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Development of submillimeter-wave camera for Atacama Submillimeter Telescope Experiment

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5 Author(s)
Matsuo, H. ; Adv. Technol. Center, Nat. Astron. Obs., Tokyo, Japan ; Ariyoshi, S. ; Akahori, H. ; Takeda, M.
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Submillimeter-wave focal plane arrays based on superconducting direct detectors are designed to be used on a new 10-m submillimeter-wave telescope in Chile. Niobium tunnel junctions with low leakage current coupled to antenna structures can be sensitive submillimeter-wave direct detectors when high quantum efficiency and low leakage current are realized. Inhomogeneous distributed junctions coupled to log-periodic antennas can be used to realize this. Input coupling of better than 50% is calculated with a bandwidth of more than 60 GHz using low current density inhomogeneous distributed junctions. Their measured leakage current of 5 pA and their shot-noise limited operation suggests that noise equivalent power of less than 10-17 W/Hz0.5 at operating temperature of 0.9 K could be achieved

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Applied Superconductivity, IEEE Transactions on  (Volume:11 ,  Issue: 1 )