4.5 K Paschen Qualification Testing of Terminal Joint and Voltage Tap Insulation Designs for ITER CS Module Test Facility

General Atomics (GA) is fabricating seven ITER Central Solenoid Modules (CSM) for the ITER Organization (IO). As part of the fabrication process, all CSMs undergo factory acceptance testing (FAT) prior to shipment to the IO. The FAT includes charging the modules to 40 kA and performing fast discharges (7.3 second decay time constant) to measure alternating current (AC) losses. These fast discharges generate high voltages at the electrical connections between the CSM and the test facility. Due to a fast discharge fault during the CSM 3 FAT, Paschenization methods of high voltage connections between the CSM and the test facility needed to be developed, qualified, and implemented. These connections included the coaxial and twinbox joints, all in-chamber instrumentation voltage tap wire splices, and voltage tap chamber feedthroughs. A test article was manufactured to replicate these connections and joints, and qualify the locally removable Paschenized insulation designs with a Paschen Test at 4.5 K. The 4.5 K Paschen test was comprised of 15 kV tests between 1E-03 and 1 mbar. This paper will present and discuss the Paschenization methods, lessons learned from research, and the CSM implementation in the test facility.