Internal Kink Mode Dynamics in High-{beta} NSTX Plasmas

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Saturated internal kink modes have been observed in many of the highest toroidal beta discharges of the National Spherical Torus Experiment (NSTX). These modes often cause rotation flattening in the plasma core, can degrade energy confinement, and in some cases contribute to the complete loss of plasma angular momentum and stored energy. Characteristics of the modes are measured using soft X-ray, kinetic profile, and magnetic diagnostics. Toroidal flows approaching Alfvenic speeds, island pressure peaking, and enhanced viscous and diamagnetic effects associated with high-beta may contribute to mode nonlinear stabilization. These saturation mechanisms are investigated for NSTX parameters and compared to ... continued below

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856 Kilobytes pages

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Menard, J.E.; Bell, R.E.; Fredrickson, E.D.; Gates, D.A.; Kaye, S.M.; LeBlanc, B.P. et al. December 22, 2004.

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Saturated internal kink modes have been observed in many of the highest toroidal beta discharges of the National Spherical Torus Experiment (NSTX). These modes often cause rotation flattening in the plasma core, can degrade energy confinement, and in some cases contribute to the complete loss of plasma angular momentum and stored energy. Characteristics of the modes are measured using soft X-ray, kinetic profile, and magnetic diagnostics. Toroidal flows approaching Alfvenic speeds, island pressure peaking, and enhanced viscous and diamagnetic effects associated with high-beta may contribute to mode nonlinear stabilization. These saturation mechanisms are investigated for NSTX parameters and compared to experimental data.

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856 Kilobytes pages

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INIS; OSTI as DE00836571

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  • Other Information: PBD: 22 Dec 2004

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  • Report No.: PPPL-4036
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/836571 | External Link
  • Office of Scientific & Technical Information Report Number: 836571
  • Archival Resource Key: ark:/67531/metadc780968

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  • December 22, 2004

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  • Dec. 3, 2015, 9:30 a.m.

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  • June 10, 2016, 6:40 p.m.

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Menard, J.E.; Bell, R.E.; Fredrickson, E.D.; Gates, D.A.; Kaye, S.M.; LeBlanc, B.P. et al. Internal Kink Mode Dynamics in High-{beta} NSTX Plasmas, report, December 22, 2004; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc780968/: accessed November 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.