FACET-II (IMAGE) DOE/SLAC National Accelerator Laboratory Caption FACET-II is the only facility in the world capable of providing high-energy electron and positron beams for researching a vast array of revolutionary accelerator technologies that could shrink future accelerators by factors of 100 to 1,000 and sharpen their capabilities. Credit Greg Stewart/SLAC National Accelerator Laboratory Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.