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Proceedings Paper

Strategies on solar observation of Atacama Large Millimeter/submillimeter Array (ALMA) band-1 receiver
Author(s): Chau-Ching Chiong; Po-Han Chiang; Yuh-Jing Hwang; Yau-De Huang
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Paper 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.

Paper Details

Date Published: 19 July 2016
PDF: 8 pages
Proc. SPIE 9914, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII, 991421 (19 July 2016); doi: 10.1117/12.2232254
Show Author Affiliations
Chau-Ching Chiong, Institute of Astronomy and Astrophysics - Academia Sinica (Taiwan)
Po-Han Chiang, Institute of Astronomy and Astrophysics - Academia Sinica (Taiwan)
Yuh-Jing Hwang, Institute of Astronomy and Astrophysics - Academia Sinica (Taiwan)
Yau-De Huang, Institute of Astronomy and Astrophysics - Academia Sinica (Taiwan)


Published in SPIE Proceedings Vol. 9914:
Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII
Wayne S. Holland; Jonas Zmuidzinas, Editor(s)

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