Status and Plans for the Textor Ece Imaging System

The 128 channel 2-D electron cyclotron emission imaging system collects time-resolved 16x8 images of T-e profiles and fluctuations on the TEXTOR tokamak. This instrument was upgraded in February 2007 with new wideband electronics which increased the instantaneous frequency coverage by >50% to 6.4 GHz with a corresponding increase in horizontal plasma coverage. Frequency extenders have been developed to combine modules together to double the instantaneous coverage to 12.8 GHz. A new lens-antenna configuration to be implemented on TEXTOR, employing an array of miniature substrate lenses coupled with front-side local oscillator pumping, shows a significant increase in both RF bandwidth and RF sensitivity over the lens-antenna geometry currently installed on TEXTOR while reducing the level of RF power required to pump the array.