Performance and Planned Upgrades to the 2-D ECEI Diagnostic on TEXTOR*

In collaboration with PPPL and FOM, UC Davis has developed and installed a 128 channel 2-D Electron Cyclotron Emission Imaging (ECEI) instrument on TEXTOR. In its present form, each array element of the 16 channel mixer array measures plasma emission at 8 simultaneous frequencies to form a 16x8 image of the plasma electron temperature distribution. Details regarding the ECEI system design and current status will be presented along with recent TEXTOR plasma data. A planned upgrade in 2006 will increase the plasma coverage from the 16 cm (vertical) x 6 cm (horizontal) to 18 cm x 12 cm. Designs will also be presented of a proposed 576 channel (24x24 image) system which is capable of visualizing temperature fluctuations over an area of 24 cm x 24 cm.