1. Oak Ridge Institute for Science Education, Oak Ridge, Tennessee 37830-8050, USA
2. General Atomics, P.O. Box 85608, San Diego, California 92816-5608, USA
3. Princeton Plasma Physics Laboratory, P.O. Box 451, Princeton, New Jersey 08543-0451, USA
4. Plasma Research Laboratory, Research School of Physical Sciences and Engineering, The Australia National University, Canberra, Australian Capital Territory 0200, Australia
5. Columbia University, 2960 Broadway, New York, New York 10027, USA
6. Culham Centre for Fusion Energy, Culham Science Centre, Abingdon, Oxfordshire OX14 3DB, United Kingdom
7. Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831, USA