NSTX-U Center Stack and H-node Plasma (IMAGE) DOE/Princeton Plasma Physics Laboratory Caption This is a NSTX-U H-mode plasma. Credit NSTX-U Team 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.