Penetration And Scattering Of Lower Hybrid Waves By Density Fluctuations

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dc.contributor.utaustinauthorHorton, W.en
dc.creatorHorton, W.en
dc.creatorGoniche, M.en
dc.creatorPeysson, Y.en
dc.creatorDecker, J.en
dc.creatorEkedahl, A.en
dc.creatorLitaudon, X.en
dc.date.accessioned2015-04-16T13:58:00Zen
dc.date.available2015-04-16T13:58:00Zen
dc.date.issued2014-06en
dc.description.abstractLower Hybrid [LH] ray propagation in toroidal plasma is controlled by a combination of the azimuthal spectrum launched from the antenna, the poloidal variation of the magnetic field, and the scattering of the waves by the density fluctuations. The width of the poloidal and radial RF wave spectrum increases rapidly as the rays penetrate into higher density and scatter from the turbulence. The electron temperature gradient [ETG] spectrum is particularly effective in scattering the LH waves due to its comparable wavelengths and parallel phase velocities. ETG turbulence is also driven by the radial gradient of the electron current density giving rise to an anomalous viscosity spreading the LH-driven plasma currents. The scattered LH spectrum is derived from a Fokker-Planck equation for the distribution of the ray trajectories with a diffusivity proportional to the fluctuations. The LH ray diffusivity is large giving transport in the poloidal and radial wavenumber spectrum in one -or a few passes - of the rays through the core plasma.en
dc.description.departmentInstitute for Fusion Studiesen
dc.identifier.citationW. Horton, M. Goniche, Y. Peysson, J. Decker, A. Ekedahl, and X. Litaudon. AIP Conference Proceedings 1580, 446 (Jun., 2014); doi: 10.1063/1.4864584en
dc.identifier.doi10.1063/1.4864584en
dc.identifier.issn0094-243Xen
dc.identifier.urihttp://hdl.handle.net/2152/29347en
dc.language.isoEnglishen
dc.relation.ispartofserialRadiofrequency Power in Plasmasen_US
dc.rightsAdministrative deposit of works to UT Digital Repository: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en
dc.subjectlower hybrid heatingen
dc.subjectlower hybrid current driveen
dc.subjectdiffusion of raysen
dc.subjectcurrent driveen
dc.subjectphysics, applieden
dc.subjectphysics, fluids & plasmasen
dc.titlePenetration And Scattering Of Lower Hybrid Waves By Density Fluctuationsen
dc.typeConference proceedingsen

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