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Global support structures

Global support structures. Overall support hierarchy. Inner tracker within one TE (thermal, humidity and Faraday cage), integrated on surface OC supported on 4 pts Strip ECs and pixels supported on rails (4pt) Barrel strip connection to OC to be defined (likely fixed around perimeter)

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Global support structures

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  1. Global support structures

  2. Overall support hierarchy • Inner tracker within one TE (thermal, humidity and Faraday cage), integrated on surface • OC supported on 4 pts • Strip ECs and pixels supported on rails (4pt) • Barrel strip connection to OC to be defined (likely fixed around perimeter) • 2 pixel support tubes (gas barrier) • Outer pixel support tube could be the inside of barrel and EC strip structure • Pixel structure and or PSTs will provide overall axial stiffness

  3. Outer cylinder (OC) and TE • Present concept is 30mm thick sandwich (T300 + Nomex core) • Based on CMS tracker support tube design • Not optimized for space/material • This also contains the central inner polymoderator • TE (heater+insulator) in panels on inside of OC • In barrel section also inner cooling layer • Cylinder stiffness from structural bulkheads • Access to inside of tracker requires external hoop

  4. (Tentative) outer envelopes • Still need to see what we can achieve

  5. Barrel strips • Structure based on cylinders • Sandwich (as SCT), or • Single skin with stiffening rings • To some extent driven by decision on stave mount system • Interlinks • Discrete (~8) interlinks (as SCT), or • Continuous (1 per stave) • Have not gone beyond concepts (design and FEA)

  6. Endcap strips • 2 concepts have been studied for 5-disk layout • Disk based (staggered petals), and • Space-frame (fan) • Implications of 7-disk layout not yet studied

  7. Pixels • 2 packages in 2 support tubes • Inner two barrel layers • Clam-shell • Either split at z=0 or services to one end • Outer two barrel layers + disks • Probably separate packages during integration • Outer support tube could be inner surface of strip structures • Support tubes need to be hermetic (not necessarily structurally) • Crude envelopes have been assigned

  8. Summary • We do have conceptual ideas for all our structures • There is insufficient effort to drive these concepts to a more mature stage

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