Global consistency for thin flux tube treatments of toroidal geometry
In order to avoid a self-mapping problem due to a very long correlation length along a field line, present treatments of magnetized plasma turbulence in flux tube geometry often extend the computational domain to several times the field line connection length. This paper shows that this can result in the admission of nonphysical parallel wavelengths, possibly corrupting the solution even if it is converged. Also shown is that if a flux tube domain is constructed by thinning the full spectrum of allowed wavelengths, the same boundary condition results as if the domain were the entire flux surface. The only consistent remedy is therefore to extend the domain in the perpendicular coordinate within the flux surface, possibly all the way back to the entire flux surface, remaining consistent with the global boundary conditions.
Bibliographic Reference: Article: Physics of Plasmas, Vol. 5 (1998) No. 6, pp. 2334-2339
Record Number: 199810993 / Last updated on: 1998-09-15
Original language: en
Available languages: en