Wideband ECE Imaging Upgrade for TEXTOR

A 128 channel 2-D Electron Cyclotron Emission (ECE) Imaging instrument has been routinely used to study MHD physics such as m=1 and m=2 modes on the TEXTOR tokamak. As presently configured, each array element of the 16 element mixer array measures plasma emission at 8 simultaneous frequencies over a 4 GHz span to form a 16$\times $8 image of electron temperature profiles and fluctuations over an area of 16 cm (vertical) by 6 cm (horizontal). This instrument will be upgraded in October 2006 with new wideband ECE electronics which increase the instantaneous frequency coverage by $>$50{\%} to 6.4 GHz with a corresponding increase in horizontal plasma coverage. Arranged in a new modular fashion, the system is easily extended to form a 16$\times $16 system spanning 12.8 GHz by employing two modules per array channel, or as high as 16$\times $24 spanning 19.2 GHz by employing three modules per array channel.