Rebecca Masline, Ph.D., is a researcher at the Plasma Science and Fusion Center at the Massachusetts Institute of Technology. She completed her Ph.D. at University of California San Diego in 2023. She took third place in the ORISE Postdoc Poster Session Showcase in 2024 for her poster on helium ash in the exhaust streams created by nuclear fusion. In this conversation, Masline explains that when atoms combine to make fusion happen, we get energy, which we like, but we also get one ash of helium as a byproduct. Masline’s research focuses on characterizing and understanding the behavior of helium in the exhaust stream of these nuclear fusion devices and investigate whether we can use that to characterize efficiency of a fusion power plant as a whole. She also talks about her mentors and what drives her as a scientist. To learn more about Masline and her research, visit https://orise.orau.gov/people/success-stories/2025/rebecca-masline.html