SCATTERING OF REFLECTOMETER SIGNALS FROM RIPPLED SURFACES

被引：19
作者：
CONWAY, GD
机构：
[1] Department of Physics, University of Saskatchewan, Saskatoon
来源：
REVIEW OF SCIENTIFIC INSTRUMENTS | 1993年 / 64卷 / 10期
关键词：
D O I：
10.1063/1.1144417
中图分类号：
TH7 [仪器、仪表];
学科分类号：
0804 ; 080401 ; 081102 ;
摘要：
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 (LAMBDA) sensitivity regions defined by beam radius (w): Short wavelengths LAMBDA/lambda much less than 2w/lambda experience large Bragg scattering. Long wavelengths LAMBDA/lambda much greater than 10w/lambda experience no scattering. Intermediate wavelengths experience complex scattering with strong modulation of reflected power at twice ripple frequency.
引用
收藏
页码：2782 / 2788
页数：7
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