Fast ion absorption of the high harmonic fast wave in the National Spherical Torus Experiment

A. L. Rosenberg, J. E. Menard, J. R. Wilson, S. S. Medley, R. Andre, C. K. Phillips, D. S. Darrow, B. P. LeBlanc, M. H. Redi, N. J. Fisch, R. W. Harvey, T. K. Mau, E. F. Jaeger, P. M. Ryan, D. W. Swain, S. A. Sabbagh, J. Egedal

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Abstract

The phenomena of ion absorption of the high harmonic fast wave in a spherical torus was investigated. It was observed that the rf-induced fast ion tail strength and neutron rate at lower B-fields were less enhanced due to a larger β profile. The absorption by fast ions was predicted to be competitive with electron absorption. The study revealed that under some conditions when neutral beam and rf power are injected into the plasma simultaneously, a fast ion population with energy above the beam injection energy is sustained by the wave.

Original languageEnglish (US)
Pages (from-to)2441-2452
Number of pages12
JournalPhysics of Plasmas
Volume11
Issue number5 PART 2
DOIs
StatePublished - May 2004

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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    Rosenberg, A. L., Menard, J. E., Wilson, J. R., Medley, S. S., Andre, R., Phillips, C. K., Darrow, D. S., LeBlanc, B. P., Redi, M. H., Fisch, N. J., Harvey, R. W., Mau, T. K., Jaeger, E. F., Ryan, P. M., Swain, D. W., Sabbagh, S. A., & Egedal, J. (2004). Fast ion absorption of the high harmonic fast wave in the National Spherical Torus Experiment. Physics of Plasmas, 11(5 PART 2), 2441-2452. https://doi.org/10.1063/1.1651099