19 July 2016 Strategies on solar observation of Atacama Large Millimeter/submillimeter Array (ALMA) band-1 receiver
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Abstract
ALMA covering 35-950 GHz is the largest existing telescope array in the world. Among the 10 receiver bands, Band-1, which covers 35-50 GHz, is the lowest. Due to its small dimension and its time-variant frequency-dependent gain characteristics, current solar filter located above the cryostat cannot be applied to Band-1 for solar observation. Here we thus adopt new strategies to fulfill the goals. Thanks to the flexible dc biasing scheme of the HEMT-based amplifier in Band-1 front-end, bias adjustment of the cryogenic low noise amplifier is investigated to accomplish solar observation without using solar filter. Large power handling range can be achieved by the de-tuning bias technique with little degradation in system performance.
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Chau-Ching Chiong, Po-Han Chiang, Yuh-Jing Hwang, Yau-De Huang, "Strategies on solar observation of Atacama Large Millimeter/submillimeter Array (ALMA) band-1 receiver", Proc. SPIE 9914, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII, 991421 (19 July 2016); doi: 10.1117/12.2232254; https://doi.org/10.1117/12.2232254
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