An ergodic divertor for tore supra

Samain, A.; Grosman, A.; Błeński, T.; Fuchs, Gerhard; Steffen, Bernhard

doi:10.1016/0022-3115(84)90383-0

Cited by 48 publications

(30 citation statements)

References 7 publications

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“…Taking into account the temperature dependence of the emission coefficient of CV in Fig.11, the decrease in CV observed in the modeling is due to a combined effect of the reduction of C 4+ density and the outward shift to low temperature region. The impurity screening in a stochastic layer with the friction force has also been predicted in previous theoretical analyses [56,57,58,59,60,61]. Although some of them also combine an effect of the parallel electric field, it is not found to be so significant in the present modeling.…”

Section: +supporting

confidence: 50%

Edge impurity transport study in the stochastic layer of LHD and the scrape-off layer of HL-2A

Kobayashi¹,

Morita²,

Dong³

et al. 2013

Nucl. Fusion

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Abstract. Edge impurity transport has been investigated in the stochastic layer of Large Helical Device (LHD) and the scrape-off layer (SOL) of Huan Liuqi-2A (HL-2A) tokamak, as a comparative analysis based on the three-dimensional (3D) edge transport code EMC3-EIRENE and on the carbon emission profile measurement. The 3D simulation predicts impurity screening effect in the both devices, but also predicts different impurity behavior against collisionality and impurity source location between the two devices. The difference is caused by geometrical structures of the magnetic field lines in the stochastic layer and X-point poloidal divertor SOL, i.e., number of poloidal turns of flux tubes affecting poloidal distribution of plasma parameters and impact of perpendicular transport on parallel pressure conservation and energy transport. These processes have an influence on the impurity screening efficiency at upstream and downstream positions of field lines. The carbon emission measured in the stochastic layer of LHD clearly indicates the screening effect in high density region. The result can be qualitatively interpreted by the present modeling, although the modeling shows a slight difference in the quantitative behavior of carbon ions in the stochastic layer of LHD. On the other hand, comparison of the carbon emission profile from HL-2A with the modeling is not straightforward. It is found that the impurity distribution in the HL-2A SOL is very sensitive to the impurity source location. In order to interpret the experimental observation a further study is necessary, in particular, on the impurity source distribution in the divertor plate and the first wall.

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Section: +supporting

confidence: 50%

Edge impurity transport study in the stochastic layer of LHD and the scrape-off layer of HL-2A

Kobayashi¹,

Morita²,

Dong³

et al. 2013

Nucl. Fusion

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“…To study Hamiltonian field line equations a new symplectic mapping method has been developed [28,34,35]. The method is applicable for generic Hamiltonian systems of type (6)- (8). The flux-preserving maps are constructed using the methods of the Hamilton-Jacobi theory and the classical perturbation theory.…”

Section: Mapping Methods To Integrate Field Line Equationsmentioning

confidence: 99%

“…The behaviour of field lines mainly determined by the spectrum of the resonant magnetic perturbations in (8), h mn (ψ). In general, they depend on the vacuum magnetic perturbations (4), (5) and the equilibrium plasma configuration.…”

Section: Spectrum Of Magnetic Perturbations In a Toroidal Systemmentioning

confidence: 99%

Overview of magnetic structure induced by the TEXTOR-DED and the related transport

et al. 2003

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The dynamic ergodic divertor (DED), a new concept of the ergodic divertor, is presently installed for the TEXTOR tokamak. Beside the conventional ergodic divertor operation the DED also permits the operation with a rotating magnetic field which allows, in particular, to broaden the heat deposition pattern on the divertor plates. Since its first proposal of the DED in 1996 the structure of magnetic field, especially, the onset of ergodic zone of field lines and related transport in the DED-operation has been extensively studied using different theoretical and numerical methods. New methods to study the magnetic field, in particular, the field line mapping have been developed. The presentation gives the overview of the studies on the structure of magnetic field in the DED, the formation of the ergodic and laminar zones of field lines at the plasma edge. It also includes studies on the modelling efforts of the transport of heat and particles in the ergodic and laminar zones.

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“…In an axisymmetric tokamak, this separatrix between confined and open magnetic field lines is sharp, with the lines just a short distance outside the separatrix striking a solid surface after a few toroidal circuits. However, in stellarators 1,2 or in nonaxisymmetric tokamks, [3][4][5][6][7][8][9] field lines in an extended region outside the separatrix can require many toroidal circuits before they strike a solid surface. These magnetic field lines form a stochastic layer around the plasma.…”

Section: Introductionmentioning

confidence: 99%

Plasma effects on the location of the outermost magnetic surface

Boozer

2005

Physics of Plasmas

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In both tokamaks and stellarators, the plasma boundary is often defined by the separatrix between magnetic field lines that form toroidal surfaces and field lines that strike solid objects such as the chamber walls or divertor plates. Extremely small magnetic perturbations can move this separatrix radially inward. However, in the presence of a plasma, this radial movement of the separatrix causes a complicated spatial distribution of plasma pressure, which gives rise to currents that can greatly modify or even shield out the magnetic perturbations. An estimate is given of the minimum magnetic perturbation that is required to break up toroidal magnetic surfaces while avoiding plasma shielding.

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An ergodic divertor for tore supra

Cited by 48 publications

References 7 publications

Edge impurity transport study in the stochastic layer of LHD and the scrape-off layer of HL-2A

Edge impurity transport study in the stochastic layer of LHD and the scrape-off layer of HL-2A

Overview of magnetic structure induced by the TEXTOR-DED and the related transport

Plasma effects on the location of the outermost magnetic surface

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