MHD stability of a plasma in an axisymmetric open divertor configuration

Arsenin, V. V.; Kuyanov, A. Yu.

doi:10.1134/1.1390535

Cited by 16 publications

(11 citation statements)

References 6 publications

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“…I the stability can only be achieved for the case of gradually decreasing pressure radial profile in a divertor cell, 22,35 which is essentially different from the average minimum-B mirror stabilization. In the simulation of Sec.…”

Section: Summary and Discussionmentioning

confidence: 99%

“…19 Historically the equilibrium calculation has been carried out in various divertor mirror cells for isotropic pressure plasma, 20 for anisotropic pressure plasma 19,21 and for kinetic KruskalOberman stability theory with anisotropic pressure. 22 The theoretical study of flute mode stability by a magnetic divertor was done first by Lane et al 23 The subsequently the theory was extended by Pastukhov and Sokolov 24 by taking into account the nonparaxial magnetic filed line curvature and then was extended further more by Sasagawa et al 25 by including the anisotropic ion temperature effects. The general concept of divertor stabilization in mirror-based plasma confinement systems were also discussed by Pastukhov.…”

Section: Introductionmentioning

confidence: 99%

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Flute mode fluctuations in the divertor mirror cell

et al. 2010

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The computer code by reduced magnetohydrodynamic equations were made which can simulate the flute interchange modes ͑similar to the Rayleigh-Taylor instability͒ and the instability associated with the presence of nonuniform plasma flows ͑similar to the Kelvin-Helmholtz instability͒. This code is applied to a model divertor and the GAMMA10 ͓M. Inutake et al., Phys. Rev. Lett. 55, 939 ͑1985͔͒ with divertor in order to investigate the flute modes in these divertor cells. The linear growth rate of the flute instability determined by the nonlocal linear analysis agrees with that in the linear phase of the simulations. There is a stable nonlinear steady state in both divertor cells, but the nonlinear steady state is different between the model divertor and the GAMMA10 with divertor.

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Section: Summary and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Flute mode fluctuations in the divertor mirror cell

et al. 2010

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“…The Kruskal-Oberman kinetic model [16] allows profiles with larger value of |p /p| than what follows from (4). This was demonstrated in [17] for the configuration with divertor.…”

Section: Plasma Mhd Stability Questionsmentioning

confidence: 71%

On the way to project EPSILON

Kulygin¹,

Arsenin²,

Zhil'tsov³

et al. 2007

Nucl. Fusion

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The pseudosymmetry principle being used for hot plasma confinement magnetic systems design could provide the realization of all the ability of magnetic confinement for reactor construction. In particular, it enables hot plasma confinement at steady state operational mode with a ‘tokamak’ level of confinement time and a high average β value (plasma pressure to ‘vacuum’ magnetic field pressure ratio). High β operation provides the possibility of thinking of advanced fuels (D–3He, D–D) use.It is proposed to check the main idea and the results of a preliminary theoretical study experimentally in the frame of the EPSILON project—closed mirror magnetic trap with extremely small rotational transform and with poloidal pseudosymmetry. The EPSILON system consists of two (or more) multimirror traps, closed with curvilinear equilibrium elements. Mirror field, MHD stability and plasma cleaning are provided by axially symmetric divertors with zero magnetic field at the separatrix displaced along the multimirror traps.

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“…The design of a magnetic divertor is a recent issue in the attempt to improve the radial confinement of the GAMMA10 tandem mirror 14 with the developments of the theoretical study. 15,16 Experiments on the magnetic divertor were carried out at the TARA tandem mirror 17 in which complete divertor stabilization of the central cell plasma was not achieved in these experiments because the plasma pressure was localized near the axis, but some indirect evidence of stabilizing influence was observed. In contrast, the HIEI tandem mirror 18 has been able to stabilize the interchange modes with wider plasma density radial profiles.…”

Section: Introductionmentioning

confidence: 99%

Magnetic-divertor stabilization of an axisymmetric plasma with anisotropic temperature

et al. 2006

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Magnetohydrodynamic stabilization of an axisymmetric mirror plasma with a magnetic divertor is studied. An equation is found for the flute modes, which includes the stabilizing influence of ion temperature anisotropy and nonparaxial magnetic fields, as well as a finite ion Larmor radius. It is shown that if the density profile is sufficiently gentle, then the nonparaxial configuration can stabilize all modes as long as ion temperature is radially uniform. This can be demonstrated even when the density vanishes on the separatrix and even for small ion Larmor radii. It is found, however, that the ion temperature gradient makes the unstable region wider; high ion temperature is required to stabilize the flute mode.

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MHD stability of a plasma in an axisymmetric open divertor configuration

Cited by 16 publications

References 6 publications

Flute mode fluctuations in the divertor mirror cell

Flute mode fluctuations in the divertor mirror cell

On the way to project EPSILON

Magnetic-divertor stabilization of an axisymmetric plasma with anisotropic temperature

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