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Observation of Inward Turbulent Particle Transport in Edge Plasma Region of CHS Heliotron/Torsatron

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dc.contributor.authorToi, K
dc.contributor.authorOhkuni, K
dc.contributor.authorShats, Michael
dc.contributor.authorAkiyama, R
dc.contributor.authorGoto, M
dc.contributor.authorIsobe, M
dc.contributor.authorMatsunaga, G
dc.contributor.authorMatsuoka, K
dc.contributor.authorMinami, T
dc.contributor.authorMorita, S
dc.contributor.authorNishimura, S
dc.contributor.authorNomura, I
dc.contributor.authorOkamura, Satoshi
dc.contributor.authorOsakabe, M
dc.contributor.authorShimizu, A
dc.contributor.authorSuzuki, C
dc.contributor.authorTakagi, S
dc.contributor.authorTakahashi, C
dc.contributor.authorTakechi, M
dc.contributor.authorTanaka, K
dc.contributor.authorYoshimura, Yasuo
dc.date.accessioned2015-12-13T22:18:01Z
dc.date.available2015-12-13T22:18:01Z
dc.date.issued2002
dc.date.updated2015-12-11T07:40:39Z
dc.description.abstractReversal of turbulent particle flux near the plasma edge of CHS heliotron/torsatron was observed on various discharge conditions, i.e. during tangential neutral beam injection, electron cyclotron heating at the far edge, and the sawtooth crash. For all cases, the reversal is realized at a narrow particular layer near the plasma edge, when plasma parameters go into low collisionality. The reversal is caused by the change in the cross phase between density (ne) and poloidal electric field (Eθ) fluctuations. The turbulent flux is always inward when the radial electric field shear (E′r) exceeds a certain threshold of ∼1 × 106V m-2. In the sawtoothing plasmas, the arrival of a heat pulse due to the sawtooth crash enhances both ne and Eθ fluctuations but changes the cross phase to π in low-frequency range. As a result, a large inward flux is generated by the sawtooth crash. The particle flux reversal in these cases did not lead to obvious confinement improvement.
dc.identifier.issn0741-3335
dc.identifier.urihttp://hdl.handle.net/1885/71437
dc.publisherInstitute of Physics Publishing
dc.sourcePlasma Physics and Controlled Fusion
dc.subjectKeywords: Carrier concentration; Electric fields; Electron cyclotron resonance; Electrostatics; Tokamak devices; Electron cyclotron heating; Heliotron; Neutral beam injection; Poloidal electric field fluctuations; Radial electric field shear; Sawtooth crash; Torsat
dc.titleObservation of Inward Turbulent Particle Transport in Edge Plasma Region of CHS Heliotron/Torsatron
dc.typeJournal article
local.bibliographicCitation.lastpageA243
local.bibliographicCitation.startpageA237
local.contributor.affiliationToi, K, National Institute for Fusion Science
local.contributor.affiliationOhkuni, K, Nagoya University
local.contributor.affiliationShats, Michael, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationAkiyama, R, National Institute for Fusion Science
local.contributor.affiliationGoto, M, National Institute for Fusion Science
local.contributor.affiliationIsobe, M, National Institute for Fusion Science
local.contributor.affiliationMatsunaga, G, Nagoya University
local.contributor.affiliationMatsuoka, K, National Institute for Fusion Science
local.contributor.affiliationMinami, T, National Institute for Fusion Science
local.contributor.affiliationMorita, S, National Institute for Fusion Science
local.contributor.affiliationNishimura, S, National Institute for Fusion Science
local.contributor.affiliationNomura, I, National Institute for Fusion Science
local.contributor.affiliationOkamura, Satoshi, Hokkaido University
local.contributor.affiliationOsakabe, M, National Institute for Fusion Science
local.contributor.affiliationShimizu, A, Nagoya University
local.contributor.affiliationSuzuki, C, National Institute for Fusion Science
local.contributor.affiliationTakagi, S, Nagoya University
local.contributor.affiliationTakahashi, C, National Institute for Fusion Science
local.contributor.affiliationTakechi, M, Japan Atomic Energy Research Institute
local.contributor.affiliationTanaka, K, National Institute for Fusion Science
local.contributor.affiliationYoshimura, Yasuo, National Institute for Fusion Science
local.contributor.authoruidShats, Michael, u9113958
local.description.notesImported from ARIES
local.description.refereedYes
local.identifier.absfor020204 - Plasma Physics; Fusion Plasmas; Electrical Discharges
local.identifier.ariespublicationMigratedxPub2714
local.identifier.citationvolume44
local.identifier.scopusID2-s2.0-0036573433
local.type.statusPublished Version

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