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GMT’s First Giant Mirror Segment Starts Journey South

The first of seven 27-foot mirrors that together assemble into the world’s largest telescope, the Giant Magellan Telescope, has left the Richard F. Caris Mirror Lab at the University of Arizona, making space for the production of the remaining mirror segments.

At 2:00 a.m. on Sept. 20 the hangar-like doors of the Mirror Lab, located underneath the University’s football stadium, slid open to reveal a custom-made precision shipping container, with the mirror tucked inside, ready to be moved to a temporary storage facility on the outskirts of Tucson AZ, as the first step on its journey towards its ultimate destination in the Chilean Andes.

Once completed, the seven mirror segments will form the heart of the Giant Magellan Telescope, designed to have a resolving power 10 times greater than that of the Hubble Space Telescope.

The Mirror Lab currently houses GMT primary mirror segment numbers 2, 3, and 4 which are in various stages of fabrication. Segment 2 is undergoing its final stage of work – polishing of its reflective surface – while segment 3 is ready for front surface grinding, and segment 4 is ready for rear surface grinding. The 17-ton glass disc for the fifth GMT primary mirror segment will be cast at the Mirror Lab on November 5, 2017.

In the weeks preceding the move, the mirror had been lifted into a transport container inside the Mirror Lab. The mirror was lifted with suction cups attached to its precisely polished front surface. The transport container is a highly sophisticated unit, containing shock absorbers, load-equalizing levers, and heavy insulation capable of keeping the mirror safe until it is delivered to the mountain top site in Chile. The transport container, weighing twice as much as the mirror itself, was fabricated by CAID Industries of Tucson, Az. With the mirror inside, the unit weighs 55 tons.

Safely ensconced in its transport container, the mirror was carefully loaded onto the deck of a 48-wheel transporter. The move by road was undertaken by Precision Heavy Haul Inc. of Phoenix AZ, taking an hour to cover the roughly 8 miles to the storage facility.

GMT segment 1 will remain in storage until it is shipped, by road and sea, to the GMT site at the Carnegie Institution for Science’s Las Campanas Observatory in Chile – one of the world’s premier astronomical sites.

Construction is underway at the GMT site; work on essential infrastructure – roads, power, water, sanitation, communications, and a worker’s residence – is complete. Excavation of the foundations for the telescope and the laboratory where the mirrors will be matched to the telescope is scheduled to begin early next year.

The telescope is expected to see first light in 2023 with four of the Arizona mirrors. The seventh mirror should be in the telescope in 2025.

Quotes:

“Starting the first mirror on its long road to the mountain top in Chile marks a major milestone for the project. The GMT is a discovery machine and the precision optics form its uniquely powerful eye on the Universe. When Science, Engineering, and Philanthropy come together, great things are bound to happen.”
Dr. Robert N. Shelton, President, GMTO Corporation

“The University of Arizona is proud to be a partner in the GMT. The GMT’s primary mirror design and fabrication processes, invented by UA scientists and engineers, are at the heart of the telescope. With the first completed segment moved from the Richard F. Caris Mirror Lab, we will have more space to continue the production of the remaining segments.”
Dr. Buell T. Jannuzi, Head of the Department of Astronomy and Director of Steward Observatory, University of Arizona

Multimedia resources:


Video showing the process for preparing GMT Segment 1 from inside the Mirror Lab. Video courtesy Richard F. Caris Mirror Lab, University of Arizona.


GMT Segment 1 being transported through the streets of Tucson AZ, in the early hours of September 20, 2017

Richard F. Caris Mirror Lab Manager Stuart Weinberger inside the transport container for GMT primary mirror segment 1. The blue struts connect the container to the mirror load-spreaders. This secures the mirror to the transport container. Image credit: Damien Jemison/Giant Magellan Telescope – GMTO Corporation.

Richard F. Caris Mirror Lab Manager Stuart Weinberger inside the transport container for GMT primary mirror segment 1. The blue struts connect the container to the mirror load-spreaders. This secures the mirror to the transport container. Image credit: Damien Jemison/Giant Magellan Telescope – GMTO Corporation.

 

GMT Primary mirror segment 1 being vacuum lifted from the polishing table in the background onto the base of the shipping container in the foreground. The surface of the mirror is protected by a thin blue polymer coating that will be removed when the mirror reaches the GMT site. Image credit: Jeffrey S. Kingsley, Richard F. Caris Mirror Lab, The University of Arizona.

GMT Primary mirror segment 1 being vacuum lifted from the polishing table in the background onto the base of the shipping container in the foreground. The surface of the mirror is protected by a thin blue polymer coating that will be removed when the mirror reaches the GMT site. Image credit: Jeffrey S. Kingsley, Richard F. Caris Mirror Lab, The University of Arizona.

 

The storage container lid is being moved over GMT Primary mirror segment 1, already located on the base of the shipping container.  The lid will then be secured to the base. Image credit:  Cathi Duncan, Richard F. Caris Mirror Lab, The University of Arizona.

The storage container lid is being moved over GMT Primary mirror segment 1, already located on the base of the shipping container. The lid will then be secured to the base. Image credit: Cathi Duncan, Richard F. Caris Mirror Lab, The University of Arizona.

 

The GMT Primary mirror segment 1 safely ensconced in the transportation box, with a, combined weight of 55 tons, is then lifted and begins the moved out of the Richard F. Caris Mirror Lab facility onto the awaiting Precision Heavy Haul trailer. Image credit: Cathi Duncan, Richard F. Caris Mirror Lab, The University of Arizona.

The GMT Primary mirror segment 1 safely ensconced in the transportation box, with a, combined weight of 55 tons, is then lifted and begins the moved out of the Richard F. Caris Mirror Lab facility onto the awaiting Precision Heavy Haul trailer. Image credit: Cathi Duncan, Richard F. Caris Mirror Lab, The University of Arizona.

 

The transportation box with the GMT primary mirror segment 1 safely ensconced, with a combined weight of 55 tons, has been moved out of the Richard F. Caris Mirror Lab facility onto the Precision Heavy Haul trailer. Image credit: Cathi Duncan, Richard F. Caris Mirror Lab, The University of Arizona.

The transportation box with the GMT primary mirror segment 1 safely ensconced, with a combined weight of 55 tons, has been moved out of the Richard F. Caris Mirror Lab facility onto the Precision Heavy Haul trailer. Image credit: Cathi Duncan, Richard F. Caris Mirror Lab, The University of Arizona.

 

The transporter, with GMT primary mirror segment 1 on board, on its way to the storage location. Image credit: Damien Jemison/Giant Magellan Telescope – GMTO Corporation.

The transporter, with GMT primary mirror segment 1 on board, on its way to the storage location. Image credit: Damien Jemison/Giant Magellan Telescope – GMTO Corporation.

 

The transporter, with GMT primary mirror segment 1 on board, backs into its storage location near Tucson International Airport. Image credit: Damien Jemison/Giant Magellan Telescope – GMTO Corporation

The transporter, with GMT primary mirror segment 1 on board, backs into its storage location near Tucson International Airport. Image credit: Damien Jemison/Giant Magellan Telescope – GMTO Corporation