Estimation of the lifetime of resin insulators against baking temperature for JT-60SA in-vessel coils

• Published in: Fusion engineering and design Vol. 98-99; pp. 2076 - 2079
• Main Authors: Sukegawa, Atsuhiko M., Murakami, Haruyuki, Matsunaga, Go, Sakurai, Shinji, Takechi, Manabu, Yoshida, Kiyoshi, Ikeda, Yoshitaka
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.10.2015
• Subjects: Baking; Bismaleimides resin; Coils; Cyanate ester epoxy resin; Cyanate ester resin; Esters; Insulators; JT-60SA in-vessel coils; Lifetime; Polymers; Resins; Thermal endurance; Thermal resistance; Water cooling; Cyanate ester resin; Cyanate ester epoxy resin; Lifetime; JT-60SA in-vessel coils; Bismaleimides resin; Thermal endurance
• ISSN: 0920-3796; 1873-7196
• DOI: 10.1016/j.fusengdes.2015.06.018

•The lifetime of resin insulators at about 200°C was estimated.•We make use of the Arrhenius plot by the Weibull analysis for the estimation.•A suitable temperatures for the in-vessel coils were discussed. In the present study, the thermal endurance of epoxy-based, bismaleimides, and cyanate ester resins for the current design of the in-vessel coils was measured by performing acceleration tests to assess their insulation properties using the thermal endurance defined by the International Electrotechnical Commission (IEC-60216 Part1–Part 6) for a minimum of 5,000h in the 180–240°C temperature range. It was found that none of the resin insulators could tolerate the baking conditions of 40,000h at ∼200°C in the JT-60SA vacuum vessel. Therefore, the design of the in-vessel coils, including the error field correction coils (EFCC), was changed from the type without water cooling to with water cooling on JT-60SA.