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Inner Triplet System Functional Overview

Detailed review of the Inner Triplet system components and load transfer mechanisms as outlined in J. Kerby Reference Documents. Includes information on support requirements, tie bars, load reactions, and vacuum loads.

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Inner Triplet System Functional Overview

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  1. Integrated Systems J . Kerby

  2. Reference Documents • Inner Triplet FS (LHC LQX ES 0001 30 20) • Functional Overview • Component Manufacture • Machine Optics • Cryogenic System • Electrical Systems • Absorber systems 24-25 Inner Triplet Review - J Kerby

  3. Reference Documents • Inner Triplet FS points to: • Typically IS exists for each 24-25 Inner Triplet Review - J Kerby

  4. Reference Documents • LQXA Functional Spec 24-25 Inner Triplet Review - J Kerby

  5. Reference Documents • LQXA Interface Spec 24-25 Inner Triplet Review - J Kerby

  6. Assembly Procedures • Triplet Components installed IP end first, building out • Tunnel space, shielding, and detector interfaces limit access • Interconnects and end closures follow • Procedures initiated at FNAL; tuned / improved and translated after warm fit up experience 24-25 Inner Triplet Review - J Kerby

  7. Load Transfer • Alignment Requirements for the LHC Low-Beta Triplets (LHC-G-ES-0016, 2002). Main points concerning supports: • CERN supplies jacks, cups and other equipment for installation to the tunnel floor. • Lateral load specified as 1 ton • No reference to vacuum load (assumed taken up by the tie-rods). • Decision to use PMPS jacks for the inner triplets (2004?) • Jacks designed to take loads up to 8 tons • Specification for the motorization of the PMPS jacks (IT3200, 2004) • Lateral load specified as 1.3 tons • Anchor specification (date?) • Lateral load specified as 5 tons • All cases referred to assumed vacuum loading 24-25 Inner Triplet Review - J Kerby

  8. Load Transfer • Need for reaction of vacuum loads noted at Cryostat Conceptual Design review (1999) • An action item from the Cryostat Interim Design Review in 2000 • Concern on number of tie bars (2 to 3 recommened) • Concern on protruding into the aisle • Stability of tie rods under vacuum noted at Engr Design Review (2001) 24-25 Inner Triplet Review - J Kerby

  9. Load Transfer • Tunnel jacks assumed to take no load in shear for purposes of tie bars • Full Q1-Q2-Q3 vacuum load (~78kN) reacted through tie bars to DFBX and to ground 24-25 Inner Triplet Review - J Kerby

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  13. Load Transfer • 4 M30 tie bars at each interconnect • Vacuum bellows contribution excluded • In Q1-Q2 & Q2-Q3 interconnects stiffened at intermediate location • Stress in tie bars ~27MPa • Safety factor to buckling >6 for Q2-Q3 (longest) • System successfully tested in Bat 181 Apr 2005 • Measurements on deflections at ears during Apr 2005 corroborated by analysis 24-25 Inner Triplet Review - J Kerby

  14. Load Transfer • Ear deflection for vacuum load approx 0.52mm linearly scaled from Q1-Q2-Q3 model used for analyzing failure mode R = 467.4mm 0.1mm R = 525.8mm 0.1mm 42.7kN 1.14mm 24-25 Inner Triplet Review - J Kerby

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  16. Vacuum Loads • Measurements have also been taken in IR8R • Resonable agreement w/ calculation when including the stiffness of the jacks 24-25 Inner Triplet Review - J Kerby

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