低温工学
Online ISSN : 1880-0408
Print ISSN : 0389-2441
ISSN-L : 0389-2441
超臨界ヘリウムの直流絶縁破壊電圧特性
不平等電界
中山 茂雄伊藤 大佐
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ジャーナル フリー

1983 年 18 巻 6 号 p. 308-316

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This paper describes the results of an experimental study on d.c. breakdown voltage characteristics on supercritical helium under the non-uniform electric field to assist the development of superconducting magnets cooled by supercritical helium.
At a certain value of the density, ρc, a maximum breakdown voltage is observed in the breakdown voltage versus density characteristics. In the case of negative needle, the breakdown voltage is proportional to the density ρ below ρc.
When ρ>ρc, the breakdown voltage becomes almost independent of the density. The ρc v.s. temperature curve, obtained from the measurements at different temperatures, agrees well with a pseudo-critical line, which is the phase transition line between pseudo-gas and pseudo-liquid phase of supercritical helium. It is pointed out that the breakdown mechanism supercritical helium in pseudo-liquid phase is defferent from the mechanism in pseudo-gas phase.

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