review 26 Aug 2013, indico: Antti Onnela, CERN

8 Critical: Rod cross-sectional size Outer Barrel, Phase 2 Mech Review 26 Aug 2013, indico: Antti Onnela, CERN 4 mm more than in the old TOB, due DC- DC converters. Reducing converter height would be very useful to gain assembly clearances. C-profile needs to be 2 mm narrower than in old TOB, to make rod fit Just enough, but with no margin

9 Modules on the Rod Outer Barrel, Phase 2 Mech Review 26 Aug 2013, indico: Antti Onnela, CERN This version misses still the possibly needed 5 th cooling contact below the service hybrid

10 Critical: Module cooling In old TOB and our first upgrade studies: Cooling pipe on the outside of the Rod C-profile Now studying cooling pipe inside Rod C-profile, as close as possible to the modules. Tight space inside the Rod, but does not seem impossible. Geometrically different from the old version, strength of insert glue joints needs to be carefully re-studied. Outer Barrel, Phase 2 Mech Review 26 Aug 2013, indico: Antti Onnela, CERN

11 Cooling pipe next to the modules? Outer Barrel, Phase 2 Mech Review 26 Aug 2013, indico: Antti Onnela, CERN Thermally attractive. Very small clearances, but possibly enough. Cooling pipe diameter becomes critical. In this study pipe diameter 2.0 mm, target range 1.5 – 2.0 mm. Recent design idea, integration not proven yet.

12 Services arrangement Outer Barrel, Phase 2 Mech Review 26 Aug 2013, indico: Antti Onnela, CERN Power cables and optical fibres, two options: Connectors at the end of each rod. Services installed, connected and routed outwards after Rod installed inside the Wheel. Connectors inside the rod (at each module), rod installed with services pigtail, which need to be long enough to reach TK Bulkhead or PP1.

13 Cooling Outer Barrel, Phase 2 Mech Review 26 Aug 2013, indico: Antti Onnela, CERN Two rods in series gives “CO2-suitable” cooling circuits: 2 x 2.5 m = 5 m pipe length with mm pipe diameter. 84 W per line 186 lines in total (93 per end) 186 supply capillaries from manifolds at TK Bulkheads Return pipes (size?) to manifolds at TK Bulkheads. Alternative: Return manifolding at the TOB end. LayerL1L2L3 Totals # mod along phi mod/rod12 W/mod3.5 W/rod42 W one end W total

14 Next tasks with TOB design Verify the 3D integration with the ‘inside-Rod’ cooling pipe concept –Add 5 th cooling contact for each module. –Does everything fit correctly? Study more in detail the new type of module support/cooling inserts –Module positioning –Cooling performance, contact area to cooling pipe –Strength of the glue joints under thermal and mechanical loading Study the cooling pipework more in detail: pipe diameters, connections, manifolding. Outer Barrel, Phase 2 Mech Review 26 Aug 2013, indico: Antti Onnela, CERN

15 Outer Barrel design work in summary Strengths: Wide reuse of existing and proven solutions allows fast and efficient progress in the design, and helps a lot in the planning and cost estimates. Specific challenges: In order to fit in the Wheel the Rods can have only a limited thickness + width. –Dimensions of service board electrical and optical components are critical for success. Need to design and build strong, stable, and geometrically precise Rods. –We know how to do that, providing that the Rod design stays reasonably similar to the old one. Bigger changes will need more attention in the design and R&D phase. Efficient and reliable (!) cooling for every module. –Moving the cooling pipe inside the Rod is step towards improvements, but also adds space complications. –Cooling pipes and their connections must be of top quality, and of conservative design ‘not optimised for last gram’. Access to the Modules and Rods in the assembled Wheel is very difficult and time-consuming. –Assembled Rods must be rigorously pre-tested to minimize risks of later discovery of problems. Outer Barrel, Phase 2 Mech Review 26 Aug 2013, indico: Antti Onnela, CERN

16 Back-up slides Outer Barrel, Phase 2 Mech Review 26 Aug 2013, indico: Antti Onnela, CERN

17 Earlier studies (year 2012) Module + Rod integration –Tight clearances (like in the original TOB…), but seem solvable Module positioning concepts and precision. Thermal contacts between Modules and cooling pipe Mechanical properties of adhesives used in cooling pipe contacts. Adaptors for holding 2S modules on existing spare TOB rods. Outer Barrel, Phase 2 Mech Review 26 Aug 2013, indico: Antti Onnela, CERN Overlaps between modules and rods Size of DC-DC converter and optical link

18 Rod without modules Outer Barrel, Phase 2 Mech Review 26 Aug 2013, indico: Antti Onnela, CERN