At the first stage of the electron cyclotron emission imaging(ECEI)diagnosticproject on HT-7,a 16-channel vertical-resolved ECEI diagnostic has been developed and installedon HT-7 tokamak to measure electron cyclotron emission with a temporal resolution of 0.5 μsec.The system works at a fixed frequency of 97.5 GHz.The sample volumes of the system arealigned vertically with a vertical channel spacing of 11 mm,and can be shifted across the plasmacross-section by varying the toroidal magnetic field.The high spatial resolution of the system isachieved by utilizing a low-cost linear mixer/receiver array and an optical imaging system.Thefocus location may be shifted horizontally when translating one of the optical imaging elements.The details of the system design and laboratory testing of the ECEI optics are presented togetherwith the preliminary experimental results.
