High Voltage Test of ITER Feeder Components Under Paschen Condition

As an important method of quality confirmation for the ITER Feeder system insulated components, high voltage test at Paschen condition need to be carried out once after these components are manufactured. The Paschen test is much more efficient for detecting the micro cracks or defects in solid multi-composite high polymer insulation materials than the conventional high voltage test done in atmospheric condition, and almost without any damage for the qualified components. For this purpose and the task agreement of Feeder R&D with ITER IO, a cryogenic vacuum Paschen test facility, which was modified by the Feeder prototype of Coil Termination Box (CTB), was established in ASIPP (China) in October of 2010, it is suitable to test typical critical high voltage components in Feeder, such as S-bend busbar, superconducting joint, and current lead. The test voltage can be up to 30 kV and provide pressure lower than 10^-3. This paper describes the detailed configurations of the insulation mock-ups for Feeder and the test facility, also presents and discusses the test procedure and results acquired up to now.