Fabrication of the Alcator C-MOD ohmic heating coil and coaxial bus

Several items of importance emerged in the fabrication of the Alcator C-MOD OH (ohmic heating) coil system and the OH coax. The yield strength of the full hard OH conductor did not consist of the scarf joints. Using Kapton tape as insulation for large conductors makes winding the coil easier because of its strength, elongation, and insulation properties. Of note was the technique of winding on Teflon-coated steel strips and then removing the strips after winding and potting to create a freely moving assembly trapped on the TF core. The cutting of the v-slot in the conductor at terminal plate to equalize the load distribution was also of significance, as was the excellent high-voltage insulation provided by vacuum bagging and making parts from B-stage epoxy/glass in an autoclave. Bending a large diameter solid coax 90° while maintaining its electrical integrity was also noteworthy