Ceramic Composite Mandrel Preforms for LTS and HFS Magnets

This project will develop novel ceramic insulator preforms for use in accelerator and fusion magnets. The resulting ceramic insulators would replace current metallic parts and would the ease fabrication of complex magnet designs, significantly reducing manufacturing costs. The new material will have a thermal expansion closely matching the superconductor, allowing it to withstand high mechanical loads at cryogenic temperatures. In addition, the new insulators will be radiation resistant and will be capable of surviving high temperature heat treatments. Phase I will focus on formulating ceramic compounds that can be shaped and molded into appropriate dimensions to produce coil formers and preforms. Two different ceramic-based compositions will be examined. Process modifications will improve the flow and formability of the materials. Characterization will include strength measurement, thermal expansion, dimensional control, and compatibility with melt-processed Bismuth-based superconductors. Commercial Applications and other Benefits as described by the awardee: The ceramic insulators are expected to be robust and more reliable than current materials used in high-field accelerator and fusion magnet systems. These insulators will lower the magnet production cost by facilitating coil winding, which will help enable future accelerators to be constructed within budgetary restrictions. Commercial magnets could also benefit from molded insulator components, increasing their reliability at lower cost.