Fusion -- Blocking the Heat (IMAGE) DOE/Oak Ridge National Laboratory Caption A novel technique can help protect the innermost wall in a fusion reactor from the energy created when hydrogen isotopes are heated to temperatures hotter than the sun. Credit General Atomics 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.