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Cylinders or Space Frames ?

Cylinders or Space Frames ?. David Hitlin September 16, 2005. Alternatives to rohacell shells. Tensioned fibers (JA) Light carbon fiber space frame (DH) More material than naïve tension system, but more than shells Still much less than silicon+cables+cooling

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Cylinders or Space Frames ?

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  1. Cylinders or Space Frames ? David Hitlin September 16, 2005

  2. Alternatives to rohacell shells • Tensioned fibers (JA) • Light carbon fiber space frame (DH) • More material than naïve tension system, but more than shells • Still much less than silicon+cables+cooling • Should be very rigid and self-supporting • Facitates gas cooling • Permits use of lampshade endcaps • Used in BABAR vertex detector (much smaller scale) • Greatly reduces area of silicon to cover a given solid angle • Reduces multiple scattering by increasing average andle of incidence for charged particles • Facilitates access David Hitlin Sept. 16, 2005

  3. ALICE uses carbon fiber space frames http://f.home.cern.ch/f/feofilov/public/TDR-HTM/its1-1.htm David Hitlin Sept. 16, 2005

  4. David Hitlin Sept. 16, 2005

  5. An example configuration David Hitlin Sept. 16, 2005

  6. First shot at a 2D finite element analysis David Hitlin Sept. 16, 2005

  7. Components • Hollow tubes • Molded ferrules ………… David Hitlin Sept. 16, 2005

  8. Next • Optimize a 2D planar structure • Extend to a 3D cylinder and a conical endcap • Detail design • Mounting, handling of silicon modules • Potential integration of cooling into structural tubes • Cable routing • Mounting structures • Explore fabrication methods David Hitlin Sept. 16, 2005

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