Innovative high-pressure laminate insulation for fusion magnets

Abstract

High-pressure laminate (HPL) composite materials, such as G-10, have been used for many years in both the electrical and magnet industry as insulation for demanding applications. Because of their relative ease of fabrication and ability to be inspected prior to magnet installation, these materials have remained an attractive insulation option for current magnet designers. However, composite insulation for use in many new Next Step Option (NSO) fusion devices must meet an increasingly demanding set of requirements, including cryogenic and elevated temperature performance while withstanding higher radiation levels. The lack of performance in high radiation environments by materials such as G-10 has led Composite Technology Development, Inc. (CTD) to develop a series of new, innovative HPL insulation systems that can meet the new fusion magnet challenges. Material development has focused on highly radiation-resistant resin systems, as well as lower radiation resistant, low cost alternatives. Prototype laminates have been fabricated and evaluated by a leading industrial partner to ensure their suitability for large-scale production. This paper will present several new insulation systems capable of being fabricated in the HPL process, provide processing characteristics, along with mechanical and electrical property data.