Wide-Band Heterodyne-Radiometer with Fast Frequency-Switching Local Oscillator for Electron Cyclotron Emission Diagnostics

In the report, a backward wave oscillator (-100 GHz) was used as a local oscillator. In this work, a fast-switching local oscillator part in lower frequency range was built for higher time resolution. The lower frequency becomes wide-band in millimeter-wave range (-100 GHz) using millimeter multipliers. The local-frequency part plays an important role to determine the frequency switching-time, step-width and total range in the ECE measuremt. The frequency switching of the lower local-frequency part is mainly discussed in this report.