2007
DOI: 10.1063/1.2773711
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Quasilinear theory of interchange modes in a closed field line configuration

Abstract: Two important issues for any magnetic fusion configuration are the maximum achievable values of beta and energy confinement time when ideal magnetohydrodynamic (MHD) modes are excited. It is well known that the excitation of the MHD unstable modes typically can lead to violent restructuring of the plasma profiles. The particle and energy transport associated with these modes normally dominates all other transport mechanisms and can lead to plasma disruptions and a rapid loss of energy. This paper analytically … Show more

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Cited by 10 publications
(18 citation statements)
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“…The resulting transport equations determine stationary density and pressure profiles and the direction of the associated turbulence-driven fluxes. When the wave-particle interaction is independent of pitch angle, the kinetic transport equations become identical to the MHD quasi-linear transport equations 6 . The experimental observation of stationary profiles thus can serve as an indicator that turbulence-driven cross-field transport is broadband and of sufficient level to dominate transport processes.…”
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confidence: 95%
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“…The resulting transport equations determine stationary density and pressure profiles and the direction of the associated turbulence-driven fluxes. When the wave-particle interaction is independent of pitch angle, the kinetic transport equations become identical to the MHD quasi-linear transport equations 6 . The experimental observation of stationary profiles thus can serve as an indicator that turbulence-driven cross-field transport is broadband and of sufficient level to dominate transport processes.…”
mentioning
confidence: 95%
“…It has been shown from a quasi-linear development of MHD 6,14 that low frequency fluctuations that satisfy a "random phase approximation" lead to transport that can be described as a diffusion in flux space 6,13,14 identical to Eqs. (6). In the absense of particle and heating sources, the particle number within a flux tube, N = ndl /B ≡ nU , and the entropy density parameter, S ≡ pU γ , are stationary when they are uniform.…”
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confidence: 99%
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“…A density profile with hni / 1=VðLÞ $ L À4 [ Fig. 3] corresponds to a uniform number of particles in a flux tube, which is the marginal stability profile for rotationally driven interchange modes in a dipole plasma [11], and the stationary profile resulting from turbulent interchange mixing [2,12].…”
mentioning
confidence: 99%
“…The marginally stable case to both drift waves and MHD modes, is thus where: This case corresponds to an equal number of particles and entropy per flux tube. These profiles are the expected result of sufficient interchange mixing [8], and they form the design basis for attractive dipole fusion reactor concepts [9].…”
Section: Introductionmentioning
confidence: 99%