DESI Archives - Page 2 of 3

Now complete, telescope instrument is poised to begin its search for answers about dark energy

The Dark Energy Spectroscopic Instrument, which will map millions of galaxies in 3-D, reaches final milestone toward its startup.

How to build a 3-D map of the universe – and why

From DOE, Nov. 20, 2019: Fermilab scientist Antonella Palmese is quoted in this article on scientists’ efforts to get to the bottom of the nature of dark energy. These efforts include the Dark Energy Survey, hosted by Fermilab, and the Dark Energy Spectroscopic Instrument, on which Fermilab scientists are collaborators.

DESI opens its 5,000 eyes to capture the colors of the cosmos

Berkeley Lab’s Dark Energy Spectroscopic Instrument aimed its robotic array of 5,000 fiber-optic “eyes” at the night sky Oct. 22 to capture the first images showing its unique view of galaxy light. It was the first test DESI with its nearly complete complement of components. Fermilab contributed key elements to DESI, including the corrector barrel, hexapod, cage and CCDs. Fermilab also provided the online databases used for data acquisition and the software for the instrument’s robotic positioners.

Three sky surveys completed in preparation for Dark Energy Spectroscopic Instrument

It took three sky surveys to prepare for a new project that will create the largest 3-D map of the universe’s galaxies and glean new insights about the universe’s accelerating expansion. This Dark Energy Spectroscopic Instrument project will explore this expansion, driven by a mysterious property known as dark energy, in great detail. The surveys, which wrapped up in March, have amassed images of more than 1 billion galaxies and are essential in selecting celestial objects to target with DESI, now under construction in Arizona.

Dark energy instrument’s lenses see the night sky for the first time

The optical lenses for the Dark Energy Spectroscopic Instrument have seen their first light. Fermilab contributed key components to DESI, including the corrector barrel and its support structures, along with vital software that ensures the instrument’s 5,000 robotic positioners are precisely aligned with their celestial targets.

Topping off a telescope with new tools to explore dark energy

From Berkeley Lab, Dec. 4, 2018: Key components of Berkeley Lab’s Dark Energy Spectroscopic Instrument are installed after months of planning, prep work. A team at Fermilab built the corrector, hexapod, and other top-end support structures. The structures are designed to align the lenses with an accuracy of tens of microns (millionths of a meter) – similar to the width of the thinnest human hair.