ISSTT Proceedings

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Gain Bandwidth and Noise Temperature of NbN HEB Mixers with Simultaneous Phonon and Diffusion Cooling

Authors:
A. Maslennikova, I. Tretyakov, S. Ryabchun, M. Finkel, N. Kaurova, B. Voronov, G. Gol'tsman
Abstract:
The space observatory Millimetron will be operating in the millimeter, sub-millimeter and infrared ranges using a 12-m cryogenic telescope in a single-dish mode, and as an interferometer with the space-earth and space-space baselines (the latter after the launch of the second identical space telescope). The observatory will allow performing astronomical observations with an unprecedented sensitivity (down to nJy level) in the single-dish mode, and observations with a high angular resolution in the interferometer mode. The total spectral range 20 µm – 2 cm is separated into 10 bands. HEB mixers with two cooling channels (diffusion and phonon) have been chosen to be the detectors of choice of the system covering the range from 1 THz to 6 THz as the best detectors in terahertz receivers. This type of HEB has already shown good work in the terahertz range. A gain bandwidth of 6 GHz at an LO frequency of 300 GHz and a noise temperature of 750 K at an LO frequency of 2.5 THz are the best values for HEB mixers with two cooling channels. Theoretical estimations predict a bandwidth up to 12 GHz. Reaching such good result demands more systematic and thorough research.
Categories:
Mixers, Superconductors
Year:
2010
Session:
9
Full-text:
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Page Number(s):
218-219