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Proceedings Paper

Electronics instrumentation for the Greenland Telescope
Author(s): Derek Kubo; Chih-Chiang Han; Hiroaki Nishioka; Ryan Chilson; Ranjani Srinivasan; Sheng-Feng Yen; Kuo-Chieh Fu; Homin Jiang; Kuan-Yu Liu; Ta-Shun Wei; Chih-Wei Huang; Chen-Yu Yu; Peter Oshiro; Shu-Hao Chang; Chung-Cheng Chen; Philippe Raffin; Yau-De Huang; Pierre Martin-Cocher; Ming-Tang Chen; Makoto Inoue; Satoki Matsushita; Keiichi Asada; Shoko Koyama; Patrick Koch; Paul T. P. Ho; Yang-Tai Shaw; Timothy J. Norton; Nimesh A. Patel; Shepherd S. Doeleman; Daniel Bintley; Craig Walther; Per Friberg; Jessica Dempsey; Hideo Ogawa; Kimihiro Kimura; Yutaka Hasegawa; Ching-Tang Liu; Kou-Chang Han; Song-Chu Chang; Li-Ming Lu
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Paper Abstract

The Greenland Telescope project has recently participated in an experiment to image the supermassive black hole shadow at the center of M87 using Very Long Baseline Interferometry technique in April of 2018. The antenna consists of the 12-m ALMA North American prototype antenna that was modified to support two auxiliary side containers and to withstand an extremely cold environment. The telescope is currently at Thule Air Base in Greenland with the long-term goal to move the telescope over the Greenland ice sheet to Summit Station. The GLT currently has a single cryostat which houses three dual polarization receivers that cover 84-96 GHz, 213-243 GHz and 271-377 GHz bands. A hydrogen maser frequency source in conjunction with high frequency synthesizers are used to generate the local oscillator references for the receivers. The intermediate frequency outputs of each receiver cover 4-8 GHz and are heterodyned to baseband for digitization within a set of ROACH-2 units then formatted for recording onto Mark-6 data recorders. A separate set of ROACH-2 units operating in parallel provides the function of auto-correlation for real-time spectral analysis. Due to the stringent instrumental stability requirements for interferometry a diagnostic test system was incorporated into the design. Tying all of the above equipment together is the fiber optic system designed to operate in a low temperature environment and scalable to accommodate a larger distance between the control module and telescope for Summit Station. A report on the progress of the above electronics instrumentation system will be provided.

Paper Details

Date Published: 9 July 2018
PDF: 19 pages
Proc. SPIE 10708, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX, 1070816 (9 July 2018); doi: 10.1117/12.2312241
Show Author Affiliations
Derek Kubo, Institute of Astronomy and Astrophysics (Taiwan)
Chih-Chiang Han, Institute of Astronomy and Astrophysics (Taiwan)
Hiroaki Nishioka, Institute of Astronomy and Astrophysics (Taiwan)
Ryan Chilson, Institute of Astronomy and Astrophysics (Taiwan)
Ranjani Srinivasan, Institute of Astronomy and Astrophysics (Taiwan)
Sheng-Feng Yen, Institute of Astronomy and Astrophysics (Taiwan)
Kuo-Chieh Fu, Institute of Astronomy and Astrophysics (Taiwan)
Homin Jiang, Institute of Astronomy and Astrophysics (Taiwan)
Kuan-Yu Liu, Institute of Astronomy and Astrophysics (Taiwan)
Ta-Shun Wei, Institute of Astronomy and Astrophysics (Taiwan)
Chih-Wei Huang, Institute of Astronomy and Astrophysics (Taiwan)
Chen-Yu Yu, Institute of Astronomy and Astrophysics (Taiwan)
Peter Oshiro, Institute of Astronomy and Astrophysics (Taiwan)
Shu-Hao Chang, Institute of Astronomy and Astrophysics (Taiwan)
Chung-Cheng Chen, Institute of Astronomy and Astrophysics (Taiwan)
Philippe Raffin, Institute of Astronomy and Astrophysics (Taiwan)
Yau-De Huang, Institute of Astronomy and Astrophysics (Taiwan)
Pierre Martin-Cocher, Institute of Astronomy and Astrophysics (Taiwan)
Ming-Tang Chen, Institute of Astronomy and Astrophysics (Taiwan)
Makoto Inoue, Institute of Astronomy and Astrophysics (Taiwan)
Satoki Matsushita, Institute of Astronomy and Astrophysics (Taiwan)
Keiichi Asada, Institute of Astronomy and Astrophysics (Taiwan)
Shoko Koyama, Institute of Astronomy and Astrophysics (Taiwan)
Patrick Koch, Institute of Astronomy and Astrophysics (Taiwan)
Paul T. P. Ho, Institute of Astronomy and Astrophysics (Taiwan)
Yang-Tai Shaw, Institute of Astronomy and Astrophysics (Taiwan)
Timothy J. Norton, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Nimesh A. Patel, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Shepherd S. Doeleman, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Daniel Bintley, East Asian Observatory (United States)
Craig Walther, East Asian Observatory (United States)
Per Friberg, East Asian Observatory (United States)
Jessica Dempsey, East Asian Observatory (United States)
Hideo Ogawa, Osaka Prefecture Univ. (Japan)
Kimihiro Kimura, Osaka Prefecture Univ. (Japan)
Yutaka Hasegawa, Osaka Prefecture Univ. (Japan)
Ching-Tang Liu, National Chung-Shan Institute of Science and Technology (Taiwan)
Kou-Chang Han, National Chung-Shan Institute of Science and Technology (Taiwan)
Song-Chu Chang, National Chung-Shan Institute of Science and Technology (Taiwan)
Li-Ming Lu, National Chung-Shan Institute of Science and Technology (Taiwan)


Published in SPIE Proceedings Vol. 10708:
Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX
Jonas Zmuidzinas; Jian-Rong Gao, Editor(s)

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