Electrical testing of large scale IR&D dummy coil for TPX magnet insulation design verification

Electrical test results are reported characterizing the dielectric properties, insulation capability, and equivalent circuit parameters of a 1.8 m OD, 24 turn IR&D dummy coil built by the Westinghouse TPX Team to address magnet coil manufacturing issues and to verify electrical insulation design for TPX PF and TF magnet coils. Induced voltage tests at 77 K were performed at the National High Magnetic Field Laboratory (NHMFL) to 200 V per turn without dielectric failure. High voltage testing was performed at Everson Electric under room temperature factory conditions. The coil turn insulation was surge tested to 21 kV without failure. The coil groundwall insulation was hipot tested up to 58 kV with 48 kV minimum withstand to the imbedded groundplane screen electrode. The coil was sectioned and examined for insulation impregnation quality and manufacturing tolerances.