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Nuclear Science and Engineering
Fusion Science and Technology
Advanced reactors: Now comes the hard part
Designing a reactor is complicated but building one may be harder. Even companies that have had lots of practice haven’t always done it well. And all the power reactors in service today were built by companies that had years of experience in other kinds of big steam-electric power plants. In contrast, some of the creative new designs now moving toward commercialization come from start-ups that have never built anything at all. How should they prepare?
R. Ichiki, K. Hayashi, T. Kaneko, R. Hatakeyama (19P09)
Fusion Science and Technology | Volume 51 | Number 2 | February 2007 | Pages 241-243
Technical Paper | Open Magnetic Systems for Plasma Confinement | dx.doi.org/10.13182/FST07-A1362
Articles are hosted by Taylor and Francis Online.
The collisionless electron drift wave instability in a plasma involving sheared magnetic-field-aligned positive-ion flow and negative ion species has been experimentally investigated. Surveying wide ranges of the shear strength and of the negative ion exchange fraction, which was first made possible by our new apparatus mounted in a Q machine, reveals detailed characteristics of the instability. The kinetic dispersion relation suggests that the wave observed for positive shear is the current-driven shear-modified drift wave. However, for negative shear the wave exhibits peculiar behavior which cannot be directly interpreted by the linear local theory. We also found that negative ions tend to stabilize the instability.