Transverse coherent density fluctuations at the plasma cutoff layer are modeled by a rippled conducting surface. Two simulations are presented which give the reflectometer back scattered power as functions of ripple wavelength, amplitude, and phase. Results from an experimental simulation of the STOR-M tokamak geometry and a numerical simulation using the Helmholtz integral and a paraxial Gaussian probe beam, agree in showing three ripple wavelength (Λ) sensitivity regions defined by beam radius (w): Short wavelengths Λ/λ≪2w/λ experience large Bragg scattering. Long wavelengths Λ/λ≫10w/λ experience no scattering. Intermediate wavelengths experience complex scattering with strong modulation of reflected power at twice ripple frequency.
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G. D. Conway (1993) studied this question.
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