Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Mirror Casting Event for the Giant Magellan Telescope

10.01.2012
On Jan. 14, the second 8.4-meter (27.6 ft) diameter mirror for the Giant Magellan Telescope, or GMT, will be cast inside a rotating furnace at the University of Arizona's Steward Observatory Mirror Lab underneath the campus football stadium. The mirror lab will host a special event to highlight this milestone in the creation of the optics for the Giant Magellan Telescope.

Members of the media are invited to visit the mirror lab on Jan. 14 between 9-11 a.m. MST to see the liquid glass as it is spun cast in a rotating oven at a temperature of 1170 degrees C (2140 F). This casting marks another major step in the construction of the Giant Magellan Telescope. There will be opportunities to interview leading scientists and engineers involved in the project.

The GMT features an innovative design utilizing seven mirrors, each 8.4 meters in diameter, arranged as segments of a single mirror 24.5 meters

(80 feet) in diameter, to bring starlight to a common focus via a set of adaptive secondary mirrors configured in a similar seven-fold pattern.

"In this design the outer six mirrors are off-axis paraboloids and represent the greatest optics challenge ever undertaken in astronomical optics by a large factor," said Roger Angel, director of the Steward Observatory Mirror Lab, or SOML.

The GMT will allow astronomers to answer some of the most pressing questions about the cosmos including the detection, imaging and characterization of planets orbiting other stars, the nature of dark matter and dark energy, the physics of black holes, and how stars and galaxies evolved during the earliest phases of the universe.

"The GMT will allow astronomers to observe for the first time the first stars formed after the Big Bang," said Steve Finkelstein, Hubble Fellow at The University of Texas at Austin. "I cannot wait to make these observations."

"Astronomical discovery has always been paced by the power of available telescopes and imaging technology," said Peter Strittmatter, director of Steward Observatory. "The GMT allows another major step forward in both sensitivity and image sharpness. In fact the GMT will be able to acquire images 10 times sharper than the Hubble Space Telescope and will provide a powerful complement not only to NASA's 6.5-meter James Webb Space Telescope, or JWST, but also to the Atacama Large Millimeter Array, or ALMA, and the Large Synoptic Survey Telescope, or LSST, both located in the southern hemisphere."

Patrick McCarthy, GMT project director, added, "This second GMT casting is going forward now because the primary optics are on the critical path for the project, and because the polishing of the first off-axis 8.4-meter GMT mirror is very close to completion, with an optical surface accuracy within about 25 nanometers, or about one-thousandth the thickness of a human hair."

Like other mirrors produced by the SOML, the GMT mirrors are designed to be spun cast, thereby achieving the basic front surface in the shape of a paraboloid. A paraboloid is the shape taken on by water in a bucket when the bucket is spun around its axis; the water rises up the walls of the bucket while a depression forms in the center.

Some 21 tons of borosilicate glass, made by the Ohara Corporation, flow into a pre-assembled mold to create a lightweight honeycomb glass structure that is very stiff and quickly adjusts to changes in nighttime air temperature, each resulting in sharper images. The mirror lab has already produced the world's four largest astronomical mirrors, each 8.4 meters in diameter. Two are in operation in the Large Binocular Telescope, or LBT - currently the largest telescope in the world; one is for the LSST, and the fourth is the first off-axis mirror for GMT. The UA's Mirror Lab has also produced five 6.5-meter mirrors, two of which are in the twin Magellan telescopes at Las Campanas Observatory in Chile.

"The novel technology developed at the mirror lab is creating a whole new generation of large telescopes with unsurpassed image sharpness and light collecting power," said Wendy Freedman, director of the Carnegie Observatories and chair of the GMTO Board. "The SOML mirrors in the twin Magellan Telescopes at our Las Campanas Observatory site are performing superbly and led to our adoption of this technology for the GMT."

The GMT is set to begin science operations in 2020 at the Las Campanas Observatory, exploiting the clear dark skies of the Atacama Desert in northern Chile.

"With funding commitments in hand for close to half of the $700 million required to complete the project, with one mirror essentially finished and the second about to be cast, and with the planned groundbreaking at Las Campanas in February of this year, the project is on track to meet this schedule goal," said Matthew Colless, Director of the Australian Astronomical Observatory.

"The giant mirrors being spun cast for the GMT at the Steward Observatory Mirror Lab are like the sails of the great ships of exploration ca. 1500, except here the discoveries are not lands across the ocean, but rather the nature of whole new worlds and island universes, spanning all of space and time," said Joaquin Ruiz, dean of the College of Science, University of Arizona. "We are proud to participate in such an exciting international scientific project as the GMT."

The event is supported by the University of Arizona's Steward Observatory and College of Science and by the GMTO Corp., a nonprofit entity with project offices based in Pasadena, Calif. The GMTO manages the GMT Project on behalf of its international partners, namely Astronomy Australia Ltd., the Australian National University, the Carnegie Institution for Science, Harvard University, the Korea Astronomy and Space Science Institute, the Smithsonian Institution, Texas A&M University, the University of Arizona, the University of Chicago and the University of Texas at Austin.

CONTACTS:

Roger Angel, director, SOML (rangel@as.arizona.edu; 520-621-6541)

Patrick McCarthy, director, GMTO (pmccarthy@gmto.org; 626-304-0222)

Wendy Freedman, chair, Board of Directors, GMTO
(wendy@obs.carnegiescience.edu; 626-304-0204)
Peter Strittmatter, director, Steward Observatory (pstrittmatter@email.arizona.edu; 520-621-6524)

Peter Wehinger, staff astronomer and director of development, Steward Observatory (wehinger@email.arizona.edu; 520-621-7662)

Cathi Duncan, coordinator (cduncan@as.arizona.edu; 520-626-8792)

LINKS:

For more information about the GMT, see www.gmto.org.

For images, see http://www.gmto.org/forpress.html.

The University of Arizona Steward Observatory Mirror Lab:
http://mirrorlab.as.arizona.edu

Daniel Stolte | University of Arizona
Further information:
http://www.arizona.edu

More articles from Physics and Astronomy:

nachricht Quantum optics allows us to abandon expensive lasers in spectroscopy
22.11.2017 | Lomonosov Moscow State University

nachricht Nano-watch has steady hands
22.11.2017 | University of Vienna

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Nanoparticles help with malaria diagnosis – new rapid test in development

The WHO reports an estimated 429,000 malaria deaths each year. The disease mostly affects tropical and subtropical regions and in particular the African continent. The Fraunhofer Institute for Silicate Research ISC teamed up with the Fraunhofer Institute for Molecular Biology and Applied Ecology IME and the Institute of Tropical Medicine at the University of Tübingen for a new test method to detect malaria parasites in blood. The idea of the research project “NanoFRET” is to develop a highly sensitive and reliable rapid diagnostic test so that patient treatment can begin as early as possible.

Malaria is caused by parasites transmitted by mosquito bite. The most dangerous form of malaria is malaria tropica. Left untreated, it is fatal in most cases....

Im Focus: A “cosmic snake” reveals the structure of remote galaxies

The formation of stars in distant galaxies is still largely unexplored. For the first time, astron-omers at the University of Geneva have now been able to closely observe a star system six billion light-years away. In doing so, they are confirming earlier simulations made by the University of Zurich. One special effect is made possible by the multiple reflections of images that run through the cosmos like a snake.

Today, astronomers have a pretty accurate idea of how stars were formed in the recent cosmic past. But do these laws also apply to older galaxies? For around a...

Im Focus: Visual intelligence is not the same as IQ

Just because someone is smart and well-motivated doesn't mean he or she can learn the visual skills needed to excel at tasks like matching fingerprints, interpreting medical X-rays, keeping track of aircraft on radar displays or forensic face matching.

That is the implication of a new study which shows for the first time that there is a broad range of differences in people's visual ability and that these...

Im Focus: Novel Nano-CT device creates high-resolution 3D-X-rays of tiny velvet worm legs

Computer Tomography (CT) is a standard procedure in hospitals, but so far, the technology has not been suitable for imaging extremely small objects. In PNAS, a team from the Technical University of Munich (TUM) describes a Nano-CT device that creates three-dimensional x-ray images at resolutions up to 100 nanometers. The first test application: Together with colleagues from the University of Kassel and Helmholtz-Zentrum Geesthacht the researchers analyzed the locomotory system of a velvet worm.

During a CT analysis, the object under investigation is x-rayed and a detector measures the respective amount of radiation absorbed from various angles....

Im Focus: Researchers Develop Data Bus for Quantum Computer

The quantum world is fragile; error correction codes are needed to protect the information stored in a quantum object from the deteriorating effects of noise. Quantum physicists in Innsbruck have developed a protocol to pass quantum information between differently encoded building blocks of a future quantum computer, such as processors and memories. Scientists may use this protocol in the future to build a data bus for quantum computers. The researchers have published their work in the journal Nature Communications.

Future quantum computers will be able to solve problems where conventional computers fail today. We are still far away from any large-scale implementation,...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Ecology Across Borders: International conference brings together 1,500 ecologists

15.11.2017 | Event News

Road into laboratory: Users discuss biaxial fatigue-testing for car and truck wheel

15.11.2017 | Event News

#Berlin5GWeek: The right network for Industry 4.0

30.10.2017 | Event News

 
Latest News

Corporate coworking as a driver of innovation

22.11.2017 | Business and Finance

PPPL scientists deliver new high-resolution diagnostic to national laser facility

22.11.2017 | Physics and Astronomy

Quantum optics allows us to abandon expensive lasers in spectroscopy

22.11.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>