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LNF: (2022-2024) Estudio experimental de flujos, turbulencia y modos MHD, y su impacto en confinamiento en los stellarators TJ-II y W7-X: Difference between revisions

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TJ-II is the flagship of the National Laboratory for Fusion (LNF) and part of the Spanish ICTS catalogue. As members of the LNF, the proponents have full access to TJ-II, where the several diagnostics relevant for the study are available. In particular, a steerable Doppler reflectometry (DR) system provides the simultaneous measurement of fluctuations and flows, allowing for very detailed studies of turbulence, critical for the characterization of drift modes. As well, a helical array of Mirnov coils has been recently added to TJ-II, allowing for a detailed study of AEs, including their complex 3D structure in non-axisymmetric devices. W7-X is sited in the Max-Planck-Institut für Plasmaphysik (IPP) in Greifswald. W7X is the largest stellarator in the world and was built to reproduce a number of reactor-relevant features such as optimized magnetic field, high beta operation or actively cooled island divertor. Since 2015, the LNF has collaborated with IPP in the development of a DR system, which has already been successfully operated in previous experimental campaigns. Presently, this system is being refurbished including a number of improvements which will greatly expand the scope of the experimental measurements which can be carried out. As well, a new diagnostic has been included in the proposal: A Charge eXchange Recombination Spectroscopy (CXRS) system, which will complement the investigation of plasma flows carried out by the DR. These diagnostics will ensure access to experimental data in reactor-relevant conditions during the forthcoming OP2.1-OP2.3 campaigns, scheduled for the 2022-2024 period. On top of these purely experimental activities, we outline the data analysis and comparison of physical results to numerical simulations of turbulence (gyrokinetic codes), AE stability (gyrofluid codes), plasma profiles (neoclassical codes) or synthetic DR response to plasma conditions (2D full wave code).
TJ-II is the flagship of the National Laboratory for Fusion (LNF) and part of the Spanish ICTS catalogue. As members of the LNF, the proponents have full access to TJ-II, where the several diagnostics relevant for the study are available. In particular, a steerable Doppler reflectometry (DR) system provides the simultaneous measurement of fluctuations and flows, allowing for very detailed studies of turbulence, critical for the characterization of drift modes. As well, a helical array of Mirnov coils has been recently added to TJ-II, allowing for a detailed study of AEs, including their complex 3D structure in non-axisymmetric devices. W7-X is sited in the Max-Planck-Institut für Plasmaphysik (IPP) in Greifswald. W7X is the largest stellarator in the world and was built to reproduce a number of reactor-relevant features such as optimized magnetic field, high beta operation or actively cooled island divertor. Since 2015, the LNF has collaborated with IPP in the development of a DR system, which has already been successfully operated in previous experimental campaigns. Presently, this system is being refurbished including a number of improvements which will greatly expand the scope of the experimental measurements which can be carried out. As well, a new diagnostic has been included in the proposal: A Charge eXchange Recombination Spectroscopy (CXRS) system, which will complement the investigation of plasma flows carried out by the DR. These diagnostics will ensure access to experimental data in reactor-relevant conditions during the forthcoming OP2.1-OP2.3 campaigns, scheduled for the 2022-2024 period. On top of these purely experimental activities, we outline the data analysis and comparison of physical results to numerical simulations of turbulence (gyrokinetic codes), AE stability (gyrofluid codes), plasma profiles (neoclassical codes) or synthetic DR response to plasma conditions (2D full wave code).
== Dissemination of project results (peer-reviewed publications and conference presentations) ==


== References ==
== References ==
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