Increased resolution ECE imaging of temperature profiles/fluctuations in tokamak plasmas

Summary form only given. Electron cyclotron emission imaging (ECEI) is a passive radiometric imaging diagnostic technique in which broadband ECE radiation is collected by one or more 1-D imaging array to generate 2-D localized, time-resolved electron temperature T_e images. Translatable optics allow each imaging array to independently focus on different portions of the plasma, forming up to 24 (v) × 8 (h) = 192 channel images of T_e profiles and fluctuations. Recent advances in ECEI technology now allow for a doubling of the radial (horizontal) resolution by extending the instantaneous IF coverage of each array element from the previous 2-9.2 GHz to 2-16.4 GHz and doubling the number of radial frequency channels from 8 to 16. The first of these high resolution ECEI systems will be on a single array ECEI instrument developed for the EAST tokamak. The technology is readily applied to existing ECEI systems, however, including dual array systems already installed and collecting data on DIII-D and KSTAR.