Artículo
Poloidal structure of the edge parallel flow in H-mode, L-mode and I-mode confinement regimes
Autor/es | Cruz Zabala, Diego José
Viezzer, Eleonora Cano Megías, Pilar Cavedon, Marco Dux, Ralph Plank, Ulrike Pütterich, Thomas McKay, Kiera Anne Rodríguez González, Alfonso García Muñoz, Manuel |
Departamento | Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear |
Fecha de publicación | 2024-06-12 |
Fecha de depósito | 2024-07-18 |
Publicado en |
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Resumen | Impurity profiles have been measured with the edge high field side (HFS) and low field side (LFS) charge exchange recombination spectroscopy suite at ASDEX Upgrade enabling the study of the poloidal structure of the edge ... Impurity profiles have been measured with the edge high field side (HFS) and low field side (LFS) charge exchange recombination spectroscopy suite at ASDEX Upgrade enabling the study of the poloidal structure of the edge parallel flow in H-mode, L-mode and I-mode. In H-mode, asymmetries in the impurity density, toroidal and poloidal rotations are found. In I-mode, only toroidal rotation asymmetries have been measured while in L-mode no asymmetries have been observed. The measured parallel flow can be divided in two components, the Pfirsch-Schlüter (PS) flow and the symmetric flow. Two different methods have been followed to determine both contributions to the parallel flow. The first method is based on the calculation of the PS flow at the HFS and LFS from the radial electric field. The second method directly provides the symmetric flow from the flux surface average (FSA) of the parallel flow. In H-mode, the methods provide different results, while in L-mode and I-mode they agree. The differences observed in H-mode between the two methods could be explained by the existence of asymmetries in the impurity density, by the non-negligible particle sources and radial losses, or by the approximations made in the calculation of the FSA of the parallel flow from measurements in two poloidal positions (midplane HFS and LFS) only. |
Agencias financiadoras | Ministerio de Ciencia e Innovación (MICIN). España European Research Council (ERC) |
Identificador del proyecto | PID2020-116822RB-I00
805162 |
Cita | Cruz Zabala, D.J., Viezzer, E., Cano Megías, P., Cavedon, M., Dux, R., Plank, U.,...,García Muñoz, M. (2024). Poloidal structure of the edge parallel flow in H-mode, L-mode and I-mode confinement regimes. Nuclear Fusion, 64 (7), 076051. https://doi.org/10.1088/1741-4326/ad518f. |
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Poloidal structure.pdf | 1.088Mb | [PDF] | Ver/ | Versión publicada |