Philip C. Michael is an 🏷️#engineer and a research scientist at the 📝MIT Plasma Science and Fusion Center whose subject is the 📝cryogenics that a 📝superconductor test depends on. He is first author of "A 20-K, 600-W, Cryocooler-Based, Supercritical Helium Circulation System for the SPARC Toroidal Field Model Coil Program" (DOI 10.1109/TASC.2023.3332266), published in IEEE Transactions on Applied Superconductivity in 2024 with fifteen co-authors and 📝Zachary Hartwig last.

The system that paper describes is what held the 📝Toroidal Field Model Coil (TFMC) at its operating temperature of roughly 20 kelvin: closed-cycle cryocoolers rather than a liquid-helium plant, circulating supercritical helium and removing 600 watts of heat. That choice matters beyond one magnet. 📝High-Temperature Superconducting (HTS) Magnets run warm enough that a cryocooler-based loop can serve them, which removes a large cryogenic plant from the cost of every test stand and, eventually, every machine. Michael is also second author of the companion paper on the test facility built around the coil, and his work sits alongside the rest of 📝The TFMC Engineering Papers. The coil his loop cooled reached 20.1 📝tesla peak field on conductor on September 5, 2021 — a measurement, not a projection; 📝SPARC's own magnet set and its plasma performance remain ahead.