TRANSPORT FROM OVERLAPPING ELECTRON AND ION DRIFTWAVE INSTABILITIES

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The electron temperature gradient (ETG) mode is a likely contributor to electron thermal transport in tokamaks. The ETG modes are dominantly unstable for poloidal wavelengths shorter than the ion gyroradius (high-k) where the ion response is adiabatic. Thus, they do not directly produce ion thermal or momentum transport or particle transport. Two potential mechanisms whereby ETG modes could produce transport in these channels are explored in this paper: a nonlinear coupling between high-k ETG modes and ions at low-k and a direct coupling when ETG modes and ion temperature gradient (ITG) modes are unstable in overlapping wavenumber ranges. It will ... continued below

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STAEBLER,G.M; KINSEY,J.E & WALTZ,R.E July 2, 2004.

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The electron temperature gradient (ETG) mode is a likely contributor to electron thermal transport in tokamaks. The ETG modes are dominantly unstable for poloidal wavelengths shorter than the ion gyroradius (high-k) where the ion response is adiabatic. Thus, they do not directly produce ion thermal or momentum transport or particle transport. Two potential mechanisms whereby ETG modes could produce transport in these channels are explored in this paper: a nonlinear coupling between high-k ETG modes and ions at low-k and a direct coupling when ETG modes and ion temperature gradient (ITG) modes are unstable in overlapping wavenumber ranges. It will be shown that the particle and momentum transport required to match experiment is small compared to the ETG driven electron thermal transport. Even quasilinearly ETG modes can produce ion transport if the ITG and ETG modes are both unstable at low-k. The implications of this for transport will be explored at the quasilinear level. A new gyro-Landau-fluid (GLF) closure model has been constructed in order to build a transport model which can include the coupling between electron and ion modes including trapped particles. The first growth rate spectra from this model will be shown to give an accurate approximation to the kinetic linear growth rates of drift-ballooning modes in tokamaks.

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  • 31st EUROPEAN CONF. ON PLASMA PHYSICS AND CONTROLLED FUSION, LONDON, UNITED KINGDOM, JUNE 28 THROUGH JULY 2,2004 AND TO BE PUBLISHED IN THE PROCEEDINGS.

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  • Report No.: GA-A24744
  • Grant Number: FG03-95ER54309
  • Office of Scientific & Technical Information Report Number: 828534
  • Archival Resource Key: ark:/67531/metadc786358

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • July 2, 2004

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  • Dec. 3, 2015, 9:30 a.m.

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  • Dec. 9, 2016, 7:28 p.m.

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STAEBLER,G.M; KINSEY,J.E & WALTZ,R.E. TRANSPORT FROM OVERLAPPING ELECTRON AND ION DRIFTWAVE INSTABILITIES, article, July 2, 2004; United States. (digital.library.unt.edu/ark:/67531/metadc786358/: accessed June 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.