Non-destructive Examination on PF Butt Welds of ITER Superconducting Conductor

PF jacket which is round inside and square outside is one of the most important parts of ITER Tokamak device. Radiographic test is required to ensure its safety usage. But the special shape made test technology more difficult than ordinary jacket. We try to exposure six times and make rays source tilt fixed angle to solve the existing problem. The experiment results show this method can satisfy the test requirement on the PF butt welds and avoid density difference.