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Proceedings Paper

The Greenland Telescope (GLT): antenna status and future plans
Author(s): Philippe Raffin; Juan Carlos Algaba-Marcosa; Keiichi Asada; Raymond Blundell; Roberto Burgos; Chih-Cheng Chang; Ming-Tang Chen; Robert Christensen; Paul K. Grimes; C. C. Han; Paul T. P. Ho; Yau-De Huang; Makoto Inoue; Patrick M. Koch; Derek Kubo; Steve Leiker; Ching-Tang Liu; Pierre Martin-Cocher; Satoki Matsushita; Masanori Nakamura; Hiroaki Nishioka; George Nystrom; Scott N. Paine; Nimesh A. Patel; Nicolas Pradel; Hung-Yi Pu; H.-Y. Shen; William Snow; Tirupati K. Sridharan; Ranjani Srinivasan; Edward Tong; Jackie Wang
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Paper Abstract

The ALMA North America Prototype Antenna was awarded to the Smithsonian Astrophysical Observatory (SAO) in 2011. SAO and the Academia Sinica Institute of Astronomy and Astrophysics (ASIAA), SAO’s main partner for this project, are working jointly to relocate the antenna to Greenland to carry out millimeter and submillimeter VLBI observations. This paper presents the work carried out on upgrading the antenna to enable operation in the Arctic climate by the GLT Team to make this challenging project possible, with an emphasis on the unexpected telescope components that had to be either redesigned or changed. Five-years of inactivity, with the antenna laying idle in the desert of New Mexico, coupled with the extreme weather conditions of the selected site in Greenland have it necessary to significantly refurbish the antenna. We found that many components did need to be replaced, such as the antenna support cone, the azimuth bearing, the carbon fiber quadrupod, the hexapod, the HVAC, the tiltmeters, the antenna electronic enclosures housing servo and other drive components, and the cables. We selected Vertex, the original antenna manufacturer, for the main design work, which is in progress. The next coming months will see the major antenna components and subsystems shipped to a site of the US East Coast for test-fitting the major antenna components, which have been retrofitted. The following step will be to ship the components to Greenland to carry out VLBI

Paper Details

Date Published: 22 July 2014
PDF: 10 pages
Proc. SPIE 9145, Ground-based and Airborne Telescopes V, 91450G (22 July 2014); doi: 10.1117/12.2056836
Show Author Affiliations
Philippe Raffin, Institute of Astronomy and Astrophysics, Academia Sinica (Taiwan)
Juan Carlos Algaba-Marcosa, Institute of Astronomy and Astrophysics, Academia Sinica (Taiwan)
Keiichi Asada, Institute of Astronomy and Astrophysics, Academia Sinica (Taiwan)
Raymond Blundell, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Roberto Burgos, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Chih-Cheng Chang, Institute of Astronomy and Astrophysics, Academia Sinica (Taiwan)
Ming-Tang Chen, Institute of Astronomy and Astrophysics, Academia Sinica (Taiwan)
Robert Christensen, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Paul K. Grimes, Harvard-Smithsonian Ctr. for Astrophysics (United States)
C. C. Han, Institute of Astronomy and Astrophysics, Academia Sinica (Taiwan)
Paul T. P. Ho, Institute of Astronomy and Astrophysics, Academia Sinica (Taiwan)
arvard-Smithsonian Ctr. for Astrophysics (United States)
Yau-De Huang, Institute of Astronomy and Astrophysics, Academia Sinica (Taiwan)
Makoto Inoue, Institute of Astronomy and Astrophysics, Academia Sinica (Taiwan)
Patrick M. Koch, Institute of Astronomy and Astrophysics, Academia Sinica (Taiwan)
Derek Kubo, Institute of Astronomy and Astrophysics, Academia Sinica (United States)
Steve Leiker, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Ching-Tang Liu, ASRD/CSIST (Taiwan)
Pierre Martin-Cocher, Institute of Astronomy and Astrophysics, Academia Sinica (Taiwan)
Satoki Matsushita, Institute of Astronomy and Astrophysics, Academia Sinica (Taiwan)
Masanori Nakamura, Institute of Astronomy and Astrophysics, Academia Sinica (Taiwan)
Hiroaki Nishioka, Institute of Astronomy and Astrophysics, Academia Sinica (Taiwan)
George Nystrom, Institute of Astronomy and Astrophysics, Academia Sinica (Taiwan)
Scott N. Paine, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Nimesh A. Patel, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Nicolas Pradel, Institute of Astronomy and Astrophysics, Academia Sinica (Taiwan)
Hung-Yi Pu, Institute of Astronomy and Astrophysics, Academia Sinica (Taiwan)
H.-Y. Shen, Institute of Astronomy and Astrophysics, Academia Sinica (Taiwan)
William Snow, Institute of Astronomy and Astrophysics, Academia Sinica (United States)
Tirupati K. Sridharan, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Ranjani Srinivasan, Institute of Astronomy and Astrophysics, Academia Sinica (United States)
Edward Tong, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Jackie Wang, Academia Sinica (Taiwan)


Published in SPIE Proceedings Vol. 9145:
Ground-based and Airborne Telescopes V
Larry M. Stepp; Roberto Gilmozzi; Helen J. Hall, Editor(s)

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