Gerrit Kramer (IMAGE) DOE/Princeton Plasma Physics Laboratory Caption PPPL physicist Gerrit Kramer with conceptual image of SPARC fusion reactor. Credit Collage and Kramer photo by Elle Starkman/PPPL Office of Communications. SPARC image courtesy of Commonwealth Fusion Systems. 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.