Intermittent turbulence and turbulent structures in a linear magnetized plasma

T. A. Carter

doi:10.1063/1.2158929

Intermittent turbulence and turbulent structures in a linear magnetized plasma

T. A. Carter

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155 Scopus citations

Abstract

Strongly intermittent turbulence is observed in the shadow of a limiter in the large plasma device at UCLA [W. Gekelman, Rev. Sci. Instrum. 62, 2875 (1991)]. The amplitude probability distribution function 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.

Original language	English
Article number	010701
Pages (from-to)	1-4
Number of pages	4
Journal	Physics of Plasmas
Volume	13
Issue number	1
DOIs	https://doi.org/10.1063/1.2158929
State	Published - Jan 2006
Externally published	Yes

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10.1063/1.2158929

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AB - Strongly intermittent turbulence is observed in the shadow of a limiter in the large plasma device at UCLA [W. Gekelman, Rev. Sci. Instrum. 62, 2875 (1991)]. The amplitude probability distribution function 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.

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Intermittent turbulence and turbulent structures in a linear magnetized plasma

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