Back to Search Start Over

Momentum correction techniques for neoclassical transport in stellarators

Authors :
Yuriy Turkin
C. D. Beidler
H. Maaßberg
Source :
Physics of Plasmas, v.16 (2009), Physics of Plasmas
Publication Year :
2009
Publisher :
AIP Publishing, 2009.

Abstract

In the traditional neoclassical ordering for stellarators, monoenergetic transport coefficients are evaluated using the simplified Lorentz form of the pitch-angle collision operator which violates momentum conservation. In this paper, the parallel momentum balance with radial parallel momentum transport and viscosity terms is analyzed, in particular, with respect to the radial electric field. Next, the impact of momentum conservation in the stellarator long-mean-free-path regime is estimated for the radial transport and the parallel electric conductivity. Two different momentum correction techniques are described based on monoenergetic transport coefficients calculated by the DKES code [W. I. van Rij and S. P. Hirshman, Phys. Fluids B 1, 563 (1989)]. The benchmarking of the parallel electric conductivity and of the bootstrap current is presented for a tokamak as well as for two W7-X stellarator configurations [G. Grieger et al., Phys. Fluids B 4, 2081 (1992)]. Finally, the impact of the momentum correction on the expected total bootstrap current is briefly analyzed for two W7-X scenarios.

Details

ISSN :
10897674 and 1070664X
Volume :
16
Database :
OpenAIRE
Journal :
Physics of Plasmas
Accession number :
edsair.doi.dedup.....de274e9afc1ff85b78661e77cf601186
Full Text :
https://doi.org/10.1063/1.3175328