1. Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543, USA
2. General Atomics, P.O. Box 85608, San Diego,
California 92186-5608, USA
3. Department of Engineering Physics, University of Wisconsin-Madison, Madison, Wisconsin 53796, USA
4. University of California San Diego, 9500 Gilman
Dr., La Jolla, California 92093-0417, USA
5. University of Texas, Austin, Texas 78712,
USA
6. MIT Plasma Science and Fusion Center,
Cambridge, Massachusetts 02139, USA
7. University of California, Los Angeles, Los
Angeles, California 90095, USA