STATUS AND PLANS FOR THE TEXTOR ECE IMAGING SYSTEM
This work is supported by U.S. DOE Grants DE-FG02-99ER54531 and DE-AC02-76CHO307, and by NWO and the Association EURATOM-FOM.
The 128 channel 2-D electron cyclotron emission imaging system collects time-resolved 16 × 8 images of Te 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.
