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New insights on divertor parallel flows,E ▫$\times$▫ B drifts, and fluctuations from in situ, two-dimensional probe measurement in the Tokamak à Configuration Variable [Elektronski vir]De Oliveira, H. ...In situ, two-dimensional (2D) Langmuir probe measurements across a large part of the TCV outer divertor are reported in L-mode discharges with and without divertor baffles. This provides detailed ... insights into time averaged profiles, particle fluxes, and fluctuation behavior in different divertor regimes. The presence of the baffles is shown to substantially increase the divertor neutral pressure for a given upstream density and to facilitate the access to detachment, an effect that increases with plasma current. The detailed, 2D probe measurements allow for a divertor particle balance, including ion flux contributions from parallel flows and E ▫$\times$▫ B drifts. The poloidal flux contribution from the latter is often comparable or even larger than the former, and the divertor parallel flow direction reverses in some conditions, pointing away from the target. In most conditions, the integrated particle flux at the outer target can be predominantly ascribed to ionization along the outer divertor leg, consistent with a closed-box approximation of the divertor. The exception is a strongly detached divertor, achieved here only with baffles, where the total poloidal ion flux even decreases towards the outer target, indicative of significant plasma recombination. The most striking observation from relative density fluctuation measurements along the outer divertor leg is the transition from poloidally uniform fluctuation levels in attached conditions to fluctuations strongly peaking near the X-point when approaching detachment.Vir: Nuclear fusion [Elektronski vir]. - ISSN 1741-4326 (Vol. 62, no. 9, [article no.] 096028, Sep. 2022, 16 str.)Vrsta gradiva - e-članek ; neleposlovje za odrasleLeto - 2022Jezik - angleškiCOBISS.SI-ID - 195810819
Avtor
De Oliveira, H. |
Theiler, Christian |
Février, Olivier |
Reimerdes, Holger |
Duval, Basil |
Tsui, Cedric Kar-Wai |
Gorno, Sophie |
Sales de Oliveira, Diego |
Perek, Artur |
Costea, Stefan |
Gyergyek, Tomaž |
Kovačič, Jernej, 1982-
Teme
tokamak tcv |
plazmatski izpuh |
divertor |
TCV tokamak |
plasma exhaust |
divertor
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Vnos na polico
Trajna povezava
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De Oliveira, H. | ![]() |
Theiler, Christian | ![]() |
Février, Olivier | ![]() |
Reimerdes, Holger | ![]() |
Duval, Basil | ![]() |
Tsui, Cedric Kar-Wai | ![]() |
Gorno, Sophie | ![]() |
Sales de Oliveira, Diego | ![]() |
Perek, Artur | ![]() |
Costea, Stefan | 53298 |
Gyergyek, Tomaž | 10401 |
Kovačič, Jernej, 1982- | 30680 |
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