APEX-D Electron-Positron Plasma Trap (IMAGE) Max-Planck-Institut für Plasmaphysik (IPP) Caption Design of the APEX-D electron-positron plasma trap. A circular, superconducting magnet coil (red) is producing the dipole field inside a vacuum vessel. This coil is levitated by a ring-shaped conductor (pink) which is installed above the vessel. It attracts the coil feedback-controlled. Credit Graphic: IPP 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.