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


Finished Control Room Annex on Mayall U-floor


Production Blue Grating from Kaiser Optical



3-D Galaxy-mapping Project Enters Construction Phase – (CD-3)

This latest DOE approval step, known as Critical Decision 3, triggers spending for major components of the project, including the remainder of the 5,000 finger-width, 10-inch-long cylindrical robots that will precisely point the fiber-optic cables to gather the light from a chosen set of galaxies, stars, and brilliant objects called quasars. (Berkeley Lab News Center, August 9, 2016)

DOE approves Critical Decision 2 for DESI

Paul-Preuss-DESI-Mayall-sky-300x300The U.S. Department of Energy has announced its approval of Critical Decision 2 (CD–2), authorizing the project’s scientific scope, schedule, and funding profile. (Berkeley Lab News Center, September 21, 2015)

Largest Corrector Lens C1

c1To the left is a photograph of our largest corrector lens, C1, measuring 1.15m in diameter.  The homogeneity of the fused silca glass came in at an astounding 1ppm (exceeding our 3ppm spec.).  C1 and C4 are about to be packed up and shipped from Corning to L3-Brashear.  L3-Brashear was recently selected to polish C1 and C4.  Arizona Optical Sciences is already at work polishing C2 and C3.  We expect all four of these lenses to be completed through polishing by the end of 2015.


C2 and C3 glass blanks finished


Ohara Corp in Japan has informed us that they have finished manufacturing the C2 and C3 blanks and are finalizing them for shipment.  Arizona Optical Systems (AOS) has been awarded the glass polishing contract for these two lenses and their preparations to receive the blanks are already underway.  The first task will be to grind the two lenses to near net shape before they start the polishing process.
The image to the left is the C2 blank.  This lens blank is 852mm diameter x 191mm thick.

DESI awarded $1.1M from the Heising-Simons Foundation

We are pleased to announce that the Heising-Simons foundation has awarded $1.15M to the DESI Project.  The purpose of the award will be to fabricate the long-lead optics of the corrector (C1 and C4).  We expect to receive the funds shortly. (Today At Berkeley Lab, October 20, 2014)

DESI’s Concept and Budget Range Approved

DESI-150x150 9-11 September 2014:  “Last week, the Dark Energy Spectroscopic Instrument project, DESI, passed a critical early review known as CD-1.  For the review, the Department of Energy’s Office of Project Assessment brought in a panel of 14 experts to review the conceptual design, preliminary timelines, and a budget range. The next step, CD-2, will be to establish a cost baseline and approve the preliminary design…” (Today At Berkeley Lab, September 15, 2014)


Natalie Roe Testifies Before Congress on Particle Physics’ Future

RoeTestimonyScreenshot110 June 2014:  “On June 10th in Washington D.C. Natalie Roe, Director of the Physics Division at Berkeley Lab, testified at a congressional subcommittee hearing on the future of particle physics, prompted by the recent release of the Particle Physics Project Prioritization report…She also spoke of the mystery of dark energy—an unexplained force that appears to be accelerating the expansion of the universe—and outlined an exciting new effort called the Dark Energy Spectroscopic Instrument, or DESI…” (Berkeley Lab News Center, June 20, 2014)


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