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This paper deals with bubble-triggered breakdown phenomena in cryogenic liquids of pool-cooled superconducting (SC) apparatus. The bubble observations and breakdown voltage measurements which were conducted by using various electrode configurations from the standpoint of practical insulation design approach in Kyushu University are reviewed briefly.
Non-uniform field gaps partially immersed in liquid coolants are essential components in any cryogenic or superconducting apparatus. We have investigated the dc, ac and impulse dielectric breakdown characteristics of non-uniform field gaps partially immersed in liquid nitrogen together with those completely immersed in liquid or cryogenic gaseous nitrogen. It is found that the Sumoto effect appears...
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