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TJ-II:Turbulence: Difference between revisions
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In contrast with [[Neoclassical transport]], turbulent transport (assumed to be the cause of the experimental so-called "anomalous" component of transport) is not well understood. | In contrast with [[Neoclassical transport]], turbulent transport (assumed to be the cause of the experimental so-called "anomalous" component of transport) is not well understood. | ||
As a consequence, predictions of machine performance generally rely on rather crude scaling law techniques, rather than first-principles calculations. | As a consequence, predictions of machine performance generally rely on rather crude scaling law techniques, rather than first-principles calculations. | ||
Improving our understanding of turbulence is hard, due to (1) the complexity of fusion-grade plasmas (the presence of | Improving our understanding of turbulence is hard, due to (1) the complexity of fusion-grade plasmas (the presence of charged particles and magnetic fields make this into a much harder topic than fluid turbulence), (2) the enormous variety of plasma instabilities, and (3) the difficulty of diagnosing the plasma due to the hostile conditions inside the plasma. | ||
Our work on turbulence has focussed mainly on the analysis of edge Langmuir probe data, although some analysis was done on other types of data (e.g., reflectometry signals). A large effort was devoted to the development of new analysis techniques. | Our work on turbulence has focussed mainly on the analysis of edge Langmuir probe data, although some analysis was done on other types of data (e.g., reflectometry signals). A large effort was devoted to the development of new analysis techniques. | ||