Correlation between excitation of Alfven modes and degradation of ICRF heating efficiency in TFTR

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Alfven modes are excited by energetic ions in TFTR during intense minority ICRF heating. There is a clear threshold in rf power above which the modes are destabilized. The net effect of these modes is the increase of the fast ion losses, with an associated saturation of the ion tail energy and of the efficiency of the heating. Typically, several modes are excited with progressive n-numbers, with frequencies in the neighborhood of 200 kHz. Results suggest that Energetic Particle Modes (EPM), mostly unseen by the Mirnov coils, are generated near the center and are responsible for the ion losses. Stronger ... continued below

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7 p.

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Bernabei, S.; Chang, Z. & Darrow, D. May 1, 1997.

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Description

Alfven modes are excited by energetic ions in TFTR during intense minority ICRF heating. There is a clear threshold in rf power above which the modes are destabilized. The net effect of these modes is the increase of the fast ion losses, with an associated saturation of the ion tail energy and of the efficiency of the heating. Typically, several modes are excited with progressive n-numbers, with frequencies in the neighborhood of 200 kHz. Results suggest that Energetic Particle Modes (EPM), mostly unseen by the Mirnov coils, are generated near the center and are responsible for the ion losses. Stronger global TAE modes, which are destabilized by the stream of displaced fast ions, appear responsible only for minor losses.

Physical Description

7 p.

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Also available from the following url: http://www.pppl.gov. See PPPL reports section for full text.; OSTI as DE97053287

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  • Other Information: PBD: May 1997

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  • Other: DE97053287
  • Report No.: PPPL--3248
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/304148 | External Link
  • Office of Scientific & Technical Information Report Number: 304148
  • Archival Resource Key: ark:/67531/metadc680309

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  • May 1, 1997

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  • July 25, 2015, 2:20 a.m.

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  • April 15, 2016, 8:04 p.m.

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Bernabei, S.; Chang, Z. & Darrow, D. Correlation between excitation of Alfven modes and degradation of ICRF heating efficiency in TFTR, report, May 1, 1997; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc680309/: accessed May 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.