Local particle flux reversal under strongly sheared flow
The advection of electron density by turbulent E×B flow with linearly varying mean yields a particle flux that can reverse sign at certain locations along the direction of magnetic shear. The effect, calculated for strong flow shear, resides in the density-potential cross phase. It is produced by th...
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| Veröffentlicht in: | Physics of plasmas 2003-04, Vol.10 (4), p.1066-1074 |
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| container_title | Physics of plasmas |
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| creator | Terry, P. W. Newman, D. E. Ware, A. S. |
| description | The advection of electron density by turbulent E×B flow with linearly varying mean yields a particle flux that can reverse sign at certain locations along the direction of magnetic shear. The effect, calculated for strong flow shear, resides in the density-potential cross phase. It is produced by the interplay between the inhomogeneities of magnetic shear and flow shear, but subject to a variety of conditions and constraints. The regions of reversed flux tend to wash out if the turbulence consists of closely spaced modes of different helicities, but survive if modes of a single helicity are relatively isolated. The reversed flux becomes negligible if the electron density response is governed by electron scales while the eigenmode is governed by ion scales. The relationship of these results to experimentally observe flux reversals is discussed. |
| doi_str_mv | 10.1063/1.1559475 |
| format | Article |
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S.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Local particle flux reversal under strongly sheared flow</atitle><jtitle>Physics of plasmas</jtitle><date>2003-04</date><risdate>2003</risdate><volume>10</volume><issue>4</issue><spage>1066</spage><epage>1074</epage><pages>1066-1074</pages><issn>1070-664X</issn><eissn>1089-7674</eissn><coden>PHPAEN</coden><abstract>The advection of electron density by turbulent E×B flow with linearly varying mean yields a particle flux that can reverse sign at certain locations along the direction of magnetic shear. The effect, calculated for strong flow shear, resides in the density-potential cross phase. It is produced by the interplay between the inhomogeneities of magnetic shear and flow shear, but subject to a variety of conditions and constraints. The regions of reversed flux tend to wash out if the turbulence consists of closely spaced modes of different helicities, but survive if modes of a single helicity are relatively isolated. The reversed flux becomes negligible if the electron density response is governed by electron scales while the eigenmode is governed by ion scales. The relationship of these results to experimentally observe flux reversals is discussed.</abstract><doi>10.1063/1.1559475</doi><tpages>9</tpages></addata></record> |
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| identifier | ISSN: 1070-664X |
| ispartof | Physics of plasmas, 2003-04, Vol.10 (4), p.1066-1074 |
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| source | AIP Journals Complete; AIP Digital Archive |
| title | Local particle flux reversal under strongly sheared flow |
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