Cylinders or Space Frames ?
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Cylinders or Space Frames ?
David Hitlin
September 16, 2005
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David Hitlin Sept. 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
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http://f.home.cern.ch/f/feofilov/public/TDR-HTM/its1-1.htm
ALICE uses carbon fiber space frames
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An example configuration
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First shot at a 2D finite element analysis
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Components Hollow tubes
Molded ferrules
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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