@article{oai:nifs-repository.repo.nii.ac.jp:00000127,
 author = {KAWAHATA,  Kazuo and NAGAYAMA,  Yoshio and TSUCHIYA,  Hayato and MASE,  Atsushi and KOGI,  Yuichiro and JEONG,  Seung Ho and LEE,  Kyu-Dong and WYLDE,  Richard J.},
 journal = {Plasma and Fusion Research},
 month = {Jul},
 note = {A broadband heterodyne radiometer system has been developed and installed on KSTAR to measure second harmonic electron cyclotron emission (ECE) at the magnetic field of 3 T. The system consisting of two radiometers (110-162 GHz and 164-196 GHz) can cover a frequency range of 110-196 GHz. The unique and key components to construct this ECE diagnostic instrument are specially-designed detector modules and a diplexer for splitting ECE radiation with high efficiency. The minimum detectable electron temperature with a time response of 1 ?s is about 0.23 eV. The observed signal intensity is roughly consistent with the value estimated by using characteristics of various components (waveguide components, sub-harmonic mixers, amplifiers, and intermediate frequency detectors). In this article, design considerations and preliminary ECE measurements will be described.},
 title = {Broadband Multichannel Radiometer for ECE Measurements on KSTAR},
 volume = {Vol.6},
 year = {2011}
}