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IR STIG Seminar

Infrared Science and Technology Integration Group

DATE

Nov 02, 2021

TIME

1:00 pm EST

COMMUNITY

IR STIG

TYPE

Seminar

NRC Q-band/Band-5 receiver development for the ngVLA

Dr. Sara Salem Hesari (Herzberg Institute of Astrophysics/National Research Council of Canada)

The Radio Instrumentation Team (RIT) at NRC Herzberg in Victoria, Canada, is currently developing a dual linear polarization, single-feed Q-band cryogenic radio astronomy receiver in order to develop and demonstrate all of the important technologies needed for the front-end development for the next generation Very Large Array (ngVLA) project lead by NRAO. The specific target is the ngVLA Band-5 receiver, which covers the frequency range of 30.5 to 50.5 GHz.

The specification of the Q-band receiver is aligned with ngVLA Band 5 requirements. This receiver is designed to achieve a receiver noise temperature of less than 20K in 70% of the bandwidth and better than 25K in the rest of the operating bandwidth, aligned with the ngVLA band-5 receiver requirement. The receiver system consists of a cryostat with a cooled feed horn, a turnstile OMT plus two noise couplers for calibration, two cryogenic low noise amplifiers with noise temperature lower than 14K, IR filters, and a vacuum window to create a low-loss transmission of electromagnetic fields into the cryostat.

Short Bio: Dr. Salem Hesari received her PhD from The University of Victoria and is now a Research Scientist at the NRC Herzberg Astronomy and Astrophysics Research Centre. Her work in radio astronomy is centered around providing astronomers with powerful new tools to explore our Universe.

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