Nuclear Materials and Energy (IMAGE) DOE/US Department of Energy Caption Simulation results showing tungsten density at the interface of the plasma’s edge and core for both magnetic field directions. Fast flows that often occur in the clockwise magnetic field direction reduce the accumulation of tungsten impurities. Credit Image courtesy of Shawn Zamperini, UT-Knoxville. Usage Restrictions Image courtesy of Shawn Zamperini, UT-Knoxville. 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.