After years of development and an investment of over 1.1 billion dollars, the world’s most powerful X-ray laser is now operational, marking a monumental leap in our ability to observe atomic-scale objects.
Operated by the SLAC National Accelerator Laboratory under the United States Department of Energy, this groundbreaking X-ray laser emits an astonishing one million bursts per second— a remarkable increase compared to its predecessor, which managed just 120 bursts per second. What’s more, each of these laser bursts is up to 10,000 times brighter, promising a new era of scientific discovery.
LCLS-II XFEL: the most powerful X-ray laser
The LCLS-II XFEL (X-ray Free Electron Laser) is this extraordinary machine’s name, and it operates by chilling electrons to temperatures colder than deep space and then propelling them to nearly the speed of light. This is the upgraded version of an instrument designed to capture high-resolution images of microscopic objects at ultrafast timescales.
X-ray free electron lasers, like LCLS-II, produce ultra-bright and ultra-short pulses of X-ray light, enabling scientists to observe the behavior of molecules, atoms, and electrons with unprecedented precision on the natural timescales of chemical reactions, biological processes, and materials transformations. The previous iteration of this technology allowed researchers to image viruses, replicate conditions at a star’s core, generate states hotter than the Earth’s core, create deafening sounds, and mimic the type of “diamond rain” that could occur on planets like Neptune.
LCLS-II operates on the same fundamental principles as its predecessor but with several notable upgrades. The most significant improvement is the cooling system, which relies on an array of 37 cryomodules to lower the equipment’s temperature to -271°C, just above Absolute Zero (-273.15°C). Liquid helium coolant circulates through these modules from two large helium cryoplants. At such frigid temperatures, the niobium metal cavities inside the modules become superconducting, allowing electrons to flow through them without any resistance.
What uses does it have?
The applications of this X-ray laser are diverse and far-reaching. It can record real-time movies of chemical reactions, such as photosynthesis, and aid in analyzing the structures of complex molecules. Additionally, it can contribute to the development of quantum computers.
US Secretary of Energy Jennifer Granholm lauded this achievement, stating that the light from SLAC’s LCLS-II will illuminate the smallest and fastest phenomena in the universe, leading to significant discoveries across various fields, from human health to quantum materials science. This upgrade ensures that the United States remains at the forefront of X-ray science, offering insights into the atomic-level workings of our world.
In summary, the activation of the LCLS-II XFEL heralds a new era of scientific exploration and knowledge acquisition, thanks to its unparalleled capabilities in capturing the tiniest and most fleeting aspects of our universe.