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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?
V. Sokolov, A. K. Sen (18R14)
Fusion Science and Technology | Volume 51 | Number 2 | February 2007 | Pages 100-102
Technical Paper | Open Magnetic Systems for Plasma Confinement | dx.doi.org/10.13182/FST07-A1325
Articles are hosted by Taylor and Francis Online.
A series of basic transport physics experiments on the anomalous ion thermal conduction due to ion temperature gradient instabilities are performed in Columbia Linear Machine. The CLM results like most tokamak experimental data results indicate dependence of the ion thermal conductivity on the isotopic mass close to [perpendicular] ~ Ai-0.5, i.e., inverse gyro-Bohm, where Ai is the mass number of the isotope of hydrogen. This is in stark contradiction to most present theoretical models predicting Bohm (Ai0) or gyro-Bohm (Ai0.5) scaling.We now report another series of experiments designed to explore the physics basis of this scaling which appears to lead to a new model for this scaling based on 3-wave coupling of two ion temperature gradient radial harmonics and an ion acoustic wave. The resulting isotopic scaling of transport is ~ Ai-0.5 dictated primarily by the ion acoustic damping. This basic physics is deemed to be extrapolatable to other experiments resolving the paradox and is tantamount to new paradigm for plasma turbulent transport.