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  Turbulence regulation and stabilization by equilibrium and Time-varying sheared turbulence flows

McKee, G. R., Fonck, R. J., Jakubowski, M. W., Burrell, K. H., Carlstrom, T. N., Fenzi, C., et al. (2003). Turbulence regulation and stabilization by equilibrium and Time-varying sheared turbulence flows. In Fusion Energy 2002. Vienna: International Atomic Energy Agency.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-0027-3B8A-3 Version Permalink: https://hdl.handle.net/21.11116/0000-0008-8080-5
Genre: Conference Paper

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 Creators:
McKee, G. R.1, Author
Fonck, R. J.1, Author
Jakubowski, M. W.2, Author           
Burrell, K. H.1, Author
Carlstrom, T. N.1, Author
Fenzi, C.1, Author
Groebner, R. J.1, Author
Hallatschek, K.3, 4, Author           
Moyer, R. A.1, Author
Nevins, W.1, Author
Rhodes, T. L.1, Author
Rost, C.1, Author
Rudakov, D.1, Author
Xu, X.1, Author
Affiliations:
1University of Wisconsin, Madison, Madison, USA; General Atomics, San Diego, California, USA; University of California, San Diego, La Jolla, California, USA; Lawrence Livermore National Laboratory, Livermore, California, USA; University of California, Los Angeles, Los Angeles, California, USA; Massachusetts Institute of Technology, Cambridge, Massachusetts, USA; CEA, Cadarache, France, ou_persistent22              
2External Organizations, ou_persistent22              
3Centre for Interdisciplinary Plasma Science (CIPS), Max Planck Institute for Plasma Physics, Max Planck Society, ou_2074325              
4Tokamak Theory (TOK), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856309              

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 Abstract: Turbulence flows are directly measured in a tokamak plasma by applying time-delay-estimation (TDE) analysis to localized 2-D density fluctuation
measurements obtained with Beam Emission Spectroscopy on DIII-D. The equilibrium radial flow shear near the plasma edge (0.8 < r/a < 1) varies strongly with
magnetic geometry. With the ion grad-B drift directed towards the X-point in a single null plasma, a large radial shear in the poloidal flow is measured, while little
shear is observed in the reverse condition. This large shear appears to facilitate the L-to H-mode transition, consistent with the significantly lower LH transition
power threshold in this configuration. In addition, time varying, radially localized (k . ρI < 1) flows with a semi-coherent structure peaked near 15 KHz and a
very long poloidal wavelength, possibly m=0, are observed. These characteristics are very similar to theoretically predicted zonal flows that are self-generated by
and in turn regulate the turbulence.

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Language(s): eng - English
 Dates: 2003
 Publication Status: Issued
 Pages: -
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 Table of Contents: -
 Rev. Type: Internal
 Identifiers: eDoc: 59955
URI: http://www.iaea.org/programmes/ripc/physics/fec2002/pdf/exc4_1ra.pdf
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Title: 19th Fusion Energy Conference
Place of Event: Lyon (FR)
Start-/End Date: 2002-10-14 - 2002-10-19

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Title: Fusion Energy 2002
Source Genre: Proceedings
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Publ. Info: Vienna : International Atomic Energy Agency
Pages: CD-ROM Volume / Issue: - Sequence Number: EX/C4-1Ra Start / End Page: - Identifier: -