Impurity transport model for the normal confinement and high density H-mode 
discharges in Wendelstein 7-AS

Ida, K.; Burhenn, R.; McCormick, K.; Pasch, E.; Yamada, H.; Yoshinuma, M.; Inagaki, S.; Murakami, S.; Osakabe, M.; Liang, Y.; Brakel, R.; Ehmler, H.; Giannone, L.; Grigull, P.; Knauer, J. P.; Maassberg, H.; Weller, A.

doi:10.1088/0741-3335/45/10/006

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Impurity transport model for the normal confinement and high density H-mode discharges in Wendelstein 7-AS

MPG-Autoren

/persons/resource/persons108825

Burhenn, R.
VINETA, Max Planck Institute for Plasma Physics, Max Planck Society;
W7-AS, Max Planck Institute for Plasma Physics, Max Planck Society;

/persons/resource/persons109914

McCormick, K.
Stellarator Scenario Development (E5), Max Planck Institute for Plasma Physics, Max Planck Society;
W7-AS, Max Planck Institute for Plasma Physics, Max Planck Society;

/persons/resource/persons110111

Pasch, E.
Stellarator Optimisation (E3), Max Planck Institute for Plasma Physics, Max Planck Society;

/persons/resource/persons108767

Brakel, R.
Experimental Plasma Physics 3 (E3), Max Planck Institute for Plasma Physics, Max Planck Society;

/persons/resource/persons109011

Ehmler, H.
Stellarator Scenario Development (E5), Max Planck Institute for Plasma Physics, Max Planck Society;
VINETA, Max Planck Institute for Plasma Physics, Max Planck Society;

/persons/resource/persons109170

Giannone, L.
Experimental Plasma Physics 1 (E1), Max Planck Institute for Plasma Physics, Max Planck Society;

/persons/resource/persons109226

Grigull, P.
W7-X: Physics (PH), Max Planck Institute for Plasma Physics, Max Planck Society;

/persons/resource/persons109858

Maassberg, H.
Experimental Plasma Physics 3 (E3), Max Planck Institute for Plasma Physics, Max Planck Society;

/persons/resource/persons110770

Weller, A.
Stellarator Scenario Development (E5), Max Planck Institute for Plasma Physics, Max Planck Society;

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Zitation

Ida, K., Burhenn, R., McCormick, K., Pasch, E., Yamada, H., Yoshinuma, M., et al. (2003). Impurity transport model for the normal confinement and high density H-mode discharges in Wendelstein 7-AS. Plasma Physics and Controlled Fusion, 45, 1931-1938. doi:10.1088/0741-3335/45/10/006.

Zitierlink: https://hdl.handle.net/11858/00-001M-0000-0027-3D07-A

Zusammenfassung

An impurity transport model based on diffusivity and the radial convective velocity is proposed as a first approach to explain the differences in the time evolution of Al XII (0.776 nm), Al XI (55 nm) and Al X (33.3 nm) lines following Al-injection by laser blow-off between normal confinement discharges and high density H-mode (HDH) discharges. Both discharge types are in the collisional regime for impurities (central electron temperature is 0.4 keV and central density exceeds 10²⁰m^-3). In this model, the radial convective velocity is assumed to be determined by the radial electric field, as derived from the pressure gradient. The diffusivity coefficient is chosen to be constant in the plasma core but is significantly larger in the edge region, where it counteracts the high local values of the inward convective velocity. Under these conditions, the faster decay of aluminium in HDH discharges can be explained by the smaller negative electric field in the bulk plasma, and correspondingly smaller inward convective velocity, due to flattening of the density profiles.