1. Japan Atomic Energy Research Institute Department of Reactor Engineering, Tokai Research Establishment Tokai-mura, Naka-gun, lbaraki-ken, 319-11 Japan
2. School of Engineering and Applied Science Mechanical, Aerospace, and Nuclear Engineering Department Los Angeles, California 90095
3. Argonne National Laboratory, Fusion Power Program Building 205, 9700 South Cass A venue, Argonne, Illinois 60439
4. University of California, Los Angeles School of Engineering and Applied Science Mechanical, Aerospace, and Nuclear Engineering Department Los Angeles, California 90095