Development of U.S./ITER CS Model Coil Turn Insulation
For the international thermonuclear reactor (ITER), we developed a novel system for electrical insulation of the conductor turns. It consists of a tetrafunctional epoxy with an aromatic-amine cure preimpregnated in a satin-weave S-2 glass that is cowound with Kapton film. This preimpregnated system is fabricated into tape that is wound onto the conductor of each central-solenoid coil layer, cured, and inspected—an on-line process.
Extensive testing has demonstrated that this system is very radiation resistant. We measured the shear, shear/compression, compression, fatigue, thermal contraction, and dielectric strength properties at 77 and 4 K; at 77 K, we conducted large-scale compression-fatigue tests with intermittent turn-to-turn voltage-breakdown measurements of conductor arrays.
KeywordsDielectric Strength Insulation System Release Cloth Kapton Film Cryogenic Engineer
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