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Fluid moments in the reduced model for plasmas with large flow velocity

Miyato, Naoaki; Scott, B. D.*

Representation of particle fluid moments in terms of fluid moments in the modified guiding-centre model for flowing plasmas with large $${bf E}times{bf B}$$ velocity is derived from the formal exact representation by a perturbative expansion in the subsonic flow case. It is similar to that in the standard gyrokinetic model in the long wavelength limit, except it has an additional flow term. The flow term has no effect on the representation for particle density, leading to the same representation as the standard one formally. Although the exact representation usually used in the standard gyrokinetic model has a different form from that in the modified guiding-centre case, correspondence between the two models is shown by considering the alternative exact representation in the standard gyrokinetic case. The representation for particle density is also obtained by a variational method which is used to derive the representation in the transonic case.



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