Stochastic magnetic field driven charge transport and zonal flow during magnetic reconnection

Ding, W. X.; Brower, D. L.; Craig, D.; Chapman, B. E.; Ennis, D.A.; Fiksel, G.; Gangadhara, S.; Hartog, D. J. Den; Mirnov, V. V.; Prager, S. C.; Sarff, J. S.; Svidzinski, V. A.; Terry, P. W.; Yates, T.

doi:10.1063/1.2837047

Cited by 8 publications

(7 citation statements)

References 34 publications

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“…8. Before the onset of PPCD, most of the power is concentrated below 30 kHz which is the characteristic frequency range of tearing modes 18 . During the PPCD-induced improved confinement period, the E r fluctuations are reduced over all frequencies except near 50 kHz.…”

Section: Preliminary Resultsmentioning

confidence: 99%

Development of a multi-channel capacitive probe for electric field measurements with fine spatial and high time resolution

Nishizawa

Almagri

Goodman

et al. 2018

Review of Scientific Instruments

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A capacitive probe [Mingsheng, Tan, et al. Rev. Sci. Instrum 88, 023502 (2017)] is one of a few diagnostics that is directly sensitive to the plasma potential. Using this diagnostic technique, a Multi-channel Linear Capacitive Probe (MLCP) is developed for turbulence measurements. The MLCP has 10 spatial channels and provides 9 points of radial electric field measurements simultaneously with a spatial step of 7 mm. A new readout circuit and a correction technique for low frequency attenuation are also developed to achieve the required spatial and time resolution. A performance test of the MLCP using a reversed field pinch plasma confirms that the MLCP resolves sub-centimeter structures of the equilibrium radial electric field profile and fluctuations up to 680 kHz.

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Section: Preliminary Resultsmentioning

confidence: 99%

Development of a multi-channel capacitive probe for electric field measurements with fine spatial and high time resolution

Nishizawa

Almagri

Goodman

et al. 2018

Review of Scientific Instruments

Self Cite

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“…In Ref. 33 results of measurement of the gradient of line average density perturbation near resonant surface at sawtooth crash are reported. Assuming given localized profile of plasma density perturbation near resonant surface, these measurements can relate the amplitude and the width of this profile, such that if the width of density perturbation is several percent of a then its amplitude is several percent of the equilibrium density.…”

Section: Appendix: Secondary Instabilities In Rfpmentioning

confidence: 98%

Particle-in-cell simulations of tearing modes in reversed-field-pinch-like plasma

Svidzinski

Albright

et al. 2009

Physics of Plasmas

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Fully electromagnetic particle-in-cell simulations of tearing modes in two-dimensional plane geometry in a force-free reversed field pinch (RFP)-like plasma equilibrium are performed to study possible kinetic effects on these modes in RFPs. Linear tearing modes are compared in the kinetic and two fluid models. The results showed that the growth rates and the profiles of magnetic field components in the two models are very similar, indicating that the kinetic effects on the studied tearing modes are weak such that the two fluid approximation is rather accurate for modeling these instabilities in RFPs. During the nonlinear evolution of the tearing mode in this geometry, small scale secondary instabilities located near the internal layer of the primary tearing instability are excited. These secondary instabilities appear to be driven by the nonlinearly induced local pressure gradient in the regions of unfavorable curvature of the nonlinearly evolved magnetic field. They could also appear in a realistic RFP geometry and play a role during sawtooth crashes in these machines.

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“…This indicate that the turbulent viscous stress balances b x ∂ x u z . Similarly, Equation (44) gives the compressive energy flux (H)…”

Section: Strong Turbulencementioning

confidence: 99%

Ion heat and parallel momentum transport by stochastic magnetic fields and turbulence

Chen¹,

Diamond²,

Tobias³

2021

Plasma Phys. Control. Fusion

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The theory of turbulent transport of parallel momentum and ion heat by the interaction of stochastic magnetic fields and turbulence is presented. Attention is focused on determining the kinetic stress and the compressive energy flux. A critical parameter is identified as the ratio of the turbulent scattering rate to the rate of parallel acoustic dispersion. For the parameter large, the kinetic stress takes the form of a viscous stress. For the parameter small, the quasilinear residual stress is recovered. In practice, the viscous stress is the relevant form, and the quasilinear limit is not observable. This is the principal prediction of this paper. A simple physical picture is developed and shown to recover the results of the detailed analysis.

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Stochastic magnetic field driven charge transport and zonal flow during magnetic reconnection

Cited by 8 publications

References 34 publications

Development of a multi-channel capacitive probe for electric field measurements with fine spatial and high time resolution

Development of a multi-channel capacitive probe for electric field measurements with fine spatial and high time resolution

Particle-in-cell simulations of tearing modes in reversed-field-pinch-like plasma

Ion heat and parallel momentum transport by stochastic magnetic fields and turbulence

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