Effect of superbanana diffusion on fusion reactivity in stellarators

Hinton, F. L.

doi:10.1063/1.4748138

Cited by 2 publications

(3 citation statements)

References 9 publications

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“…The 1/ν regime is the most studied collisionality regime in the transport theory for nonaxisymmetric tori and in particular in stellarators in part because transport coefficients scale unfavourably as T 7/2 for high-temperature plasmas [3,246,271,272,[273][274][275]. If the scaling persists it could make stellarators a much less viable candidate as thermonuclear fusion reactors [276].…”

Section: Bounce Averaged Drift Kinetic Equation and 1/ν Regimementioning

confidence: 99%

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Neoclassical plasma viscosity and transport processes in non-axisymmetric tori

2015

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Neoclassical transport processes are important to the understanding of plasma confinement physics in doubly periodic magnetized toroidal plasmas, especially, after the impact of the momentum confinement on the particle and energy confinement is recognized. Real doubly periodic tori in general are non-axisymmetric, with symmetric tori as a special case. An eight-moment approach to transport theory with plasma density N, plasma pressure p, mass flow velocity V and heat flow q as independent variables is adopted. Transport processes are dictated by the solutions of the momentum and heat flux balance equations. For toroidal plasma confinement devices, the first order (in the gyro-radius ordering) plasma flows are on the magnetic surface to guarantee good plasma confinement and are thus two-dimensional. Two linearly independent components of the momentum equation are required to determine the flows completely. Once this two-dimensional flow is relaxed, i.e. the momentum equation reaches a steady state, plasmas become ambipolar, and all the transport fluxes are determined through the flux-force relation. The flux-force relation is derived both from the kinetic definitions for the transport fluxes and from the manipulation of the momentum and heat flux balance equations to illustrate the nature of the transport fluxes by examining their corresponding driven forces and their roles in the momentum and heat flux balance equations. Steady-state plasma flows are determined by the components of the stress and heat stress tensors in the momentum and heat flux balance equations. This approach emphasizes the pivotal role of the momentum equation in the transport processes and is particularly useful in modelling plasma flows in experiments. The methodology for neoclassical transport theory is applied to fluctuation-driven transport fluxes in the quasilinear theory to unify these two theories. Experimental observations in tokamaks and stellarators for the physics discussed are presented.

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Section: Bounce Averaged Drift Kinetic Equation and 1/ν Regimementioning

confidence: 99%

“…Both the particle and normalized heat fluxes scale as T 7/2 . This unfavourable temperature scaling can have significant impact on the confinement for fusion-born alpha particles [276].…”

Section: Bounce Averaged Drift Kinetic Equation and 1/ν Regimementioning

confidence: 99%

Neoclassical plasma viscosity and transport processes in non-axisymmetric tori

2015

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“…Its potentially important role in current ICF experiments was recently discussed by Molvig et al [5]. A similar effect also applies to magnetic confinement fusion if the magnetic configuration happens to have poor particle confinement for supra-thermal ions [6].…”

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confidence: 72%

Fusion yield rate recovery by escaping hot-spot fast ions in the neighboring fuel layer

Tang¹,

McDevitt²,

Guo³

et al. 2014

EPL

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Free-streaming loss by fast ions can deplete the tail population in the hot spot of an inertial confinement fusion (ICF) target. Escaping fast ions in the neighboring fuel layer of a cryogenic target can produce a surplus of fast ions locally. In contrast to the Knudsen layer effect that reduces hot-spot fusion reactivity due to tail ion depletion, the inverse Knudsen layer effect increases fusion reactivity in the neighboring fuel layer. In the case of a burning ICF target in the presence of significant hydrodynamic mix which aggravates the Knudsen layer effect, the yield recovery largely compensates for the yield reduction. For mix-dominated sub-ignition targets, the yield reduction is the dominant process.

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Effect of superbanana diffusion on fusion reactivity in stellarators

Cited by 2 publications

References 9 publications

Neoclassical plasma viscosity and transport processes in non-axisymmetric tori

Neoclassical plasma viscosity and transport processes in non-axisymmetric tori

Fusion yield rate recovery by escaping hot-spot fast ions in the neighboring fuel layer

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