Study of the Effect of Compressional Alfvin Modes on Thermal Transport in the National Spherical Torus Experiment

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With the first injection of neutral beams into the National Spherical Torus Experiment (NSTX) [Ono, et al., Nucl. Fusion 40 (2000) 557] a broad spectrum of fluctuations consisting of nearly equally spaced peaks in the frequency range from about 0.2 to 1.2 times the ion cyclotron frequency was observed. The frequencies scale with toroidal field and plasma density consistently with Alfvin waves. From these and other observations, the modes have been identified as Compressional Alfvin Eigenmodes (CAE). It has also recently been found that the ratio of the measured ion and electron temperatures in NSTX during neutral-beam heating is anomalously ... continued below

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668 Kilobytes pages

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Fredrickson, E.D.; Gorelenkov, N.; Cheng, C.Z.; Bell, R.; D. Darrow, D. Gates; Johnson, D. et al. February 25, 2002.

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With the first injection of neutral beams into the National Spherical Torus Experiment (NSTX) [Ono, et al., Nucl. Fusion 40 (2000) 557] a broad spectrum of fluctuations consisting of nearly equally spaced peaks in the frequency range from about 0.2 to 1.2 times the ion cyclotron frequency was observed. The frequencies scale with toroidal field and plasma density consistently with Alfvin waves. From these and other observations, the modes have been identified as Compressional Alfvin Eigenmodes (CAE). It has also recently been found that the ratio of the measured ion and electron temperatures in NSTX during neutral-beam heating is anomalously high [Bell, Bull. Am. Phys. Soc. 46 (2001) 206]. To explain the anomaly in the ratio of ion to electron temperature, it has been suggested that the CAE, driven by the beam ions, stochastically heat the thermal ions [Gates, et al., Phys. Rev. Lett. 87 (2001) 205003]. In this paper, it is shown through studies of the power balance that stochastic heating of the thermal ions by the observed CAE alone is not solely responsible for the anomaly in the ion to electron temperature ratio.

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668 Kilobytes pages

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INIS; OSTI as DE00796180

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  • Other Information: PBD: 25 Feb 2002

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  • Report No.: PPPL-3677.pdf
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/796180 | External Link
  • Office of Scientific & Technical Information Report Number: 796180
  • Archival Resource Key: ark:/67531/metadc737285

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  • February 25, 2002

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  • Oct. 19, 2015, 7:39 p.m.

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Fredrickson, E.D.; Gorelenkov, N.; Cheng, C.Z.; Bell, R.; D. Darrow, D. Gates; Johnson, D. et al. Study of the Effect of Compressional Alfvin Modes on Thermal Transport in the National Spherical Torus Experiment, report, February 25, 2002; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc737285/: accessed October 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.