We're wrapping up the first Bay Area Light Sources Users' Meeting of all three local light sources!
SLAC's Linac Coherent Light Source & Stanford Synchrotron Radiation Lightsource, and @BerkeleyLab's @advlightsource thank you for coming to SLAC!
ALT A large group of people gathers outdoors on a grassy area with trees and a modern building in the background. The group is smiling and waving towards the camera, creating a joyful atmosphere on a sunny day. Credit: Alan Fry/SLAC
Welcome to Chile, @SLACLab LSST Camera team colleagues!
They arrived from California last week for scheduled camera work during NSF–DOE Rubin Observatory’s planned engineering downtime. This engineering period will last about three weeks in total.
ALT A "selfie" from two workers wearing helmets and safety vests using Rubin's primary mirror. They're standing on a metal platform with metal structural beams reflected behind them.
ALT Five workers wearing safety gear inside Rubin's dome next to a curved concrete wall.
ALT A person in red safety gear and yellow helmet laying on a platform while working on Rubin's giant digital camera.
ALT Two people working on computers in an office with safety hard hats and high-visibility vests nearby.
Why do we have XFELs?
Quantum computing, fusion energy, & so much more. The world’s most powerful X-ray laser is here at SLAC and is getting upgraded. When complete, it will allow scientists to explore atomic-scale processes with unprecedented precision.
What can an XFEL do?
An X-ray free-electron laser can capture interactions between molecules that are crucial to life’s processes, which can help with research on diseases or aid in drug design, as well as help us understand processes like photosynthesis.
Light sources unite!
We’re kicking off the first-ever meeting for all three Bay Area light sources – SLAC’s Linac Coherent Light Source, our Stanford Synchrotron Radiation Lightsource and @BerkeleyLab's @advlightsource – here this week!
ALT A modern building with large windows and a red roof features a banner in front of it. The banner reads "Bay Area Light Sources Joint Users' Meeting, 20-25 September, 2026, A First-Ever Collaboration," and includes logos for Advanced Light Source, LCLS, and SSRL. An American flag is visible nearby. Credit: Lara Streiff/SLAC
It’s International Observe the Moon Night!
While @VRubinObs doesn’t directly observe the Moon, #DYK the focal plane of our LSST Camera (the world’s largest digital camera!) has 3.5-degree field of view? Aka about 7 full moons across and about 45 full moons in area.
ALT A series of seven full moons aligned horizontally against a backdrop of a starry night sky filled with distant galaxies and stars in the shape of the focal plane of the NSF-DOE Vera C. Rubin Observatory. Credit: NSF–DOE Rubin Observatory/NOIRLab/SLAC/AURA
We ♥️ our community ☀️
Our annual Community Day took place last weekend!
Interactive exhibits, engaging demos, and group tours showcased some of the amazing science happening at SLAC.
ALT A group of people gather around a science exhibit outdoors under a tent. One person is operating scientific equipment, while others, including children, watch with interest. Some individuals are holding balloons, and there is a festive atmosphere. Credit: Jacqueline Ramseyer Orrell/SLAC
ALT A group of people are interacting with a plasma globe at SLAC Community Day 2026. Children are touching the globe, observing the colorful electric arcs. In the background, attendees, including some wearing Stanford shirts, are engaging with various exhibits. Credit: Jacqueline Ramseyer Orrell/SLAC
ALT A person touching a Van de Graaff generator outdoors, causing hair to stand on end. Two others stand nearby, smiling and reacting with amusement. Trees and a building are visible in the background. Credit: Jacqueline Ramseyer Orrell/SLAC
ALT A person wearing a virtual reality headset extends their arms as if interacting with a virtual environment. Behind them is a display with a sign that reads "Cryo-EM Center, S²C²." The room contains informational posters and tables with scientific models. Credit: Jacqueline Ramseyer Orrell/SLAC
“This is something we haven't seen before in nature” - Rachael Kretsch @stanford. Using tools @SLACLab, she led a team that discovered beautiful complexes of RNA that didn’t have any proteins to support them. The work is giving new insights into RNA: slac.stanford.edu/news/2025-…
ALT Three diagrams of RNA molecules, which look like multicolored balls of tangled curled ribbon
How does an X-ray Free-Electron Laser work?
Our underground electron accelerator gets electrons moving so fast (99.9% the speed of light) and they can release ultra bright X-ray light used for scientific experiments!
And our X-ray laser is the most powerful of its kind.
A new view of a familiar field 🤩
Meet NSF–DOE Rubin Observatory's breathtaking view of the renowned COSMOS field🌀✨
rubinobservatory.org/news/ru…
🧵
ALT A dense field of countless pinpoint stars fills the frame against the deep black of space, creating a fine, grainy texture like fine sand spread across a smooth table. Dozens of particularly bright stars in blue, yellow, and orange glitter across the scene like jewels.
Wispy, grayish clouds of galactic dust drift across the center and right sides of the image, appearing soft and powder-like against the dark background.
Scattered throughout the entire scene are stars and faint objects in shades of blue, yellow, and red. Some appear as sharp, solid points, while others are soft, diffuse smudges. Zooming in reveals that many of these tiny, faint smudges scattered between the stars are actually distant galaxies, varying from smooth, pebble-like blobs to faint, stretched lines.
Just a piece of NSF–DOE Rubin Observatory's Ocean of Stars 🌊✨
This galaxy is MCG-06-33-009, and the blue knots in its spiral arms show where hot, young stars are forming.
Rubin will capture billions of galaxies and enable scientists to study how galaxies grow and change 🌀
ALT Golden spiral galaxy with blueish spiral arms in a dense star field. Numerous orange and blue stars dot the dark sky, with a bright bluish star left of center and faint background galaxies scattered throughout.
ALT A wide, panoramic view of a dense field of pinpoint stars filling the entire frame like fine dust. A white square notes a specific galaxy near upper center. Wispy, grayish-brown clouds of galactic cirrus drift across the scene, creating a subtle, patchy texture over the dark background. Several brighter stars stand out, most notably a large, brilliant blue star on the upper right surrounded by a soft glowing halo, along with a few other scattered bright blue and warm orange stars.
What is an XFEL? Do you know?
Not unlike a camera, an X-ray free-electron laser (XFEL) helps us capture movies, but at the tiny and ultrafast scale of atoms and molecules! SLAC is home to the world’s first hard X-ray XFEL, our Linac Coherent Light Source.
Magnets can dim a worm's glow 🧲 🪱
SLAC and @Stanford researchers have proven that static magnets and radio frequencies can be used to control the red fluorescence of genetically modified C. elegens worms!
ALT An artistic representation showing radio frequency waves and magnets interacting with fluorescent red worms. Credit: Greg Stewart/SLAC
This experiment was the first to demonstrate in live animals how the presence of a static magnet dimmed the fluorescent red glow of the worms, while the introduction of radio-frequencies increased it.
SLAC researchers helped to build and test the LUX-ZEPLIN detector, and continue to contribute to operations and analysis of its growing datasets. #ICYMI, the experiement recently observed something unexpected - the most compelling hint of dark matter it has reported to date!
The @ENERGY Office of Science's facilities make our world-leading scientific research possible.
Join a virtual town hall on Sept. 17 to give input on the future of these facilities: web.cvent.com/event/581984eb…
ALT A map of the Dept. of Energy Office of Science National Laboratories
Dedicated.
#OTD in 1967, five years after construction began, was SLAC’s dedication day. Our linear particle accelerator – first dubbed Project M aka "the Monster" – celebrated the official opening of the massive two-mile-long linear accelerator
ALT From left, Atomic Energy Commission Director Glenn Seaborg, SLAC Director Pief Panofsky, Stanford University President J. E. Wallace Sterling, U.S. Presidential Science Advisor Don Horning and Edward L. Ginzton, former Professor of Applied Physics at Stanford University and the Director of Project M.
ALT Aerial view of SLAC Linear Accelerator Lab in California. Sparse trees and open land are visible.
What even happened last month?
New updates in the search for dark matter, ultrafast electrons & lasers open possibilities for imaging, squeezing batteries keeps them from short-circuiting, & an AI neural network!
The latest Signals newsletter: bit.ly/4cvR14P
ALT The image shows a scientific laboratory with a large cylindrical instrument known as the LUX-ZEPLIN experiment. The surrounding area contains various scientific equipment, cables, and metal surfaces. Bright lighting illuminates the scene. Credit: Matthew Kapust/Sanford Underground Research Laboratory
ALT Abstract scientific illustration depicting a luminous energy beam directed towards a square, textured surface with glowing, intricate patterns. The background features spherical formations, suggesting a theme of energy or particle interaction. Credit: Greg Stewart/SLAC
ALT A round shape with tree‑like pattern spreading outward from a dark central area, set against a blurred blue background. Researchers discovered a way to track and suppress harmful intrusions in dendrites that form in solid-state batteries. This top view of the electrolyte shows the dendrites that propagated horizontally. (Greg Stewart, SLAC National Accelerator Laboratory)
ALT A complex infographic shows a cube with a circular pattern on the left, connected by dotted lines to a central geometric shape. On the right, there are two labeled sections. The top section, "Arbitrary Resolution," displays a series of images transitioning from low to high resolution. The bottom section, "Different Scales," shows images ranging from coarse to fine detail. The color scheme is primarily purple and orange on a dark background.
The AI-based method uses neural networks to reduce the overall file size while allowing users to control what information is kept. The neural network encodes features of the measurement at different scales in a compact form. At decoding, users can select a small region of interest to decode, and this can be done at different scales and resolutions, allowing finer features to be recovered when needed. (Credit: Yuan Ni and Greg Stewart/SLAC National Laboratory)
Just a normal camera, if “normal” means:
🔭 A 3.2-billion-pixel sensor
🌌 A field of view that could fit ~45 full Moons
⏱️ A new 8-gigabyte image every ~40 seconds
NSF–DOE Rubin Observatory's LSST Camera is the largest ever built (thanks @SLAClab!)
Ok, maybe that's not normal.
ALT Technician in cleanroom suit inspecting a large, cylindrical camera barrel inside a clean room.
ALT Close-up of a Romanesco broccoli head showing its intricate fractal pattern in black and white. The mosaic grid of LSST Camera's ~200 individual CCDs is visible as vertical and horizontal black lines.
ALT Workers in safety gear guide the car-sized LSST Camera suspended by green straps inside Rubin's large maintenance hall.
ALT Close-up view of the huge LSST Camera installed at the center of Rubin's 8.4-meter telescope, with metal scaffolding on either side.
SLAC and @Stanford researchers measured heat dissipation in liquid crystals – a collection of interacting components similar to those of a computer – as a first step toward more energy efficient computing & data centers and chips that run cooler by design: stanford.io/467YseY