Electronics instrumentation for the Greenland Telescope

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

doi:10.1117/12.2312241

9 July 2018 Electronics instrumentation for the Greenland Telescope

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

Author Affiliations +

Proceedings Volume 10708, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX; 1070816 (2018) https://doi.org/10.1117/12.2312241
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

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.

Conference Presentation

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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, and Li-Ming Lu "Electronics instrumentation for the Greenland Telescope", Proc. SPIE 10708, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX, 1070816 (9 July 2018); https://doi.org/10.1117/12.2312241

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