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    The DOE Science News Source is a Newswise initiative to promote research news from the Office of Science of the DOE to the public and news media.
    • 2020-09-02 10:05:29
    • Article ID: 737356

    Sensors of world’s largest digital camera snap first 3,200-megapixel images at SLAC

    The camera will explore cosmic mysteries as part of the Rubin Observatory's Legacy Survey of Space and Time.

    • Credit: Greg Stewart/SLAC National Accelerator Laboratory

      Crews at SLAC have taken the first 3,200-megapixel images with the complete focal plane of the LSST Camera, the future “eye” of Vera C. Rubin Observatory. They are the largest digital images ever taken in a single shot. One of the first objects photographed was a Romanesco, chosen for its very detailed texture.

    • Credit: Jacqueline Orrell/SLAC National Accelerator Laboratory

      The complete focal plane of the future LSST Camera is more than 2 feet wide and contains 189 individual sensors that will produce 3,200-megapixel images.

    • Credit: Farrin Abbott/SLAC National Accelerator Laboratory

      Individual imaging sensors and supporting electronics of the LSST Camera’s focal plane are packaged into units, called “rafts.” There are two different types of units: 21 square rafts (center), each containing nine sensors, will produce the images for Rubin Observatory’s science program. An additional four specialty rafts (left) with only three sensors will be used for camera focusing and synchronizing the telescope with Earth’s rotation.

    • Credit: Greg Stewart/SLAC National Accelerator Laboratory

      The LSST Camera’s focal plane has a surface area large enough to capture a portion of the sky about the size of 40 full moons. Its resolution is so high that you could spot a golf ball from 15 miles away.

    • Credit: Greg Stewart/Jacqueline Orrell/SLAC National Accelerator Laboratory

      Taking the first 3,200-megapixel images was an important first test for the focal plane. To do so without a fully assembled camera, the SLAC team used a 150-micron pinhole to project images onto the focal plane. Left: Schematic of a pinhole projector that projects images of a Romanesco’s detailed texture onto the focal plane. Right: SLAC's Yousuke Utsumi and Aaron Roodman remove the pinhole projector from the cryostat assembly after projecting the first images onto the focal plane.

    • Credit: Chris Smith/SLAC National Accelerator Laboratory

      Over the next few months, the LSST Camera team will integrate the remaining camera components, including the lenses, a shutter and a filter exchange system. By mid-2021, the SUV-sized camera will be ready for final testing.

    Menlo Park, Calif. — Crews at the Department of Energy’s SLAC National Accelerator Laboratory have taken the first 3,200-megapixel digital photos – the largest ever taken in a single shot – with an extraordinary array of imaging sensors that will become the heart and soul of the future camera of Vera C. Rubin Observatory.  

    The images are so large that it would take 378 4K ultra-high-definition TV screens to display one of them in full size, and their resolution is so high that you could see a golf ball from about 15 miles away. These and other properties will soon drive unprecedented astrophysical research.  

    Next, the sensor array will be integrated into the world’s largest digital camera, currently under construction at SLAC. Once installed at Rubin Observatory in Chile, the camera will produce panoramic images of the complete Southern sky – one panorama every few nights for 10 years. Its data will feed into the Rubin Observatory Legacy Survey of Space and Time (LSST) – a catalog of more galaxies than there are living people on Earth and of the motions of countless astrophysical objects. Using the LSST Camera, the observatory will create the largest astronomical movie of all time and shed light on some of the biggest mysteries of the universe, including dark matter and dark energy. 

    The first images taken with the sensors were a test for the camera’s focal plane, whose assembly was completed at SLAC in January. 

    “This is a huge milestone for us,” said Vincent Riot, LSST Camera project manager from DOE’s Lawrence Livermore National Laboratory. ”The focal plane will produce the images for the LSST, so it’s the capable and sensitive eye of the Rubin Observatory.” 

    SLAC’s Steven Kahn, director of the observatory, said, "This achievement is among the most significant of the entire Rubin Observatory Project. The completion of the LSST Camera focal plane and its successful tests is a huge victory by the camera team that will enable Rubin Observatory to deliver next-generation astronomical science." 

    A technological marvel for the best science 

    In a way, the focal plane is similar to the imaging sensor of a digital consumer camera or the camera in a cell phone: It captures light emitted from or reflected by an object and converts it into electrical signals that are used to produce a digital image. But the LSST Camera focal plane is much more sophisticated. In fact, it contains 189 individual sensors, or charge-coupled devices (CCDs), that each bring 16 megapixels to the table – about the same number as the imaging sensors of most modern digital cameras.  

    Sets of nine CCDs and their supporting electronics were assembled into square units, called “science rafts,” at DOE’s Brookhaven National Laboratory and shipped to SLAC. There, the camera team inserted 21 of them, plus an additional four specialty rafts not used for imaging, into a grid that holds them in place. 

    The focal plane has some truly extraordinary properties. Not only does it contain a whopping 3.2 billion pixels, but its pixels are also very small – about 10 microns wide – and the focal plane itself is extremely flat, varying by no more than a tenth of the width of a human hair. This allows the camera to produce sharp images in very high resolution. At more than 2 feet wide, the focal plane is enormous compared to the 1.4-inch-wide imaging sensor of a full-frame consumer camera and large enough to capture a portion of the sky about the size of 40 full moons. Finally, the whole telescope is designed in such a way that the imaging sensors will be able to spot objects 100 million times dimmer than those visible to the naked eye – a sensitivity that would let you see a candle from thousands of miles away. 

    “These specifications are just astounding,” said Steven Ritz, project scientist for the LSST Camera at the University of California, Santa Cruz. “These unique features will enable the Rubin Observatory’s ambitious science program.” 

    Over 10 years, the camera will collect images of about 20 billion galaxies. “These data will improve our knowledge of how galaxies have evolved over time and will let us test our models of dark matter and dark energy more deeply and precisely than ever,” Ritz said. “The observatory will be a wonderful facility for a broad range of science – from detailed studies of our solar system to studies of faraway objects toward the edge of the visible universe.” 

    A high-stakes assembly process 

    The completion of the focal plane earlier this year concluded six nerve-wracking months for the SLAC crew that inserted the 25 rafts into their narrow slots in the grid. To maximize the imaging area, the gaps between sensors on neighboring rafts are less than five human hairs wide. Since the imaging sensors easily crack if they touch each other, this made the whole operation very tricky. 

    The rafts are also costly – up to $3 million apiece. 

    SLAC mechanical engineer Hannah Pollek, who worked at the front line of sensor integration, said, “The combination of high stakes and tight tolerances made this project very challenging. But with a versatile team we pretty much nailed it.” 

    The team members spent a year preparing for the raft installation by installing numerous “practice” rafts that did not go into the final focal plane. That allowed them to perfect the procedure of pulling each of the 2-foot-tall, 20-pound rafts into the grid using a specialized gantry developed by SLAC’s Travis Lange, lead mechanical engineer on the raft installation.   

    Tim Bond, head of the LSST Camera Integration and Test team at SLAC, said, “The sheer size of the individual camera components is impressive, and so are the sizes of the teams working on them. It took a well-choreographed team to complete the focal plane assembly, and absolutely everyone working on it rose to the challenge.” 

    Taking the first 3,200-megapixel images 

    The focal plane has been placed inside a cryostat, where the sensors are cooled down to negative 150 degrees Fahrenheit, their required operating temperature. After several months without lab access due to the coronavirus pandemic, the camera team resumed its work in May with limited capacity and following strict social distancing requirements. Extensive tests are now underway to make sure the focal plane meets the technical requirements needed to support Rubin Observatory’s science program.  

    Taking the first 3,200-megapixel images of a variety of objects, including a Romanesco that was chosen for its very detailed surface structure, was one of these tests. To do so without a fully assembled camera, the SLAC team used a 150-micron pinhole to project images onto the focal plane. These photos, which can be explored in full resolution online (links at the bottom of the release), show the extraordinary detail captured by the imaging sensors. 

    “Taking these images is a major accomplishment,” said SLAC’s Aaron Roodman, the scientist responsible for the assembly and testing of the LSST Camera. “With the tight specifications we really pushed the limits of what’s possible to take advantage of every square millimeter of the focal plane and maximize the science we can do with it.”  

    Camera team on the home stretch 

    More challenging work lies ahead as the team completes the camera assembly.  

    In the next few months, they will insert the cryostat with the focal plane into the camera body and add the camera’s lenses, including the world’s largest optical lens, a shutter and a filter exchange system for studies of the night sky in different colors. By mid-2021, the SUV-sized camera will be ready for final testing before it begins its journey to Chile. 

    “Nearing completion of the camera is very exciting, and we’re proud of playing such a central role in building this key component of Rubin Observatory,” said JoAnne Hewett, SLAC’s chief research officer and associate lab director for fundamental physics. “It’s a milestone that brings us a big step closer to exploring fundamental questions about the universe in ways we haven’t been able to before.” 

    Click on the links below to explore images taken with the focal plane of the LSST Camera in full resolution. Press the “+/-” buttons at top left in the web viewer to zoom in and out of the images.

     

    https://www.slac.stanford.edu/~tonyj/osd/public/romanesco.html 

    Head of Romanesco 

     

    https://www.slac.stanford.edu/~tonyj/osd/public/flammarion-2.html 

    Photo of the Flammarion engraving 

     

    https://www.slac.stanford.edu/~tonyj/osd/public/vera_rubin-2.html 

    Photo of Vera Rubin, courtesy of the Carnegie Institution for Science, where Vera Rubin spent her career as a staff scientist. 

     

    https://www.slac.stanford.edu/~tonyj/osd/public/group_photo-2.html 

    Collage of LSST Camera team photos 

     

    Web viewer: https://www.slac.stanford.edu/~tonyj/osd/public/logos-2.html 

    Collage of logos of institutions involved in the LSST Camera project 

     

    Construction of the LSST Camera is funded by DOE’s Office of Science and is a collaborative effort involving SLAC; Brookhaven National Laboratory; Lawrence Livermore National Laboratory; Harvard University; University of Pennsylvania; Purdue University; University of California, Davis; and the French National Institute of Nuclear and Particle Physics (IN2P3). 

    SLAC is a vibrant multiprogram laboratory that explores how the universe works at the biggest, smallest and fastest scales and invents powerful tools used by scientists around the globe. With research spanning particle physics, astrophysics and cosmology, materials, chemistry, bio- and energy sciences and scientific computing, we help solve real-world problems and advance the interests of the nation. 

    Vera C. Rubin Observatory is a federal project jointly funded by the National Science Foundation and the Department of Energy Office of Science, with early construction funding received from private donations through the LSST Corporation. The NSF-funded LSST (now Rubin Observatory) Project Office for construction was established as an operating center under the management of the Association of Universities for Research in Astronomy (AURA). The DOE-funded effort to build the Rubin Observatory LSST Camera (LSSTCam) is managed by SLAC. 

    SLAC is operated by Stanford University for the U.S. Department of Energy’s Office of Science. The Office of Science is the single largest supporter of basic research in the physical sciences in the United States and is working to address some of the most pressing challenges of our time. 

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