RSS feed source: National Science Foundation

A new study supported by the U.S. National Science Foundation shows, for the first time, how heat moves — or rather, doesn’t — between materials in a high-energy-density plasma state. The work is expected to provide a better understanding of inertial confinement fusion experiments, which aim to reliably achieve fusion ignition on Earth using lasers. How heat flows between a hot plasma and a material’s surface is also important in other technologies, including semiconductor etching and vehicles that fly at hypersonic speeds.

High-energy-density plasmas are produced only at extreme pressures and temperatures. The study shows that interfacial thermal resistance, a phenomenon known to impede heat transfer in less extreme conditions, also prevents heat flow between different materials in a dense, super-hot plasma state. The research is published in Nature Communications and was led by Thomas White, a physicist at the University of Nevada, Reno, and his former doctoral student, Cameron Allen. White is a recipient of an NSF Faculty Early Career Development grant.

“Understanding how energy flows across a boundary is a fundamental question, and this work provides us with new insights into how this happens in the exceptionally energy-dense environments that one finds inside of stars and planetary cores,” says Jeremiah Williams, a program director for the NSF Plasma Physics program.

RSS feed source: National Science Foundation

“Today, I am announcing my decision to step down as Director of the U.S. National Science Foundation (NSF), effective today. It has been an honor and privilege to serve as the Director of NSF for the last five years. I believe I have done all I can to advance the critical mission of the agency and feel that it is time for me to pass the baton to new leadership.

I came to NSF inspired by its mission, with a desire to serve the scientific community alongside the exceptional people of the agency. This has motivated me every day over the last five years. I have always believed that innovation and opportunities must be unleashed everywhere at speed and scale, thereby nurturing talent in every corner of our great nation. This will ensure we remain competitive and innovative on a global scale.

This is a pivotal moment for our nation in terms of global competitiveness. NSF is an extremely important investment to make U.S. scientific dominance a reality. We must not lose our competitive edge.

I am deeply grateful to both Presidents for the opportunity to serve our nation. I am also thankful for the strong bipartisan support of Congress and the tireless efforts of the amazing staff at NSF. I wish the very best for the agency and will always look proudly at the

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