Two-dimensional full-wave simulation of microwave reflectometry on AlcatorC-Mod

A new two-dimensional full-wave code has been developed to simulate ordinar y (O) mode reflectometry signals caused by plasma density fluctuations. The code uses the finite-difference time-domain method with a perfectly matche d layer absorption boundary to solve Maxwell's equations. Huygens wave sour ces are incorporated to generate Gaussian beams. The code has been used to simulate the reflectometer measurement of the quasicoherent mode (60-250 kH z) associated with enhanced D-alpha (EDA) H modes in the Alcator C-Mod toka mak. It is found that an analysis of the realistic experimental layout is e ssential for the quantitative interpretation of the mode amplitude. (C) 200 1 American Institute of Physics.