Development of new radiation-resistant magnets using Cyanate ester resins

We have been developing radiation-resistant warm magnets insulated by a Cyanate ester resin. We developed a glass fiber cloth prepreg tape using Cyanate-ester pre-polymers supplied by Mitsubishi Gas Chemical Corporation INC. The high voltage breakdown test on the cured prepreg samples showed good insulation performance of our Cyanate-ester prepreg. We also developed a Cyanate-ester putty to use in a coil molding. In order to evaluate the radiation hardness, we prepared cured resin samples of Cyanate ester, Bismaleimide-Triazine (BT), and epoxy resins, and performed a tensile test after the proton beam irradiation. The 70 MeV proton beam was irradiated to the resin samples up to 10⁹ Gy at Cyclotron and Radioisotope Center, Tohoku University. The result of the tensile test showed that the radiation resistance of the Cyanate ester resin was almost same as that of the BT resin and more than 10 times higher than that of the epoxy resin. (author)