CPA-4 APS Upgrade Optics 33028D2 (IMAGE) DOE/Argonne National Laboratory Caption Jun Qian, metrology engineer in the APS Optics Group at Argonne, observes his reflection in one of the highly polished mirrors for the APS Upgrade. These mirrors will focus the powerful APS X-ray beams to incredibly small sizes. Credit (Image by J.J. Starr/Argonne National Laboratory.) Usage Restrictions Original content License Original 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.