Commissioning Tests of Tokamak JT-60SA (Chronicle)

The authors of our journal repeatedly expressed concern about the large number of accidents (electrical breakdowns) occurring at electrical, diagnostic, and cryogenic inputs into forcibly cooled superconducting magnets of fusion installations. However, the need for efficient measures for improving the reliability of the electrical insulation of these inputs, at least until last year, was ignored. In 2021, during the launch tests of Japanese-European tokamak JT-60SA, another accident occurred with an electrical breakdown at the electrical and diagnostic input into the tokamak, which, according to the project managers, would delay the launch of the tokamak by about 15 months.