640 GHz SIS RECEIVER SYSTEM FOR JEM/SMILES ON INTERNATIONAL SPACE STATION

We are developing a superconductor-insulator-superconductor (SIS) receiver for a submillimeterwave limb emission sounder (SMILES) on the Japanese Experiment Module (JEM) of the International Space Station. SMILES is a sensitive heterodyne spectrometric radiometer in 640 GHz band, and observe thermal emission lines of stratospheric trace molecules in the limb sounding method. SMILES operates two SIS mixers simultaneously in sin g le-sideband (SSB)