2026-09-20T16:39:56Zhttps://dspace.mit.edu/server/oai/requestoai:dspace.mit.edu:1721.1/1089662026-06-16T18:53:21Zcom_1721.1_7582com_1721.1_7581col_1721.1_131022
Michael J. Demkowicz.
Yuryev, Dina V
Massachusetts Institute of Technology. Department of Materials Science and Engineering.
Massachusetts Institute of Technology. Department of Materials Science and Engineering
2017-05-11T19:58:15Z
2017-05-11T19:58:15Z
2017
2017
http://hdl.handle.net/1721.1/108966
986491819
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 2017.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 117-125).
In order for nuclear fusion to be a feasible source of energy, materials must be developed that are resistant to the damaging byproducts of a fusion reaction. One of these byproducts is He, that is implanted into the plasma facing wall of the reactor. Once implanted, it causes irreparable damage due to it's insolubility in the material: the He cannot escape in a non-destructive manner. In this thesis, an interface in a layered metal nanocomposite is designed to have desirable precipitation properties, specifically that He precipitates will link up to form stable, continuous pathways. Once in these channels, the He may still migrate within the channels themselves. Thus, channels that terminate at free surfaces may enable controlled He removal via outgassing, thereby averting He-induced damage. In this thesis, computational methods are developed for identifying promising interfaces that give rise to He channels and for modeling He network behaviors at these interfaces. These models are then applied to materials systems of interest to determine if elongated precipitates arise. Finally, experimental results are presented that support computational predictions that Cu-V interfaces result in linear helium channels.
by Dina V. Yuryev.
Ph.D.
125 pages
eng
Massachusetts Institute of Technology
MIT theses are protected by copyright. They may be viewed, downloaded, or printed from this source but further reproduction or distribution in any format is prohibited without written permission.
http://dspace.mit.edu/handle/1721.1/7582
Materials Science and Engineering.
Computational design of interfaces : mitigating He damage in nuclear fusion applications
Mitigating Helium damage in nuclear fusion applications
Thesis
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<Abstract>In order for nuclear fusion to be a feasible source of energy, materials must be developed that are resistant to the damaging byproducts of a fusion reaction. One of these byproducts is He, that is implanted into the plasma facing wall of the reactor. Once implanted, it causes irreparable damage due to it's insolubility in the material: the He cannot escape in a non-destructive manner. In this thesis, an interface in a layered metal nanocomposite is designed to have desirable precipitation properties, specifically that He precipitates will link up to form stable, continuous pathways. Once in these channels, the He may still migrate within the channels themselves. Thus, channels that terminate at free surfaces may enable controlled He removal via outgassing, thereby averting He-induced damage. In this thesis, computational methods are developed for identifying promising interfaces that give rise to He channels and for modeling He network behaviors at these interfaces. These models are then applied to materials systems of interest to determine if elongated precipitates arise. Finally, experimental results are presented that support computational predictions that Cu-V interfaces result in linear helium channels.</Abstract>
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