Characterisation of the fast-ion edge resonant transport layer induced by 3D perturbative fields in the ASDEX Upgrade tokamak through full orbit simulations

L. Sanchis; M. Garcia-Munoz; A. Snicker; D. A. Ryan; D. Zarzoso; L. Chen; J. Galdon-Quiroga; M. Nocente; J. F. Rivero-Rodriguez; M. Rodriguez-Ramos; W. Suttrop; M. A. Van Zeeland; E. Viezzer; M. Willensdorfer; F. Zonca

doi:10.1088/1361-6587/aaef61

Characterisation of the fast-ion edge resonant transport layer induced by 3D perturbative fields in the ASDEX Upgrade tokamak through full orbit simulations

L. Sanchis, M. Garcia-Munoz, A. Snicker, D. A. Ryan, D. Zarzoso, L. Chen, J. Galdon-Quiroga, M. Nocente, J. F. Rivero-Rodriguez, M. Rodriguez-Ramos, W. Suttrop, M. A. Van Zeeland, E. Viezzer, M. Willensdorfer, F. Zonca

Not published at VTT

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Abstract

In recent experiments at the ASDEX Upgrade tokamak the existence of an Edge Resonant Transport Layer (ERTL) was revealed as the main transport mechanism responsible for the measured fast-ion losses in the presence of externally applied 3D fields. The Monte Carlo orbit-following code ASCOT was used to study the fast-ion transport including the plasma response calculated with MARS-F, reproducing a strong correlation of fast-ion losses with the poloidal mode spectra of the 3D fields. In this work, a description of the physics underlying the ERTL is presented by means of numerical simulations together with an analytical model and experimental measurements to validate the results. The degradation of fast-ion confinement is calculated in terms of the variation of the toroidal canonical momentum (δP _φ). This analysis reveals resonant patterns at the plasma edge activated by 3D perturbations and emphasizes the relevance of nonlinear resonances. The impact of collisions and the radial electric field on the ERTL is analysed.

Original language	English
Article number	014038
Journal	Plasma Physics and Controlled Fusion
Volume	61
Issue number	1
DOIs	https://doi.org/10.1088/1361-6587/aaef61
Publication status	Published - Jan 2019
MoE publication type	A1 Journal article-refereed

Funding

This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training program 2014–2018 under grant agreement number 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission. The simulations were partly performed on the MARCONI supercomputer (CINECA) under project reference FUA32_ASCOT-US. DZ acknowledges support from the A*MIDEX project (no. ANR-11-IDEX-0001-02) funded by the Investissements d’Avenir French Government program, managed by the French National Research Agency (ANR).

Keywords

ASCOT
AUG
canonical angular momentum
fast-ion transport
magnetic perturbations
nonlinear resonances
tokamak

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1088/1361-6587/aaef61

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Sanchis, L., Garcia-Munoz, M., Snicker, A., Ryan, D. A., Zarzoso, D., Chen, L., Galdon-Quiroga, J., Nocente, M., Rivero-Rodriguez, J. F., Rodriguez-Ramos, M., Suttrop, W., Van Zeeland, M. A., Viezzer, E., Willensdorfer, M., & Zonca, F. (2019). Characterisation of the fast-ion edge resonant transport layer induced by 3D perturbative fields in the ASDEX Upgrade tokamak through full orbit simulations. Plasma Physics and Controlled Fusion, 61(1), Article 014038. https://doi.org/10.1088/1361-6587/aaef61

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abstract = "In recent experiments at the ASDEX Upgrade tokamak the existence of an Edge Resonant Transport Layer (ERTL) was revealed as the main transport mechanism responsible for the measured fast-ion losses in the presence of externally applied 3D fields. The Monte Carlo orbit-following code ASCOT was used to study the fast-ion transport including the plasma response calculated with MARS-F, reproducing a strong correlation of fast-ion losses with the poloidal mode spectra of the 3D fields. In this work, a description of the physics underlying the ERTL is presented by means of numerical simulations together with an analytical model and experimental measurements to validate the results. The degradation of fast-ion confinement is calculated in terms of the variation of the toroidal canonical momentum (δP φ). This analysis reveals resonant patterns at the plasma edge activated by 3D perturbations and emphasizes the relevance of nonlinear resonances. The impact of collisions and the radial electric field on the ERTL is analysed.",

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author = "L. Sanchis and M. Garcia-Munoz and A. Snicker and Ryan, \{D. A.\} and D. Zarzoso and L. Chen and J. Galdon-Quiroga and M. Nocente and Rivero-Rodriguez, \{J. F.\} and M. Rodriguez-Ramos and W. Suttrop and \{Van Zeeland\}, \{M. A.\} and E. Viezzer and M. Willensdorfer and F. Zonca",

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doi = "10.1088/1361-6587/aaef61",

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Sanchis, L, Garcia-Munoz, M, Snicker, A, Ryan, DA, Zarzoso, D, Chen, L, Galdon-Quiroga, J, Nocente, M, Rivero-Rodriguez, JF, Rodriguez-Ramos, M, Suttrop, W, Van Zeeland, MA, Viezzer, E, Willensdorfer, M & Zonca, F 2019, 'Characterisation of the fast-ion edge resonant transport layer induced by 3D perturbative fields in the ASDEX Upgrade tokamak through full orbit simulations', Plasma Physics and Controlled Fusion, vol. 61, no. 1, 014038. https://doi.org/10.1088/1361-6587/aaef61

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AU - Sanchis, L.

AU - Garcia-Munoz, M.

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AU - Ryan, D. A.

AU - Zarzoso, D.

AU - Chen, L.

AU - Galdon-Quiroga, J.

AU - Nocente, M.

AU - Rivero-Rodriguez, J. F.

AU - Rodriguez-Ramos, M.

AU - Suttrop, W.

AU - Van Zeeland, M. A.

AU - Viezzer, E.

AU - Willensdorfer, M.

AU - Zonca, F.

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Characterisation of the fast-ion edge resonant transport layer induced by 3D perturbative fields in the ASDEX Upgrade tokamak through full orbit simulations

Abstract

Funding

Keywords

UN SDGs

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