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TJ-II:Turbulence: Difference between revisions
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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. | 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 [[TJ-II:Langmuir Probes|Langmuir probe]] data, although some analysis was done on other types of data (e.g., [[TJ-II:Reflectometry|reflectometry]] signals). Much effort was devoted to the development of new analysis techniques. | Our work on turbulence has focussed mainly on the analysis of edge [[TJ-II:Langmuir Probes|Langmuir probe]] data, although some analysis was done on other types of data (e.g., [[TJ-II:Reflectometry|reflectometry]] signals). Much effort was devoted to the development of new [[data analysis techniques]]. | ||
=== Bicoherence and wavelets === | === Bicoherence and wavelets === | ||
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<ref>J.A. Alonso et al, ''Impact of different confinement regimes on the two-dimensional structure of edge turbulence'', [[doi:10.1088/0741-3335/48/12B/S44|Plasma Phys. Control. Fusion '''48''' (2006) B465]]</ref> | <ref>J.A. Alonso et al, ''Impact of different confinement regimes on the two-dimensional structure of edge turbulence'', [[doi:10.1088/0741-3335/48/12B/S44|Plasma Phys. Control. Fusion '''48''' (2006) B465]]</ref> | ||
<ref>D. Carralero et al, ''Turbulence studies by fast camera imaging experiments in the TJII stellarator'', [[doi:10.1016/j.jnucmat.2009.01.140|J. Nucl. Mat. '''390-391''' (2009) 457]]</ref> | <ref>D. Carralero et al, ''Turbulence studies by fast camera imaging experiments in the TJII stellarator'', [[doi:10.1016/j.jnucmat.2009.01.140|J. Nucl. Mat. '''390-391''' (2009) 457]]</ref> | ||
See also: [[TJ-II:Fast camera]]. | |||
=== Causality detection === | |||
To disentangle the complex relation between fluctuating variables, a technique for [[Causality detection]] has been used. | |||
<ref>B.Ph. van Milligen, G. Birkenmeier, M. Ramisch, T. Estrada, C. Hidalgo, and A. Alonso, Causality detection and turbulence in fusion plasmas, [[doi:10.1088/0029-5515/54/2/023011|Nucl. Fusion '''54''' (2014), 023011]]</ref> | |||
It has revealed that magnetic fluctuations may play an important role in the [[H-mode|L-H transition]]. | |||
<ref>B.Ph. van Milligen, T. Estrada, B.A. Carreras, E. Ascasíbar, C. Hidalgo, I. Pastor, J.M. Fontdecaba, R. Balbín, and the TJ-II Team, The causal impact of magnetic fluctuations in slow and fast L–H transitions at TJ-II, [[doi:10.1063/1.4958807|Phys. Plasmas '''23''' (2016) 072305]]</ref> | |||
== References == | == References == | ||
<references /> | <references /> | ||