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  On the detection of Reynolds stress as a driving and damping mechanism of geodesic acoustic modes and zonal flows

Ramisch, M., Stroth, U., Niedner, S., & Scott, B. (2003). On the detection of Reynolds stress as a driving and damping mechanism of geodesic acoustic modes and zonal flows. New Journal of Physics, 5: 12. Retrieved from http://www.iop.org/EJ/abstract/1367-2630/5/1/312.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-2314-D Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-2315-B
Genre: Journal Article

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 Creators:
Ramisch, M.1, Author
Stroth, U.2, Author              
Niedner, S.2, Author              
Scott, B.3, Author              
Affiliations:
1Universität Kiel, IEAP, Olshaussenstr 40, D-24098 Kiel, Germany, ou_persistent22              
2External Organizations, ou_persistent22              
3Tokamak Theory (TOK), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856309              

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 Abstract: Bispectral analysis has been proposed as a diagnostic for Reynolds stress (RS) as a driving mechanism of zonal flows (ZF) in toroidally confined plasmas. A turbulence simulation code was used to test this technique on a well-defined system. It turned out that the geodesic acoustic mode dominates the poloidal flow spectrum and that it reduces radial transport in the same way as does a low-frequency ZF. Using the total cross- bicoherence, a correlation between RS and large-scale poloidal flows could be detected. The experimentally more accessible auto-bicoherences did not prove to be a useful quantity for studying this interaction. RS was not observed as a precursor of the flow; rather it appears simultaneously in the region of radial flow shear.

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Language(s): eng - English
 Dates: 2003
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 21130
URI: http://www.iop.org/EJ/abstract/1367-2630/5/1/312
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Title: New Journal of Physics
  Alternative Title : NJP
Source Genre: Journal
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Publ. Info: IOP Publishing Ltd and Deutsche Physikalische Gesellschaft
Pages: - Volume / Issue: 5 Sequence Number: 12 Start / End Page: - Identifier: ISSN: 1367-2630