Heavy impurity confinement in hybrid operation scenario plasmas with a rotating 1/1 continuous mode

Raghunathan, M.; Graves, J. P.; Nicolas, T; Cooper, W. A.; Garbet, X.; Pfefferlé, David

doi:10.1088/1361-6587/aa896f

Cited by 11 publications

(13 citation statements)

References 38 publications

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“…The advantages of the equilibrium approach to external kink mode problems are numerous. First, the computations are fast and accurate, and second they provide convenient Fourier decomposed magnetic geometry for advanced studies such as fast particle [11] and impurity transport [12] in non-axisymmetric plasmas. Such studies require long and highly accurate particle simulations.…”

Section: Introductionmentioning

confidence: 99%

Free boundary 3D ideal MHD equilibrium calculations for non-linearly saturated current driven external kink modes in tokamaks

et al. 2018

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It is shown that free boundary 3D equilibrium calculations in tokamak geometry are capable of capturing the physics of non-linearly saturated external kink modes for monotonic current and q profiles typical of standard (baseline) plasma scenarios. The VMEC ideal MHD equilibrium model exhibits strong flux surface corrugations of the plasma vacuum boundary, driven by the core current profile. A method is presented which conveniently extracts the amplitude of the corrugation in terms of Fourier components in straight field line coordinates. The Fourier spectrum, and condition for non-linear corrugation agrees well with linear simulations, and the saturated amplitude agrees well with non-linear analytic calculations.

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Section: Introductionmentioning

confidence: 99%

Free boundary 3D ideal MHD equilibrium calculations for non-linearly saturated current driven external kink modes in tokamaks

et al. 2018

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“…Particle trajectories are studied separately in each subensemble S. The average potential (14), determined by the EC, yields an average trajectory in each subensemble. It is obtained by averaging Eqs.…”

Section: Dtm Semi-analytical Methodsmentioning

confidence: 99%

Effects of the parallel acceleration on heavy impurity transport in turbulent tokamak plasmas

Vlad,

Palade,

Spineanu

2020

Preprint

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A process specific to the dynamics of the heavy impurities in turbulent tokamak plasmas is found and analysed. We show that the parallel stochastic acceleration is strongly coupled to the perpendicular transport and generates a radial pinch velocity. The interaction is produced with the hidden drifts, a quasi-coherent component of the motion that consists of a pair of average radial velocities in opposite directions. The parallel acceleration breaks this symmetry and yields a radial average velocity that can be in the inward or outward direction. The transport of the tungsten ions in three-dimensional turbulence is analysed in the frame of a test particle model using numerical simulations. The results show that the acceleration induced pinch can be important for W impurity transport in present days tokamaks and in ITER.

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“…The high radiation emission imposes to develop methods for controlling the concentration of W ions in tokamak core plasmas. A huge experimental [1][2][3][4][5][6][7][8][9], theoretical [10][11][12][13] and numerical [14][15][16][17] effort was directed in the last decades to the understanding of W ion transport and dynamics. In spite of important achievements, this domain is still open as shown by many very recent papers [18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Turbulent transport of the W ions in tokamak plasmas: properties derived from a test particle approach

Palade¹,

Vlad²,

Spineanu³

2021

Nucl. Fusion

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A detailed analysis of a special type of turbulent pinch mechanism for tungsten (W) ions is presented. It is based on the numerical simulation of ion trajectories in a complex test-particle model that contains realistic representations of the turbulence and of the confining magnetic field, plasma rotation, ion collisions, the polarization drift and the parallel stochastic acceleration. The origin of the pinch is a special type of order generated by an average poloidal velocity V p superposed on the E × B stochastic drift. It consists of a pair of radial symmetric drifts, the hidden drifts (HDs), that exactly compensate. The polarization drift and the parallel acceleration drive radial pinch velocities V x by destroying the perfect anti-symmetry of the HDs. These phenomena that were found in simplified models are theoretically validated here in a realistic model of W ion transport. The main conclusion of the paper is that this turbulent mechanism can be experimentally relevant for a large domain of parameters, which cover both existing plasmas and ITER conditions, and it can be responsible for an important amount of the W ion accumulation.

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Heavy impurity confinement in hybrid operation scenario plasmas with a rotating 1/1 continuous mode

Cited by 11 publications

References 38 publications

Free boundary 3D ideal MHD equilibrium calculations for non-linearly saturated current driven external kink modes in tokamaks

Free boundary 3D ideal MHD equilibrium calculations for non-linearly saturated current driven external kink modes in tokamaks

Effects of the parallel acceleration on heavy impurity transport in turbulent tokamak plasmas

Turbulent transport of the W ions in tokamak plasmas: properties derived from a test particle approach

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