|About this Abstract
||MS&T21: Materials Science & Technology
||Advanced Characterization of Materials for Nuclear, Radiation, and Extreme Environments
||Development of In-situ Atomic Scale Defect Spectroscopy during Ion Irradiation
||Farida Selim, A Jones, Y Wang, S Agarwal, H Kim, P Hosemann, B Uberuaga
|On-Site Speaker (Planned)
Development of in-situ positron capability such as in-situ TEM capability would provide a unique tool to monitor material response under extreme conditions. Positron is the only probe that detects atomic-size vacancies induced by irradiation with remarkable sensitivity and in-situ positron annihilation spectroscopy(PAS) can monitor formation of single vacancies and their evolution to voids revealing new radiation damage mechanisms.
An in-situ positron beam during irradiation is being developed at the Ion Beam Materials Laboratory at the Los Alamos National Laboratory. Three beams are converging onto the target, an ion beam to create displacement damage and helium beam to simulate gas formation and positron beam to monitor in real time defect formation from individual cascades and their build up to large clusters and voids after cascade overlapping. In this talk I will describe the beam development, challenges, advantages, and limitations. Examples of PAS measurements will be presented to demonstrate the unique capabilities.