Dual-channel sis receivers for the iram Plateau de Bure Interferometer

Computer Science

Scientific paper

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Millimetrewaves, Receivers, Interferometer

Scientific paper

The five antennas of the Plateau de Bure Interferometer have been instrumented with dual-channel receivers in the λ 3 mm and λ 1 mm bands. Polarisation diplexing allows simultaneous observations in the two bands. Each receiver has ambient and cryogenic calibration loads, and one receiver is equipped with a beam switching chopper for total power flux measurements. Typically the receiver noise temperatures are<50 K in both the λ 3 mm band and the λ 1 mm band. Initial observations show that at 115 GHz the sensitivity is doubled compared to the previous receivers, and high quality fringes have been obtained at 230 GHz. Preliminary experiments show that the receiver stability is good enough to correct atmospheric phase variations by monitoring the fluctuations in atmospheric emission at 225 GHz. VLBI fringes have been detected between one 15-m antenna and the IRAM 30-m antenna in Spain.

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