Inside Berkeley Lab’s Advanced Light Source Upgrade

The Advanced Light Source at Lawrence Berkeley National Laboratory generates intense light beams for atomic-level material and molecular analysis. A current upgrade will enhance its capabilities by increasing brightness and introducing coherence, a property that improves resolution in detecting atomic-scale irregularities in materials like batteries and quantum substances. The upgrade aims to accelerate scientific discovery across multiple disciplines by providing sharper, more detailed insights. Researchers will use the upgraded light source to examine samples with greater precision, revealing chemical and electronic properties that were previously difficult to observe.

At the ALS, scientists study samples using a spectrum of light beyond human vision, including infrared, ultraviolet, and X-rays. Unlike conventional X-rays that produce simple silhouettes, the ALS uses multiple X-ray wavelengths to generate detailed images of a sample’s chemical and electronic structure. The current light source lacks coherence, meaning its light waves are out of phase, which can obscure true sample characteristics by mixing disorder from both the light and the material. The upgrade replaces existing equipment with more compact magnets arranged to produce coherent light, ensuring aligned wave peaks and troughs for clearer measurements.

Coherent light will allow researchers to detect subtle anomalies in samples that were previously indistinguishable. Without coherence, data appears as a blurred average, masking fine details. With coherence, each interaction with the sample produces distinct speckles, akin to a chemical fingerprint, revealing intricate structural information. This advancement will enable scientists to identify irregularities in materials like superconductors, where even minor defects can determine functionality, and to design more efficient energy storage and microelectronic systems.

The upgraded ALS, set to deliver 100 times brighter and nearly fully coherent soft X-ray light, will expand research possibilities in quantum materials, battery technologies, and microelectronics. By providing a new level of detail, the facility will help scientists uncover atomic-scale phenomena that were previously inaccessible, fostering breakthroughs in materials science and related fields.