1. Department of Physics and Astronomy, University of California 1 , Los Angeles, California 90095, USA
2. Institute of High Performance Computing, Agency for Science, Technology and Research (A*STAR) 2 , Singapore
3. Strathclyde University 3 , Glasgow, United Kingdom
4. NMC, A*STAR 4 , Singapore
5. Culham Centre for Fusion Energy, UKAEA 5 , Culham, United Kingdom