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The development of higher‐performance composite insulation systems for use in superconducting and fusion magnets has been an ongoing goal for the magnet community for many years. Next Step Option fusion devices will require insulation that can withstand higher temperatures and higher radiation doses, while still requiring performance at cryogenic temperatures. To address this need, Composite Technology Development, Inc. developed cyanate‐ester‐based composite insulation systems designed to provide improved radiation resistance, higher operating temperatures, and similar cryogenic performance as compared to conventional epoxy‐based insulation materials. This paper will discuss the fabrication and performance of cyanate‐ester‐based composite insulation systems produced using vacuum pressure impregnation, pre‐impregnation (i.e., pre‐preg), and high‐pressure lamination processes. Mechanical test data for tension, compression, and shear properties at 76, 295, and 373 K; dielectric breakdown testing at 76 K; and thermal expansion measurements from 76 to 373 K are presented. Results show that several cyanate‐ester‐based composite insulation materials exceed the required mechanical performance necessary to perform at the higher operating temperatures expected in future fusion devices. |
