Tokamak (IMAGE) Princeton University, Engineering School Caption Depiction of a tokamak. Credit Illustration by Bumper DeJesus, Andlinger Center for Energy and the Environment. Usage Restrictions Noncommercial use only. 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.