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- W2065907052 abstract "We summarize the development and the delivery of two SIS mixers for the 1.1-1.25 THz band of the heterodyne spectrometer of Herschel Observatory (HSO). The quasi-optical SIS mixer has two Nb/AlN/NbTiN junctions with the area of 0.25 um<sup>2</sup>. The Josephson critical current density in the junction is 30-50 kA/cm<sup>2</sup>. The tuning circuit integrated with SIS junction has the base electrode of Nb and a gold wire layer. With the new SIS mixers the test receiver maximum Y factor is 1.41. The minimum receiver uncorrected DSB noise temperature is 450 K. The SIS receiver noise corrected for the loss in the optics is 350-450 K across the 1100-1250 GHz band. The receiver has a uniform sensitivity in the full IF range of 4-8 GHz. The sub-micron sized SIS junction shape is optimized to ease the suppression of the Josephson current, and the receiver operation is stable. The measured mixer beam pattern is symmetrical and, in a good agreement with the requirements, has the f/d =4.25 at the central frequency of the operation band. The minimum DSB SIS receiver noise is close to 6 hv/k, the lowest value achieved thus far in the THz frequencies range." @default.
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- W2065907052 date "2006-06-14" @default.
- W2065907052 modified "2023-10-01" @default.
- W2065907052 title "Development of 1.25 THz SIS mixer for Herschel Space Observatory" @default.
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- W2065907052 doi "https://doi.org/10.1117/12.684534" @default.
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