Jack Richard Greenwood

Expertise Superconducting magnets for fusion energy (LTS and HTS).Superconducting magnet technology prototyping and testing.High-field measurements on superconductors with currents up to 100 kA.Critical currents in superconducting materials: flux pinning, Josephson junctions, and percolation theory. Beyond (p,q) models.Superconductors under strain. Current Work I joined the Swiss Plasma Centre's Superconductivity Group (SPC-SG) in 2023. The group is part of EPFL and it is physically located at the Paul Scherrer Institut in Villigen, Switzerland.  Our group hosts the world-unique SUpraLeiter Test ANlage (SULTAN) test facility. Over the last 30 years, superconducting magnet technologies for all of the major magnetic confinement fusion projects globally (ITER, Europe, US, China, Japan...) have been tested in SULTAN. Fusion magnet conductor qualification is a significant activity that our group undertakes on behalf of the whole fusion magnet community. As the lead SULTAN test scientist, I have been lucky enough to gain ownership of ~20 test campaigns in SULTAN for customers and collaborators from all over the world since joining SPC. Apart from SULTAN testing, I am also interested in developing superconducting magnets for fusion reactors and large test facilities, including designing my own prototypes to be tested in SULTAN. On these topics, in 2026, I expect to:Complete preconceptual electromagnetic and mechanical designs for the superconducting TF and CS coils of the EU-DEMO fusion power plant. A new, lower aspect ratio tokamak design was proposed by EUROfusion at the end of 2024.Develop fusion magnet technology prototypes and manufacturing strategies with industry, and assess current TRL's and MRL's (e.g., by overseeing the manufacturing of prototype react and wind Nb3Sn cables and then testing them in SULTAN).Work with industry and our in-house team of specialists to design and manufacture prototype cable, joint, and subsize coil samples for SPC´s upcoming EDIPO2 test facility, and then test them in SULTAN. The DC and AC performance of the technologies must be assessed under foreseen operational loads before the final manufacturing of the EDIPO2 magnet system can begin. EDIPO2 will supersede SULTAN's capabilities in all aspects, and provide a qualification route for the next generation of fusion magnet technologies, that will hopefully be found in the world's first fusion power plants in the coming decades. The commissioning of EDIPO2 will take place in 2028. I have been active in applied superconductivity and fusion through various roles over the last decade, gradually moving from the experimental and microscopic physics of superconducting LTS and HTS materials for fusion, through to the large-scale R&D (design and analysis, manufacturing and testing) of fusion magnet technologies: Before joining SPC-SG, I worked at the UK Atomic Energy Authority, developing superconducting Remountable Magnet Joint (RMJ) technologies and test facilities for the UK's Spherical Tokamak for Energy Production (STEP) project. Superconducting RMJ's were first conceptualised nearly half a century ago, but they have yet to be demonstrated in a fusion device. Key successes included a granted patent on RMJ technology, the development of the organisation's first superconductor test facility ("ELSA"), and joint designs for the STEP conceptual design.Before that, I did a PhD in applied superconductivity at Durham University. My work there was focused more on the materials/condensed matter physics aspects of superconductivity for fusion, and included some detailed high field, high current, cryogenic measurements on superconducting tapes and strands, that required the development of novel cryogenic apparatus. The purpose was to try to determine the current carrying capacities (critical currents) of state-of-the-art LTS and HTS under 1D and 2D strain, and what microstructural properties could be changed to improve their performance. Most significantly, I showed the breakdown of the decades-old, ubiquitous flux pinning scaling laws for the critical current in state-of-the-art HTS, and proposed a new framework for understanding current flow at criticality, based on Josephson junctions, that included the wave-particle nature of the superelectrons in the materials. Education Master of Physics (MPhys) | 1st Class Hons. 2012 – 2016 University of Durham, UK Directed by Damian Hampshire Doctor of Philosophy - Physics | Thesis title: "Percolative Current Flow through Anisotropic, High-Field Superconductors under Strain" 2016 – 2023 University of Durham, UK Directed by Damian Hampshire Professionals experiences Magnetics and Superconductors Engineer STEP fusion power plant remountable HTS magnet joint technology and test facility ("ELSA") development.  2021–2023 UK Atomic Energy AuthorityDevelopment Engineer A collaborative project in the R&D/technology department of Siemens Healthineers Magnet Technology. Siemens are the world's leading producer of superconducting magnets for MRI scanners and are based in Oxford, UK.Funding was obtained after submitting a project proposal to EPSRC's Fusion Centre for Doctoral Training. 2018–2018 Siemens HealthineersResearch Technician A placement in the European Fusion Reference Laboratory, that inspired me to choose a career in applied superconductivity. The lab in Durham was tasked with performing approximately 13,000 measurements on superconducting strands for the ITER fusion reactor's superconducting magnets. My responsibilities included the daily operation of a 17 T superconducting magnet system, performing transport measurements of the critical current on Nb3Sn and Nb-Ti superconducting samples in high fields, and preparing the samples for measurement. 2015–2015 European Fusion Reference Laboratory (Durham University)