On Kinetic Resistive Wall Mode Theory with Sheared Rotation

Shiraishi, Jun; Miyato, N.; Matsunaga, G.

doi:10.1585/pfr.9.3403027

Cited by 7 publications

(7 citation statements)

References 6 publications

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“…The first extension stems from the generalisation of the guiding centre Lagrangian, which was performed in ref. 15 . As was pointed out in the Introduction, v should be “random” motion from V .…”

Section: Resultsmentioning

confidence: 99%

“… 16 , where L 0 is the standard guiding centre Lagrangian, R is the position of the guiding centre and v || is the parallel component of the particle velocity in the frame moving with V . After some manipulation, we obtain 15 …”

Section: Resultsmentioning

confidence: 99%

“…The derivation of equation (5) is described in ref. 15 , and the detail of the MINERVA/RWMaC code is described in ref. 19 .…”

Section: Methodsmentioning

confidence: 99%

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Flow-Induced New Channels of Energy Exchange in Multi-Scale Plasma Dynamics – Revisiting Perturbative Hybrid Kinetic-MHD Theory

Shiraishi

Miyato

Matsunaga

2016

Sci Rep

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It is found that new channels of energy exchange between macro- and microscopic dynamics exist in plasmas. They are induced by macroscopic plasma flow. This finding is based on the kinetic-magnetohydrodynamic (MHD) theory, which analyses interaction between macroscopic (MHD-scale) motion and microscopic (particle-scale) dynamics. The kinetic-MHD theory is extended to include effects of macroscopic plasma flow self-consistently. The extension is realised by generalising an energy exchange term due to wave-particle resonance, denoted by δ WK. The first extension is generalisation of the particle’s Lagrangian, and the second one stems from modification to the particle distribution function due to flow. These extensions lead to a generalised expression of δ WK, which affects the MHD stability of plasmas.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Flow-Induced New Channels of Energy Exchange in Multi-Scale Plasma Dynamics – Revisiting Perturbative Hybrid Kinetic-MHD Theory

Shiraishi

Miyato

Matsunaga

2016

Sci Rep

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“…The hybrid kinetic MHD model neglects the second term in the lefthand side of equation (6), which is the hot particle inertia. However, under a reasonable assumption 6) can be transformed to the form as…”

Section: Arbitrariness Of Rotation Of Hot Particles In the Hybrid Kin...mentioning

confidence: 99%

“…However, all the above theor etical studies [1,4,5] are based on the hybrid kineticMHD model without plasma rotation. Recently, we have extended the hybrid kineticMHD model to include selfconsistent bulk rotation effects [6,7]. By the term 'selfconsistent', we mean that such rotational effects on the guidingcenter motion as Coriolis and centrifugal accelerations are included, while they are not considered in the previous model.…”

Section: Introductionmentioning

confidence: 99%

Impact of hot particles on resistive wall mode stability in rotating high-beta plasmas

Shiraishi¹,

Miyato²,

Matsunaga³

et al. 2017

Nucl. Fusion

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We investigate kinetic effects of hot particles and rotating bulk plasmas on resistive wall mode (RWM) stability. To this end, we invoke the hybrid kineticmagnetohydrodynamic (MHD) model, extended to include selfconsistent rotation effects. The extended model needs macroscopic 'rotation' due to collective motion of hot and bulk particles. In this paper, we point out that the rotation of hot particles is arbitrary in the hybrid kineticMHD formalism, due to the assumption of small hot particle density. To remove this arbitrariness, by considering an equilibrium distribution function of hot particles interacting with rotating bulk particles, we compute the 'rotation' of hot particles. By applying the extended hybrid kineticMHD model to bulk and hot particles, we have carried out numerical analysis of RWM stability. By varying parameters for neutral beam injection (injection energy and injection pitch angle), we find that new stable regions arise due to additional energy exchange between RWMs and hot particles, induced by the hot particles' rotation.

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Turbulent Transport in Tokamak

Kikuchi

Azumi²

2015

Frontiers in Fusion Research II

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Drift waves in Chap. 5 is most likely candidates of turbulent transport in tokamak and flow shear is key to reduction of turbulent transport. The turbulence itself can produce flow and flow shear through zonal flow and mean flow, which plays essential role for realizing fusion burn in ITER. MHD stability physics of advanced tokamak tells us plasma pressure profile must be controlled to avoid ideal and resistive MHD modes to realize tokamak fusion power. Control of temperature and density profiles requires basic understanding of transport processes across flux surface and to identify key parameters. Turbulent transport is discussed related to its critical temperature gradient transport and the self-organized criticality in Sect. 7.1, flow shear suppression of turbulence in Sect. 7.2, Hasegawa-Mima equation and zonal flow in Sect. 7.3, transport bifurcation to ITB (Internal Transport Barrier) and ETB (Edge Transport Barrier) in Sect. 7.4 and the status of the electromagnetic turbulence in Sect. 7.5 and turbulent momentum transport in Sect. 7.6 in brief.Further Reading: Textbooks: Diamond (2010) [168] shows their original approaches to turbulent transport. Balescu (2005) [41] provides comprehensive framework of anomalous transport theories. Textbooks on the fluid turbulence are quite useful for plasma physics as well such as Landau (1987) [495], Kida (1999) [428] and Frisch (1995) [215]. Stringer (1993) [721] is a nice short introduction to basic concepts. Kadomtsev (1965) [407] includes some of fundamentals still useful for tokamak plasma turbulence. Kadomtsev (1976) [409] is well-written book on collective motions behind plasma turbulence.Review papers: Diamond (2005) [166] is well-written review for zonal flow dynamics. Fujisawa [222] is good review paper on zonal flow experiments. is good introduction to trapped particle instabilities in tokamak. Terry (2000) [764] is useful to understand turbulent decorrelation. Dupree (1972) [181] is a pioneering paper on two point correlation theory which is essential for turbulent decorrelation theory.

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On Kinetic Resistive Wall Mode Theory with Sheared Rotation

Cited by 7 publications

References 6 publications

Flow-Induced New Channels of Energy Exchange in Multi-Scale Plasma Dynamics – Revisiting Perturbative Hybrid Kinetic-MHD Theory

Flow-Induced New Channels of Energy Exchange in Multi-Scale Plasma Dynamics – Revisiting Perturbative Hybrid Kinetic-MHD Theory

Impact of hot particles on resistive wall mode stability in rotating high-beta plasmas

Turbulent Transport in Tokamak

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