The reversed field pinch

Marrelli, L.; Martin, P.; Puiatti, M. E.; Sarff, J. S.; Chapman, B. E.; Drake, James R.; Escande, Dominique; Masamune, S.

doi:10.1088/1741-4326/abc06c

Cited by 56 publications

(30 citation statements)

References 619 publications

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“…In particular, motivated by the success of the inductive current profile control [31], the first work on the equilibrium reconstruction based on the GS equation was done in [15], which is the only major publication about axisymmetric RFP equilibrium reconstruction to date. Further progress in the RFP research can be found in a recent review of the RFP [34].…”

Section: Related Workmentioning

confidence: 99%

A Data-Assimilation Based Method for Equilibrium Reconstruction of Magnetic Fusion Plasma and its Application to Reversed Field Pinch

et al. 2021

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Carbon-free energy sources are essential to avoid global warming, and nuclear fusion is expected to play a major role in achieving clean and sustainable energy. In the development of magnetic fusion, there exist a lot of issues related with plasma equilibrium to be studied extensively, typical representative of which is a problem of equilibrium reconstruction of plasma. In this paper we propose a new method of equilibrium reconstruction for fusion plasma based on the data assimilation. Aiming at dealing not only with axisymmetric toroidal plasmas but also with more general toroidal plasmas, we formulate the problems of equilibrium reconstruction in generalized forms and derive methods to solve them. We also propose a method for applying the equilibrium reconstruction method to the reversed field pinch (RFP), and it is applied to a real RFP experimental apparatus for its evaluation. It is shown through numerical experiments that the proposed equilibrium reconstruction method works well with reasonable accuracy. And it is also shown through real experiments applying the RFP apparatus that the equilibrium of RFP plasma is appropriately reconstructed.

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Section: Related Workmentioning

confidence: 99%

A Data-Assimilation Based Method for Equilibrium Reconstruction of Magnetic Fusion Plasma and its Application to Reversed Field Pinch

et al. 2021

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“…As these equations show, the direct supply of electromagnetic energy or any force such as the Hall effect or radiation that yields a current density can produce a magnetic field. For example, the origin of a B field in the plasma lab, including a reversed field pinch (RFP; Marrelli et al 2021), is electromagnetic rather than kinetic. Additionally, the effect of the electric force, gravitational force, or inhomogeneously distributed B field can yield various drift motions of the charged particles.…”

Section: Introductionmentioning

confidence: 99%

Turbulent Magnetic Diffusivity β Effect in a Magnetically Forced System

Park

Cheoun

Kim

2023

ApJ

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We have studied the large-scale dynamo forced with helical magnetic energy. Compared to the kinetic forcing process, the magnetic process is not clearly observed nor intuitive. However, it may represent the actual B field amplification in the stellar corona, accretion disk, plasma lab, or other magnetically dominated systems where the strong kinetic effect does not exist. The interaction between the magnetic field and the plasma is essentially nonlinear. However, when the plasma system is driven by helical energy, whether kinetic or magnetic, the nonlinear process can be linearized with pseudotensors a, β and the large-scale magnetic field B ¯ . Conventionally, the α effect is thought to be the main dynamo effect converting kinetic energy into magnetic energy and transferring it to the large-scale regime. In contrast, β effect has been thought to diffuse magnetic energy. However, these conclusions are not based on the exact definition of α and β. In this paper, instead of the analytic definition of α and β, we derive a semi-analytic equation and apply it to the simulation data. The half analytic and numerical result shows that the averaged α effect is not so important in amplifying the B ¯ field. Rather, it is the negative β effect combined with the Laplacian (∇2 → −k 2) that plays a key role in the dynamo process. Further, the negative magnetic diffusivity accounts for the attenuation of the plasma kinetic energy E ¯ V in large scales. We discuss this process using the theoretical method and the intuitive field structure model.

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“…Magnetic self-organization processes determine the signature equilibrium configuration of reversed-field pinch (RFP) plasmas (Marrelli et al. 2021) driven by steady induction. In these RFP plasmas, the toroidal magnetic field is peaked in the core, decreases monotonically with minor radius and reverses direction near the plasma edge.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic energy transport by tearing fluctuations in a self-organized reversed-field pinch plasma

Thuecks

McCollam

2022

J. Plasma Phys.

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Fluctuation measurements reveal the outward electromagnetic energy flux needed to drive the dynamo electromotive force supporting magnetic self-organization in a reversed-field pinch plasma. The radial Poynting flux due to tearing mode fluctuations is measured with an insertable probe during magnetic relaxation. This flux corresponds to transient power levels much larger than the input power and comparable to the global equilibrium magnetic energy transient loss rate. The probe measurements of this flux are roughly as predicted by a simple Poynting's theorem model upon substitution of equilibrium measurement data.

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The reversed field pinch

Cited by 56 publications

References 619 publications

A Data-Assimilation Based Method for Equilibrium Reconstruction of Magnetic Fusion Plasma and its Application to Reversed Field Pinch

A Data-Assimilation Based Method for Equilibrium Reconstruction of Magnetic Fusion Plasma and its Application to Reversed Field Pinch

Turbulent Magnetic Diffusivity β Effect in a Magnetically Forced System

Electromagnetic energy transport by tearing fluctuations in a self-organized reversed-field pinch plasma

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