Artículo
Connecting the global H-mode power threshold to the local radial electric field at ASDEX Upgrade
Autor/es | Cavedon, M.
Birkenmeier, G. Pütterich, T. Ryter, F. Viezzer, Eleonora Wolfrum, E. Willensdorfer, M. |
Departamento | Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear |
Fecha de publicación | 2020 |
Fecha de depósito | 2022-04-05 |
Publicado en |
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Resumen | The relation between the macroscopic input power required at ASDEX Upgrade to access the H-mode Pthr and the microscopic E x B shear has been investigated via fast charge-exchange recombination spectroscopy (CXRS) measurements ... The relation between the macroscopic input power required at ASDEX Upgrade to access the H-mode Pthr and the microscopic E x B shear has been investigated via fast charge-exchange recombination spectroscopy (CXRS) measurements at various toroidal magnetic fields, different electron densities, and in both hydrogen and deuterium plasmas. For the H-mode onset, a threshold in the v E x B minimum, an approximation of the E x B shear, has been found. This identifies v E x B and not Er as the important player for the L-H transition. A database of measurements including CXRS, Doppler reflectometry measurements and comparison to neoclassical approximations shows a threshold v E x B of (6.7 ± 1.0) km/s ranging over a factor of three in Pthr. Using these findings, a simple derivation of the Pthr scaling is proposed giving a physics interpretation of the Bt, density and surface dependence of Pthr. |
Agencias financiadoras | EUROfusion Consortium |
Identificador del proyecto | 633053 |
Cita | Cavedon, M., Birkenmeier, G., Pütterich, T., Ryter, F., Viezzer, E., Wolfrum, E. y Willensdorfer, M. (2020). Connecting the global H-mode power threshold to the local radial electric field at ASDEX Upgrade. Connecting the global H-mode power threshold to the local radial electric field at ASDEX Upgrade, 60 (6), 066026. |
Ficheros | Tamaño | Formato | Ver | Descripción |
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10.1088_1741-4326_ab8777.pdf | 931.4Kb | [PDF] | Ver/ | Postprint |