COSY Accelerator (image) Forschungszentrum Juelich Caption The Jülich accelerator COSY (cooler synchrotron) with a circumference of around 180 meters provides high-precision beams of spin-polarized protons and deuterons for experiments. Credit Source: Forschungszentrum Jülich Usage Restrictions Please use only in conjunction with reports related to Forschungszentrum Jülich. Please give credit. 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.