PPPL-3659 is available in <a href="PPPL-3659.pdf">pdf</a> format.

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<b>Enhanced Mode Conversion of Thermally Emitted Electron Bernstein Waves (EBW) to Extraordinary Mode</b>
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<b>Authors:</b> B. Jones, P.C. Efthimion, G. Taylor, T. Munsat, J.R. Wilson, J.C. Hosea,
R. Kaita, R. Majeski, R. Maingi, S. Shiraiwa, and J. Spaleta 
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<b>Date of PPPL Report:</b> January 2002
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<b>Published in:</b> Physical Review Letters <b>90</b> (April 2003) No. 16, 165001-1 - 165001-4.</p>

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In the CDX-U spherical torus, approximately 100% conversion of thermal EBWs to X-mode has been observed by controlling the electron density scale length (L<sub>n</sub>) in the conversion region with a local limiter outside the last closed flux surface. The radiation temperature profile agrees with Thomson scattering electron temperature data. Results are consistent with theoretical calculations of conversion efficiency using measured L<sub>n</sub>. By reciprocity of the conversion process, prospects for efficient coupling in EBW heating and current drive scenarios are strongly supported.




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