iTOP and Belle II (IMAGE) DOE/Pacific Northwest National Laboratory Caption Scientists and technicians insert one of the optical components of the iTOP detector into the Belle II detector. The Belle II detector weighs about 1,400 tons and is approximately 26 feet high, wide and deep. The detector will catch the action when positrons and electrons collide in the SuperKEKB accelerator. Credit Photo courtesy of James Fast/PNNL Usage Restrictions With credit: Photo courtesy of James Fast/PNNL 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.