1. Department of Astrophysical Sciences, Princeton University , Princeton, NJ 08544 , USA
2. Center for Computational Astrophysics, Flatiron Institute , 162 5th Avenue, New York, NY 10010 , USA
3. Princeton Plasma Physics Laboratory , PO Box 451, Princeton, NJ 08543 , USA
4. Department of Physics, University of Maryland , College Park, MD 20742 , USA
5. School of Natural Sciences, Institute for Advanced Study , 1 Einstein Drive, Princeton, NJ 08540 , USA