Trapped ion mode in toroidally rotating plasmas

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The influence of radially sheared toroidal flows on the Trapped Ion Mode (TIM) is investigated using a two-dimensional eigenmode code. These radially extended toroidal microinstabilities could significantly influence the interpretation of confinement scaling trends and associated fluctuation properties observed in recent tokamak experiments. In the present analysis, the electrostatic drift kinetic equation is obtained from the general nonlinear gyrokinetic equation in rotating plasmas. In the long perpendicular wavelength limit k{sub {tau}}{rho}{sub bi} {much_lt} 1, where {rho}{sub bi} is the average trapped-ion banana width, the resulting eigenmode equation becomes a coupled system of second order differential equations nmo for the poloidal ... continued below

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52 p.

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Artun, M.; Tang, W.M. & Rewoldt, G. April 1, 1995.

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Description

The influence of radially sheared toroidal flows on the Trapped Ion Mode (TIM) is investigated using a two-dimensional eigenmode code. These radially extended toroidal microinstabilities could significantly influence the interpretation of confinement scaling trends and associated fluctuation properties observed in recent tokamak experiments. In the present analysis, the electrostatic drift kinetic equation is obtained from the general nonlinear gyrokinetic equation in rotating plasmas. In the long perpendicular wavelength limit k{sub {tau}}{rho}{sub bi} {much_lt} 1, where {rho}{sub bi} is the average trapped-ion banana width, the resulting eigenmode equation becomes a coupled system of second order differential equations nmo for the poloidal harmonics. These equations are solved using finite element methods. Numerical results from the analysis of low and medium toroidal mode number instabilities are presented using representative TFTR L-mode input parameters. To illustrate the effects of mode coupling, a case is presented where the poloidal mode coupling is suppressed. The influence of toroidal rotation on a TFTR L-mode shot is also analyzed by including a beam species with considerable larger temperature. A discussion of the numerical results is presented.

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52 p.

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INIS; OSTI as DE95009854

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  • Other Information: PBD: Apr 1995

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  • Other: DE95009854
  • Report No.: PPPL--3093
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/41404 | External Link
  • Office of Scientific & Technical Information Report Number: 41404
  • Archival Resource Key: ark:/67531/metadc688648

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  • April 1, 1995

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • April 15, 2016, 6:54 p.m.

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Artun, M.; Tang, W.M. & Rewoldt, G. Trapped ion mode in toroidally rotating plasmas, report, April 1, 1995; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc688648/: accessed September 26, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.