HTS Quadrupole for FRIB—Design, Construction and Test Results

This paper presents the outcome of significant magnet R&D that was started over a decade ago towards solving one of the most critical issues in the design of the Facility for Rare Isotope Beams (FRIB) and resulted in the successful demonstration of a full size prototype HTS quadrupole for the fragment separator region. This magnet will be subjected to unprecedented radiation and heat loads. An HTS quadrupole, with more than a 12 K margin over the nominal 38 K operating temperature, provides a unique solution. After briefly presenting the design and construction, the test results will be discussed in more detail. An advanced quench protection system was able to protect the magnet against an accident which caused thermal run away (or quench) is also discussed. The magnet uses a significant amount of HTS from two leading manufacturers. The successful demonstration should encourage the use of HTS magnets where one must deal with a large amount of radiation and/or energy deposition.