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Magnetic Fluctuation Driven Cross-field Particle Transport in the RFP
KTH. (Fusionsplasmafysik)ORCID iD: 0000-0001-6379-1880
1997 (English)In: Physics of Plasmas, ISSN 1070-664X, E-ISSN 1089-7674, Vol. 4, p. 3620-Article in journal (Refereed) Published
Abstract [en]

Electrostatic and electromagnetic fluctuationsgenerally cause cross-field particle transport in confined plasmas. Thus core localized turbulence must be kept at low levels for sufficient energy confinement in magnetic fusion plasmas. Reversed-field pinch (RFP) equilibria can, theoretically, be completely stable to ideal and resistive (tearing) magnetohydrodynamic(MHD) modes at zero beta. Unstable resistive interchange modes are, however, always present at experimentally relevant values of the poloidal beta βθ.An analytical quasilinear, ambipolar diffusion model is here used to model associated particle transport. The results indicate that core density fluctuations should not exceed a level of about 1% for plasmas of fusion interest. Parameters of experimentally relevant stationary states of the RFP were adjusted to minimize growth rates, using a fully resistive linearized MHDstability code. Density gradient effects are included through employing a parabolic density profile. The scaling of particle diffusion (D(r)∝λ**2*n**0.5*T/aB, where λ is the mode width) is such that the effects of particle transport are milder in present day RFP experiments than in future reactor-relevant plasmas.

Place, publisher, year, edition, pages
1997. Vol. 4, p. 3620-
National Category
Natural Sciences
Research subject
Physics
Identifiers
URN: urn:nbn:se:kth:diva-240847DOI: 10.1063/1.872257OAI: oai:DiVA.org:kth-240847DiVA, id: diva2:1275082
Note

QCR 20190128

Available from: 2019-01-04 Created: 2019-01-04 Last updated: 2019-01-28Bibliographically approved

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