Enhanced Conversion of Thermal Electron Bernstein Waves to the Extraordinary Electromagnetic Mode on the National Spherical Torus Experiment (NSTX)

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A four-fold increase in the conversion of thermal electron-Bernstein waves (EBW) to the extraordinary mode (X-mode) was measured when the density scale length (L subscript ''n'') was progressively shortened by a local Boron nitride limiter in the scrape-off of an ohmically heated National Spherical Torus Experiment (NSTX) plasma [M. Ono, S. Kaye, M. Peng, et al., Proceedings 17th IAEA Fusion Energy Conference (IAEA, Vienna, Austria, 1999), Vol. 3, p. 1135]. The maximum conversion efficiency approached 50% when L subscript ''n'' was reduced to 0.7 cm, in agreement with theoretical predictions that used locally measured L subscript ''n''. Calculations indicate that ... continued below

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8.7 Megabytes pages

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Taylor, G.; Efthimion, P.C.; Jones, B.; LeBlanc, B.P.; Wilson, J.R.; Wilgen, J.B. et al. October 15, 2002.

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Description

A four-fold increase in the conversion of thermal electron-Bernstein waves (EBW) to the extraordinary mode (X-mode) was measured when the density scale length (L subscript ''n'') was progressively shortened by a local Boron nitride limiter in the scrape-off of an ohmically heated National Spherical Torus Experiment (NSTX) plasma [M. Ono, S. Kaye, M. Peng, et al., Proceedings 17th IAEA Fusion Energy Conference (IAEA, Vienna, Austria, 1999), Vol. 3, p. 1135]. The maximum conversion efficiency approached 50% when L subscript ''n'' was reduced to 0.7 cm, in agreement with theoretical predictions that used locally measured L subscript ''n''. Calculations indicate that it is possible to establish L subscript ''n'' < 0.3 cm with a local limiter, a value predicted to attain approximately 100% EBW conversion to the X-mode in support of proposed EBW heating and current drive scenarios.

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8.7 Megabytes pages

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INIS; OSTI as DE00809850

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  • Other Information: PBD: 15 Oct 2002

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  • Report No.: PPPL-3757
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/809850 | External Link
  • Office of Scientific & Technical Information Report Number: 809850
  • Archival Resource Key: ark:/67531/metadc738081

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  • October 15, 2002

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  • Oct. 18, 2015, 6:40 p.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.; Wilson, J.R.; Wilgen, J.B. et al. Enhanced Conversion of Thermal Electron Bernstein Waves to the Extraordinary Electromagnetic Mode on the National Spherical Torus Experiment (NSTX), report, October 15, 2002; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc738081/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.