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- Helander, Per, 1967, et al.
(author)
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Stellarator bootstrap current and plasma flow velocity at low collisionality
- 2017
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In: Journal of Plasma Physics. - 0022-3778 .- 1469-7807. ; 83:2
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Journal article (peer-reviewed)abstract
- The bootstrap current and flow velocity of a low-collisionality stellarator plasma are calculated. As far as possible, the analysis is carried out in a uniform way across all low-collisionality regimes in general stellarator geometry, assuming only that the confinement is good enough that the plasma is approximately in local thermodynamic equilibrium. It is found that conventional expressions for the ion flow speed and bootstrap current in the low-collisionality limit are accurate only in the 1/nu -collisionality regime and need to be modified in the root-nu-regime. The correction due to finite collisionality is also discussed and is found to scale as nu^2/5
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- Mollén, Albert, 1985, et al.
(author)
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Impurities in a non-axisymmetric plasma: Transport and effect on bootstrap current
- 2015
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In: Physics of Plasmas. - : AIP Publishing. - 1089-7674 .- 1070-664X. ; 22:11, s. 112508-
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Journal article (peer-reviewed)abstract
- Impurities cause radiation losses and plasma dilution, and in stellarator plasmas the neoclassical ambipolar radial electric field is often unfavorable for avoiding strong impurity peaking. In this work we use a new continuum drift-kinetic solver, the SFINCS code (the Stellarator Fokker-Planck Iterative Neoclassical Conservative Solver) [M. Landreman et al., Phys. Plasmas 21 (2014) 042503] which employs the full linearized Fokker-Planck-Landau operator, to calculate neoclassical impurity transport coefficients for a Wendelstein 7-X (W7-X) magnetic configuration. We compare SFINCS calculations with theoretical asymptotes in the high collisionality limit. We observe and explain a 1/nu-scaling of the inter-species radial transport coefficient at low collisionality, arising due to the field term in the inter-species collision operator, and which is not found with simplified collision models even when momentum correction is applied. However, this type of scaling disappears if a radial electric field is present. We also use SFINCS to analyze how the impurity content affects the neoclassical impurity dynamics and the bootstrap current. We show that a change in plasma effective charge Zeff of order unity can affect the bootstrap current enough to cause a deviation in the divertor strike point locations.
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- Newton, Sarah, 1981, et al.
(author)
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Impurity transport and bulk ion flow in a mixed collisionality stellarator plasma
- 2017
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In: Journal of Plasma Physics. - : Cambridge University Press (CUP). - 0022-3778 .- 1469-7807. ; 83:5
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Journal article (peer-reviewed)abstract
- The accumulation of impurities in the core of magnetically confined plasmas, resulting from standard collisional transport mechanisms, is a known threat to their performance as fusion energy sources. Whilst the axisymmetric tokamak systems have been shown to benefit from the effect of temperature screening, that is an outward flux of impurities driven by the temperature gradient, impurity accumulation in stellarators was thought to be inevitable, driven robustly by the inward pointing electric field characteristic of hot fusion plasmas. We have shown in Helander et al. (Phys. Rev. Lett, vol. 118, 2017a, 155002) that such screening can in principle also appear in stellarators, in the experimentally relevant mixed collisionality regime, where a highly collisional impurity species is present in a low collisionality bulk plasma. Details of the analytic calculation are presented here, along with the effect of the impurity on the bulk ion flow, which will ultimately affect the bulk contribution to the bootstrap current.
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- Newton, Sarah, 1981, et al.
(author)
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Impurity transport and plasma flow in a mixed collisionality stellarator plasma
- 2016
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In: Proceedings of 26th IAEA Fusion Energy Conference, Kyoto, Japan. ; , s. THC/PDP-15
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Conference paper (other academic/artistic)abstract
- Neoclassical accumulation of impurities in the core of hot stellarator plasmas is a known problem. The complexity of neoclassical transport in stellarators means that few analytic studies are available to support numerical modelling efforts, and a robust understanding of the parameter dependence of the impurity flux is still lacking.Therefore we present an extension of the existing analytic treatment for highly collisional plasmas, into the experimentally relevant mixed collisionality regime -- where a dominant heavy, collisional, impurity is present in a collisionless bulk plasma, taken here to be in the 1/\nu regime.We find that temperature screening of the impurity flux by the bulk ion temperature gradient will arise.We also determine the bulk ion flow in the flux surface, and thus the effect of the impurity on the bulk ion contribution to the bootstrap current.
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