ECEI/MIR on KSTAR: Conceptual Design

A plasma imaging diagnostic is being developed for the KSTAR tokamak to image electron temperature $T_{e}$ profiles and fluctuations via Electron Cyclotron Emission Imaging (ECEI) and electron density $n_{e}$ fluctuations via Microwave Imaging Reflectometry (MIR). The envisioned ECEI system consists of a pair of 32 element mixer arrays which span a frequency range of 172-216 GHz, yielding a 32$\times $48 or 1536 channel $T_{e}$ image. The MIR system consists of a pair of 20 element mixer arrays with a frequency range of 104-152 GHz, yielding a 20$\times $16 or 320 channel $n_{e}$ fluctuation image. Use of in-vessel reflective optics permits both systems to view the KSTAR plasma through a relatively small vacuum window. System details, including preliminary optical and electronics designs, will be presented.