Intermittent turbulence and turbulent structures in LAPD and et

T. A. Carter, D. C. Pace, A. E. White, J. L. Gauvreau, P. A. Gourdain, L. Schmitz, R. J. Taylor

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Strongly intermittent turbulence is observed in the shadow of a limiter in the Large Plasma Device (LAPD) and in both the inboard and outboard scrape-off-layer (SOL) in the Electric Tokamak (ET) at UCLA. In LAPD, the amplitude probability distribution function (PDF) of the turbulence is strongly skewed, with density depletion events (or "holes") dominant in the high density region and density enhancement events (or "blobs") dominant in the low density region. Two-dimensional cross-conditional averaging shows that the blobs are detached, outward-propagating filamentary structures with a clear dipolar potential while the holes appear to be part of a more extended turbulent structure. A statistical study of the blobs reveals a typical size of ten times the ion sound gyroradius and a typical velocity of one tenth the sound speed. In ET, intermittent turbulence is observed on both the inboard and outboard midplane.

Original languageEnglish
Title of host publicationPLASMA AND FUSION SCIENCE
Subtitle of host publication16th IAEA Technical Meeting on Research using Small Fusion Devices; XI Latin American Workshop on Plasma Physics
Pages59-65
Number of pages7
DOIs
StatePublished - 2006
Externally publishedYes
EventPLASMA AND FUSION SCIENCE: 16th IAEA Technical Meeting on Research using Small Fusion Devices; XI Latin American Workshop on Plasma Physics - Mexico-City, Mexico
Duration: Nov 30 2006Dec 9 2006

Publication series

NameAIP Conference Proceedings
Volume875
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

ConferencePLASMA AND FUSION SCIENCE: 16th IAEA Technical Meeting on Research using Small Fusion Devices; XI Latin American Workshop on Plasma Physics
Country/TerritoryMexico
CityMexico-City
Period11/30/0612/9/06

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