Princeton Plasma Physics Laboratory (PPPL) | 24,294 followers on LinkedIn. The Princeton Plasma Physics Laboratory is a U.S. Dept. of Energy national laboratory managed by Princeton University | A proud U.S. Department of Energy National Laboratory managed by Princeton University, the Princeton Plasma Physics Laboratory (PPPL) is a longstanding leader in the science and engineering behind the development of fusion energy — a clean, safe, and virtually limitless energy source. With an eye on the future and in response to national priorities, PPPL also has begun a strategic shift from a singular focus on fusion energy to a multi-focus approach that includes microelectronics, quantum information science, and sustainability science.