Edge ion heating by launched high harmonic fast waves in the National Spherical Torus Experiment

T. M. Biewer; R. E. Bell; S. J. Diem; C. K. Phillips; J. R. Wilson; P. M. Ryan

doi:10.1063/1.1871953

Edge ion heating by launched high harmonic fast waves in the National Spherical Torus Experiment

T. M. Biewer, R. E. Bell, S. J. Diem, C. K. Phillips, J. R. Wilson, P. M. Ryan

Research output: Contribution to journal › Article › peer-review

32 Scopus citations

Abstract

The edge ion heating caused by a spectroscopic diagnostic on the National Torus Experiment (NSTX), which measures the velocity distribution of ions in the plasma edge simultaneously along poloidal and toroidal waves, is studied. An anisotropic ion temperature is measured during high power high harmonic fast wave (HHFW) radio frequency heating in helium plasmas. A likely ion heating mechanism was found to be the parametric decay of the launched HHFW into an ion Bernstein wave (IBW). The presence of the IBW in NSTX plasmas during HHFW application was confirmed with probe measurements. The calculations of IBW propagation indicate that multiple waves could be created in the parametric decay process.

Original language	English
Article number	056108
Pages (from-to)	1-7
Number of pages	7
Journal	Physics of Plasmas
Volume	12
Issue number	5
DOIs	https://doi.org/10.1063/1.1871953
State	Published - May 2005
Externally published	Yes

Funding

The authors wish to recognize the many contributions of the NSTX group and collaborators at Oak Ridge National Lab. The authors thank especially Steve Sabbagh of Columbia University for providing the EFIT reconstructions and Benoit LeBlanc of PPPL for Thomson scattering data. This research was supported by the U.S. Department of Energy under Contract: No. DE-AC02-76CH03073.

Funders	Funder number
U.S. Department of Energy	DE-AC02-76CH03073

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abstract = "The edge ion heating caused by a spectroscopic diagnostic on the National Torus Experiment (NSTX), which measures the velocity distribution of ions in the plasma edge simultaneously along poloidal and toroidal waves, is studied. An anisotropic ion temperature is measured during high power high harmonic fast wave (HHFW) radio frequency heating in helium plasmas. A likely ion heating mechanism was found to be the parametric decay of the launched HHFW into an ion Bernstein wave (IBW). The presence of the IBW in NSTX plasmas during HHFW application was confirmed with probe measurements. The calculations of IBW propagation indicate that multiple waves could be created in the parametric decay process.",

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AU - Biewer, T. M.

AU - Bell, R. E.

AU - Diem, S. J.

AU - Phillips, C. K.

AU - Wilson, J. R.

AU - Ryan, P. M.

PY - 2005/5

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AB - The edge ion heating caused by a spectroscopic diagnostic on the National Torus Experiment (NSTX), which measures the velocity distribution of ions in the plasma edge simultaneously along poloidal and toroidal waves, is studied. An anisotropic ion temperature is measured during high power high harmonic fast wave (HHFW) radio frequency heating in helium plasmas. A likely ion heating mechanism was found to be the parametric decay of the launched HHFW into an ion Bernstein wave (IBW). The presence of the IBW in NSTX plasmas during HHFW application was confirmed with probe measurements. The calculations of IBW propagation indicate that multiple waves could be created in the parametric decay process.

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Edge ion heating by launched high harmonic fast waves in the National Spherical Torus Experiment

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