1. University of Oxford, Department of Engineering Science, Osney Thermo-Fluids Laboratory, Southwell Building, Osney Mead, Oxfordshire OX2 0ES, United Kingdom
2. Culham Science Centre, Culham Centre for Fusion Energy, Abingdon, Oxfordshire OX14 3DB, United Kingdom
3. Rolls-Royce Plc., Atlantic House, P.O. Box 2000, Derby, Derbyshire DE21 7XX, United Kingdom