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

G. Taylor | Zendy; P.C. Efthimion | Zendy; Barbara Jones | Zendy; B. LeBlanc | Zendy; R. Maingi | Zendy

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

Author(s) -

G. Taylor,

P.C. Efthimion,

Barbara Jones,

B. LeBlanc,

R. Maingi

Publication year - 2001

Language(s) - English

Resource type - Reports

DOI - 10.2172/787904

Subject(s) - plasma , torus , mode (computer interface) , atomic physics , electron density , electron , polarization (electrochemistry) , electromagnetic radiation , physics , magnetic field , computational physics , optics , chemistry , nuclear physics , geometry , mathematics , computer science , operating system , quantum mechanics

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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