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Cooled Carbon Support BTeV Pixel Detectors

Cooled Carbon Support BTeV Pixel Detectors. Development Recommendations for 2001 T R Knowles 3/7/01. FY00 Progress. Cooled carbon structure demo articles (full-scale) Lightweight Rigid Shingled surface Porous chip mount Al manifolds Issues Resistance at tube wall is high

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Cooled Carbon Support BTeV Pixel Detectors

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  1. Cooled Carbon Support BTeV Pixel Detectors Development Recommendations for 2001 T R Knowles 3/7/01

  2. FY00 Progress • Cooled carbon structure demo articles (full-scale) • Lightweight • Rigid • Shingled surface • Porous chip mount • Al manifolds • Issues • Resistance at tube wall is high • Need to increase thermal conductance • Tubing cracked, leaked • Need to increase toughness and assure leak-tightness Fibrous surface for shingling with high contact conductance Vertical high-k fibers with in-plane discrete fiber reinforcements Tubes cemented in grooves

  3. Increase Thermal Conductance • “Fintubing” Concept • Improved fiber orientation • Issues: Precision? Manifolds? • “Tubewall” Concept • Complete layer of tubing • Tubing height < 1 mm • Issues: Precision, Rigidity? Manifolds

  4. POCO graphite rod CVD POCO tube, (unreinforced – 8 ksi) Graphite Header Tubing • Sealed POCO graphite tube • Tube machined from POCO • Pyrocarbon CVD seal coat • Helium leak test • Light CVD seal reduced He permeation to <5e-9 mL/s (most sensitive scale on leak detector) • Expect heavier coat to seal even better (no helium leak signal) • Good candidate for headers • May reinforce with carbon braid to improve strength and toughness

  5. Tube Manifolding • Carbon carbon construction • Tubular elements • Large-gauge headers • Small-gauge lines • Carbon joining • Carbonize bonding resin • Seal by pyrocarbon CVD • Reinforcement options • Integral boss on graphite header for larger tube/header interface • Fabric reinforcements

  6. FY01 Task 1Review Issues and Options • THERMAL “fintube” and “tubewall” options • Fabricate small comparison articles • STRUCTURAL fibercore; carbon fiber frame • Fabricate small comparison articles • MANIFOLDING aluminum vs carbon • Fabricate carbon-carbon T-joint to test hermiticity • TOUGHNESS reliable tube/manifold connection • Fabricate stress-relieved joints with velvet or fabric

  7. FY01 Task 2Fabricate Prototypes • Fabricate two (2) Cooled-Carbon Supports • Incorporate design features selected from Task 1 • Assure leak-tightness by monitoring throughout fabrication • Mount on aluminum frames; attach inlet and outlet lines • Preliminary heat exchanger performance test at ESLI • Measure flow impedance • Measure heat exchanger performance • Theater - Tcoolant when symmetrically heated @ 1 W/cm2

  8. FY01 Task 3Superstructure Options • Work together with FNAL engineering to draft design of support superstructure based on • Lightweight sandwich structures • Carbon tubing • Carbon truss superstructures bulkheads carbon rod space frame

  9. Carbon Truss Structure Concept • Carbon sheet (100 µm) bulkheads • Carbon-fiber rods in tension • Carbon tubing & manifolds • Carbon fibercore thermal area

  10. Cost/Schedule

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