19 July 2016 A wideband 240 GHz receiver for the submillimeter array
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Abstract
We report on the design of a 240 GHz double-side-band receiver for the Submillimeter Array (SMA). The heart of this receiver is a 3-junction series connected SIS mixer, which allows it to provide intermediate frequency (IF) output up to more than 12 GHz. We have custom built a low noise Amplifier-Multiplier Chain for use as the receiver’s Local Oscillator module, which is tunable from 210 to 270 GHz. The receiver has demonstrated low noise performance in laboratory. 7 out of the 8 SMA antennas are now equipped with this receiver. The receiver has already participated in Event Horizon Telescope observations in April 2016, working with the SMA-200 receiver to provide dual polarization coverage for the EHT Hawaii Station. This receiver has enabled the SMA to provide 32 Gbit per second data stream to the EHT observations. We are currently trying to improve the on-sky beam co-alignment of this receiver with respect to other SMA receivers.
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C.-Y. Edward Tong, Paul K. Grimes, Patrick S. Leiker, Lingzhen Zeng, Wei-Chun Lu, Tse-Jun Chen, Chih-Chiang Han, Ming-Jye Wang, "A wideband 240 GHz receiver for the submillimeter array", Proc. SPIE 9914, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII, 99140F (19 July 2016); doi: 10.1117/12.2232776; https://doi.org/10.1117/12.2232776
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