1. Proposed TF Joint Design C Neumeyer 2/26/9 Notes: 1)Several concepts included are based on ideas developed by R Woolley 2)No analysis has yet been performed to justify the design

3. Features (1) Bolted lap joint inner leg to vertical flag –Joint area ~ 2x inner leg conductor area after accounting for bolt –Bolts threaded into steel blocks within inner leg conductor allowing high force –Bolt in joint region located where J ~ 1/2 of peak value, peak J ~ same as main inner leg –Bolt in joint region applies load through shoe to distribute force –Joint pressure due to bolt at joint region alone > 2ksi, ~ same as magnetic pressure –Gap between contact surfaces on flag ensures proper current flow region and causes outer bolts to contribute to pressure at electrical joint –Shoulder bolts serve to react vertical force, requires high precision machining or special bolt concept –Flag cross section equal to inner leg cross section –G-10 fins imbedded between turns over joint region and slightly beyond

4. Features (2) 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 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)

5. Features (3) 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 Flag box attachment ring –Connects flag boxes to 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 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

6. Basis (1)

7. Basis (2) 1” joint width Joint area 1.5x inner cond csa 0.5” bolt at ~ 20ksi ~ 3ksi bolting pressure ~ 3ksi magnetic pressure