Google says it's Inconel, - "The in-plane loads are carried from the covers to the cylinder by 96 INCONEL® 718 draw bars with a yield strength of 1 GPa." [0]

Google says it's Inconel, - "The in-plane loads are carried from the covers to the cylinder by 96 INCONEL® 718 draw bars with a yield strength of 1 GPa." [0] - "The wedged conductors are CD107 copper, bonded to flat Inconel 718 plates, with a 4:1 copper/reinforcement ratio over the central column area. The yield strength of the copper is 310 MPa, up to 100 °C, while the yield strength of the Inconel plates is 1130-1300 MPa. The peak Tresca stress on the Inconel at the inside radius is calculated to be 580 MPa, while that in the copper is 310 MPa." [1] [0] https://www-internal.psfc.mit.edu/research/alcator/data/fst_cmod.pdf https://www-internal.psfc.mit.edu/research/alcator/data/fst_... [1] https://dspace.mit.edu/bitstream/handle/1721.1/94967/87ja040_full.pdf https://dspace.mit.edu/bitstream/handle/1721.1/94967/87ja040...