The Greenland Telescope (GLT): Antenna status and future plans

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

doi:10.1117/12.2056836

The Greenland Telescope (GLT): Antenna status and future plans

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

^*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

11 Citations (Scopus)

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 and single dish observations. Antenna reassembly at Summit Station should take place during the summer of 2018.

Original language	English
Title of host publication	Ground-Based and Airborne Telescopes V
Editors	Helen J. Hall, Larry M. Stepp, Roberto Gilmozzi
Publisher	SPIE
ISBN (Electronic)	9780819496133
DOIs	https://doi.org/10.1117/12.2056836
Publication status	Published - 2014
Externally published	Yes
Event	Ground-Based and Airborne Telescopes V - Montreal, Canada Duration: 2014 Jun 22 → 2014 Jun 27

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	9145
ISSN (Print)	0277-786X
ISSN (Electronic)	1996-756X

Conference

Conference	Ground-Based and Airborne Telescopes V
Country/Territory	Canada
City	Montreal
Period	2014/06/22 → 2014/06/27

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 13 Climate Action

Keywords

Greenland
VLBI
antenna retrofit
carbon fiber

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Computer Science Applications
Applied Mathematics
Electrical and Electronic Engineering

Access to Document

10.1117/12.2056836

Cite this

Raffin, P., Algaba-Marcosa, J. C., Asada, K., Blundell, R., Burgos, R., Chang, C. C., Chen, M. T., Christensen, R., Grimes, P. K., Han, C. C., Ho, P. T. P., Huang, Y. D., Inoue, M., Koch, P. M., Kubo, D., Leiker, S., Liu, C. T., Martin-Cocher, P., Matsushita, S., ... Wang, J. (2014). The Greenland Telescope (GLT): Antenna status and future plans. In H. J. Hall, L. M. Stepp, & R. Gilmozzi (Eds.), Ground-Based and Airborne Telescopes V Article 91450G (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 9145). SPIE. https://doi.org/10.1117/12.2056836

The Greenland Telescope (GLT): Antenna status and future plans. / Raffin, Philippe; Algaba-Marcosa, Juan Carlos; Asada, Keiichi et al.
Ground-Based and Airborne Telescopes V. ed. / Helen J. Hall; Larry M. Stepp; Roberto Gilmozzi. SPIE, 2014. 91450G (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 9145).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Raffin, P, Algaba-Marcosa, JC, Asada, K, Blundell, R, Burgos, R, Chang, CC, Chen, MT, Christensen, R, Grimes, PK, Han, CC, Ho, PTP, Huang, YD, Inoue, M, Koch, PM, Kubo, D, Leiker, S, Liu, CT, Martin-Cocher, P, Matsushita, S, Nakamura, M, Nishioka, H, Nystrom, G, Paine, SN, Patel, NA, Pradel, N, Pu, HY, Shen, HY, Snow, W, Sridharan, TK, Srinivasan, R, Tong, E & Wang, J 2014, The Greenland Telescope (GLT): Antenna status and future plans. in HJ Hall, LM Stepp & R Gilmozzi (eds), Ground-Based and Airborne Telescopes V., 91450G, Proceedings of SPIE - The International Society for Optical Engineering, vol. 9145, SPIE, Ground-Based and Airborne Telescopes V, Montreal, Canada, 2014/06/22. https://doi.org/10.1117/12.2056836

@inproceedings{40b6737667ff44d19d891dfc4eb69562,

title = "The Greenland Telescope (GLT): Antenna status and future plans",

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 and single dish observations. Antenna reassembly at Summit Station should take place during the summer of 2018.",

keywords = "Greenland, VLBI, antenna retrofit, carbon fiber",

author = "Philippe Raffin and Algaba-Marcosa, \{Juan Carlos\} and Keiichi Asada and Raymond Blundell and Roberto Burgos and Chang, \{Chih Cheng\} and Chen, \{Ming Tang\} and Robert Christensen and Grimes, \{Paul K.\} and Han, \{C. C.\} and Ho, \{Paul T.P.\} and Huang, \{Yau De\} and Makoto Inoue and Koch, \{Patrick M.\} and Derek Kubo and Steve Leiker and Liu, \{Ching Tang\} and Pierre Martin-Cocher and Satoki Matsushita and Masanori Nakamura and Hiroaki Nishioka and George Nystrom and Paine, \{Scott N.\} and Patel, \{Nimesh A.\} and Nicolas Pradel and Pu, \{Hung Yi\} and Shen, \{H. Y.\} and William Snow and Sridharan, \{Tirupati K.\} and Ranjani Srinivasan and Edward Tong and Jackie Wang",

note = "Publisher Copyright: {\textcopyright} 2014 SPIE.; Ground-Based and Airborne Telescopes V ; Conference date: 22-06-2014 Through 27-06-2014",

year = "2014",

doi = "10.1117/12.2056836",

language = "English",

series = "Proceedings of SPIE - The International Society for Optical Engineering",

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AU - Raffin, Philippe

AU - Algaba-Marcosa, Juan Carlos

AU - Asada, Keiichi

AU - Blundell, Raymond

AU - Burgos, Roberto

AU - Chang, Chih Cheng

AU - Chen, Ming Tang

AU - Christensen, Robert

AU - Grimes, Paul K.

AU - Han, C. C.

AU - Ho, Paul T.P.

AU - Huang, Yau De

AU - Inoue, Makoto

AU - Koch, Patrick M.

AU - Kubo, Derek

AU - Leiker, Steve

AU - Liu, Ching Tang

AU - Martin-Cocher, Pierre

AU - Matsushita, Satoki

AU - Nakamura, Masanori

AU - Nishioka, Hiroaki

AU - Nystrom, George

AU - Paine, Scott N.

AU - Patel, Nimesh A.

AU - Pradel, Nicolas

AU - Pu, Hung Yi

AU - Shen, H. Y.

AU - Snow, William

AU - Sridharan, Tirupati K.

AU - Srinivasan, Ranjani

AU - Tong, Edward

AU - Wang, Jackie

PY - 2014

Y1 - 2014

N2 - 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 and single dish observations. Antenna reassembly at Summit Station should take place during the summer of 2018.

AB - 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 and single dish observations. Antenna reassembly at Summit Station should take place during the summer of 2018.

KW - Greenland

KW - VLBI

KW - antenna retrofit

KW - carbon fiber

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BT - Ground-Based and Airborne Telescopes V

A2 - Hall, Helen J.

A2 - Stepp, Larry M.

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PB - SPIE

Y2 - 22 June 2014 through 27 June 2014

ER -

The Greenland Telescope (GLT): Antenna status and future plans

Abstract

Publication series

Conference

UN SDGs

Keywords

ASJC Scopus subject areas

Access to Document

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