Plasma Physics Regimes in Tokamaks with Li Walls

Zakharo, L.E.; Gorelenkov, N.N.; White, R. B.; Krasheninnikov, S. I.; Pereverzev, G.

doi:10.2172/814746

Cited by 5 publications

(6 citation statements)

References 10 publications

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“…Along with these core property changes, resulting in an increase in plasma pressure as a whole, the toroidal current during the flat-top period is found to nearly double (see I p data in Fig. 2), which is consistent with a theoretical prediction [12], even at the same vertical magnetic field (see B v data in Fig. 2).…”

Section: Shown Insupporting

confidence: 85%

Active particle control in the CPD compact spherical tokamak by a lithium-gettered rotating drum limiter

Hirooka

Zushi

Bhattacharyay

et al. 2009

Journal of Nuclear Materials

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Section: Shown Insupporting

confidence: 85%

Active particle control in the CPD compact spherical tokamak by a lithium-gettered rotating drum limiter

Hirooka

Zushi

Bhattacharyay

et al. 2009

Journal of Nuclear Materials

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“…In their model, the magnitude of the vertical magnetic field B z is the key parameter determining the relative importance of the two loss channels. A condition for a poloidal MHD equilibrium was formulated in terms of two one-dimensional partial differential equations [6]. Surprisingly, no systematic experimental study has been undertaken to date of this fundamental plasma phenomenon, related to one of the simplest possible plasma confinement schemes by a magnetic field.…”

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confidence: 99%

Effects of a Vertical Magnetic Field on Particle Confinement in a Magnetized Plasma Torus

et al. 2004

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The particle confinement in a magnetized plasma torus with superimposed vertical magnetic field is modeled and measured experimentally. The formation of an equilibrium characterized by a parallel plasma current canceling out the grad B and curvature drifts is described using a two-fluid model. Characteristic response frequencies and relaxation rates are calculated. The predictions for the particle confinement time as a function of the vertical magnetic field are verified in a systematic experimental study on the TORPEX device, including the existence of an optimal vertical field and the anticorrelation between confinement time and density.

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“…A fully nonrecycling first wall has been theoretically predicted to fundamentally alter the nature of plasmas in tokamaks, including ITER [1]. Similar profound changes may be expected for any magnetically confined plasma configuration [2]. The CDX-U experiments [3], which employed a liquid lithium belt or tray limiter, represented an intermediate step towards a full low recycling wall in LTX.…”

Section: Introductionmentioning

confidence: 85%

Performance Projections For The Lithium Tokamak Experiment (LTX)

Majeski¹,

Berzak²,

Gray³

et al. 2009

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Use of a large-area liquid lithium limiter in the CDX-U tokamak produced the largest relative increase (an enhancement factor of 5-10) in Ohmic tokamak confinement ever observed. The confinement results from CDX-U do not agree with existing scaling laws, and cannot easily be projected to the new lithium tokamak experiment (LTX). Numerical simulations of CDX-U low recycling discharges have now been performed with the ASTRA-ESC code with a special reference transport model suitable for a diffusion-based confinement regime, incorporating boundary conditions for nonrecycling walls, with fuelling via edge gas puffing. This model has been successful at reproducing the experimental values of the energy confinement (4-6 ms), loop voltage (<0.5 V), and density for a typical CDX-U lithium discharge. The same transport model has also been used to project the performance of the LTX, in Ohmic operation, or with modest neutral beam injection (NBI). NBI in LTX, with a low recycling wall of liquid lithium, is predicted to result in core electron and ion temperatures of 1-2 keV, and energy confinement times in excess of 50 ms. Finally, the unique design features of LTX are summarized.

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Plasma Physics Regimes in Tokamaks with Li Walls

Cited by 5 publications

References 10 publications

Active particle control in the CPD compact spherical tokamak by a lithium-gettered rotating drum limiter

Active particle control in the CPD compact spherical tokamak by a lithium-gettered rotating drum limiter

Effects of a Vertical Magnetic Field on Particle Confinement in a Magnetized Plasma Torus

Performance Projections For The Lithium Tokamak Experiment (LTX)

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