Enhancement of Mode-converted Electron Bernstein Wave Emission during NSTX H-mode Plasmas

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Description

A sudden, threefold increase in emission from fundamental electrostatic electron Bernstein waves (EBW) which mode convert and tunnel to the electromagnetic X-mode has been observed during H-mode [high-confinement mode] transitions on the National Spherical Torus Experiment (NSTX) spherical torus plasma. The mode-converted EBW emission viewed normal to the magnetic field on the plasma midplane increases when the density profile steepens in the vicinity of the mode-conversion layer, which is located in the plasma scrape off. The measured conversion efficiency during the H-mode is consistent with the calculated EBW to X-mode conversion efficiency derived using edge density data. Calculations indicate that ... continued below

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314 Kilobytes pages

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Taylor, G.; Efthimion, P.C.; Jones, B.; LeBlanc, B.P. & Maingi, R. August 20, 2001.

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Description

A sudden, threefold increase in emission from fundamental electrostatic electron Bernstein waves (EBW) which mode convert and tunnel to the electromagnetic X-mode has been observed during H-mode [high-confinement mode] transitions on the National Spherical Torus Experiment (NSTX) spherical torus plasma. The mode-converted EBW emission viewed normal to the magnetic field on the plasma midplane increases when the density profile steepens in the vicinity of the mode-conversion layer, which is located in the plasma scrape off. The measured conversion efficiency during the H-mode is consistent with the calculated EBW to X-mode conversion efficiency derived using edge density data. Calculations indicate that there may also be a small residual contribution to the measured X-mode electromagnetic radiation from polarization-scrambled, O-mode emission, converted from EBWs.

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314 Kilobytes pages

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INIS; OSTI as DE00787904

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  • Other Information: PBD: 20 Aug 2001

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  • Report No.: PPPL-3598
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/787904 | External Link
  • Office of Scientific & Technical Information Report Number: 787904
  • Archival Resource Key: ark:/67531/metadc723839

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  • August 20, 2001

Added to The UNT Digital Library

  • Sept. 29, 2015, 5:31 a.m.

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  • April 15, 2016, 9:07 p.m.

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Taylor, G.; Efthimion, P.C.; Jones, B.; LeBlanc, B.P. & Maingi, R. Enhancement of Mode-converted Electron Bernstein Wave Emission during NSTX H-mode Plasmas, report, August 20, 2001; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc723839/: accessed August 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.