Open AccessTurbulence Scattering of High Harmonic Fast Waves
Author(s) -
M. Ono,
J. Hosea,
B. LeBlanc,
J. Ménard,
C. K. Phillips,
R. Wilson,
P. M. Ryan,
D. Swain,
J.B. Wilgen,
S. Kubota,
Mau
Publication year - 2001
Language(s) - English
Resource type - Reports
DOI - 10.2172/786532
Subject(s) - scattering , physics , turbulence , wavelength , computational physics , harmonic , plasma , optics , atomic physics , mechanics , acoustics , quantum mechanics
Effect of scattering of high-harmonic fast-magnetosonic waves (HHFW) by low-frequency plasma turbulence is investigated. Due to the similarity of the wavelength of HHFW to that of the expected low-frequency turbulence in the plasma edge region, the scattering of HHFW can become significant under some conditions. The scattering probability increases with the launched wave parallel-phase-velocity as the location of the wave cut-off layer shifts toward the lower density edge. The scattering probability can be reduced significantly with higher edge plasma temperature, steeper edge density gradient, and magnetic field. The theoretical model could explain some of the HHFW heating observations on the National Spherical Torus Experiment (NSTX)