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Particle transport of LHD

Tanaka, K.; Kawahata, Kazuo; Tokuzawa, Tokihiko; Akiyama, T.; Yokoyama, M.; Shoji, M.; Michael, Clive; Vyacheslavov, Leonid; Murakami, S.; Wakasa, Arimitsu; Mishchenko, A.

Description

Particle confinement processes are studied in detail on the Large Helical Device (LHD). Diffusion coefficients (D) and convection velocities (V) are estimated from density modulation experiments. The magnetic configuration and collisionality are widely scanned in order to investigate parameter dependences of D and V. To study the effect of the magnetic configuration, magnetic axis positions (Rax) are scanned from 3.5 to 3.9 m. This scan changes the magnetic ripples quite significantly, enabling...[Show more]

dc.contributor.authorTanaka, K.
dc.contributor.authorKawahata, Kazuo
dc.contributor.authorTokuzawa, Tokihiko
dc.contributor.authorAkiyama, T.
dc.contributor.authorYokoyama, M.
dc.contributor.authorShoji, M.
dc.contributor.authorMichael, Clive
dc.contributor.authorVyacheslavov, Leonid
dc.contributor.authorMurakami, S.
dc.contributor.authorWakasa, Arimitsu
dc.contributor.authorMishchenko, A.
dc.date.accessioned2015-12-08T22:43:20Z
dc.identifier.issn1536-1055
dc.identifier.urihttp://hdl.handle.net/1885/37235
dc.description.abstractParticle confinement processes are studied in detail on the Large Helical Device (LHD). Diffusion coefficients (D) and convection velocities (V) are estimated from density modulation experiments. The magnetic configuration and collisionality are widely scanned in order to investigate parameter dependences of D and V. To study the effect of the magnetic configuration, magnetic axis positions (Rax) are scanned from 3.5 to 3.9 m. This scan changes the magnetic ripples quite significantly, enabling the effects of neoclassical properties on measured values to be widely elucidated. Dependences of electron temperature (Te) and helically trapped normalized collisionality are examined using the heating power scan of neutral beam injection. It was found that generally larger (or smaller) contributions of neoclassical transport in the core region, where normalized position p < 0.7, resulted in more hollow (or peaked) density profiles. The larger neoclassical contribution was found to be situated at a more outwardly shifted Rax for the same T e and for higher Te or lower v*h at each Rax. However, it is to be noted that R ax = 3.5 m shows different characteristics from these trends, that is, a more peaked density profile at higher Te or lower v *h. The edge (p > 0.7) diffusion and convection are dominated by anomalous processes. Measured edge turbulence shows a possible linkage.
dc.publisherAmerican Nuclear Society
dc.sourceFusion Science and Technology
dc.subjectKeywords: Collisionality; Convection velocity; Core region; Density modulation; Density profile; Diffusion and convection; Diffusion coefficients; Edge turbulence; Heating power; Higher T; Large helical device; Magnetic axis; Magnetic configuration; Magnetic ripple Neoclassical transport; Particle transport; Turbulence
dc.titleParticle transport of LHD
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume58
dc.date.issued2010
local.identifier.absfor020204 - Plasma Physics; Fusion Plasmas; Electrical Discharges
local.identifier.ariespublicationu4695161xPUB146
local.type.statusPublished Version
local.contributor.affiliationTanaka, K, National Institute for Fusion Science
local.contributor.affiliationKAWAHATA, Kazuo , National Institute for Fusion Science
local.contributor.affiliationTOKUZAWA, Tokihiko, National Institute for Fusion Science
local.contributor.affiliationAkiyama, T, National Institute for Fusion Science
local.contributor.affiliationYokoyama, M, National Institute for Fusion Science
local.contributor.affiliationShoji, M., National Institute for Fusion Science
local.contributor.affiliationMichael, Clive, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationVYACHESLAVOV, Leonid, Budker Institute of Nuclear Physics
local.contributor.affiliationMurakami, S, Kyoto University
local.contributor.affiliationWAKASA, Arimitsu , Kyoto University
local.contributor.affiliationMishchenko, A., Max Planck Institut für Plasmaphysik
local.description.embargo2037-12-31
local.bibliographicCitation.issueJuly/August
local.bibliographicCitation.startpage70
local.bibliographicCitation.lastpage90
dc.date.updated2016-02-24T11:18:31Z
local.identifier.scopusID2-s2.0-77956656184
CollectionsANU Research Publications

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