Author: Tami Blackwell

The barrel will hold the lenses and optics for DESI, which will map one-third of the night sky. To create an accurate map, the barrel’s pieces must be accurately assembled to within 20 micrometers. Dial Machine of Rockford, Illinois, manufactured

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This Fermilab team is currently assembling the barrel for the Dark Energy Spectroscopic Instrument, a project being led by Lawrence Berkeley National Laboratory. From left: Jorge Montes, Mike Roman, David Butler, Gaston Gutierrez, Giuseppe Gallo, Otto Alvarez. Photo: Reidar Hahn

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Recent photo of ADC2

The photo show the finished lens, undergoing verification testing of the surface roughness specification

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“Philippe Godefroy (CEO of Winlight systems) inspecting the glass blanks for the DESI production spectrograph cameras. All of the blanks in both racks are for the DESI cameras.”

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The ten, final DESI Spectrograph Blue channel diffraction gratings have been successfully verified for optical quality. The diffracted wavefront transmitted across the full 14 cm aperture of one grating is shown in these data. The data were taken at the

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Corrector barrel in Coordinate Measuring Machine (CMM) room at Fermilab for gravity deflection measurements

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The first, fully integrated DESI Spectrograph (known as the Engineering Model) is shown residing on it’s optical bench undergoing performance tuning and testing. The testing is being performed by the DESI Collaboration at Winlight SA, Pertuis, France. A light source

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Fiber Photometry Camera Image 4765, showing light from target stars emerging from three fibers while guiding the telescope using the DESI GFA

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Image of the M2 globular cluster taken by the ProtoDESI guide sensor (GFA) through the Mayall telescope

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Finished Control Room Annex on Mayall U-floor

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