1. Tech-X Corporation, Boulder, Colorado 80303, USA
2. Department of Physics, Lehigh University, Bethlehem, Pennsylvania 18015, USA
3. National Fusion Research Institute, Daejeon, 305-333, Republic of Korea
4. Princeton Plasma Physics Laboratory, Princeton, New Jersey 08540, USA
5. MIT Plasma Science and Fusion Center, Cambridge, Massachusetts 02139, USA
6. General Atomics, San Diego, California 92121, USA