1. Proposed TF Joint Design Concept #1 C Neumeyer 3/23/9 Notes: 1)Several concepts included are based on ideas developed by R Woolley 2)No analysis has yet been performed to justify the design

4. Joint area ~ 2x inner leg conductor area after accounting for bolt

5. Bolts threaded into steel blocks within inner leg conductor allowing high force

6. Bolt in joint region located where J ~ 1/2 of peak value, peak J ~ same as main inner leg Load applied through shoe to distribute force Joint pressure due to bolt at joint region alone > 2ksi, ~ same as magnetic pressure

7. Gap between contact surfaces on flag ensures proper current flow region and causes outer bolts to contribute to pressure at electrical joint

8. One or more of the bolts should be shoulder bolts to react vertical force

9. All cross sections in direction of current flow equal to inner leg cross section to ensure equal temperature rise

10. G-10 fins embedded between turns over joint region and slightly beyond

11. Radial flag extension – Flag shape is constant tension to eliminate development of in-plane moments – Flag cross section equal to inner leg cross section – Flex section reduces transmission of moments to joint due to small in-plane and out- of-plane deflections and allows for some assembly tolerances – Flex section resiliant to TF forces, needs evaluation against bucking due to out-of-plane forces

12. In-plane flex joint – Two parallel sections with 50% fill factor maintain total cross section same as inner leg – Flex joint accomodates axial thermal growth, equally split top and bottom flex – Flex section resiliant to in-plane forces (won’t buckle)

13. Flag box – Flag wrapped in Kapton, close fitting to G-10 insulating blocks – Must accommodate thermal expansion in toroidal, vertical, and radial directions – Transmits in-plane load back to TF inner leg conductor via umbrella lid and bolting into turns – Transmits out-of-plane load to VV via umbrella lid

15. Flag box attachment ring –Connects flag boxes to umbrella lid

16. G-10 torque ring –Transmits torsional loads from inner leg to umbrella lid –Transmits vertical loads on radial flags to inner leg turns –Insulates individual turns from umbrella lid Umbrella lid –Transmits torsional loads from inner leg and out-of-plane loads on flags to VV –Shoulder bolts and belleville washers allow small axial expansion of inner leg bundle etc. w.r.t. VV, top and bottom

18. Variants to Concept 1 Replace bolts at joint with jacking ring Use threaded inserts instead of embedded blocks Add shear pin feature or make only one bolt a shoulder bolt More structure to eliminate cantilever of flag boxes Use fit-in-place adapators to join flag boxes to umbrella lid