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• W8254956 abstract "A dual polarization SIS heterodyne receiver is being built for use on the Large Millimeter Telescope (LMT). The LMT is a 50 m diameter millimeter-wavelength telescope being built in Mexico as a joint project between UMass and Instituto Nacional de Astrofisica, Optica, y ElectrOnica (INAOE) in Mexico. The receiver is designed to operate in the 210 — 275 GHz atmospheric window, and will provide state-ofthe-art sensitivity using a sideband separation scheme to separate the upper and lower sidebands. In each polarization, 8 GHz of effective bandwidth per sideband (16 GHz total) will be available without the use of cumbersome mechanical tuners. Due to the prevailing physical conditions in the interstellar medium of galactic and extra-galactic sources, the 1 mm band is expected to be the workhorse scientific band for the LMT. The SIS receiver will also handle the necessary requirements of a commissioning receiver. The receiver will be mounted at the Cassegrain focus of the LMT, and will employ a waveguide-based OMT. Each polarization output of the OMT will enter a split block waveguide mixer block, which will contain the passive in phase and quadrature hybrids for the LO signal and RF signals respectively. Two single-ended S1S junctions of the same design as that used in the ALMA Band 6 mixers will be used. The IF outputs of the two mixers are amplified using 4-12 Gliz IF amplifiers, and then passed through a quadrature IF hybrid to separate out the sidebands. The entire receiver system will be housed in a cryostat equipped with a closed cycle 4 K refrigerator. A new generation of bias electronics has been designed, which is interfaced to the control computer using a simple 2-wire 1 2 C communication protocol. The design of the entire receiver system has been optimized to allow the individual subsystems to be scaled up to an eventual large format focal plane array receiver system at 1 mm wavelength for the LMT." @default.
• W8254956 created "2016-06-24" @default.
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• W8254956 date "2004-01-01" @default.
• W8254956 modified "2023-09-24" @default.
• W8254956 title "A Dual Polarization Sideband Separation SIS Receiver for the Large Millimeter Telescope" @default.
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