Efficient Coupling of Thermal Electron Bernstein Waves to the Ordinary Electromagnetic Mode on the National Spherical Torus Experiment (NSTX)

G Taylor G Taylor,J Preinhaelter J Preinhaelter,J.b Wilgen J.B Wilgen,B.p Leblanc B.P Leblanc,P.c Efthimion P.C Efthimion,J.b Caughman J.B Caughman,R.w Harvey R.W Harvey,M.d Carter M.D Carter,S.a Sabbagh S.A Sabbagh

doi:10.2172/836631

Efficient Coupling of Thermal Electron Bernstein Waves to the Ordinary Electromagnetic Mode on the National Spherical Torus Experiment (NSTX)

G Taylor G Taylor, J Preinhaelter J Preinhaelter + Show 7 more

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https://doi.org/10.2172/836631

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Publication Date: Feb 2, 2005

Citations: 1

#Electron Bernstein Waves #National Spherical Torus Experiment + Show 8 more

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Abstract

Efficient coupling of thermal electron Bernstein waves (EBW) to ordinary mode (Omode) electromagnetic radiation has been measured in plasmas heated by energetic neutral beams and high harmonic fast waves in the National Spherical Torus Experiment (NSTX) [M. Ono, S. Kaye, M. Peng, et al., Proceedings 17th IAEA Fusion Energy Conference (IAEA, Vienna, Austria, 1999), Vol.3, p. 1135]. The EBW to electromagnetic mode coupling efficiency was measured to be 0.8 {+-} 0.2, compared to a numerical EBW modeling prediction of 0.65. The observation of efficient EBW coupling to O-mode, in relatively good agreement with numerical modeling, is a necessary prerequisite for implementing a proposed high power EBW current drive system on NSTX.

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