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Si Upgrade - Mechanics

Si Upgrade - Mechanics. Review of Hytec study Mounting scheme Services. Hytec - material selection. Material for the support structure was selected on the basis of:. High radiation length Low density High stiffness Availability. Materials considered: Cons:. GFRP

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Si Upgrade - Mechanics

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  1. Si Upgrade - Mechanics • Review of Hytec study • Mounting scheme • Services . Si upgrade workshop, 9 June 2003 - Hubert van Hecke

  2. Hytec - material selection Material for the support structure was selected on the basis of: • High radiation length • Low density • High stiffness • Availability Materials considered: Cons: • GFRP • Beryllium • Carbon-Carbon • Aluminum Availability, thermal expansion Usually used for thermal apps. Strength, thermal expansion, density, RL . Si upgrade workshop, 9 June 2003 - Hubert van Hecke

  3. material - cont’d GFRP - graphite fiber - epoxy composite: which fiber? Choose one based on cost, availability. M55J . Si upgrade workshop, 9 June 2003 - Hubert van Hecke

  4. strength analysis Different structures were tried…. … and analyzed for strength. Dumbbell shapes have low bending strength. Choose single-barrel shape. . Si upgrade workshop, 9 June 2003 - Hubert van Hecke

  5. build in sections Atlas Si detector 3 sections, bolted together Endcap frame . Si upgrade workshop, 9 June 2003 - Hubert van Hecke

  6. cooling Based on the experiences with the Alice and Atlas cooling designs • Negative pressure system • Water-methanol • CFC evaporative • CFC single-phase And the lower total load (~2.2kW), and the lower power density (0.1-0.7 W/cm ) choose single-phase CFC 2 Run C6F14 or C5F12 at modest overpressure . Si upgrade workshop, 9 June 2003 - Hubert van Hecke

  7. cooling - cont’d Endcaps are cooled by tubes embedded in the support sandwich. Barrels are cooled with carbon-Carbon thermal plane with ‘Omega’ structure. . Si upgrade workshop, 9 June 2003 - Hubert van Hecke

  8. mounting scheme TPC/HBD mounts from the top CM yoke. The Silicon detector comes in from the bottom, much like the MVD does now. Translate or clamshell? . Si upgrade workshop, 9 June 2003 - Hubert van Hecke

  9. side view - services Power, cooling and signal services are brought in at both ends, using the entire perimeter. . Si upgrade workshop, 9 June 2003 - Hubert van Hecke

  10. services - power Power: at 0.1W/cm for 1.8V technology 2 Disk r power(W) Current(A) 1 10.5 32 18 2 14.1 60 33 3 18.0 100 56 4 18.0 100 56 Total: 163A If the voltage drop over 100’ is 1%, then this can be delivered via copper cable if the area is 28cm . Total for barrel + 2 endcaps: 190 cm of copper. 2 2 . Si upgrade workshop, 9 June 2003 - Hubert van Hecke

  11. services - cooling Count tubes on various drawings. 128 tubes for 2 endcaps, bundle 9/cm 14 cm total 2 2 1/2 of one endcap Assume a similar area for the barrel [ air cooling -> more area ] . Si upgrade workshop, 9 June 2003 - Hubert van Hecke

  12. services - fibers Assume 1 fiber per ladder for the barrel, 2 per ladder for the endcaps: Barrel 86 cables = 16.9 cm Endcaps 64/end = 12.5 cm Total for fibers: 42 cm 2 2 2 . Si upgrade workshop, 9 June 2003 - Hubert van Hecke

  13. services - how much space Assume that services (power, air, liquid coolant, copper and fiber are brought in on both ends, using the entire perimeter at r=20cm. total area dz per end From ‘first principles’ 352 cm 1.4cm Current MVD: ~50% of perimeter 940 cm 2.5cm Rule-of-thumb from Veljko Radeka: 12% of Silicon area (Atlas) 1444 cm 5.7cm 2 2 2 . Si upgrade workshop, 9 June 2003 - Hubert van Hecke

  14. to be studied For the next round, technology choices need to be pinned down • Power distribution - local voltage conversion,mass issues • Cooling - can some be done with air? • Keep an eye on integration . Si upgrade workshop, 9 June 2003 - Hubert van Hecke

  15. future Our progress-to-funding ratio compares favorably with industry standards Our progress-to-manpower ratio compares favorably with industry standard. . Si upgrade workshop, 9 June 2003 - Hubert van Hecke

  16. services . Si upgrade workshop, 9 June 2003 - Hubert van Hecke

  17. - . Si upgrade workshop, 9 June 2003 - Hubert van Hecke

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