Nonlinear dynamics of turbulence driven magnetic islands. II. Numerical simulations

Agullo, O.; Muraglia, M.; Benkadda, S.; Poyé, A.; Dubuit, N.; Garbet, X.; Sen, Abhijit

doi:10.1063/1.4981230

Cited by 12 publications

(14 citation statements)

References 25 publications

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“…25 Finally, we have proposed an explicit link between the level of the interchange source, the island size, and the pressure flattening inside the island. These analytical predictions were tested in Part II, 32 and we found a fairly good agreement with the numerical results.…”

Section: Discussionsupporting

confidence: 65%

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Nonlinear dynamics of turbulence driven magnetic islands. I. Theoretical aspects

Agullo¹,

Muraglia²,

Benkadda³

et al. 2017

Physics of Plasmas

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The nonlinear properties of a turbulence driven magnetic island (TDMI) are investigated. Starting from a minimal magnetohydrodynamic fluid model that provides for the generation of a TDMI and using scale separation arguments along with numerical simulation findings, we elucidate the links between the nonlinear transport properties of such magnetic islands and the characteristic features of the small scale turbulence. We also explain the phenomenon of partial pressure flattening inside the TDMI. Published by AIP Publishing. [http://dx

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Section: Discussionsupporting

confidence: 65%

“…32 Thus, we will adopt the hypothesis that intermediate scales are almost adiabatic. (iii) From the mode number larger than m th: , it is found that there is a fast transition towards an equipartition between magnetic and pressure energies.…”

Section: Transport Properties Of Tdmis In the Nonlinear Phasementioning

confidence: 99%

Nonlinear dynamics of turbulence driven magnetic islands. I. Theoretical aspects

Agullo¹,

Muraglia²,

Benkadda³

et al. 2017

Physics of Plasmas

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“…Note that the separatrix of the magnetic island in the 2D T e profile can be roughly estimated by the temporal behavior of the electron temperature. A full 2D measured electron temperature profile and a proper modeling with a synthetic diagnostics are needed to estimate the magnetic island full width accurately [40,41], especially when the localized (not uniform) and dynamic turbulence exists around the magnetic island which can affect the perpendicular electron heat transport characteristics [42].…”

Section: The T E Profile With the Magnetic Islandmentioning

confidence: 99%

Multiscale interaction between a large scale magnetic island and small scale turbulence

et al. 2017

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Multiscale interaction between the magnetic island and turbulence has been demonstrated through simultaneous two-dimensional measurements of turbulence and temperature and flow profiles. The magnetic island and turbulence mutually interact via the coupling between the electron temperature (T e ) gradient, the T e turbulence, and the poloidal flow. The T e gradient altered by the magnetic island is peaked outside and flattened inside the island. The T e turbulence can appear in the increased T e gradient regions. The combined effects of the T e gradient and the the poloidal flow shear determine two-dimensional distribution of the T e turbulence. When the reversed poloidal flow forms, it can maintain the steepest T e gradient and the magnetic island acts more like a electron heat transport barrier. Interestingly, when the T e gradient, the T e turbulence, and the flow shear increase beyond critical levels, the magnetic island turns into a fast electron heat transport channel, which directly leads to the minor disruption. PACS numbers:

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“…The former two instabilities were already described in the former 3-field code version 44 . The equations therein correspond to our equations (18), (19) and (22) with the remaining three fields n, p i and u assumed constant and without neoclassical terms. The ITG mode is new to our model, therefore we need to verify its presence.…”

Section: B Linear Analysis: Evidence Of Itg Modementioning

confidence: 99%

“…The interaction between turbulence and MHD phenomena in fusion device plasmas has received growing attention in the last decade, both in experimental 1-10 and theoretical context [11][12][13][14][15][16][17][18][19][20][21][22][23] . Basically, core MHD activity is dominated by sawteeth and neoclassical tearing modes (NTMs).…”

Section: Introductionmentioning

confidence: 99%

A reduced MHD model for ITG-NTM interplay

et al. 2020

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A 6-field reduced-MHD model is derived for plasma dynamics. The new model describes coherently both Ion Temperature Gradient mode and Tearing mode, and includes neoclassical effects. The model allows the construction of an energy-like quantity with a linear pressure contribution that is conserved except for dissipative, finite Larmor radius and neoclassical terms. This model may be used to study the nonlinear interaction between ITG microturbulence and neoclassical tearing mode, which is responsible for large-scale magnetic islands in tokamaks, and opens the way to a coherent description of turbulent impurity transport in magnetic islands.

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Nonlinear dynamics of turbulence driven magnetic islands. II. Numerical simulations

Cited by 12 publications

References 25 publications

Nonlinear dynamics of turbulence driven magnetic islands. I. Theoretical aspects

Nonlinear dynamics of turbulence driven magnetic islands. I. Theoretical aspects

Multiscale interaction between a large scale magnetic island and small scale turbulence

A reduced MHD model for ITG-NTM interplay

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