Lei L, Tobias B, Domier C W, Luhmann N C, Kramer G J, Valeo E J, Lee W, Yun G S, Park H K
University of California at Davis, Davis, California 95616, USA.
Rev Sci Instrum. 2010 Oct;81(10):10D904. doi: 10.1063/1.3464461.
The first microwave imaging reflectometry (MIR) system for characterization of fluctuating plasma density has been implemented for the TEXTOR tokamak [H. Park et al., Rev. Sci. Instrum. 75, 3787 (2004)]; an improved MIR system will be installed on DIII-D and KSTAR. The central issue remains in preserving phase information by addressing antenna coupling between the reflection layer and the detector array in the presence of plasma turbulence. A synthetic diagnostic making use of coupled full-wave diffractive codes has been developed in geometries and applied to a variety of optical arrangements. The effectiveness of each scheme is quantitatively compared with respect to the fluctuation levels accessible in the simulation.
