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High frequency geod...
High frequency geodesic acoustic modes in electron scale turbulence
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- Anderson, Johan, 1973 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Skyman, Andreas, 1982 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Nordman, Hans, 1957 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Singh, Raghvendra (author)
- Institute for Plasma Research India
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- Kaw, P.K. (author)
- Institute for Plasma Research India
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(creator_code:org_t)
- 2013-11-19
- 2013
- English.
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In: Nuclear Fusion. - : IOP Publishing. - 1741-4326 .- 0029-5515. ; 53:12, s. article nr. 123016-
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Abstract
Subject headings
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- In this work the finite β-effects of an electron branch of the geodesic acoustic mode (el-GAM) driven by electron temperature gradient (ETG) modes is presented. The work is based on a fluid description of the ETG mode retaining non-adiabatic ions and the dispersion relation for el-GAMs driven non-linearly by ETG modes is derived. The ETG growth rate from the fluid model is compared with the results found from gyrokinetic simulations with good agreement. A new saturation mechanism for ETG turbulence through the interaction with el-GAMs is found, resulting in a significantly enhanced ETG turbulence saturation level compared with the mixing length estimate. It is shown that the el-GAM may be stabilized by an increase in finite β as well as by increasing non-adiabaticity. The decreased GAM growth rates is due to the inclusion of the Maxwell stress.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
Keyword
- ETG
- Transport Barriers
- Zonal Flows
- GAM
Publication and Content Type
- art (subject category)
- ref (subject category)
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