About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Transmutation Effects in Fusion Reactor Materials: Critical Challenges & Path Forward
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Presentation Title |
Ultrafast Measurement of Microscopic Energy Flow in He-implanted W |
Author(s) |
Mianzhen Mo, Artur Tamm, Zhijiang Chen, Erki Metsanurk, Ling Wang, Yongqiang Wang, Mungo Frost, Nicholas Hartley, Fuhao Ji, Samuel Murphy, Silvia Pandolfi, Peihao Sun, Xiaozhe Shen, Correa Alfredo, Siegfried Glenzer |
On-Site Speaker (Planned) |
Mianzhen Mo |
Abstract Scope |
Tungsten (W) is a plasma-facing material for ITER and will be subject to radiation damage under reactor operating conditions. Among many others, He-induced damage is one of the severe issues and can change drastically the material properties. To understand the materials degradation of W from He effect, we employed the technique of ultrafast electron diffuse scattering to directly measure the electron-phonon and phonon-phonon dynamics in He-implanted W. These couplings play a determining role in properties including electrical and thermal conductivity. From the time-resolved diffuse scattering measurement, we obtained momentum-dependent information on electron-phonon and phonon-phonon interactions at femtosecond temporal resolutions. The experimental results show a clear signature of non-equilibrium phonon dynamics in pristine W, with faster energy transferred from laser-excited electrons to higher-energy phonons. The results further show that the implantation of He ions considerably changes the phonon-phonon coupling process and hence the microscopic energy flow in W. |
Proceedings Inclusion? |
Planned: |
Keywords |
Nuclear Materials, Environmental Effects, High-Temperature Materials |