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Radio frequency induced and neoclassical asymmetries and their effects on turbulent impurity transport in a tokamak

István Pusztai (Institutionen för teknisk fysik, Nukleär teknik) ; Matt Landreman ; Albert Mollén (Institutionen för teknisk fysik, Nukleär teknik) ; Yevgen O. Kazakov ; Tünde Fülöp (Institutionen för teknisk fysik, Nukleär teknik)
Contributions to Plasma Physics (0863-1042). Vol. 54 (2014), p. 534.
[Artikel, refereegranskad vetenskaplig]

Poloidal asymmetries in the impurity density can be generated by radio frequency heating in the core and by neoclassical effects in the edge of tokamak plasmas. In a pedestal case study, using global neoclassical simulations we find that finite orbit width effects can generate significant poloidal variation in the electrostatic potential, which varies on a small radial scale. Gyrokinetic modeling shows that these poloidal asymmetries can be strong enough to significantly modify turbulent impurity peaking. In the pedestal the ExB drift in the radial electric field can give a larger contribution to the poloidal motion of impurities than that of their parallel streaming. Under such circumstances we find that up-down asymmetries can also affect impurity peaking.

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Denna post skapades 2014-06-24. Senast ändrad 2015-07-28.
CPL Pubid: 199558


Institutioner (Chalmers)

Institutionen för teknisk fysik, Nukleär teknik (2006-2015)


Hållbar utveckling
Plasmafysik med fusion

Chalmers infrastruktur

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